CN113912319B - Solid waste plastic water repellent agent for recycling red mud or saponification slag and water-resistant building material - Google Patents
Solid waste plastic water repellent agent for recycling red mud or saponification slag and water-resistant building material Download PDFInfo
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- CN113912319B CN113912319B CN202111433794.7A CN202111433794A CN113912319B CN 113912319 B CN113912319 B CN 113912319B CN 202111433794 A CN202111433794 A CN 202111433794A CN 113912319 B CN113912319 B CN 113912319B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a solid waste plastic type water repellent agent for recycling red mud or saponification slag and a water-resistant building material. The material is used for the resource treatment of red mud or saponification slag and other solid wastes, has good water resistance and environmental friendliness, and is economical and environment-friendly. The solid waste plastic water repellent agent is prepared from the following components in percentage by mass: 10-35% of sulfonated oil; 0.5-5% of graphene oxide; 8-35% of polyol; 0.2-1.2% of sodium carboxymethylcellulose; the balance being water.
Description
The technical field is as follows:
the invention provides a solid waste plastic water-resistant agent for recycling red mud or saponification slag and a water-resistant building material using the solid waste plastic water-resistant agent, belonging to the technical field of solid waste resource treatment.
Background art:
the red mud is industrial solid waste generated in the process of producing alumina by using bauxite, and is called red mud because the red mud contains a large amount of iron oxide, is red in color and is shaped like soil. Bauxite mainly comprises oxides such as alumina, silicon dioxide, ferric oxide, titanium dioxide and the like, and the total mass percentage of the oxides is more than 95%. In addition to this, the composition also contains: oxides of sulfur and carbon, and oxides of alkali and alkaline earth metals calcium, magnesium, sodium, potassium. Bauxite often contains trace amounts of compounds of Ga, Ge, Nb, Ta, Co, Zr, V, P, Cr, Ni. Lime milk and sodium carbonate are added in the process of extracting alumina by a Bayer process, so that the red mud comprises the following main chemical components: calcium carbonate, calcium hydroxide, sodium hydroxide, aluminum hydroxide, iron oxide, silica, titanium dioxide, etc., small amounts of hydroxides of magnesium, sodium, potassium, and trace amounts of compounds of Ga, Ge, Nb, Ta, Co, Zr, V, P, Cr, Ni.
2 hundred million tons of red mud are generated in China every year, a large amount of land is occupied for accumulation, and the red mud is strong alkaline, so that the peripheral cuncao cannot grow. The red mud contains a large amount of soluble and strong alkaline substances such as sodium hydroxide, potassium hydroxide, calcium hydroxide and the like, and the red mud permeates into underground water along with precipitation or enters surface water systems along with surface runoff, thereby causing great harm to the ecology. The domestic stock of red mud is over 10 hundred million tons of solid waste, so related departments list the red mud at the first place of bulk solid waste.
The saponification slag refers to the solid waste generated in the process of producing polyether by chlorohydrination method by using the production technology of Japan Asahi glass company. In the production process, chloropropanol reacts with slaked lime to prepare crude propylene oxide. The saponification waste liquid containing Ca, Si and Mg oxides is generated at the bottom of the tower, and solid waste saponification slag is formed through sedimentation and filter pressing. The saponification slag mainly comprises: calcium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, iron oxide, silicon dioxide and the like, so that the grass has strong alkalinity and cannot grow around. The saponified residues contain water-soluble strong alkali substances such as calcium hydroxide and the like, and the substances permeate into underground water along with rainfall or enter a surface water system along with surface runoff, so that great harm is caused to the ecology. Because the main components of the saponification slag and the red mud have similar properties, in practice, the saponification slag and the red mud are classified into one class and comprehensively utilized.
