CN103771801B - A kind of be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof - Google Patents
A kind of be mixed with Bayer process red mud be dry mixed ground mortar and using method thereof Download PDFInfo
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- CN103771801B CN103771801B CN201410003868.7A CN201410003868A CN103771801B CN 103771801 B CN103771801 B CN 103771801B CN 201410003868 A CN201410003868 A CN 201410003868A CN 103771801 B CN103771801 B CN 103771801B
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- red mud
- bayer process
- process red
- mixed
- mortar
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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 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.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.Product of the present invention has good fluidity, good water-retaining property, glutinous poly-property are 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 is applicable to carry out levelling to building flooring, plays a part protection and decoration.The present invention effectively can utilize Bayer process red mud, improves the value added of Bayer process red mud, improves social benefit; Reduce the production cost of ground mortar simultaneously, increase economic efficiency.
Description
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, to building materials quality, stable and energy-conserving and environment-protective are had higher requirement.As one of most important material of construction, the appearance of premixing mortar (i.e. commodity mortar) solves traditional mortar extemporaneous preparation and stirs the problems such as the labour intensity caused 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 class.Majority is dry mixed ground mortar poor fluidity in the market, and easy to crack, intensity is low, and shrink large, cost is high, and these problems limit 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, the adulterant slag powders of high-quality and flyash in the market, what occurred in various degree in some regions is in short supply.
Bayer process red mud uses 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 pureed solid waste.Data is had 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 produced is tens million of ton, 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
3red mud is mostly delivered to stockyard by factory, relies on mountain valley or excavation farmland wet method of building a dam to store up, takies a large amount of land resources, cause soil and water to pollute.The chemical composition of red mud and mineral composition because of the material composition of the additive in the composition of bauxite, production technique (sintering process, mixed combining method or Bayer process), production process different with newly-generated chemical composition and change to some extent.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 with mixed combining method red mud with red mud from sintering process, Fe in the chemical composition of Bayer process red mud
2o
3and Al
2o
3content is high, Fe
2o
3about 28%, Al of total amount can be reached
2o
3for about 17% of total amount, alkali content and CaO content 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 little, does 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 propose 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) μm, and the specific surface area that N2 adsorption measures 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) μm, and the specific surface area that N2 adsorption measures 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 μm.
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 what the present invention proposed be mixed with Bayer process red mud is dry mixed ground method for preparing mortar, and concrete steps are as follows:
Ordinary Portland cement, Bayer process red mud, flyash, ether of cellulose, attapulgite modified, re-dispersible glue powder, water reducer, defoamer, retardant and river sand is accurately taken in aforementioned weight ratio, drop into dry mixing device, after even by mechanical stirring, obtain desired product.
A kind of using method being dry mixed ground mortar being 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 stirrer, along with blade of stirrer rotates, the ground mortar that is dry mixed being mixed with Bayer process red mud is at the uniform velocity dropped into stirrer.Can construct after stirring.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 being 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
3about 28%, Al of total amount can be reached
2o
3for about 17% of total amount, alkali content and CaO content 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, the extent of hydration of cement can be made to be improved, the increase of hydrated product improves the Connected degree between hardened paste, thus improves the intensity of mortar, especially early strength.Secondly, Bayer process red mud has higher surfactivity because its particle diameter is little and specific surface area is large, and water molecules that can be free in active adsorption mixture, effectively can improve the serviceability of mortar mixture.In addition, Bayer process red mud powder hole is many, need water than the feature of high, strong retentiveness, the water requirement of Bayer process red mud ground mortar mixture to be increased, and relatively improves the water retention property of mixture.
Pulverized burned coal ash hydration process is relatively slower, and early activity is lower, and the golden period of development of its intensity is after 28d.Meanwhile, although there is a large amount of aluminium silicate minerals in flyash, because wherein [SiO
4]
4-tetrahedral polymerization degree is high, so activity is lower.Flyash is natural, and in acid, its activeconstituents can be excited in the basic conditions, and Bayer process red mud is in alkalescence, can excite the pozzolanic activity of flyash.Hydrated product calcium hydroxide (the Ca (OH) of the aquation of flyash mainly flyash and cement
2) between reaction, influence each other with the aquation of cement, mutually promote.
