CN113831152B - All-solid-waste high-strength permeable geopolymer concrete and preparation method thereof - Google Patents
All-solid-waste high-strength permeable geopolymer concrete and preparation method thereof Download PDFInfo
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- 239000002910 solid waste Substances 0.000 title claims abstract description 27
- 229920003041 geopolymer cement Polymers 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 110
- 239000012190 activator Substances 0.000 claims abstract description 51
- 239000003513 alkali Substances 0.000 claims abstract description 50
- 239000010881 fly ash Substances 0.000 claims abstract description 36
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 35
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 35
- 239000004088 foaming agent Substances 0.000 claims abstract description 33
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 33
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 32
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 32
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002986 polymer concrete Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000002440 industrial waste Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000008247 solid mixture Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 26
- 230000035699 permeability Effects 0.000 abstract description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 16
- 239000011380 pervious concrete Substances 0.000 description 10
- 229920000876 geopolymer Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of solid waste resource utilization and geopolymer concrete preparation, in particular to a full-solid waste high-strength permeable polymer concrete and a preparation method thereof; the raw materials comprise, by mass, 60-70 parts of a recycled coarse aggregate, 30-40 parts of a cementing material, a rosin resin type foaming agent, nano silicon carbide and an alkali activator; the cementing material comprises, by mass, 20-30% of fly ash, 60-70% of slag and 5-10% of silica fume. The all-solid-waste high-strength permeable polymer concrete can keep higher strength while realizing high permeability, simultaneously uses industrial waste and/or construction waste as coarse aggregate, and uses slag and fly ash as cementing materials to reduce carbon dioxide emission, thereby providing support for the green sustainable development of sponge city construction and building industry on the material level.
Description
Technical Field
The invention relates to the technical field of solid waste resource utilization and geopolymer concrete preparation, in particular to a full-solid waste high-strength permeable polymer concrete and a preparation method thereof.
Background
With the global seasonal change aggravation, the sponge city construction is promoted to become an innovative expression for constructing the water elastic city. Meanwhile, due to the emission of a large amount of greenhouse gases and the consumption of natural resources brought by the traditional portland cement industry, the use of substitutes such as slag, fly ash and the like as cementing materials provides possibility for sustainable green development of the industry. In addition, with the demolition of waste buildings, a large amount of solid waste of the buildings is urgently needed to be disposed. Therefore, the full-solid-waste high-strength permeable polymer concrete can better serve sponge city construction, green sustainable development planning of concrete industry is realized, and the requirement for building waste treatment is met.
Document 1 (plum blossom root, Wu gang, Xiao Yi Chun, etc.; a high-strength pervious concrete and a method for producing the same; publication No. CN113185238A) discloses a method for producing a high-strength pervious concrete. Although the lignosulfonate water reducing agent can improve the compressive strength of concrete, the concrete strength cannot reach the expected standard in some embodiments, and the porosity cannot reach 20% so as to achieve the expected water permeability effect.
Document 2 (Xieling; a high-strength water-permeable concrete and a preparation method thereof; publication No. CN113354361A) discloses a high-strength water-permeable concrete and a preparation method thereof. The strength and the water permeability coefficient of the concrete can be effectively improved by doping reinforcing agents such as aluminum oxide, nano titanium dioxide, boron carbide and the like. However, the treatment of alumina is complicated, and the temperature needs to be raised to between 700 and 750 ℃, which is difficult to be practically applied.
Document 3 (Gulian, Yuan Dong, Zhan; a pervious concrete and a method for producing the same; publication No. CN111393101A) discloses a pervious concrete and a method for producing the same. The fiber can be wrapped on the surface of the aggregate and effectively improve the strength of the concrete. And the introduction of the foaming agent improves the water permeability and improves the construction workability, thereby being more convenient for practical application. However, the water permeability coefficient thereof could not reach 4.0 mm/s.
Based on the above, it is highly desirable to provide a concrete with high water permeability coefficient, high porosity, simple preparation method and wide raw material source.
Disclosure of Invention
The invention aims to provide a full-solid-waste high-strength permeable polymer concrete and a preparation method thereof. The all-solid-waste high-strength permeable polymer concrete can keep high strength while realizing high permeability, simultaneously uses industrial waste and/or construction waste as coarse aggregate, and uses slag and fly ash as cementing materials to reduce carbon dioxide emission, and provides support for green sustainable development of sponge city construction and construction industry on the material level.