Currently, the comprehensive utilization technology of red mud comprises: 1. producing sintered wall materials by using red mud (Wanwenling. research on manufacturing sintered bricks by using industrial waste red mud [ J ]. brick and tile, 2006, (7): 42-43.); 2. producing a non-sintered wall material by using the red mud; research on the production of concrete by using red mud to partially replace cement (Liuchun, Yi nationality. sintering red mud, discussing [ J ] Chinese resource comprehensive utilization, 2007 (3): 17-19.); 3. the red mud and the fly ash are utilized to produce the baking-free brick (property research of the baking-free brick of red mud and fly ash [ J ] comprehensive utilization of the fly ash, 2007 (6): 38-39.). In the sintered wall material produced by using the red mud, the chemical composition of the red mud has larger difference with the requirements of the raw materials of the sintered wall material, so the mechanical property of the sintered wall material is reduced. In the research of replacing cement with red mud, the red mud can replace 15% of cement, the proportion of the red mud is increased, and the properties are greatly influenced. The baking-free brick produced by the red mud also has the problems of mechanical index and service life. Therefore, the research and development of green, low-energy-consumption and low-cost red mud recycling technology and the large-scale use of red mud as a raw material for developing new materials are effective ways.
At present, the saponified slag and the fly ash are mixed to be used as materials for a roadbed, but the problem of chloride ions in the saponified slag is to be solved, sodium chloride is lost along with water, so that the environmental problem and the material looseness are caused, and therefore, the water-curing-resistant soluble salt is the primary problem to be solved for recycling the saponified slag (Erythroculter 20319j, Yidong, Kingjun, Zhang Xingyue, Qingchen, Zhoulii, research on removing chlorides in the saponified slag, green technology, 2020,12, 213-215.).
At present, the firming agents with better effect in the field of soil solidification are EN-1 firming agent of American Banbang company, ISS2500 firming agent of south Africa and the like, the strong alkaline red mud or saponification slag can not be prepared into the water-resistant roadbed material by using the firming agents, the water absorption rate exceeds 15 percent, and the material can be scattered in water or the unconfined compressive strength is less than 1.2 MPa. Therefore, attempts have been made to develop a novel solid waste water-resistant plasticizer to improve the water-resistant effect and the unconfined pressure.
The invention content is as follows:
the invention aims to provide a solid-waste plastic water repellent agent for recycling red mud or saponification slag, which is used for recycling solid wastes such as red mud or saponification slag.
The invention also aims to provide the water-resistant building material for recycling the red mud or the saponification slag, the material adopts the solid waste plastic water-resistant agent, and is mixed with the red mud mixed soil or the saponification slag mixed soil for use, and the material has the characteristics of good water resistance and environmental friendliness, and is economical and environment-friendly.
The specific technical scheme of the invention is as follows:
a solid waste plastic water repellent agent for recycling red mud or saponification slag is prepared from the following components in percentage by mass:
10-35% of sulfonated oil; 0.5-5% of graphene oxide; 8-35% of polyol; sodium carboxymethylcellulose 0.2
-1.2%; the balance being water.
The invention is further designed in that: the polyalcohol is one or a mixture of more of glycerol, ethylene glycol, pentaerythritol and triethanolamine.
The invention is further designed in that: the oxygen content of the graphene oxide is: 28 to 53 percent.
The preparation method of the solid waste plastic water repellent agent for recycling the red mud or the saponification slag comprises the following specific steps: and (3) mixing the sulfonated oil, the graphene oxide, the polyol, the sodium carboxymethylcellulose and the water, stirring at the temperature of 5-58 ℃ for 0.5-10 hours to obtain the waste plastic type water repellent agent. The stirring temperature is preferably room temperature.
A water-resistant building material for recycling red mud or saponification slag is prepared by mixing soil with the solid waste plastic water-resistant agent according to a mass ratio of 100: 0.01-1.0 percent by weight; the mixed soil is red mud mixed soil or saponification slag mixed soil, and the mass ratio of the red mud to the slag soil in the red mud mixed soil is 1: 0.5-2; the mass ratio of the saponification slag to the residue soil in the saponification slag mixed soil is 1: 0.5-2.
The invention is further designed in that the water-resistant building material is mainly a water-resistant roadbed material.
The invention further designs that the water-resistant roadbed material is specifically a roadbed water stabilizing layer material.
In the process of preparing the sample block piece, the mass ratio of the mixed soil prepared by adding a proper amount of muck into the red mud or the saponification slag to the solid waste plastic water repellent agent is as follows: the quality of the mixed soil is as follows: the mass of the solid waste plastic type water repellent agent is 1: 0.01-1.0, when the addition amount of the solid waste plastic water-resistant agent is less than 0.01 wt%, the mechanical property of the sample block piece is reduced, and when the addition amount of the solid waste plastic water-resistant agent is more than 1 wt%, the mechanical property of the sample block piece is not improved any more.
