CN1128118C - Preparation and application of high-performance concrete admixture - Google Patents
Preparation and application of high-performance concrete admixture Download PDFInfo
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- CN1128118C CN1128118C CN01114790A CN01114790A CN1128118C CN 1128118 C CN1128118 C CN 1128118C CN 01114790 A CN01114790 A CN 01114790A CN 01114790 A CN01114790 A CN 01114790A CN 1128118 C CN1128118 C CN 1128118C
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present invention relates to a making method and the application of a concrete admixture with high performance. Limestone is used as a main material and ground into powdery materials of a certain specific surface area, a small amount of gypsum and slag can be mixed to improve a performance function, and raw materials have certain quality requirements. The present invention has a process that after the limestone and the gypsum are broken, the limestone and the gypsum are respectively measured with the slag, and the concrete admixture with high performance is formed by controlling certain fineness and the specific surface area after being milling. The admixture can be used for making concrete. When the concrete of the same mark number is made, cement within 30% can be replaced, and an excess substitution factor is from 1.1 to 1.4. The present invention has the advantages of simple production process, wide raw material source, low power consumption and low cost, and the made concrete has the advantages of high flexural strength, high early anti-compression strength, small dry shrinkage value, low hydration heat, favorable impervious performance and carbonation resisting performance, etc.
Description
The present invention is a kind of preparation method and application thereof of high-performance concrete additive, belongs to the production and the utilisation technology of concrete admixture.
Along with developing rapidly of concrete technology and concrete industry, as the 6th component in the component materials of concrete---the effect of fine adulterant and the attention that the status is subjected to investigation of materials and production department day by day.Fine adulterant mixed in the concrete as a kind of gathering materials, and mainly played a part three aspects: (1) diminishing effect, (2) filling effect, (3) active effect.Use adulterant can reduce concrete production cost, improve concrete serviceability and mechanical property, reduce hydration heat of concrete, improve volume stability of concrete and endurance quality.The kind of present domestic adulterant is more, and flyash, fine mill slag, silicon ash, zeolite powder etc. are arranged.The effect of various mineral admixtures in concrete is roughly the same, but price differs bigger.Silicon ash source is less, and price is at 3000～12000 yuan/ton; The fine grinding zeolite powder has very big inner ratio surface area, easily causes the increase of unit consumption of water when mixing concrete; The fine mill slag power consumption is higher, causes use cost office high not down.The flyash of arranging is done in the fuel-burning power plant that still belongs to of consumption maximum.The quality of flyash is if can be up to state standards the I of regulation, the requirement of II level ash, and its action effect in concrete is very obvious.But for system ash or III level ash, because its water demand ratio is bigger, loss on ignition is big or fineness is thicker, influences its diminishing, filling and active effect, and often effect is relatively poor.Guangzhou commerical ready-mixed concrete industry development is rapid, and there is tame commerical ready-mixed concrete stirring station more than 40 whole city, and yearly capacity 420 ten thousand stere concrete are pressed flyash and replaced cement 20% calculating, about 300,000 tons of year consumption flyash.Because electric power resource is limited near the Guangzhou, annual ash discharge amount is difficult to satisfy the demand of commerical ready-mixed concrete industrial development, and from now on, country carries out transferring electricity from the west to the east, the possibility of building power plant again is less, and along with the boiler of power plant prolongation of working life, burning quality descends, calcining is insufficient etc., and the quality of flyash will progressively descend.Just at present, the supply of Guangzhou I, II level flyash is very limited, and what most of commerical ready-mixed concrete stirring station used is system ash or III level flyash, and the quality fluctuation of ash is bigger, easily causes the quality fluctuation of commerical ready-mixed concrete.Maintenance of annual big power plant or concrete productions busy season, even unite ash or III level flyash, it is under-supply still can flyash to occur, and commerical ready-mixed concrete stirring station production cost such as significantly improves at problem.The mankind enter 21 century, need further Sustainable development, are faced with population expansion, environmental degradation and shortage of resources three big problems.Material science and technology will obtain Sustainable development, except the technical and economy to material claims, also require it to have environment compatibility, that is to say need be from economizing the angle development novel material of the energy, resource-saving, high-durability and regeneration.Two important directions of current concrete technology development are: the one, and the development high-strength high-performance concrete, i.e. HPC (highperformance concrete), the 2nd, make the normal concrete high performance, make extend to 60～70 years its work-ing life by 40～45 years.Concrete is multi-functional high efficiency water reducing agent and high performance adulterant along the basic substance of this both direction development.
