CN103771801A - Dry-mixed ground mortar doped with bayer process red mud and application method thereof - Google Patents

Dry-mixed ground mortar doped with bayer process red mud and application method thereof Download PDF

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Publication number
CN103771801A
CN103771801A CN201410003868.7A CN201410003868A CN103771801A CN 103771801 A CN103771801 A CN 103771801A CN 201410003868 A CN201410003868 A CN 201410003868A CN 103771801 A CN103771801 A CN 103771801A
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red mud
bayer process
process red
mixed
ground mortar
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CN103771801B (en
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孙振平
孙栀子
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Tongji University
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Tongji University
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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
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention belongs to the technical field of a building material, and particularly relates to dry-mixed ground mortar doped with bayer process red mud and an application method thereof. The dry-mixed ground mortar is prepared from common portland cement, bayer process red mud, coal ash, cellulose ether, modified attapulgite, re-dispersible emulsion powder, a water reducer, a defoamer, a retarder and river sand. The product disclosed by the invention has the characteristics of being good in mobility, good in water-retaining property, good in adhesion, good in strength development, small in shrinkage, free of a crack, good in abrasive resistance, good in durability and the like. The product disclosed by the invention is applicable to leveling a building floor, and plays protecting and decorating roles. By adopting the dry-mixed ground mortar, the bayer process red mud can be effectively utilized, the added value of the bayer process red mud is improved, the social benefits are improved, meanwhile, the production cost of the ground mortar is reduced, and the economic benefits are improved.