The stirring time for preparing the solid waste plastic water repellent agent is as follows: 0.5-10 hours, too long stirring time, no obvious improvement on the properties of the solid waste plastic water repellent, too short stirring time and uneven solid waste plastic water repellent. The stirring temperature is 5-58 ℃, the temperature is too high, the energy consumption is high, the large direction of energy conservation and environmental protection is not met, the temperature is too low, the reaction time is prolonged, and the room temperature is preferred.
Compared with the prior art, the invention has the following beneficial effects:
1. the solid waste plastic water repellent agent for recycling the red mud or the saponification slag has good water resistance, can avoid the overflow of water-soluble alkaline substances and the overflow of heavy metal ions in the recycling treatment of the red mud or the saponification slag, and has environmental friendliness.
2. In the research, the solid waste plastic type water repellent agent without adding the graphene oxide has the advantages of poor water repellent effect and no high confined compressive strength. After the graphene oxide (with the oxygen content of 28% -53%) is introduced, the water-resistant effect is good, and the unconfined pressure is greatly improved.
3. In the prior art, the curing agent is used together with lime and cement, so that alkaline substances in red mud or saponification slag cannot be effectively locked, calcium hydroxide and heavy metal ions are generated, and the overflow of the calcium hydroxide and the heavy metal ions generates environmental hidden troubles. The graphene oxide surface in the solid waste plastic water repellent agent has hydroxyl, carboxyl and epoxy groups, the oxygen-containing groups react with the oxygen-containing groups of polyhydric alcohol, sulfonated oil and sodium carboxymethylcellulose to generate ester and ether, a cage-shaped organic film is formed to wrap red mud-slag soil or saponification slag-slag soil particles, and the organic film has water resistance, so that the red mud-slag soil or saponification slag-slag soil particles are locked, and the material obtained by recycling solid waste has good water resistance. When in use, the water-soluble alkaline substances and heavy metal ions in the red mud or the saponification slag are prevented from overflowing.
4. The water-resistant building material for recycling the red mud or the saponification slag is prepared by mixing the mixed soil and the solid waste plastic water-resistant agent. The invention is suitable for treating solid wastes in large batch, and has the advantages of little addition of the curing agent, large usage amount of the roadbed material and good economic benefit when being used as the roadbed material. The invention replaces the water stabilizing layer material (the existing main components are sand, pebble and cement) of the highway with the new roadbed material prepared by uniformly stirring and compacting the solid waste plastic mold and the mixed soil, reduces the exploitation of the sand and the pebble, reduces the carbon emission of the fired cement, and meets the requirement of green environmental protection.
5. The water-resistant building material can be used as a water-resistant roadbed material, red mud or saponification slag is mixed with a solid waste plastic water-resistant agent, and the mixture is maintained for a period of time after construction to form a water-resistant, pressure-resistant, cleavage-resistant and shape-stable high-strength roadbed instead of a water-stable layer. As the water-resistant roadbed material is prepared without using auxiliary materials of lime and cement, the construction cost is saved by about 20 percent compared with the construction cost of the prior similar construction process (common curing agent is used together with lime and cement). Assuming that the cost of obtaining the red mud, the muck and the saponification slag is zero, the water-resistant material prepared by mixing the solid waste plastic water-resistant agent with the red mud-muck or the saponification slag-muck replaces a water stabilization layer, and the cost of the novel roadbed material is about 50 percent lower than that of the traditional water stabilization layer material. If certain treatment cost is charged for the red mud, the dregs and the saponification slag, the benefit is greater.
6. The water-resistant building material is prepared by mixing the solid waste plastic water-resistant agent and the mixed soil and pressing the mixture into a road base material or a building material, the mechanical property of the water-resistant building material meets the national standard, the components in the red mud, the saponification slag and the muck are sealed in a roadbed or the building material, the red mud and the saponification slag are changed into valuable, alkaline substances and heavy metal ions do not seep out, and the water-resistant building material meets the environmental protection requirement. The invention can reduce the use of river sand and cement, reduce energy consumption and construction cost, meet the requirement of carbon neutralization, and have wide market and bright prospect.
