CN103145360A - Viscosity modifier for high or ultrahigh-strength concrete - Google Patents
Viscosity modifier for high or ultrahigh-strength concrete Download PDFInfo
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- CN103145360A CN103145360A CN2013100658878A CN201310065887A CN103145360A CN 103145360 A CN103145360 A CN 103145360A CN 2013100658878 A CN2013100658878 A CN 2013100658878A CN 201310065887 A CN201310065887 A CN 201310065887A CN 103145360 A CN103145360 A CN 103145360A
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Abstract
The invention relates to a viscosity modifier for high or ultrahigh-strength concrete. The viscosity modifier comprises the following substances in percentage by weight: 2-10% of silica fume, 10-20% of pulverized coal ash, 2-3% of exciting agent and 67-86% of ultrafine powder. The viscosity modifier added into the high or ultrahigh-strength concrete at a ratio of 10-30% can reduce the viscosity of the concrete by 25-60%. By optimizing the particle size distribution of cementitious materials, the bulk density can be increased, the thicknesses of water film layers on the surfaces of particles in a cementitious system can be increased, the adsorption efficiency of a water reducing agent can be improved, the use amount of the water reducing agent can be reduced, and the viscosity of an aqueous solution in concrete can be lowered. Due to the morphology of powder particles and the action of charges on the surfaces of the powder particles, the interaction force of the particles can be reduced, the viscosity of the concrete can be lowered, and the strength of the concrete can not be affected. The viscosity modifier can be also used for a mortar system with low water-cement ratio.
Description
Technical field
The present invention relates to a kind of auxiliary for material of construction, belong to the concrete admixture class, be specifically related to a kind of concrete viscosity conditioning agent that can significantly reduce high-strength or super high strength concrete viscosity.
Background technology
Along with the civil engineering work scale constantly enlarges, scientific and technological level improves constantly, some high-rise long spans, the continuous appearance of the Important building that specific function requires is arranged, as construction of skyscraper, super-span bridge and huge water-control project etc., require concrete must have higher intensity, better weather resistance, more excellent stability, these demands have facilitated concrete progressively to develop to high-performance and even very-high performance direction from common.The raising of concrete strength mainly recently realizes by reducing glue, and this has also caused concrete viscosity larger, causes a series of construction problems such as concrete-agitating, transportation, pumping, limited to a great extent high-strength and propagation and employment super high strength concrete.High-strength particularly super high strength concrete is used for prefabricated components basically at present, and the application example of large scale structure engineering does not substantially also have, let alone pumping construction.
How to reduce concrete viscosity and become key issue high-strength and the super high strength concrete development.From high-strength and composition and preparation method super high strength concrete, present adoptable viscosity reducing process is mainly to carry out from organic admixture and adulterant two aspects.Yet still unintelligible to the concrete viscosity mechanism of action about water reducer, the research and development of organic viscosity-depression agent also do not occur the Patents of the organic viscosity-depression agent of concrete at present still without breakthrough; And the adulterant aspect does not have to occur patent or article about the concrete viscosity-depression agent equally, mainly to improve the concrete work performance by mixing a large amount of flyash at present, mix as everyone knows that flyash can reduce concrete viscosity but larger to concrete intensity effect, totally unfavorable for lifting high-strength or ultra-high performance concrete intensity, and fly ash is also day by day deficient, and the novel viscosity modifier of therefore needing the development excellent property badly reduces the viscosity of high-strength or super high strength concrete.
Summary of the invention
The objective of the invention is for present high-strength or super high strength concrete viscosity large, construction is difficult shortcoming, a kind of high-strength or super high strength concrete viscosity modifier is proposed, can effectively lower concrete viscosity, and have that consumption is few, cost is low and on intensity without characteristics such as impacts.
The applicant finds after deliberation: particle surface water film thickness principal reaction water consumption, packing density and the total specific surface area three aspects: of particle information; Surface water thicknesses of layers and concrete viscosity are closely related, and particle surface water film thickness is larger, and concrete viscosity is lower; Major cause high-strength or that super high strength concrete viscosity is large is that the particle Interaction Force is large because low water binder ratio has caused particle surface water film thickness little.
