CN105481321A - Modified gypsum base screed and preparation and application thereof - Google Patents
Modified gypsum base screed and preparation and application thereof Download PDFInfo
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- CN105481321A CN105481321A CN201511025585.3A CN201511025585A CN105481321A CN 105481321 A CN105481321 A CN 105481321A CN 201511025585 A CN201511025585 A CN 201511025585A CN 105481321 A CN105481321 A CN 105481321A
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- gypsum base
- major ingredient
- modified gypsum
- terrace mortar
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
-
- 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
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses modified gypsum base screed and preparation and application thereof. The screed can be used for ground leveling and decorating and is prepared from modified gypsum, sand and an appropriate quantity of building additives. By means of the method of adding an appropriate amount of steel slag fine powder, slag powder and other inorganic materials and relative additives, the water consumption for modified gypsum is lowered, the density of the material is improved, the good adhesion performance of the gypsum base material is kept, the water resistance and mechanical property of the material are improved, the quality problem that a cement terrace coating material is prone to cracking can be effectively solved, and cost performance is more excellent. Waste such as gypsum, ardealite, ground steel slag and slag powder of a power plant is fully used for preparing a gel material, waste resources are comprehensively reused, environment pollution can be easily reduced, and meanwhile good economic benefits are achieved.
Description
Technical field
The invention belongs to mortar technical field, relate to a kind of modified gypsum base terrace mortar and Synthesis and applications thereof.
Background technology
Gypsum has wide material sources, steady performance, but gypsum is due to its crystalline structure characteristic, plastering presents loose porous shape structure, water-intake rate is comparatively large, and therefore water tolerance is poor, and general full water intensity only has about 1/3 of dry strength, so most gypsum is used for producing plasterboard, gypsum block, brushing gypsum etc., and due to gypsum material more crisp, transport and install in easy fracture, also limit its use.Another important use of gypsum uses as retardant in manufacture of cement, can regulate the time of coagulation of cement.
Within 2013, China's industry byproduct gypsum generation reaches 1.84 hundred million tons, wherein 7,550 ten thousand tons, gypsum, phosphogypsum 7,000 ten thousand tons.Gypsum for cement setting retarder industry reaches 6,000 ten thousand tons, and Paper-faced gyp board industry 2,430 ten thousand tons, both account for 96% of industry byproduct gypsum utilization.Wherein the utilization ratio of desulfurated plaster and phosphogypsum is respectively 72% and 27%, but in general, industry byproduct gypsum especially phosphogypsum has very large storage accumulation, and still increases every year.
Desulfurated plaster is the industry by-product gypsum carrying out purifying treatment to the flue gas produced after sulfurous fuels burning and obtain.Phosphogypsum is the byproduct of phosphate fertilizer plant, has a large amount of phosphogypsum to stockpile in areas such as Guizhou, because its acidity is comparatively strong also containing impurity such as more F, generally needs to do process in early stage to it.Desulfurated plaster is SO in the flue gas of fuel-burning power plant
2the byproduct generated is reacted with Wingdale.Industry byproduct main component is CaSO
42H
2o, also containing some impurity, as unreacted CaCO completely
3, CaO, a small amount of phosphoric acid and potassium, sodium salt.Domestic being of limited application to gypsum at present, utilization is little, especially phosphogypsum, if these industrial gypsums can not be fully utilized well, not only to take a large amount of soils, also possibility contaminated soil and water source, bring serious secondary pollution, affect the benign development of enterprise and society.Thus explore and increase the application of gypsum in building field, meeting the demand of building materials market, is one of developing direction of gypsum from now on.
Modified gypsum base terrace mortar is a kind of novel floor material, and terrace material adopts sand-cement slurry or cement concrete preparation traditionally.Conventional cement mortar is large owing to shrinking, and adhesive property is poor, very easily produces hollowing cracking, increases later maintenance cost.The thickness of cement concrete generally needs more than 5 centimeters, and density is large, can increase buildings deadweight, its quality and Construction control in close relations, easily there are the quality problems such as hollowing cracking.