Description of the drawings:
FIG. 1 shows a water repellent agent for solid waste molding obtained in example 8;
FIG. 2 is a sample block formed by pressing solid waste plastic water repellent agent and red mud mixed soil in example 8;
and uniformly stirring the solid waste plastic water repellent agent and the mixed soil, and compacting and forming to prepare a sample block. The sample express mail is used for testing mechanical parameters after being maintained;
FIG. 3 is a pavement base layer laid by mixing the solid waste plastic water repellent agent of example 8 with red mud mixed soil as a roadbed material instead of a water stabilization layer;
fig. 4 is a road surface base layer laid by mixing the solid waste plastic water repellent agent of example 8 with saponification slag mixed soil as a road base material instead of a water stabilization layer.
The specific implementation mode is as follows:
the invention is further illustrated by the following specific examples:
the raw materials used in the examples of the invention are as follows:
1. the water is tap water, and the pH value is 6.9; content of heavy metal ions: iron (0.450 ppm); chromium (0.003 ppm); nickel (not detected);
2. the oxygen content of the graphene oxide is: 28% -53%;
3. the solid content of the sulfonated oil is 50 percent;
4. the red mud is obtained by preparing alumina by a Bayer process, and has the water content: 22.5 percent;
5. the saponification slag is solid waste generated in the process of producing polyether by using a chlorohydrination method by using the production technology of Japan Asahi glass company, and the water content is 23.4 percent;
6. the muck is general muck which needs to be treated after the building construction is built on Nanjing construction sites, and the water content is 10.8 percent.
Example 1.
Preparing a graphene oxide-free solid waste plastic water repellent agent, preparing an earthwork test piece by using the solid waste plastic water repellent agent, and testing the performances of the earthwork test piece:
1) mixing sulfonated oil (25g), polyalcohol (glycerol, 20g), sodium carboxymethylcellulose (1g) and water (54g) at 25 ℃, and stirring for 4 hours to obtain light yellow liquid, namely the graphene-free solid waste plastic water repellent;
2) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding 1g of the graphene-free solid waste plastic water repellent agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.68MPa and the water absorption of 17.4 percent.
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the graphene-free solid waste plastic water repellent agent (1g) obtained in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
The sample block was immersed in tap water for 1 day, and the unconfined compressive strength was 1.23MPa, and the water absorption was 20.6%.
The water absorption rate is too high, so that the method does not meet the requirements of roadbed engineering, and therefore, the method cannot be used for developing novel roadbed materials.
Example 2.
An earthwork test piece prepared by using a curing agent EN-1 (called as a road curing agent for short) of the United states of America Lubang and performance test:
1) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the above lubang curing agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the above lubang curing agent (1g) into the saponification slag mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain a sample block.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
Example 3.
An earthwork test piece prepared by using a curing agent EN-1 (called as a road curing agent for short) of the United states of America Lubang and performance test:
1) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; and (3) adding the above lubang curing agent (10g) into red mud mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.15MPa and the water absorption of 23.3 percent.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the above lubang curing agent (10g) into the saponification slag mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
Example 4.
An earthwork test piece prepared by using a curing agent EN-1 (called as a road curing agent for short) of the United states of America Lubang and performance test:
1) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; and adding 50g of the lubang curing agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.46MPa and the water absorption of 15.9 percent.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the above Nippon curing agent (50g) into the saponification slag mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.20MPa and the water absorption of 21.4%.
The water absorption of the test piece is too high and does not meet the requirements of roadbed engineering, so the test piece can not be used for researching and developing novel roadbed materials. The addition amount of more than 5 percent is too high in cost, and the popularization value and the market are not available.
Example 5.
An earthwork test piece prepared by using curing agent ISS2500 (south Africa curing agent for short) of south Africa and performance test:
1) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the south African curing agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the south Africa curing agent (1g) into the saponification slag mixed soil (1Kg), stirring uniformly, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
Example 6.