Description

A kind of be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof
Technical field
The invention belongs to building material technical field, be specifically related to a kind of be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof.
Background technology
Along with the develop rapidly of building trade, have higher requirement with energy-conserving and environment-protective to building materials quality is stable.As one of most important material of construction, the appearance of premixing mortar (being commodity mortar) has solved the on-the-spot preparation of traditional mortar and has stirred the problems such as the labour intensity causing is large, quality is unstable, operating efficiency is low, pollution surrounding environment.Premixing mortar, according to the difference of supply pattern, is divided into dry-mixed mortar and wet mixing mortar two classes.Majority is dry mixed ground mortar poor fluidity in the market, and easy to crack, intensity is low, shrinks greatly, and cost is high, and these problems have limited the promotion and application of premixing ground mortar.Therefore, develop quality good, it is imperative that what cost was low be dry mixed ground mortar.Meanwhile, along with the development of our building trade, also increasing to the demand of high-quality adulterant,, there is in various degree in short supply in adulterant slag powders and the flyash of high-quality in the market in some regions.
Bayer process red mud is to use highly basic sodium hydroxide (NaOH) stripping high alumina, high ferro, boehmite type and three boehmite types soil mining and metallurgy refining aluminum oxide (Al 2o 3) time discharge red mud shape solid waste.There is data to show, outer discharge capacity average out to (1-1.1) the t/t Al of Bayer process red mud 2o 3.China is as Al 2o 3big producing country, the annual Bayer process red mud total amount producing is tens million of tons, but the comprehensive utilization ratio of Bayer process red mud is less than 5%.Add accumulation over the years, storage is surprising.At present, domestic Al 2o 3factory is mostly delivered to stockyard by red mud, relies on mountain valley or the excavation farmland wet method of building a dam to store up, and takies a large amount of land resources, causes soil and water to pollute.The chemical composition of red mud and mineral composition change to some extent because the material composition of the additive in the composition of bauxite, production technique (sintering process, mixed combining method or Bayer process), production process is different with newly-generated compound composition.The Main chemical component of red mud is silicon-dioxide (SiO 2), calcium oxide (CaO), ferric oxide (Fe 2o 3), aluminum oxide (Al 2o 3), sodium oxide (Na 2o), titanium dioxide (TiO 2) and potassium oxide (K 2o).Compare Fe in the chemical composition of Bayer process red mud with mixed combining method red mud with red mud from sintering process 2o 3and Al 2o 3content is high, Fe 2o 3can reach 28% left and right of total amount, Al 2o 3for 17% left and right of total amount, alkali content and CaO content are low.The essential mineral composition of Bayer process red mud is calcium aluminosilicate hydrate, cancrinite, uhligite, diaspore and illite.
Summary of the invention
The object of the present invention is to provide a kind of preparation cost low, favorable working performance, glutinous poly-performance is good, shrinks littlely, do not ftracture, the good and good endurance of wear resistance be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof.
The present invention proposes a kind of be mixed with Bayer process red mud be dry mixed ground mortar, be made up of ordinary Portland cement, Bayer process red mud, flyash, ether of cellulose, attapulgite modified, re-dispersible glue powder, water reducer, defoamer, retardant and river sand, the weight ratio of each component is:
Ordinary Portland cement 100
Bayer process red mud 15-40
Flyash 15-30
Ether of cellulose 0.03-0.10
Attapulgite modified 3-9
Re-dispersible glue powder 1-5
Water reducer 0.05-0.20
Defoamer 0.06-0.60
Retardant 0.02-0.10
River sand 405-550.
Each component preferably weight ratio is:
Ordinary Portland cement 100
Bayer process red mud 20-30
Flyash 20-25
Ether of cellulose 0.05-0.08
Attapulgite modified 4-6
Re-dispersible glue powder 2-4
Water reducer 0.08-0.15
Defoamer 0.08-0.60
Retardant 0.04-0.08
River sand 410-480.
In the present invention, described ordinary Portland cement is 42.5 grades of ordinary Portland cements.
In the present invention, its particle diameter of described Bayer process red mud is (5-15) μ m, and the specific surface area of nitrogen determining adsorption is (10000-20000) m 2/ kg, quality coefficient is 1.1-1.6.
In the present invention, its particle diameter of described flyash is (35-45) μ m, and the specific surface area of nitrogen determining adsorption is (300-550) m 2/ kg, quality coefficient is 1.2-1.7.