According to one technical scheme, the all-solid-waste high-strength permeable polymer concrete comprises, by mass, 60-70 parts of a recycled coarse aggregate, 30-40 parts of a cementing material, a rosin resin type foaming agent, nano silicon carbide and an alkali activator;
the cementing material comprises, by mass, 20-30% of fly ash, 60-70% of slag and 5-10% of silica fume.
In the scheme of the invention, the activity is low when the fly ash is excessive, and the fluidity is poor when the fly ash is too little; excessive slag causes flash coagulation, and too low causes poor early strength; if the silica fume is excessive, the economy is poor, and if the silica fume is too low, the compactness of the system is insufficient.
Furthermore, the addition amount of the rosin resin type foaming agent is 0.5-5% of the total mass of the recycled coarse aggregate and the cementing material.
Rosin resin type blowing agents are compatible with geopolymer systems.
Furthermore, the adding amount of the nano silicon carbide is 1-3% of the total mass of the recycled coarse aggregate and the cementing material.
The nano silicon carbide has high chemical stability, low thermal expansion coefficient, high heat conductivity coefficient, wear resistance, high temperature resistance and corrosion resistance, and can be uniformly attached to the surface of a coarse aggregate, so that the surface of a finished product is compact and hydrophobic and is not easy to wear. Therefore, rainwater can be stored or can be quickly discharged through gaps among the aggregates without being absorbed, and the method has extremely strong sustainability. However, the addition amount is too much, so that the agglomeration is easy, and the fiber network cannot be formed if the addition amount is too little, so that the addition amount of the nano silicon carbide is limited to 1-3% of the total mass of the recycled coarse aggregate and the cementing material.
Further, the proportion of the total mass of the recycled coarse aggregate, the cementing material and the alkali activator is 1 kg: 300-500 mL.
Further, the recycled coarse aggregate is industrial waste and/or construction waste, and the particle size is 5-20 mm;
further, the Mohs hardness of the nano silicon carbide is 9.5, and the microhardness is 2840-3320 kg/mm 2 。
Further, the alkali activator is formed by compounding 8mol/L sodium hydroxide aqueous solution and sodium silicate aqueous solution according to the mass ratio of 3:7, wherein the sodium silicate aqueous solution is Na 2 O·nSiO 2 N is 1.5 to 3.5.
Further, Al in the fly ash 2 O 3 And SiO 2 More than 50 wt% of the total weight of the composition, and the specific surface area of the composition is 600-800 m 2 The screen residue of a 45 mu m square hole sieve is less than 1 percent per kg.
Further, the moisture content of the slag is less than 1%, and the specific surface area is 380-410 m 2 /kg。
Further, the particle size of the silica fume is 0.1-0.3 μm, and the specific surface area is 15000-30000 m 2 /kg。
According to the second technical scheme, the preparation method of the all-solid-waste high-strength permeable polymer concrete comprises the following steps:
(1) uniformly stirring and mixing the fly ash, the slag, the silica fume, the rosin resin type foaming agent and the nano silicon carbide at a low speed, adding the regenerated coarse aggregate, and uniformly stirring to obtain a solid mixture;
(2) adding an alkali activator into the solid mixture, and uniformly stirring to obtain full-solid waste geopolymer concrete slurry;
(3) and transferring the all-solid-waste geopolymer concrete slurry into a mould for curing, and then demoulding to obtain the all-solid-waste high-strength permeable geopolymer concrete.
Further, the low-speed stirring in the step (1) is specifically 300-;
further, the curing condition in the step (3) is normal-temperature curing for 24 hours.
Compared with the prior art, the invention has the beneficial effects that:
the permeable polymer concrete is formed by using a mixture of fly ash, silica fume and slag in a certain ratio as a cementing material and recycled coarse aggregate. The geopolymer cementing material is used as an inorganic cementing material, has good bonding performance with recycled coarse aggregate, and thus has both water permeability and strength. The rosin resin type foaming agent is matched to improve the porosity of the geopolymer concrete, so that the water permeability effect of the concrete is ensured by improving the porosity of the material on the premise of ensuring the strength of the concrete.
The invention can make full use of industrial waste and construction waste to realize waste recycling. Raw materials are convenient to collect, and compared with the traditional silicate concrete, the concrete has the advantage of environmental protection.
The invention can exert the advantage of strong cohesiveness of geopolymer concrete, realizes the cohesiveness among the recycled coarse aggregates, and has the advantage of high strength compared with the traditional pervious concrete. The geopolymer is an organic polymer, and has a long molecular structure and self-rotation property of chain links or chain segments in macromolecules, so that the geopolymer has certain elasticity and plasticity.