An earthwork test piece prepared by using curing agent ISS2500 of south Africa (called south Africa curing agent for short) and performance test:
1) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the south African curing agent (10g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the south Africa curing agent (10g) into the saponification slag mixed soil (1Kg), stirring uniformly, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block was immersed in tap water for 1 day and the earthwork specimen was disintegrated.
Example 7.
An earthwork test piece prepared by using curing agent ISS2500 (south Africa curing agent for short) of south Africa and performance test:
1) mixing red mud and muck according to a mass ratio of 1:0.5 to prepare red mud mixed soil; adding 50g of the south African curing agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.24MPa and the water absorption of 20.9 percent.
2) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding the south Africa curing agent (50g) into the saponification slag mixed soil (1Kg), stirring uniformly, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 1.14MPa and the water absorption of 19.8 percent.
The water absorption of the test piece is too high and does not meet the requirements of roadbed engineering, so the test piece can not be used for researching and developing novel roadbed materials. The addition amount of more than 5 percent is too high in cost, and the popularization value and the market are not available.
Example 8.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) sulfonated oil (25g), graphene oxide (0.5 g; oxygen content of 28 percent), polyhydric alcohol (glycerol, 20g), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic water repellent agent; the obtained solid waste plastic water repellent agent is shown in figure 1.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain red mud sample block, as shown in figure 2.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compression strength of 4.56MPa and the water absorption of 2.30 percent. The pH value and the heavy metal content of the water for soaking the soil piece are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.432 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent is mixed with red mud mixed soil to be used as a roadbed material, and a pavement base layer paved by replacing a water stabilization layer is shown in figure 3.
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a saponification slag sample block.
The sample block piece is placed into tap water to be soaked for 1 day, and the unconfined compression strength is 4.83MPa and the water absorption is 1.90 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.435 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent is mixed with saponification slag mixed soil to be used as a roadbed material, and a pavement base layer paved by replacing a water stabilization layer is shown in figure 4.
Example 9.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) sulfonated oil (25g), graphene oxide (0.5 g; mixing oxygen content of 53 percent), polyhydric alcohol (ethylene glycol, 20g), sodium carboxymethylcellulose (1g) and water (53.5g), and stirring for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic type water repellent agent;
2) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 4.96MPa and the water absorption of 2.85 percent. The pH value and the heavy metal content of the water for soaking the soil piece are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.432 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent (1) in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.16MPa and the water absorption of 2.56 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.435 ppm); chromium (0.003 ppm); nickel (not detected).
Example 10.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) mixing sulfonated oil (25g), graphene oxide (0.5g, oxygen content 39%), polyalcohol (pentaerythritol, 20g), sodium carboxymethylcellulose (1g) and water (53.5g) at 25 ℃, and stirring for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic water repellent;
2) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.08MPa and the water absorption of 1.98 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.444 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.56MPa and the water absorption of 1.99 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.447 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 8, 9 and 10, it can be seen that the oxygen content of graphene oxide is in the range of 28% to 53%, and the novel road base material prepared by using the solid waste plastic water repellent agent has stable properties.
Example 11.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) mixing sulfonated oil (25g), graphene oxide (0.5g, oxygen content 39%), polyalcohol (triethanolamine, 20g), sodium carboxymethylcellulose (1g) and water (53.5g) at 25 ℃, and stirring for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic type water repellent;
2) mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block piece is placed into tap water to be soaked for 1 day, and the unconfined compression strength is measured to be 5.38MPa, and the water absorption is 1.83 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.446 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.56MPa and the water absorption of 1.99 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.446 ppm); chromium (0.003 ppm); nickel (not detected).
Example 12.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) at 25 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyol (20g, the polyol is composed of pentaerythritol (5g), glycerol (5g), triethanolamine (5g) and ethylene glycol (5g), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic-type water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.22MPa and the water absorption of 2.13 percent. . The pH value and the heavy metal content of the water for soaking the earthwork sample are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
3) And (2) mixing the saponified residues and the residue soil according to the mass ratio of 1:0.5 to prepare saponified residue mixed soil, adding 1g of the solid waste plastic water repellent agent obtained in the step 1) into the saponified residue mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain the earthwork sample.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.48MPa and the water absorption of 2.01 percent. . The pH value and the heavy metal content of the water for soaking the earthwork sample are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.449 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 8 to 12, it can be seen that the polyhydric alcohol is composed of one or more of pentaerythritol, glycerol, triethanolamine and ethylene glycol, the prepared novel solid waste plastic water repellent agent has stable property, and the water-resistant roadbed material prepared by using the solid waste plastic water repellent agent has stable property.