Purpose of the present invention be exactly for overcome and solve that the fine adulterant of existing concrete has have very big inner ratio surface area, to mix concrete hourly water consumption increase grinding pow consumption too big, that have higher, use cost is high; The own quality fluctuation that has is bigger, and easily cause concrete quality fluctuation or raw material sources that the shortcoming and the problem of problem etc. are arranged, the preparation and the application thereof of a kind of high-performance concrete additive of research invention, it is to be main raw material with the Wingdale, can compound a small amount of gypsum, through grinding processing, control the powder material that certain fineness and specific surface area are prepared from; This concrete admixture can improve concrete serviceability, improves concrete anti-folding and early stage ultimate compression strength, reduces concrete dry shrinkage, reduces concrete hydration heat, is the good material that realizes the normal concrete high performance; Compound a small amount of fine mill slag on the basis of razor stone lime stone high-performance adulterant also can be produced the serial adulterant product that is applicable to high-strength high-performance concrete.Starting material wide material sources of the present invention, production technique is simple, constant product quality is controlled, production cost is low, is used for concrete batching, can improve its performance, reduces concrete production cost.
The present invention realizes by following technical proposals: the preparation method of this high-performance concrete additive is to be main raw material with the Wingdale, compound a small amount of gypsum and slag are through grinding processing, control certain fineness and specific surface area, be prepared into powder material, the mass percent of three kinds of materials is:
Wingdale: 50～100%
Gypsum: 0～8%
Slag: 0～50% in above-mentioned formula range, can produce the not high-performance concrete additive series product of same-action, as: coventional type LS-FA (Wingdale 95～100%, gypsum 0～5%) and high strong type LS-FA (Wingdale 50～95%, gypsum 0～8%, slag 5～50%); Quality requirements of raw materials: Wingdale CaO, MgO content do not limit, aluminium sesquioxide Al
2O
3Content is less than 2.5%; Sulphur trioxide SO in the gypsum
3Content 25～45%; The slag alkali property coefficient is greater than 1; Its production technique is: Wingdale, gypsum measure respectively with slag after fragmentation, and again through grinding, controlling its fineness is 0.045mm square hole sieve screen over-size≤20%, SO
3Content 0～3.0%, specific surface area are 330～600m
2/ kg; The high-performance concrete additive of producing by above-mentioned preparation method has been tentative to be applied to the concrete production of construction work, and receive the desired result of the object of the invention, coventional type LS-FA is when preparing with the label concrete, can replace 30% with interior cement, the excess substitution index is 1.1～1.4, the every performance of the concrete of being prepared all is better than normal concrete (with the concrete of label plain cement preparation), makes the normal concrete high performance; High strong type LS-FA, promptly on limestone content reaches 50～95% basis, compound again 0～8% gypsum and 5～50% slag, can be used for preparing the high-strength concrete of the above strength grade of C50, compare with normal concrete, also can replace 30% with interior cement, the excess substitution index is 1.1～1.4; This series adulterant has diminishing effect, filling effect and active effect, can improve the serviceability of concrete mix, improve concrete flexural strength and early stage ultimate compression strength, reduce concrete hydration heat, reduce concrete contraction, significantly reduce the crack on concrete phenomenon; In addition, the application of this adulterant also can reduce concrete production cost, reaches the object of the invention fully.