The geopolymer concrete is adopted, and because a large number of mesopores exist in the geopolymer cementing material, the freezing point of aqueous solution in the pores is greatly reduced, the possibility of freeze-thaw diseases caused by water freezing is greatly reduced, and the applicability of the pervious concrete in severe cold areas is improved.
The water permeability of the pervious concrete prepared by the technical scheme is higher than that of common pervious concrete, the preparation process does not involve heating and other conditions, the operation is simple, and the method is suitable for large-scale production and use.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing polymer concrete with high water permeability in example 1 of the present invention.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
In the following examples of the invention, the raw materials used were:
fly ash: the specific surface area of the power plant is 600-800 m 2 Kg, the residue of a square hole sieve with the size of 45 mu m is less than 1 percent;
slag: drying the raw materials in an iron-making plant until the water content is less than 1 percent, and grinding the raw materials until the specific surface area is 380-410 m 2 /kg；
Silica fume: the particle distribution range is 0.1-0.3 μm, the specific surface area is 15000-30000 m 2 /kg；
And (3) regenerating coarse aggregate: regenerating machine-made sand, wherein the source is a building demolition object, and crushing the sand until the particle size is between 5 and 20 mm;
rosin resin type foaming agent: market purchase;
nano silicon carbide: the source is purchased from the market, the Mohs hardness is 9.5, and the microhardness is 3100kg/mm 2 ；
Alkaline activators: preparing 8mol/L NaOH solution according to the mass ratio of 3:7 and Na 2 O·2SiO 2 And compounding the aqueous solution to obtain the compound.
Example 1
Weighing the following raw materials in parts by weight: 30 parts of a cementing material (calculated by mass fraction, 30% of fly ash, 60% of slag and 10% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
The preparation method is as follows (the specific flow chart is shown in figure 1):
(1) adding the fly ash, the slag, the silica fume, the foaming agent and the nano silicon carbide into a stirrer and stirring for 2 minutes at 300 rpm; and adding the regenerated coarse aggregate, uniformly stirring, slowly adding the alkali activator, and uniformly stirring for 6min to obtain the full-solid waste geopolymer concrete slurry.
(2) The all solid waste geopolymer concrete slurry was transferred to a steel mold of 70.7 × 70.7 × 70.7mm specification, shaken for 60 seconds using a table shaker to remove air bubbles, and the surface was trowelled.
(3) And curing for 24 hours at normal temperature to demould (because of the function of slag, the geopolymer has higher early strength and does not need curing).
Example 2
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (32 mass percent of fly ash, 62 mass percent of slag and 6 mass percent of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 3
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (34 mass percent of fly ash, 64 mass percent of slag and 2 mass percent of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 4
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 40 parts of a cementing material (30 mass percent of fly ash, 60 mass percent of slag and 10 mass percent of silica fume), 60 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 5
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 40 parts of a cementing material (32 mass percent of fly ash, 62 mass percent of slag and 6 mass percent of silica fume), 60 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 6
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 40 parts of a cementing material (calculated by mass fraction, 34% of fly ash, 64% of slag and 2% of silica fume), 60 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 7
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 20% of fly ash, 70% of slag and 10% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 8
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 9
The method is the same as example 1 except that the raw materials are weighed according to the following parts by mass: 45 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 55 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 10
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 25 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 75 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 11
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (5% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 12
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a recycled coarse aggregate, a rosin resin type foaming agent (0.5% of the total mass of the cementing material and the recycled coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the recycled coarse aggregate), and an alkali activator (the proportion of the total mass of the recycled coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 13
The method is the same as example 1 except that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (6% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 14
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (1% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 15
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (3% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 16
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 25% of fly ash, 70% of slag and 5% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (4% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 17
The difference from example 1 is that the addition of nano silicon carbide is omitted.
Example 18
The difference from example 1 is that the addition of the rosin resin type foaming agent was omitted.
Example 19
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (40 mass percent of fly ash and 60 mass percent of slag), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2 mass percent of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 20
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (40% of silica fume and 60% of slag in mass fraction), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 21
The method is the same as example 1 except that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 15% of fly ash, 60% of slag and 25% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example 22
The difference from the example 1 is that the raw materials are weighed according to the following parts by mass: 30 parts of a cementing material (calculated by mass fraction, 40% of fly ash, 50% of slag and 10% of silica fume), 70 parts of a regenerated coarse aggregate, a rosin resin type foaming agent (2% of the total mass of the cementing material and the regenerated coarse aggregate), nano silicon carbide (2% of the total mass of the cementing material and the regenerated coarse aggregate), and an alkali activator (the proportion of the total mass of the regenerated coarse aggregate, the cementing material and the alkali activator is 1 kg: 500 mL).