Example 13.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) at 25 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyol (ethylene glycol, 20g), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compression strength of 4.94MPa and the water absorption of 1.96%. .
The pH value and the heavy metal content of the water for soaking the earthwork sample are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.451 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.28MPa and the water absorption of 1.98 percent. .
The pH value and the heavy metal content of the water for soaking the earthwork sample are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.447 ppm); chromium (0.003 ppm); nickel (not detected).
Example 14.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent, and performing performance test:
at 25 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyalcohol (triethanolamine, 20g), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid-waste plastic water repellent.
2) Mixing red mud and muck according to a mass ratio of 1:0.5 to prepare red mud mixed soil; adding 1g of the solid waste plastic water repellent agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.51MPa and the water absorption of 2.02 percent. . The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.431 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block piece in tap water for 1 day, and measuring the unconfined compressive strength of 5.86MPa and the water absorption of 2.01 percent. . The pH value and the heavy metal content of the water for soaking the earthwork sample are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.440 ppm); chromium (0.003 ppm); nickel (not detected).
Example 15.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
at 25 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyol (glycerol (2g), triethanolamine (8g), ethylene glycol (3g) and pentaerythritol (7g)), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic type water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compression strength of 5.39MPa and the water absorption of 2.11 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.446 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.56MPa and the water absorption of 2.07 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.436 ppm); chromium (0.003 ppm); nickel (not detected).
From the above examples 11-15, it can be seen that various polyols perform similarly in the present invention, and therefore, in the following examples, one or more mixtures of glycerol, ethylene glycol, pentaerythritol, triethanolamine are described as the polyol.
Example 16.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) at 5 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyol (20g, the components are the same as in example 12), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid waste plastic type water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding 1g of the solid waste plastic water repellent agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.16MPa and the water absorption of 2.02 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.441 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.47MPa and the water absorption of 2.19 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.450 ppm); chromium (0.003 ppm); nickel (not detected).
Example 17.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) sulfonated oil (25g), graphene oxide (0.5g), polyol (20g, the components are the same as in example 12), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed at 58 ℃ and stirred for 4 hours to obtain dark yellow viscous liquid, namely the solid-waste plastic water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
And (3) soaking the sample block piece in tap water for 1 day, and measuring the unconfined compressive strength of 5.68MPa and the water absorption of 1.87%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.438 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.72MPa and the water absorption of 2.03 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.441 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 1, 6 and 7, it is known that, as long as several substances can be uniformly mixed to form the solid waste plastic water repellent, the influence of temperature on the solid waste plastic water repellent is not great, and the influence of the properties of the novel roadbed material pressed by the solid waste plastic water repellent and the mixed soil is not great.
Example 18.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent and testing the performance:
1) at 25 ℃, sulfonated oil (25g), graphene oxide (0.5g), polyol (20g, the components are the same as in example 12), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed and stirred for 0.5 hour to obtain dark yellow viscous liquid, namely the solid waste plastic water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding the solid waste plastic water repellent agent (1g) into red mud mixed soil (1Kg), stirring, compacting, and maintaining for 7 days to obtain sample blocks.
The sample block piece is placed into tap water to be soaked for 1 day, and the unconfined compression strength is measured to be 5.37MPa, and the water absorption is measured to be 1.89%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.446 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.51MPa and the water absorption of 2.28 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.439 ppm); chromium (0.003 ppm); nickel (not detected).
Example 19.
Preparing a solid waste plastic water repellent agent, preparing a earthwork test piece by using the solid waste plastic water repellent agent, and performing performance test:
1) sulfonated oil (25g), graphene oxide (0.5g), polyol (20g, the components are the same as in example 12), sodium carboxymethylcellulose (1g) and water (53.5g) are mixed at 25 ℃, and stirred for 10 hours to obtain dark yellow viscous liquid, namely the solid-waste plastic water repellent.