The contriver is from the mechanism of action of research adulterant concrete, through the laboratory study test, invent razor stone lime stone (LS-FA:lime-stone-Fine-aggregate) as concrete high-performance adulterant, and studied the successfully preparation method and the application thereof of this high-performance concrete additive.And dropped on experimental production and the engineering on probation.When this adulterant is that prepared concrete admixture is coventional type LS-FA, can be used for preparing the concrete of the following strength grade of C50 with Wingdale 95～100%, when gypsum 0～5% is prepared burden; When the high-grade concrete of preparation more than the C50, slag that can compound again 5～50% just can be produced high strong type LS-FA adulterant, can meet the demands.This adulterant can be made and be applicable to the concrete adulterant series product of various strength grades according to market demand.From experimental result repeatedly, this kind adulterant is better than normal concrete to the effect of concrete serviceability, mechanical property and endurance quality, and early anti pressured intension, folding strength and concrete anti-contracility can be better than the concrete with the preparation of II level flyash.The effect of this adulterant in concrete is mainly reflected in: (1) water requirement own is little, has certain diminishing effect; (2) fine particles has good filling effect, helps making concrete interface structure more closely knit, can improve concrete folding strength, anti-permeability performance and reduce concrete dry shrinkage cracking; (3) the chemically reactive effect of Wingdale is mainly reflected in early days, and the lime carbonate in the Wingdale can generate aquation carbon aluminate with the hydrated product of cement, can significantly improve concrete early anti pressured intension; (4) can reduce concrete hydration heat, replace 30% with interior cement with the razor stone lime stone during concrete batching, can reduce concrete hydration heat significantly, reduce concrete shrinkage cracking.In addition, because the Wingdale grindability is good, grinding pow consumption is lower, good stability, and quality fluctuation is little, replaces 30% with interior concrete made of cement with it, can improve concrete every performance, can reduce concrete production cost significantly again.
The present invention compared with prior art, have following advantage and beneficial effect: (1) the present invention mixes razor stone limestone flour (limestone content can reach 95～100%) among the normal concrete in a large number as a kind of fine adulterant, it replaces cement amount and can reach in 30%, the every performance of the concrete of being prepared is better than the normal concrete with the preparation of label plain cement, even the performance of normal concrete improves, reduced concrete production cost again; (2) the present invention reaches in limestone content on 50～95% the basis, compound 0～8% gypsum and 5～50% slag, can produce the series product of high strong type LS-FA, be used to prepare high-strength high-performance concrete, replace 30% with interior cement, every performance of institute's concrete batching is better than satisfying the requirement of high-strength and high performance with the label normal concrete; (3) the present invention can be the product application of coventional type and high strong type LS-FA in the concrete of actual construction work, and through sampling Detection repeatedly, every performance all reaches the requirement of engineering; (4) production technique of the present invention is simple, the starting material wide material sources; (5) to compare grinding pow consumption low for the concrete admixture of the present invention preparation and fine mill slag, and production cost is lower; (6) concrete admixture of the present invention's preparation is compared with flyash, and constant product quality is controlled, and the early anti pressured intension of concrete batching, folding strength and anti-contracility can be more good; (7) with the concrete of the adulterant preparation of the present invention preparation with compare with the label normal concrete, have the early strength height, folding strength height, advantage such as the dry shrinkage value of concrete is little, and the low and anti-permeability performance of hydration heat, anti-carbonation properties are good.