In the present invention, described ether of cellulose is hydroxymethyl-propyl cellulose ether, and its viscosity is 10000 mPa ﹒ s.
In the present invention, described attapulgite modified fineness is (200-300) order.
In the present invention, described re-dispersible glue powder is vinyl acetate and ethylene copolymer rubber powder, and its median size is 400 μ m.
In the present invention, described water reducer is poly carboxylic acid series water reducer.
In the present invention, described defoamer is silicone antifoam agent.
In the present invention, described retardant is hydroxycarboxylate's organism.
In the present invention, described river sand is medium sand, and fineness modulus is 2.3-2.5, and tap density is (1250-1450) kg/m 3.
What the present invention proposed be mixed with Bayer process red mud be dry mixed ground method for preparing mortar, concrete steps are as follows:
Accurately take ordinary Portland cement, Bayer process red mud, flyash, ether of cellulose, attapulgite modified, re-dispersible glue powder, water reducer, defoamer, retardant and river sand by aforementioned part by weight, drop into dry mixing device, after even by mechanical stirring, obtain desired product.
A kind of using method that is dry mixed ground mortar that is mixed with Bayer process red mud that the present invention proposes, concrete steps are as follows: accurately take be mixed with Bayer process red mud be dry mixed ground mortar and water, first water is added to stirrer, along with blade of stirrer rotates, the ground mortar that is dry mixed that is mixed with Bayer process red mud is at the uniform velocity dropped into stirrer.After stirring, can construct.Amount of water is the 10%-15% of dry-mixed plastering mortar total mass.
In the present invention, ordinary Portland cement, Bayer process red mud and flyash are the gelling material that is dry mixed ground mortar.
Bayer process red mud composition is similar to cement clinker, and main chemical compositions is SiO 2, CaO, Fe 2o 3, Al 2o 3, Na 2o, TiO 2and K 2o, wherein Fe 2o 3and Al 2o 3content is high, Fe 2o 3can reach 28% left and right of total amount, Al 2o 3for 17% left and right of total amount, alkali content and CaO content are relatively low.The essential mineral composition of Bayer process red mud is calcium aluminosilicate hydrate, cancrinite, uhligite, diaspore and illite.There are some researches show, within the scope of certain volume, Bayer process red mud mixes in gelling system, can make the extent of hydration of cement be improved, the increase of hydrated product has improved the connection degree between hardened paste, thereby has improved intensity, the especially early strength of mortar.Secondly, Bayer process red mud is because its particle diameter is little and specific surface area has greatly higher surfactivity, can active adsorption mixture in free water molecules, can effectively improve the serviceability of mortar mixture.In addition, Bayer process red mud powder hole is many, need water than feature high, strong retentiveness, the water requirement of Bayer process red mud ground mortar mixture to be increased, and relatively improved the water retention property of mixture.
Pulverized burned coal ash hydration process is slower, and early activity is lower, and the golden period of development of its intensity is after 28d.Meanwhile, although in flyash, there is a large amount of aluminium silicate minerals, because [SiO wherein 4] 4-the tetrahedron polymerization degree is high, so activity is lower.Flyash is natural is acid, and its activeconstituents can be excited under alkaline condition, and Bayer process red mud is alkalescence, can excite the pozzolanic activity of flyash.The aquation of flyash is mainly the hydrated product calcium hydroxide (Ca (OH) of flyash and cement 2) between reaction, influence each other with the aquation of cement, mutually promote.
Ordinary Portland cement in the mortar of ground, Bayer process red mud and three kinds of gelling material of flyash of being dry mixed of the present invention are used in conjunction with, and play plural gel effect, reach the effect of mutual supplement with each other's advantages: utilize Bayer process red mud to improve the early strength of gelling system; And utilize flyash to make up the poor defect of gelling system later strength, this three just forms a strength development " echelon ", that Bayer process red mud and cement provide intensity in early days, later stage is that coal ash lifting is for intensity, the structure that has so just guaranteed gelling system more accesses abundant development, density improves constantly, the development that intensity can continue.Bayer process red mud is incorporated into the effect in flyash-cement cementitious system with two aspects: be on the one hand Bayer process red mud and the reacting of cement, this reaction has promoted the hydration reaction speed of cement; The hydrated product Ca (OH) of Bayer process red mud and cement on the other hand 2the effect of common and flyash.The effect of in fact above-mentioned two aspects is to connect each other interactionally, and Bayer process red mud is promoting also to have promoted in hydrated cementitious the aquation of flyash.