Therefore, those skilled in the art are devoted to exploitation one and utilize industrial by-product β gypsum (plaster of Paris) to prepare the correlation technique of gypsum base terrace mortar, to improve the performances such as the intensity of gypsum base terrace mortar and water tolerance.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide that a kind of water tolerance is strong, good mechanical performance, the with low cost and modified gypsum base terrace mortar of environmental protection, can be used for the thin layer of flooring levelling with decoration.
For achieving the above object, the invention provides a kind of modified gypsum base terrace mortar, this terrace mortar comprises major ingredient and one or more building admixtures, and wherein major ingredient comprises plaster of Paris, slag powders, cement and medium sand.
Further, the major ingredient of described modified gypsum base terrace mortar is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
Retardant 0.5-3 ‰;
Water reducer 0-2 ‰.
Wherein, described plaster of Paris refers to that desulfurated plaster and/or phosphogypsum are after calcination process, the gypsum being main component with β-calcium sulphate hemihydrate.Preferably, described plaster of Paris is that the mixture of desulfurated plaster and phosphogypsum obtains through calcination process, and wherein phosphogypsum quality accounting is in the mixture 0-50%.In the preferred embodiment of the present invention, described plaster of Paris is that desulfurated plaster and phosphogypsum obtain through calcination process after 1:1 premix in mass ratio, the gypsum being main component with β-calcium sulphate hemihydrate.
Slag powders in the slurry component of level ground, described modified gypsum base excites by the calcium hydroxide of hydrated cementitious, generate C-S-H gel on the one hand, a certain amount of ettringite is generated on the one hand with dihydrate gypsum, also generate a small amount of hard afwillite simultaneously, the later stage ultimate compression strength of composite gelled material and water tolerance are increased substantially.The chemical composition of ground blast furnace slag is more stable, very close with ordinary Portland cement, as CaO30-42%, SiO
235-38%, Al
2o
310-18%, MgO5-14% etc., have good hydration activity, can very fast aquation thus improve the early strength of material under alkaline excitation, make use of Metallurgical Factory simultaneously and produce the waste produced.Meanwhile, slag powders has good workability and mobility, can improve the application property of material, degree of compactness and water tolerance.
Preferably, described slag powders is S95 GBFS.
Cement in the slurry component of level ground, described modified gypsum base can increase substantially gelling material ultimate compression strength performance, improves the water resistance of material simultaneously; Preferably, described cement is P.O425 or 525 ordinary Portland cements.
Medium sand silt content in the slurry component of level ground, described modified gypsum base is less than 1%, and water ratio is less than 0.3%.
Retardant and water reducer are building admixture, and significantly can improve the mechanical property of terrace mortar system, mobility, stability and application property, be indispensable integral part.
Preferably, described retardant is preferably the RetardanP retardant that German TRICOSAL company produces, and the retarding effect of this retardant is good, low to intensity effect, the time of coagulation of adjustable terrace mortar.
Preferably, described water reducer is preferably three auspicious G15 polycarboxylic acid high-efficiency water reducer for gypsums, and be characterized in good to gypsum dispersion effect, water-reducing rate is high, increases substantially the final strength of terrace mortar.
Preferably, the major ingredient of described modified gypsum base terrace mortar also comprises steel-making slag powder, and steel-making slag powder can further improve workability and the mobility of mortar, and the application property of raising material, degree of compactness and water tolerance.
Steel-making slag powder is the waste residue of steel-making, has higher hardness.Ground steel slag in the basic conditions can aquation, and the present invention utilizes the Ca (OH) after cement clinker aquation
2or other alkali-activators, reduce the early stage hydration heat of material and the further late hardness improving the materials such as terrace mortar, improve the wear resistance of material.Preferably, described ground steel slag is the one-level steel-making slag powder meeting relevant national standard.
Preferably, described modified gypsum base terrace mortar comprises major ingredient and building admixture, and described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
Retardant 0.5-3 ‰;
Water reducer 0-1 ‰.