Based on above-mentioned research, the present invention maximizes viscosity-reducing machine with water film thickness and is made as the basis, silicon ash, superfine powder and flyash by admixture different-grain diameter scope are optimized the gelling material grain composition, make packing density increase and can not cause that the surface-area of gelling material increases substantially, and has namely increased the water layer thickness of particle surface as far as possible; And because superfine powder can improve the admixture adsorption efficiency, reduce the admixture consumption, reduce solution viscosity in concrete, and because pattern effect and the surface charge effect of powder granule reduced the particle Interaction Force, caused concrete viscosity further to reduce.Because the particle packing degree of compactness increases, this viscosity modifier can't cause the reduction of concrete strength.
Concrete technical scheme of the present invention is as follows:
A kind of high-strength or super high strength concrete viscosity modifier is made of by mass percentage following material:
Silicon ash 2% ~ 10%;
Flyash 10%-20%;
Exciting agent 2% ~ 3%;
Superfine powder 67% ~ 86%.
The median size of described silicon ash is 0.1 μ m～0.3 μ m, silicon ash in this particle size range is other intergranular spaces such as filling concrete, flyash and fine powder effectively, improve the matrix density, be conducive to the release of free water in the space and the raising of concrete strength, in addition the high pozzolanic activity of silicon ash can further improve concrete strength.
The fineness of described flyash is preferably 45 μ m square hole sieve screen over-size＜10%, and its fineness meets the requirement of I level flyash, has not only optimized grain composition, and because the ball effect can reduce intergranular friction power, improves concrete rheological property.
Described exciting agent is selected from a kind of in calcium hydroxide, sodium carbonate, calcium oxide or calcium sulfate, and above-mentioned exciting agent can significantly improve the adulterant activity, improves concrete strength.
One or more arbitrary proportions that described superfine powder is selected from super finely ground slag, limestone powder, silica powder mix; Above-mentioned powder has good hydrophilic property, the characteristics of easily disperseing, and can significantly improve the water reducer adsorption efficiency, effectively improve concrete rheological property.
The median size of described superfine powder is 2 μ m～10 μ m, and its particle diameter is between silicon ash and cement granules, but the Effective Regulation grain composition, and this particle size range superfine powder is on the impact of water reducer adsorption efficiency significantly.
The present invention optimizes the gelling material grain composition by silicon ash, superfine powder and the flyash of the above-mentioned different-grain diameter scope of admixture, makes packing density increase and can not cause that the surface-area of gelling material increases substantially.
Viscosity modifier of the present invention only needs each component materials is mixed to get final product, and prepares simplely, is convenient to promote the use of.
During use, the quality such as high-strength or super high strength concrete viscosity modifier of the present invention replace cement and join in concrete gel material, and its add-on accounts for 10% ~ 30% of concrete gel material total mass, can make concrete viscosity reduce by 25% ~ 60%.
The present invention improves packing density by optimizing the gelling material grain composition, increased the water layer thickness of gelling system particle surface, improved the adsorption efficiency of admixture, reduce the consumption of admixture, reduced solution viscosity in concrete, and because pattern effect and the surface charge effect of powder granule reduced the particle Interaction Force, and then caused the concrete viscosity reduction.Can improve packing density because viscosity modifier of the present invention contains sub-micron-powder, and superfine powder has certain activity, therefore mixing this viscosity modifier can not reduce concrete strength.Viscosity modifier of the present invention is equally applicable to the low water binder ratio mortar.
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
The median size of " silicon ash " in embodiment is 0.18 μ m.
The fineness of " flyash " in embodiment is 45 μ m square hole sieve screen over-size＜10%.
The median size of " superfine powder " in embodiment is 2 μ m～10 μ m.
" sand glue ratio " in embodiment refers to the mass ratio of mortar medium sand and gel material content.
Concrete of the present invention passing through in the V funnel stipulates in basis of time " self-compacting concrete utilisation technology rules " CECS203-2006 that carrying out the V funnel measures by the time test method.