In the present invention, ether of cellulose and attapulgite modified be the water-keeping thickening material that is dry mixed ground mortar, can improve toughness and the water-retentivity of mortar.
After ether of cellulose in mortar dissolves in water, be effectively uniformly distributed in system because surface-active action has guaranteed gelling material, make mortar more stable.Ether of cellulose, as polymer long-chain material, adds after cement cementitious system, makes the moisture in mortar be difficult for losing, and progressively discharges within long period of time, gives water-retentivity and workability that mortar is good.Meanwhile, ether of cellulose is also a kind of stablizer, can prevent the disadvantageous effect of segregation and the top layer peeling of mortar.
Attapulgite be a kind of tool fiber pattern layer chain transition structure containing Shuifu County's magnesium silicate clay mineral.Attapulgite modified is the pencil aggregate of the fibroplastic crisscross intersection of needle-like crystal.Aggregate, in mortar, prevents the sedimentation of sand in mortar thereby can wrap up the macrobeads such as sand.Attapulgite modified viscosity, water retention and the thixotropy that can improve mortar.
In the present invention, folding strength, cohesive strength and the wearability of mortar can be improved adding of re-dispersible glue powder, the shrinking percentage of mortar can be reduced.These two kinds of components of cement and re-dispersible glue powder all have the function of consolidating material, and the former is by forming hydrated product with the chemical reaction of mixing water, and the latter is worked by film forming in drying process.The coking mechanism of this complementation provides stability and security for whole system.
In the present invention, adding of water reducer makes mortar have higher mobility and stability.
In the present invention, defoamer add the air content that can reduce fresh mortar, improve ultimate compression strength.
In the present invention, adding of retardant can be adjusted time of coagulation.
The present invention utilizes Bayer process red mud to be dry mixed ground mortar as adulterant preparation, has good fluidity, good water-retaining property, glutinous poly-property good, and strength development is good, it is little to shrink, do not ftracture, wear resistance is good and the characteristic such as good endurance.Product of the present invention not only can solve common be dry mixed ground mortar poor fluidity, easy to crack, shrink large problem; Can also make full use of Bayer process red mud, turn waste into wealth, reduce ground mortar preparation cost, increase economic efficiency; Meanwhile, can also alleviate Bayer process red mud and stack environmental pollution and the land wastage problem brought processed; In addition, the application of Bayer process red mud in the mortar of ground, also can alleviate high-quality blended material problem in short supply in the market.
Embodiment
Further illustrate the present invention below by embodiment.
Embodiment 1, what be mixed with Bayer process red mud is dry mixed a ground mortar, by ordinary Portland cement 100, and Bayer process red mud 15, flyash 15, ether of cellulose 0.03, attapulgite modified 3, re-dispersible glue powder 1, water reducer 0.05, defoamer 0.06, retardant 0.02, the weight ratio of river sand 405 is formulated.Add water and stir by 10% of dry-mixed masonry mortar total mass, obtain required product.The performance test results is in table 1.
Embodiment 2, what be mixed with Bayer process red mud is dry mixed a ground mortar, by ordinary Portland cement 100, and Bayer process red mud 20, flyash 20, ether of cellulose 0.08, attapulgite modified 5, re-dispersible glue powder 4, water reducer 0.10, defoamer 0.40, retardant 0.04, the weight ratio of river sand 450 is formulated.Add water and stir by 12% of dry-mixed masonry mortar total mass, obtain required product.The performance test results is in table 1.
Embodiment 3, what be mixed with Bayer process red mud is dry mixed a ground mortar, by ordinary Portland cement 100, and Bayer process red mud 40, flyash 30, ether of cellulose 0.10, attapulgite modified 9, re-dispersible glue powder 5, water reducer 0.20, defoamer 0.60, retardant 0.10, the weight ratio of river sand 550 is formulated.Add water and stir by 15% of dry-mixed masonry mortar total mass, obtain required product.The performance test results is in table 1.
 