Of the present invention to be dry mixed in the mortar of ground ordinary Portland cement, Bayer process red mud and flyash three kinds of gelling material with the use of, play composite cementitious material, 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 defect of gelling system later strength difference, this three is just formed " echelon " of a strength development, that Bayer process red mud and cement provide intensity in early days, later stage is that coal ash lifting is for intensity, the structure this ensures that thering 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: the reaction being Bayer process red mud and cement on the one hand, and this reaction facilitates 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 connects each other interactional, and Bayer process red mud is promoting the aquation also promoting flyash while hydrated cementitious.
In the present invention, ether of cellulose and attapulgite modified be the water-keeping thickening material being dry mixed ground mortar, toughness and the water-retentivity of mortar can be improved.
After ether of cellulose in mortar dissolves in water, because surface-active action ensure that gelling material is effectively uniformly distributed in system, make mortar more stable.Ether of cellulose, as high polymer long chain material, after adding cement cementitious system, makes the moisture in mortar not easily lose, and progressively discharges within long period of time, gives the good water-retentivity of mortar and workability.Meanwhile, ether of cellulose is also a kind of stablizer, can prevent the segregation of mortar and the disadvantageous effect of top layer peeling.
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, can wrap up the macrobeads such as sand thus the sedimentation preventing sand in mortar.Attapulgite modified viscosity, water retention and the thixotropy that can improve mortar.
In the present invention, re-dispersible glue powder add folding strength, cohesive strength and the wearability that can improve mortar, the shrinking percentage of mortar can be reduced.Cement and these two kinds of components of 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 is that whole system provides stability and security.
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 adjust 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 are 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 Bayer process red mud be made full use of, turn waste into wealth, reduce ground mortar preparation cost, increase economic efficiency; Meanwhile, Bayer process red mud can also be alleviated and stack the environmental pollution and land wastage problem that process and bring; In addition, the application of Bayer process red mud in the mortar of ground, also can alleviate the problem that high-quality blended material is in short supply in the market.
Embodiment
The present invention is further illustrated 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 by 10% of dry-mixed masonry mortar total mass and stir, 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 by 12% of dry-mixed masonry mortar total mass and stir, 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 by 15% of dry-mixed masonry mortar total mass and stir, 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 (3)
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;
Wherein: described ordinary Portland cement is 42.5 grades of ordinary Portland cements; Described Bayer process red mud particle diameter is (5-15) μm, and the specific surface area that N2 adsorption measures is (10000-20000) m
2/ kg, quality coefficient K are 1.1-1.6; The particle diameter of described flyash is (35-45) μm, and the specific surface area that N2 adsorption measures is (300-550) m
2/ kg, quality coefficient K are 1.2-1.7; Described ether of cellulose is hydroxymethyl-propyl cellulose ether, and its viscosity is 10000mPa ﹒ s; Described attapulgite modified fineness is (200-300) order; Described re-dispersible glue powder is vinyl acetate and ethylene copolymer rubber powder, and its median size is 400 μm; Described water reducer is poly carboxylic acid series water reducer, and described defoamer is silicone antifoam agent, and described retardant is hydroxycarboxylate's organism, and described river sand is medium sand, and fineness modulus is 2.3-2.5, and tap density is (1250-1450) kg/m
3.
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. a kind of using method being dry mixed ground mortar being mixed with Bayer process red mud as claimed in claim 1, amount of water when it is characterized in that construction application is the 10%-15% being dry mixed ground mortar total mass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003868.7A CN103771801B (en) | 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 |
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|---|---|---|---|
| CN201410003868.7A CN103771801B (en) | 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 |
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|---|---|
| CN103771801A CN103771801A (en) | 2014-05-07 |
| CN103771801B true CN103771801B (en) | 2015-11-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Citations (1)
| 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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2014
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Patent Citations (1)
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 拜耳法赤泥干混砌筑砂浆的配制及性能研究;李利;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20120115(第01期);第46-48页 * |
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