2) Mixing red mud and muck according to the mass ratio of 1:0.5 to prepare red mud mixed soil; adding 1g of the solid waste plastic water repellent agent into 1Kg of red mud mixed soil, uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block piece in tap water for 1 day, and measuring the unconfined compressive strength of 5.59MPa and the water absorption of 2.07 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.440 ppm); chromium (0.003 ppm); nickel (not detected).
3) Mixing the saponification slag and the slag soil according to the mass ratio of 1:0.5 to prepare saponification slag mixed soil, adding 1g of the solid waste plastic water repellent agent in the step 1) into the saponification slag mixed soil (1Kg), uniformly stirring, compacting and maintaining for 7 days to obtain a sample block.
And (3) soaking the sample block in tap water for 1 day, and measuring the unconfined compressive strength of 5.82MPa and the water absorption of 2.01 percent. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 11, 18 and 19, it is known that the time has little influence on the properties of the solid waste plastic water repellent and the properties of the water-resistant roadbed material formed by pressing the solid waste plastic water repellent and the mixed soil as long as several substances can be uniformly stirred to form the solid waste plastic water repellent.
Examples 20 to 27:
in the following examples, sulfonated oil, graphene oxide, polyol, sodium carboxymethylcellulose and water are mixed and stirred for 4 hours at 25 ℃ to prepare the solid waste plastic water repellent, and the polyol adopted in examples 20 to 23 and 24 to 27 is glycerol, ethylene glycol, pentaerythritol and triethanolamine in turn; the dosage of the mixed soil is 100Kg, the mass ratio of the red mud or the saponification slag to the muck in the mixed soil is 1:1, and the adopted raw materials and the performance test are as follows:
examples 11 and 20 to 27 show that the mechanical strength of the building material formed by mixing and compacting the solid waste plastic water repellent with the red mud or the saponification slag mixed soil meets the requirement by controlling the feeding mass ratio within the following range (sulfonated oil: graphene oxide: polyhydric alcohol: sodium carboxymethyl cellulose: water: 10-35: 0.5-5: 8-35: 0.2-1.2: 24.8-81.3).
Example 28.
Preparing a water-resistant roadbed material earthwork test piece and testing the performance:
the solid waste plastic water repellent agent (1g) prepared in example 8 was added to 1Kg of red mud mixed soil (500g of red mud and 500g of muck), stirred, compacted and maintained for 7 days, and the sample block was immersed in tap water for 1 day to obtain an unconfined compressive strength of 4.65MPa and a water absorption of 1.87%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent (1g) prepared in example 8 was added to 1Kg of the mixture of the saponification slag (500g of the saponification slag and 500g of the slag soil), stirred, compacted and cured for 7 days, and the sample block was immersed in tap water for 1 day to obtain an unconfined compressive strength of 4.92MPa and a water absorption of 2.08%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
Example 29.
Preparing a water-resistant roadbed material earthwork test piece and testing the performance:
the solid waste plastic water repellent agent (1g) prepared in example 8 was added to 1Kg of red mud mixed soil (333g of red mud and 667g of muck), stirred, compacted and maintained for 7 days, and the sample block piece was immersed in tap water for 1 day to obtain an unconfined compressive strength of 5.45MPa and a water absorption of 2.56%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent (1g) prepared in example 8 was added to 1Kg of saponification slag mixed soil (333g of saponification slag and 667g of slag soil), stirred, compacted and maintained for 7 days, the sample block was immersed in tap water for 1 day, and the unconfined compressive strength was measured to be 4.92MPa, and the water absorption rate was measured to be 2.88%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.448 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 19, 28, and 29, it is known that the mass ratio of the red mud (or the saponified slag) to the muck is controlled to be 1: 0.5-2.0, and the water-resistant roadbed material obtained by adding the solid waste plastic water-resistant agent into the mixed soil has good properties.