The viscosity of mortar of the present invention is tested by mortar rheometer (the soft solid test body rheometer of the R/S-SST that Brookfield company produces).
The testing method of mortar divergence of the present invention adopts existing testing method, the back cut diameter 70mm of the truncated cone mould of the inner wall smooth that it uses, lower port diameter 100mm, high 60mm.
Embodiment 1
A kind of high-strength or super high strength concrete viscosity modifier is mixed by mass percentage by following material:
Silicon ash 3%
Flyash 15%
Calcium sulfate 2%
Limestone powder 80%;
Wherein, limestone powder median size be 3.6 μ m.
Embodiment 2
A kind of high-strength or super high strength concrete viscosity modifier is mixed by mass percentage by following material:
Silicon ash 10%
Flyash 20%
Calcium oxide 2%
Silica powder 68%;
Wherein, silica powder median size be 2.4 μ m.
Embodiment 3
A kind of high-strength or super high strength concrete viscosity modifier is mixed by mass percentage by following material:
Silicon ash 2%
Flyash 15%
Sodium carbonate 3%
Super finely ground slag 25%
Limestone powder 55%;
Wherein, super finely ground slag median size be 6.9 μ m, limestone powder median size be 5.1 μ m.
Embodiment 4
A kind of high-strength or super high strength concrete viscosity modifier is mixed by mass percentage by following material:
Silicon ash 3%
Flyash 10%
Calcium hydroxide 3%
Super finely ground slag 30%
Silica powder 44%
Limestone powder 10%;
Wherein, super finely ground slag median size be 6.9 μ m, silica powder median size be 3.2 μ m, limestone powder median size be 5.1 μ m.
Related experiment and result
High-strength or super high strength concrete viscosity modifier with embodiment 1-4 obtains carries out concrete viscosity and strength comparison test and low water binder ratio mortar viscosity and strength comparison test.Concrete viscosity can react by the time by the V funnel, and longer by the time, concrete viscosity is larger; The viscosity of mortar obtains by mortar rheometer test result, characterizes with plastic viscosity; Test-results is as follows:
1. adopt the high-strength or super high strength concrete of viscosity modifier of the present invention
Each component of the high-strength or super high strength concrete of table 1
Viscosity and the strength trial result of high-strength or super high strength concrete shown in table 2 table 1
Table 2 data show: adopt viscosity modifier of the present invention can effectively lower concrete viscosity, concrete 7d and 28d ultimate compression strength can not reduce because of adopting this viscosity modifier.
2. adopt the mortar of viscosity modifier of the present invention
Each component that table 3 mortar is joined
The viscosity of mortar shown in table 4 table 3 and strength trial result
This test is 300mm ± 10mm by adjusting water reducer consumption control mortar divergence.In table 4, data show: during identical divergence, adopt viscosity modifier of the present invention can effectively reduce mortar viscosity, reduce the water reducer consumption, and can not reduce mortar strength.
Claims (6)
1. high-strength or super high strength concrete viscosity modifier is characterized in that being comprised of by mass percentage following material:
Silicon ash 2% ~ 10%;
Flyash 10%-20%;
Exciting agent 2% ~ 3%;
Superfine powder 67% ~ 86%.
2. viscosity modifier according to claim 1, the median size that it is characterized in that described silicon ash is 0.1 μ m～0.3 μ m.
3. viscosity modifier according to claim 1, the fineness that it is characterized in that described flyash is 45 μ m square hole sieve screen over-size＜10%.
4. viscosity modifier according to claim 1 is characterized in that described exciting agent is selected from a kind of in calcium hydroxide, sodium carbonate, calcium oxide or calcium sulfate.
5. viscosity modifier according to claim 1, is characterized in that one or more arbitrary proportions that described superfine powder is selected from super finely ground slag, limestone powder, silica powder mix.
6. viscosity modifier according to claim 1 or 5, the median size that it is characterized in that described superfine powder is 2 μ m～10 μ m.