Further, described modified gypsum can also comprise one or more building admixtures such as defoamer, ether of cellulose, redispersible latex powder.
Mix a certain amount of defoamer and can eliminate the bubble introduced in whipping process fast, improve degree of compactness and the surface smoothness of material, the final intensity improving material of construction; Preferably, described defoamer is the P803 powder defoamer that German bright icepro Chemical Group is produced.
Mix a certain amount of ether of cellulose and can improve adhesive property and water retention property, the MECELLOSEPMC-40US that Korea S's Samsung chemical company is produced.
Mix cohesiveness, water tolerance, wear resistance, cohesion stability etc. that a certain amount of redispersible latex powder can improve terrace mortar.More preferably 5022L or the 5010N redispersible latex powder of Wa Ke company.
In a kind of better embodiment of the present invention, described modified gypsum base terrace mortar comprises major ingredient and building admixture, and described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
Retardant 0.5-2 ‰;
Water reducer 0-1 ‰.
In another kind of better embodiment of the present invention, described modified gypsum base terrace mortar comprises major ingredient and building admixture, and described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
In another better embodiment of the present invention, described modified gypsum base terrace mortar comprises major ingredient and building admixture, and described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
In a better embodiment more of the present invention, described modified gypsum base terrace mortar comprises major ingredient and building admixture, and described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
The floor materials such as the alternative traditional cement mortar of modified gypsum base terrace mortar provided by the invention and cement concrete, can be used for occasion floor leveling and the decorations such as general room terrace, large supermarket, market, underground garage.
Present invention also offers a kind of preparation method of above-mentioned gypsum base terrace mortar, it comprises step:
1) plaster of Paris is prepared;
2) each raw material of major ingredient and building admixture are pressed proportioning mixing and stirring, i.e. obtained described modified gypsum base terrace mortar.
Further, step 1) described in prepare plaster of Paris method be: after first industry byproduct desulfurated plaster and/or phosphogypsum being carried out pre-treatment, mixing is dried, and then calcines, grinding after calcining, last cooling and aging.This preparation method can adopt two-step approach gypsum calcination system.
Described two-step approach refers to separately carries out drying course and calcination process, and dry and calcine locellus in described two-step approach gypsum calcination system and carry out, this system is in the technical foundation of gypsum fluidizing furnace, adopts air stream drying and fluidizing calcination technology to realize.Utilize calcining waste heat to dry by heat-conducting medium simultaneously, energy consumption can be reduced further.
Wherein, the main component of industry byproduct gypsum is dihydrate gypsum, drying and the rear obtained gypsum main component of calcining are β-semi-hydrated gypsum (plaster of Paris), again form dihydrate gypsum (plaster stone) after its water suction thus reach certain intensity, semi-hydrated gypsum has the characteristic of fast solidifying.
Preferably, the temperature of described oven dry is 50 ~ 100 DEG C, and more excellent is 70 ~ 80 DEG C, and optimum is 75 DEG C; The time of described oven dry is 1 ~ 2 hour.
Preferably, the temperature of described calcining is 130 ~ 180 DEG C, and optimum is 150 DEG C; The time of described calcining is 1 ~ 3 hour, and optimum is 2 hours.
Preferably, step 1) in adopt the tail steam of power plants generating electricity to carry out described oven dry and described calcining, make full use of resource, while guarantee gypsum performance, accomplished " zero release ".Further preferably, the waste heat of described calcining can be utilized to carry out described oven dry, thus reduce energy consumption further.
Preferably, the particle fineness after described grinding is 200 ~ 400 orders, with 300 orders for the best.
Preferably, the time of ageing after described cooling is 5-10 days, and optimum is 7 days.
Preferably, step 2) in by each raw material of major ingredient and building admixture professional dry powder mortar production line mixing and stirring.
The present invention passes through desulfurated plaster and/or phosphogypsum modification, add appropriate inorganic materials and the associated additives such as slag powders, steel-making slag powder, reduce the water consumption of modified gypsum, modified gypsum base terrace mortar of the present invention can accomplish that only 1-2 centimetre is thick, and material has good cohesive strength, shrink little, effectively can reduce the phenomenon of cement floor material hollowing cracking, reduce the consumption of material simultaneously, reduce use cost, effective reduction buildings own wt, especially high-rise.