Example 30
Preparing a water-resistant roadbed material earthwork test piece and testing the performance:
the solid waste plastic water repellent agent (10g) prepared in example 8 was added to 1Kg of red mud mixed soil (500g of red mud and 500g of muck), stirred, compacted and maintained for 7 days, and the sample block was immersed in tap water for 1 day to obtain an unconfined compressive strength of 6.12MPa and a water absorption of 1.86%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.440 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent (10g) prepared in example 8 was added to the saponification slag mixed soil (1Kg), stirred, compacted and maintained for 7 days, and the sample block piece was immersed in tap water for 1 day, and the unconfined compressive strength was measured to be 6.09MPa, and the water absorption rate was measured to be 1.58%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.436 ppm); chromium (0.003 ppm); nickel (not detected).
Example 31
Preparing a water-resistant roadbed material earthwork test piece and testing the performance:
the solid waste plastic water repellent agent (0.1g) prepared in example 8 was added to 1Kg of red mud mixed soil (500g of red mud and 500g of muck), stirred, compacted and maintained for 7 days, and the sample block piece was immersed in tap water for 1 day to obtain an unconfined compressive strength of 4.32MPa and a water absorption of 2.74%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.440 ppm); chromium (0.003 ppm); nickel (not detected).
The solid waste plastic water repellent agent (0.1g) prepared in example 8 was added to the saponification slag mixed soil (1Kg), stirred, compacted and maintained for 7 days, and the sample block was immersed in tap water for 1 day to obtain an unconfined compressive strength of 4.55MPa and a water absorption of 2.98%. The pH value and the heavy metal content of the water for soaking the soil blocks are respectively as follows: pH 6.9; content of heavy metal ions: iron (0.436 ppm); chromium (0.003 ppm); nickel (not detected).
From examples 19, 30 and 31, it can be seen that when the added mass of the solid waste plastic water repellent agent is 0.01 wt% to 1 wt% of the mass of the mixed soil, the mechanical strength of the roadbed material formed by mixing and compacting the solid waste plastic water repellent agent and the mixed soil meets the requirement.
All the examples show that the material obtained by recycling the solid waste has water resistance, avoids the overflow of water-soluble alkaline substances and heavy metal ions in the red mud or the saponification slag and protects the environment.
Claims (8)
1. A solid waste plastic water repellent agent for recycling red mud or saponification slag is prepared from the following components in percentage by mass:
10-35% of sulfonated oil; 0.5-5% of graphene oxide; 8-35% of polyhydric alcohol; 0.2-1.2% of sodium carboxymethylcellulose; the balance being water.
2. The solid waste plastic water repellent agent for recycling red mud or saponification slag according to claim 1, wherein the polyhydric alcohol is one or a mixture of glycerol, ethylene glycol, pentaerythritol and triethanolamine.
3. The solid waste plastic water repellent agent for red mud or saponification slag recycling according to claim 2, wherein the oxygen content of the graphene oxide is as follows: 28% -53%.
4. The preparation method of the solid-waste plastic water repellent agent for red mud or saponification slag reclamation according to any one of claims 1 to 3, which comprises the following specific steps: mixing the sulfonated oil, graphene oxide, polyol, sodium carboxymethylcellulose and water, and stirring at the temperature of 5-58 DEG CoAnd C, stirring for 0.5-10 hours to obtain the solid waste plastic type water repellent agent.
5. The method for preparing the solid waste plastic water repellent agent for red mud or saponification slag recycling according to claim 4, wherein the stirring temperature is selected from room temperature.
6. A water-resistant building material for recycling red mud or saponification slag, which is prepared by mixing the solid waste plastic water-resistant agent of one of claims 1 to 3 with mixed soil according to the mass ratio of 100: 0.01-1.0 percent by weight; the mixed soil is red mud mixed soil or saponification slag mixed soil, and the mass ratio of the red mud to the slag soil in the red mud mixed soil is 1: 0.5-2; the mass ratio of the saponification slag to the residue soil in the saponification slag mixed soil is 1: 0.5-2.
7. The water-resistant building material for recycling red mud or saponified slag as claimed in claim 6, wherein the water-resistant building material is mainly a water-resistant roadbed material.
8. The water-resistant building material for recycling red mud or saponified slag as claimed in claim 7, wherein the water-resistant roadbed material is specifically roadbed water stabilizing layer material.
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