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| CN201310065887.8A CN103145360B (en) | 2013-03-01 | 2013-03-01 | Viscosity modifier for high or ultrahigh-strength concrete |
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| CN201310065887.8A CN103145360B (en) | 2013-03-01 | 2013-03-01 | Viscosity modifier for high or ultrahigh-strength concrete |
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| CN103145360B CN103145360B (en) | 2015-06-24 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529225A (en) * | 2014-12-15 | 2015-04-22 | 江苏苏博特新材料股份有限公司 | High and ultrahigh strength concrete viscosity reducer, preparation method of high and ultrahigh strength concrete viscosity reducer and application of high and ultrahigh strength concrete viscosity reducer |
| CN105271890A (en) * | 2015-10-23 | 2016-01-27 | 武汉比邻科技发展有限公司 | Pre-stressed duct grouting agent, and preparation and application methods thereof |
| CN105272027A (en) * | 2015-09-23 | 2016-01-27 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete with compressive strength of 300MPa or more and preparation method |
| CN105669072A (en) * | 2016-01-17 | 2016-06-15 | 北京清迈华清控股(集团)有限公司 | High performance concrete composite admixture produced by high silicon iron tailings |
| CN105753424A (en) * | 2016-03-01 | 2016-07-13 | 程雷 | High-strength concrete and load-bearing tile produced from solid waste and process of high-strength concrete and load-bearing tile |
| JP2016539022A (en) * | 2013-10-18 | 2016-12-15 | ジーシーピー・アプライド・テクノロジーズ・インコーポレーテッド | Fast response time in slump monitoring systems |
| CN106746842A (en) * | 2015-11-20 | 2017-05-31 | 衡阳市银利实业有限公司 | A kind of concrete viscosity conditioning agent |
| CN106746869A (en) * | 2015-11-20 | 2017-05-31 | 衡阳市银利实业有限公司 | High-strength concrete viscosity modifier |
| CN107021689A (en) * | 2017-05-24 | 2017-08-08 | 石家庄铁道大学 | A kind of Machine-made Sand pump concrete and preparation method thereof |
| CN107555828A (en) * | 2017-09-27 | 2018-01-09 | 中建西部建设新疆有限公司 | A kind of strong concrete thinner |
| CN108059410A (en) * | 2018-01-02 | 2018-05-22 | 南通中厦建筑工程总承包有限公司 | A kind of self-compacting concrete and preparation method thereof |
| CN108484061A (en) * | 2018-03-08 | 2018-09-04 | 同济大学 | A kind of exterior decoration lines and preparation method thereof prepared using ultra-high performance concrete |
| CN108546009A (en) * | 2018-04-27 | 2018-09-18 | 湖北工业大学 | Mix multiple dimensioned grain size CaCO3High performance concrete pulpous state admixture |
| CN108623211A (en) * | 2017-03-22 | 2018-10-09 | 交通运输部公路科学研究所 | A kind of dedicated complex viscosity conditioning agent, conditioning agent preparation method and application method |
| CN109485290A (en) * | 2019-01-03 | 2019-03-19 | 中国路桥工程有限责任公司 | A kind of Machine-made Sand high-strength concrete viscosity modifying material |
| CN109665742A (en) * | 2018-12-10 | 2019-04-23 | 福建科之杰新材料有限公司 | A kind of viscosity reduction type concrete admixture and preparation method thereof based on marble mountain flour |
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| CN1403400A (en) * | 2002-10-14 | 2003-03-19 | 上海市建筑科学研究院 | Admixture specially for high-performance marine concrete |
| CN1784368A (en) * | 2003-05-07 | 2006-06-07 | 株式会社日本触媒 | Cement admixture and cement admixture composite |
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| CN1403400A (en) * | 2002-10-14 | 2003-03-19 | 上海市建筑科学研究院 | Admixture specially for high-performance marine concrete |