table 1 embodiment the performance test results
Performance index Embodiment 1 Embodiment 2 Embodiment 3
Denseness (mm) 50 54 52
Time of coagulation (min) 438 405 385
Water retention (%) 92.6 92.9 93.6
Cohesive strength (MPa) 0.8 0.9 0.9
28d ultimate compression strength (MPa) 28.5 28.6 27.8
28d folding strength (MPa) 7.5 7.8 8.0
28d shrinking percentage (%) 0.042 0.040 0.044

Claims (10)

  1. One kind be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that being made up of ordinary Portland cement, Bayer process red mud, flyash, ether of cellulose, attapulgite modified, re-dispersible glue powder, water reducer, defoamer, retardant and river sand, the weight ratio of each component is:
    Ordinary Portland cement 100
    Bayer process red mud 15-40
    Flyash 15-30
    Ether of cellulose 0.03-0.10
    Attapulgite modified 3-9
    Re-dispersible glue powder 1-5
    Water reducer 0.05-0.20
    Defoamer 0.06-0.60
    Retardant 0.02-0.10
    River sand 405-550.
  2. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that the weight ratio of each component is:
    Ordinary Portland cement 100
    Bayer process red mud 20-30
    Flyash 20-25
    Ether of cellulose 0.05-0.08
    Attapulgite modified 4-6
    Re-dispersible glue powder 2-4
    Water reducer 0.08-0.15
    Defoamer 0.08-0.60
    Retardant 0.04-0.08
    River sand 410-480.
  3. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described ordinary Portland cement is 42.5 grades of ordinary Portland cements.
  4. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described Bayer process red mud particle diameter is (5-15) μ m, the specific surface area of nitrogen determining adsorption is (10000-20000) m 2/ kg, quality coefficient K is 1.1-1.6.
  5. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, the particle diameter that it is characterized in that described flyash is (35-45) μ m, the specific surface area of nitrogen determining adsorption is (300-550) m 2/ kg, quality coefficient K is 1.2-1.7.
  6. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described ether of cellulose is hydroxymethyl-propyl cellulose ether, its viscosity is 10000mPa ﹒ s.
  7. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described attapulgite modified fineness is for (200-300) order.
  8. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described re-dispersible glue powder is vinyl acetate and ethylene copolymer rubber powder, its median size is 400 μ m.
  9. According to claim 1 a kind of be mixed with Bayer process red mud be dry mixed ground mortar, it is characterized in that described water reducer is poly carboxylic acid series water reducer, described defoamer is silicone antifoam agent, described retardant is hydroxycarboxylate's organism, described river sand is medium sand, fineness modulus is 2.3-2.5, and tap density is (1250-1450) kg/m 3.
  10. 10. an a kind of using method that is dry mixed ground mortar that is mixed with Bayer process red mud as claimed in claim 1, the amount of water while it is characterized in that construction application is the 10%-15% that is dry mixed ground mortar total mass.
CN201410003868.7A 2014-01-06 2014-01-06 A kind of be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof Expired - Fee Related CN103771801B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104944828A (en) * 2015-06-19 2015-09-30 阚春明 Cement-based high-molecular polymer waterproof mortar additive and preparation method and application thereof
CN111825377A (en) * 2020-06-01 2020-10-27 金华市中天城建绿色再生资源有限公司 Method for manufacturing brick-concrete fully-regenerated dry-mixed mortar
CN114133175A (en) * 2021-12-31 2022-03-04 上海力阳道路加固科技股份有限公司 Red mud-based polymer color mortar and preparation method thereof
CN115974527A (en) * 2022-12-30 2023-04-18 中南大学 Fly ash-red mud-based composite ceramic membrane and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1686902A (en) * 2005-04-22 2005-10-26 东南大学 Attapulgite additive for compound mortar

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CN1686902A (en) * 2005-04-22 2005-10-26 东南大学 Attapulgite additive for compound mortar

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Title
李利: "拜耳法赤泥干混砌筑砂浆的配制及性能研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 01, 15 January 2012 (2012-01-15), pages 46 - 48 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104944828A (en) * 2015-06-19 2015-09-30 阚春明 Cement-based high-molecular polymer waterproof mortar additive and preparation method and application thereof
CN104944828B (en) * 2015-06-19 2017-05-17 阚春明 Cement-based high-molecular polymer waterproof mortar additive and preparation method and application thereof
CN111825377A (en) * 2020-06-01 2020-10-27 金华市中天城建绿色再生资源有限公司 Method for manufacturing brick-concrete fully-regenerated dry-mixed mortar
CN114133175A (en) * 2021-12-31 2022-03-04 上海力阳道路加固科技股份有限公司 Red mud-based polymer color mortar and preparation method thereof
CN114133175B (en) * 2021-12-31 2023-03-17 上海力阳道路加固科技股份有限公司 Red mud-based polymer color mortar and preparation method thereof
CN115974527A (en) * 2022-12-30 2023-04-18 中南大学 Fly ash-red mud-based composite ceramic membrane and preparation method thereof

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