The over dry folding strength of modified gypsum base terrace mortar provided by the invention can reach 9.4Mpa, and over dry ultimate compression strength can reach 46.1Mpa, and over dry tensile bond strength reaches 0.95MPa, excellent in mechanical performance.
The present invention has following beneficial effect:
1, response country is about the policy regulations of energy-saving and emission-reduction, compare the cement that high-temperature calcination goes out, the present invention reclaims the solid waste gypsum employing thermal power plant's generating and produce, and the tail drying with steam utilizing power plants generating electricity to produce and calcined gypsum, really accomplish the comprehensive recycling of waste resource, achieve the target of " zero release ";
2, steel-making slag powder add the intensity that can improve material, make full use of waste resource simultaneously;
3, level ground, modified gypsum base mortar thickness can accomplish 1-2cm, is starkly lower than the thickness 5-10cm of cement floor material, can effectively reduce materials'use amount, reduces costs and buildings own wt;
4, due to the micro-contraction of gypsum aquation, a small amount of ettringite that aquation produces has bulking effect, reduces the possibility of cracks in solidification process, and simultaneously due to its higher force of cohesion and bonding force, its anti-hollowing cracking performance is good.
Embodiment
Power plant's gypsum in embodiment is that Shanghai pit hole mouth power plant produces dihydrate gypsum; Cement adopts 425 ordinary Portland cements; Defoamer adopts the bright icepro P803 powder defoamer of Germany; Retardant adopts German TRICOSALRetardanP; Gypsum high-efficiency water-reducing agent of poly-carboxylic acid adopts three auspicious G15 water reducers; Redispersible latex powder adopts the 5022L latex powder of Wa Ke company; The MECELLOSEPMC-40US that ether of cellulose adopts Korea S's Samsung chemical company to produce; The S95 GBFS that slag powders adopts Baosteel to produce, the one-level steel-making slag powder that steel-making slag powder adopts Baosteel to produce.
In embodiment 1-4, the preparation method of plaster of Paris is: phosphogypsum 1:1 and desulfurated plaster premix in mass ratio after suitable pre-treatment to neutral (pH ≈ 7), after gypsum is dried by the tail steam that power plants generating electricity produces at 75 DEG C, calcine 2 hours at 150 DEG C; Then grinding to 200 order; Ageing 7 days after cooling.
In embodiment, the production method of test specimen and test mode are carried out according to the relevant regulations of GBT17671-1999 Test method for strength of hydraulic cement mortar (ISO method), wherein test specimen is shaping by the glue sand that is mixed into certain degree of mobilization of blunging of modified gypsum base terrace mortar and appropriate amount, and shrinking percentage is carried out according to ground, building material industry standard JC/T985-2005 cement-based self-leveling mortar relevant regulations.