The contriver is through years of researches and scientific experiment, the embodiment that has the examination of a lot of successful testing laboratories and engineering to use, and, the adulterant of the inventive method preparation has been praised 600 tons of magnificent cement mill trial productions in the Guangzhou, wherein (proportioning is coventional type LS-FA: Wingdale 98%, gypsum 2%) 300 ton, (proportioning is high strong type LS-FA: Wingdale 64%, gypsum 6%, slag 30%) 300 ton, and successfully try to be applied to actual construction work in garden, Guangzhou east municipal administration concrete company limited, respectively in Guangdong Province supply and marketing cooperative engineering and the engineering construction of TV university tall building, Guangdong with nearly 1000 cubic metres of the commerical ready-mixed concrete of LS-FA high-performance adulterant preparation, strength grade of concrete is C20～C50, produce with unit in charge of construction satisfied to this batch quality of concrete, serviceability adapts to construction requirement fully, and the Performance Detection that building-site keeps sample all reaches design requirements.Only enumerating following several embodiment below illustrates:
Embodiment 1:
The contriver prepares the concrete test-results of C30 shown in table 1～2 with the series product A13 of the coventional type SL-FA high-performance adulterant of the present invention's preparation: (the adulterant prescription of numbering A13 is: 98% Wingdale, 2% gypsum; Specific surface area is 350m
2/ kg)
Table 1: test used starting material and concrete mix
| Test materials | Cement | Water | Sand | 5-16mm stone grain | 5-25mm stone grain | FDN-5 (water reducer) | Adulterant | ||
| Flyash | LS-FA | ||||||||
| The place of production, the trade mark | Zhujiang River factory Guangdong show board | Tap water | The north rivers | Hope Gang Shichang | Hope Gang Shichang | Zhanjiang admixture factory | Guangzhou power plant | A13 | |
| Kind, grade | PII.42.5R | / | Fineness modulus Mx=2.3 | / | / | Efficient retarding and water reducing agent | The system ash | / | |
| Adulterant and concrete mix (Kg/m 3) | Flyash | 287 | 203 | 751 | 120 | 923 | 5.02 | 99 | / |
| A13 | 287 | 195 | 751 | 120 | 923 | 5.02 | / | 99 | |
| Normal concrete cooperates (Kg/m 3) | 363 | 200 | 725 | 120 | 923 | 5.02 | / | ||
Table 2: the concrete of being joined with Guangzhou fly ash in electric power plant, A13 adulterant and the comparative test result of normal concrete
| Sample | Mobile (mm) | Unit weight (kg/m 3) | Workability is described | Ultimate compression strength (Mpa) | Folding strength (Mpa) | Anti-penetration grade | ||||
| Slump | Divergence | 3d | 7d | 28d | 7d | 28d | ||||
| Flyash | 165 | 290 | 2335 | Starch thicker | 17.4 | 25.5 | 37.4 | 2.4 | 3.3 | S9 |
| A13 | 180 | 370 | 2405 | Starch thicker | 23.1 | 33.1 | 40.2 | 3.1 | 4.2 | S9 |
| Normal concrete | 145 | 260 | 2420 | Starch thicker | 19.8 | 27.9 | 38.8 | 2.5 | 3.4 | S7 |
By above-mentioned experimental result as can be seen: (1) LS-FA adulterant has better diminishing effect, under the little situation of unit consumption of water, initial slump and divergence are greater than normal concrete, the concrete that also is better than the flyash preparation, show better flowing property, if guaranteeing also can to reduce water cement ratio under the serviceability condition identical with normal concrete; (2) the LS-FA adulterant is joined concrete ultimate compression strength performance and obviously is better than normal concrete, and 3d (3 days) intensity improves 3.3Mpa, and 7d intensity improves 5.2Mpa, and 28d intensity improves 1.4Mpa; The folding strength increase rate is also bigger, and the 7d folding strength improves 0.6Mpa, improves 24% than normal concrete, and the 28d folding strength improves 0.8Mpa, improves 23.5% than normal concrete.And, the concrete that its resistance to compression and folding strength are all prepared apparently higher than flyash; (3) anti-permeability performance is better than normal concrete.