Example of Effect verification
Performance test experiments: the high-strength pervious concrete is prepared according to the methods in the examples and the respective proportions, and the following performance tests are carried out:
(1) detecting the water permeability coefficient according to a test method specified in CJJ/T135-2009 technical Specification for permeable cement concrete pavements;
(2) the compressive strength is tested according to GB/T500-81-2002 Standard of mechanical Properties test methods of ordinary concrete;
(3) the porosity was tested according to DB11/T775-2010 Specification for pervious concrete pavements.
(4) The freeze-thaw tests were performed according to the test method for long-term performance and durability of ordinary concrete (GBJ 82-85).
The test results are shown in Table 1.
TABLE 1
It can be seen from comparing examples 1-3 or examples 4-6 that as the mass ratio of fly ash to silica fume increases, the strength of the material increases, but the corresponding permeability coefficient and porosity decrease. Therefore, when the mass ratio of the fly ash to the silica fume is about 3:1, the water permeability can reach more than 4.0mm/s, and the porosity is about 23%. In addition, by comparing examples 1 and 4 (or examples 2 and 5, and examples 3 and 6), it can be found that the strength of the concrete is slightly reduced with the decrease in the mass fraction of the coarse aggregate, but it is not obvious. The reduction in the volume fraction of coarse aggregate also results in a reduction in the permeability coefficient and porosity. Therefore, in order to obtain a material having a high porosity and water permeability, it is recommended to use coarse aggregates with a mass fraction of about 70%. In addition, the omission of the rosin resin type foaming agent will severely reduce the porosity of the material, and the omission of the nano silicon carbide will reduce the compressive strength of the material.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The all-solid-waste high-strength permeable polymer concrete is characterized by comprising, by mass, 60-70 parts of recycled coarse aggregate, 30-40 parts of a cementing material, a rosin resin type foaming agent, nano silicon carbide and an alkali activator;
the cementing material comprises, by mass, 20-30% of fly ash, 60-70% of slag and 5-10% of silica fume;
the adding amount of the nano silicon carbide is 1-3% of the total mass of the recycled coarse aggregate and the cementing material.
2. The all-solid-waste high-strength permeable polymer concrete according to claim 1,
the addition amount of the rosin resin type foaming agent is 0.5-5% of the total mass of the recycled coarse aggregate and the cementing material;
the proportion of the total mass of the recycled coarse aggregate and the cementing material to the alkali activator is 1 kg: 300-500 mL.
3. The all-solid-waste high-strength permeable polymer concrete according to claim 1, wherein the recycled coarse aggregate is industrial waste and/or construction waste, and has a particle size of 5-20 mm; the Mohs hardness of the nano silicon carbide is 9.5, and the microhardness is 2840-3320 kg/mm 2 (ii) a The alkali activator is formed by compounding 8mol/L sodium hydroxide aqueous solution and sodium silicate aqueous solution according to the mass ratio of 3: 7.
4. The all-solid-waste high-strength permeable polymer concrete according to claim 1,
al in the fly ash 2 O 3 And SiO 2 More than 50 wt% and a specific surface area of 600-800 m 2 Kg, the residue of a square hole sieve with the size of 45 mu m is less than 1 percent;
the water content of the slag is less than 1%, and the specific surface area is 380-410 m 2 /kg；
The particle size of the silica fume is 0.1-0.3 mu m, and the specific surface area is 15000-30000 m 2 /kg。
5. A method for preparing the all-solid-waste high-strength permeable polymer concrete according to any one of claims 1 to 4, comprising the steps of:
(1) uniformly stirring and mixing the fly ash, the slag, the silica fume, the rosin resin type foaming agent and the nano silicon carbide at a low speed, adding the regenerated coarse aggregate, and uniformly stirring to obtain a solid mixture;
(2) adding an alkali activator into the solid mixture, and uniformly stirring to obtain full-solid waste geopolymer concrete slurry;
(3) transferring the all-solid-waste geopolymer concrete slurry into a mould for curing and then demoulding to obtain the all-solid-waste high-strength pervious geopolymer concrete;
and (4) curing for 24 hours at normal temperature under the curing condition in the step (3).
6. The method for preparing the all-solid-waste high-strength permeable polymer concrete according to claim 5, wherein the low-speed stirring in the step (1) is specifically 300-500 r/min.
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