| CN1784368A (en) * | 2003-05-07 | 2006-06-07 | 株式会社日本触媒 | Cement admixture and cement admixture composite |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016539022A (en) * | 2013-10-18 | 2016-12-15 | ジーシーピー・アプライド・テクノロジーズ・インコーポレーテッド | Fast response time in slump monitoring systems |
| CN104529225A (en) * | 2014-12-15 | 2015-04-22 | 江苏苏博特新材料股份有限公司 | High and ultrahigh strength concrete viscosity reducer, preparation method of high and ultrahigh strength concrete viscosity reducer and application of high and ultrahigh strength concrete viscosity reducer |
| CN104529225B (en) * | 2014-12-15 | 2016-09-14 | 江苏苏博特新材料股份有限公司 | A kind of height and super high strength concrete thinner, its preparation method and application thereof |
| CN105272027B (en) * | 2015-09-23 | 2017-07-25 | 江苏苏博特新材料股份有限公司 | A kind of compression strength 300MPa above ultra-high performance concretes and preparation method thereof |
| CN105272027A (en) * | 2015-09-23 | 2016-01-27 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete with compressive strength of 300MPa or more and preparation method |
| CN105271890A (en) * | 2015-10-23 | 2016-01-27 | 武汉比邻科技发展有限公司 | Pre-stressed duct grouting agent, and preparation and application methods thereof |
| CN106746842A (en) * | 2015-11-20 | 2017-05-31 | 衡阳市银利实业有限公司 | A kind of concrete viscosity conditioning agent |
| CN106746869A (en) * | 2015-11-20 | 2017-05-31 | 衡阳市银利实业有限公司 | High-strength concrete viscosity modifier |
| CN105669072A (en) * | 2016-01-17 | 2016-06-15 | 北京清迈华清控股(集团)有限公司 | High performance concrete composite admixture produced by high silicon iron tailings |
| CN105753424A (en) * | 2016-03-01 | 2016-07-13 | 程雷 | High-strength concrete and load-bearing tile produced from solid waste and process of high-strength concrete and load-bearing tile |
| CN108623211A (en) * | 2017-03-22 | 2018-10-09 | 交通运输部公路科学研究所 | A kind of dedicated complex viscosity conditioning agent, conditioning agent preparation method and application method |
| CN107021689A (en) * | 2017-05-24 | 2017-08-08 | 石家庄铁道大学 | A kind of Machine-made Sand pump concrete and preparation method thereof |
| CN107555828A (en) * | 2017-09-27 | 2018-01-09 | 中建西部建设新疆有限公司 | A kind of strong concrete thinner |
| CN108059410A (en) * | 2018-01-02 | 2018-05-22 | 南通中厦建筑工程总承包有限公司 | A kind of self-compacting concrete and preparation method thereof |
| CN108484061A (en) * | 2018-03-08 | 2018-09-04 | 同济大学 | A kind of exterior decoration lines and preparation method thereof prepared using ultra-high performance concrete |
| CN108546009A (en) * | 2018-04-27 | 2018-09-18 | 湖北工业大学 | Mix multiple dimensioned grain size CaCO3High performance concrete pulpous state admixture |
| CN108546009B (en) * | 2018-04-27 | 2021-01-08 | 湖北工业大学 | CaCO doped with multi-scale particle size3High performance concrete slurry admixture |
| CN109665742A (en) * | 2018-12-10 | 2019-04-23 | 福建科之杰新材料有限公司 | A kind of viscosity reduction type concrete admixture and preparation method thereof based on marble mountain flour |
| CN109485290A (en) * | 2019-01-03 | 2019-03-19 | 中国路桥工程有限责任公司 | A kind of Machine-made Sand high-strength concrete viscosity modifying material |
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Address after: No.6 shuiyougang, Gulou District, Nanjing City, Jiangsu Province 210013 Patentee after: JIANGSU SUBOTE NEW MATERIALS Co.,Ltd. Patentee after: BOTE BUILDING MATERIALS (TIANJIN) Co.,Ltd. Address before: 211103 No. 69 Liquan Road, Jiangning District, Nanjing City, Jiangsu Province Patentee before: JIANGSU SUBOTE NEW MATERIALS Co.,Ltd. Patentee before: BOTE BUILDING MATERIALS (TIANJIN) Co.,Ltd. |