Embodiment 2
(prescription of numbering A12 is the contriver: Wingdale 64%, gypsum 6%, slag 30%, specific surface area 370m with the series product A12 of the high strong type LS-FA high-performance concrete additive of the present invention preparation
2/ kg) prepare C60 concrete test result shown in following table 3～table 5:
Table 3. used starting material of test and concrete mix
The comparative test result of the A12 adulterant concrete batching of table 4. normal concrete and the present invention's preparation
| Sample | Slump (mm) | Unit weight (kg/m 3) | Workability is described | Ultimate compression strength (Mpa) | Folding strength (Mpa) | Anti-penetration grade reach S12 on average seep water the height (cm) | ||||
| oh | 1.0h | 3d | 7d | 28d | 7d | 28d | ||||
| Normal concrete | 17.0 | 13.5 | 2430 | Workability is better | 48.8 | 53.0 | 67.6 | / | 6.3 | 2.4 |
| A12 | 20.0 | 17.5 | 2430 | Workability is good | 50.8 | 59.1 | 69.0 | / | 6.7 | 2.1 |
The contraction test comparing result of the A12 adulterant concrete batching of table 5. normal concrete and the present invention's preparation
| Sample | Drying shrinkage value 1 * 10 -6(mm) | |||||
| 3d | 7d | 28d | 45d | 60d | 90d | |
| Normal concrete | 180 | 300 | 470 | 480 | 490 | 500 |
| A12 | 27 | 180 | 340 | 360 | 393 | 440 |
By above-mentioned test-results as can be seen: the concrete initial slump of high strong type LS-FA adulterant preparation C60 is bigger than normal concrete, after 1 hour the loss of slump littler than normal concrete, serviceability is better than normal concrete.Concrete 3 days, 7 days, 28 days pressure resistance height, 28 days folding strength height, anti-permeability performance is good, and the drying shrinkage value of 90 days inner concretes is all less than normal concrete, and early stage contraction is littler.
Embodiment 3
(prescription of numbering A13 is the test-results that the contriver uses in the engineering pilot scale with series product A13, the A12 of the LS-FA high-performance adulterant of the present invention preparation: Wingdale 98%, gypsum 2%, specific surface area 350m
2/ kg; The prescription of numbering A12 is: Wingdale 64%, gypsum 6%, slag 30%, specific surface area 370m
2/ kg) shown in table 6～9.
TV university tall building, table 6. Guangdong engineering C35 pump concrete material therefor and concrete mix
| Material | Silk cotton P042.5R cement | Adulterant A13 | River, Xijiang River sand (II grating district, fineness modulus Mx=2.4) | Good Hua Shi (particle diameter 5～16m) | The AP-1 admixture | Water |
| Proportioning (kg/m 3) | 290 | 120 | 704 | 1101 | 8.20 | 185 |
TV university tall building, table 7. Guangdong building-site detected result that keeps sample
| Slump when going out stirring station (mm) | Slump (mm) during to building-site | The building site workability is described | 7d ultimate compression strength (Mpa) | 28d ultimate compression strength (Mpa) |
| 200 | 185 | Workability is good | 34.2 | 47.2 |
Table 8. Guangdong Province supply and marketing cooperative building site C50 concrete material therefor and concrete mix
| Material | Silk cotton P042.5R cement | Adulterant A12 | River, Xijiang River sand (II grating district, fineness modulus Mx=2.4) | Good Hua Shi (particle diameter 5～16m) | The AP-1 admixture | Water |
| Proportioning (kg/m 3) | 345 | 95 | 690 | 1084 | 11.20 | 175 |
The table 9. Guangdong Province supply and marketing cooperative building-site detected result that keeps sample
| Slump when going out stirring station (mm) | Slump (mm) during to building-site | The building site workability is described | 7d ultimate compression strength (Mpa) | 28d ultimate compression strength (Mpa) |
| 180 | 160 | Workability is good | 46.2 | 59.2 |
By table 6～9 as can be seen, better with the effect that the adulterant of the present invention preparation is used in the engineering pilot scale, the serviceability of the commerical ready-mixed concrete of preparing with the series product of this adulterant, the requirement that mechanical property can reach engineering design and construction fully.