Embodiment one:
The component of modified gypsum base terrace mortar major ingredient is: plaster of Paris 30%, slag powders 5%, cement 5%, medium sand 60%;
Build admixture and to the permillage of major ingredient quality be: retardant 1 ‰, water reducer 0.2 ‰;
Ratio of water to material 0.29;
Performance is as follows:
Embodiment two:
The component of modified gypsum base terrace mortar major ingredient is: plaster of Paris 33%, slag powders 5%, cement 5%, steel-making slag powder 2%, medium sand, 55%;
Build admixture and to the permillage of major ingredient quality be: retardant 0.9 ‰;
Ratio of water to material 0.31;
Performance is as follows:
Embodiment three:
The component of modified gypsum base terrace mortar major ingredient is: plaster of Paris 28%, slag powders 15%, cement 10%, steel-making slag powder 7%, medium sand 40%;
Build admixture and to the permillage of major ingredient quality be: retardant 1.1 ‰, water reducer 0.5 ‰, ether of cellulose 0.5 ‰;
Ratio of water to material 0.26;
Performance is as follows:
Embodiment four:
The component of modified gypsum base terrace mortar major ingredient is: plaster of Paris 33%, slag powders 5%, cement 7%, steel-making slag powder 10%, medium sand 45%;
Build admixture and to the permillage of major ingredient quality be: retardant 1.1 ‰, water reducer 1 ‰, ether of cellulose 1 ‰, defoamer 0.3 ‰, latex powder 5 ‰;
Ratio of water to material 0.21;
Performance is as follows:
Comparative example:
The component of cement based terrace mortar major ingredient is: cement 20%, breeze 10%, steel-making slag powder 10%, medium sand 60%;
Build admixture and to the permillage of major ingredient quality be: retardant 1 ‰, water reducer 0.5 ‰, ether of cellulose 0.2 ‰;
Ratio of water to material 0.21
Performance is as follows:
From experimental result, embodiment 1-4 indices is all better than comparative example substantially, and considers the advantage of its other side had, and therefore modified gypsum base terrace mortar of the present invention is the excellent selection as terrace mortar.
Can draw from above-described embodiment, modified gypsum base terrace mortar of the present invention has the following advantages:
1. make use of desulfurated plaster, phosphogypsum, steel-making slag powder and breeze in a large number, accelerate the consumption of industry byproduct and solid waste, realize the high quality comprehensive utilization of solid waste resource;
2. the tail steam calcination utilizing power plants generating electricity to produce and oven dry, accomplished energy-saving and emission-reduction, environmental protection;
3. cohesive strength is high, and shrinking percentage is little, effectively reduces the risk of floor empty drum cracking, reduces later maintenance cost.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a modified gypsum base terrace mortar, comprise terrace mortar described in it is characterized in that and comprise major ingredient and one or more building admixtures, described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
Retardant 0.5-3 ‰;
Water reducer 0-2 ‰.
2. modified gypsum base terrace mortar as claimed in claim 1, is characterized in that described plaster of Paris refers to that desulfurated plaster and/or phosphogypsum are after calcination process, the terra alba being main component with β-calcium sulphate hemihydrate.
3. modified gypsum base terrace mortar as claimed in claim 1, is characterized in that described terrace mortar also comprises steel-making slag powder.
4. modified gypsum base terrace mortar as claimed in claim 1, is characterized in that described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
Retardant 0.5-3 ‰;
Water reducer 0-1 ‰.
5. modified gypsum base terrace mortar as claimed in claim 1, is characterized in that one or more that described modified gypsum base terrace mortar also comprises in defoamer, ether of cellulose, redispersible latex powder.
6. modified gypsum base terrace mortar as claimed in claim 1, is characterized in that described major ingredient is made up of the following component in massfraction:
Described building admixture, calculates with the permillage relative to major ingredient quality, comprising:
7. the application of modified gypsum base terrace mortar in indoor terrace as described in claim 1 or 4 or 6.
8. a preparation method for the gypsum base terrace mortar as described in claim 1 or 4 or 6, is characterized in that comprising step:
1) plaster of Paris is prepared;
2) each raw material of major ingredient and building admixture are pressed proportioning mixing and stirring, i.e. obtained described modified gypsum base terrace mortar.
9. preparation method as claimed in claim 8, it is characterized in that step 1) described in prepare plaster of Paris method be: after first industry byproduct desulfurated plaster and/or phosphogypsum being carried out pre-treatment, mixing is dried, and then calcines, grinding after calcining, last cooling and aging.
10. preparation method as claimed in claim 9, is characterized in that step 1) in adopt the tail steam of power plants generating electricity to carry out described oven dry and described calcining.
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| CN108558340A (en) * | 2018-05-08 | 2018-09-21 | 沈阳建筑大学 | A kind of high tenacity phosphogypsum composite material and preparation method thereof |
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| CN116023108A (en) * | 2022-12-26 | 2023-04-28 | 北京东方建宇混凝土科学技术研究院有限公司 | High-water-resistance gypsum product and preparation method thereof |
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