Claims (2)
1, a kind of preparation method of high-performance concrete additive is characterized in that: with the Wingdale main raw material, and compound a small amount of gypsum and slag, process through grinding, control certain fineness and specific surface area are prepared into grinding shape material, and the weight percent of three kinds of materials is:
Wingdale: 50～100%
Gypsum: 0～8%
Slag: 0～50% in above-mentioned formula range, can produce the not high-performance concrete additive series product of same-action, coventional type LS-FA, be Wingdale 95～100%, gypsum 0～5% and high strong type LS-FA, is Wingdale 50～95%, gypsum 0～8%, slag 5～50%; Quality requirements of raw materials: calcium oxide CaO, magnesium oxide MgO content do not limit aluminium sesquioxide Al in the Wingdale
2O
3Content is less than 2.5%; Sulphur trioxide SO in the gypsum
3Content 25～45%; The slag alkali property coefficient is greater than 1; Its production technique is: Wingdale, gypsum measure respectively with slag after fragmentation, and again through grinding, controlling its fineness is 0.045mm square hole sieve screen over-size≤20%, SO
3Content 0～3.0% and specific surface area are 330～600m
2/ kg.
2, can be used to concrete batching by the prepared concrete admixture of the preparation method of the described high-performance concrete additive of claim 1, coventional type LS-FA adulterant is when preparing with the label concrete, can replace 30% with interior cement, the excess substitution index is 1.1～1.4, the every performance of the concrete of being prepared all is better than normal concrete, makes the normal concrete high performance; High strong type LS-FA adulterant, promptly on limestone content reaches 50～95% basis, compound again 0～8% gypsum and 5～50% slag, can be used for preparing the strong concrete of the above strength grade of C50, can replace 30% with interior cement, the excess substitution index is 1.1～1.4, and the every performance of the concrete of being prepared all is better than normal concrete, reaches the high-strength and high performance requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01114790A CN1128118C (en) | 2001-06-12 | 2001-06-12 | Preparation and application of high-performance concrete admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01114790A CN1128118C (en) | 2001-06-12 | 2001-06-12 | Preparation and application of high-performance concrete admixture |
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|---|---|
| CN1322690A CN1322690A (en) | 2001-11-21 |
| CN1128118C true CN1128118C (en) | 2003-11-19 |
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| CN01114790A Expired - Fee Related CN1128118C (en) | 2001-06-12 | 2001-06-12 | Preparation and application of high-performance concrete admixture |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004018967A (en) * | 2002-06-18 | 2004-01-22 | Chugai Ro Co Ltd | Heat treatment furnace |
| CN1326795C (en) * | 2004-02-26 | 2007-07-18 | 同济大学 | Addition for concrete of road for enhacing anti-bending strength |
| CN101774790B (en) * | 2010-01-31 | 2013-02-06 | 湖南大学 | Cement admixture and method for promoting concrete curing with carbon dioxide |
| CN104140288B (en) * | 2013-05-08 | 2016-05-18 | 中国核工业二四建设有限公司 | A kind of used in nuclear power station self-compacting concrete compounded mineral admixture preparing process |
| CN103803817A (en) * | 2013-12-19 | 2014-05-21 | 马钢(集团)控股有限公司 | Method for preparing industrial composite micro powder by use of waste impurity-containing limestone dust |
| CN109180041B (en) * | 2018-09-25 | 2020-12-15 | 沿河土家族自治县乡建商品混凝土有限责任公司 | Method for preparing limestone powder by using waste building concrete |
| CN110845168A (en) * | 2019-12-10 | 2020-02-28 | 徐州中联混凝土有限公司 | Active admixture, preparation method and application of active admixture and concrete |
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