CN102584085A - Special additive for inhibiting concrete alkali-aggregate reaction - Google Patents

Special additive for inhibiting concrete alkali-aggregate reaction Download PDF

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Publication number
CN102584085A
CN102584085A CN2012100547476A CN201210054747A CN102584085A CN 102584085 A CN102584085 A CN 102584085A CN 2012100547476 A CN2012100547476 A CN 2012100547476A CN 201210054747 A CN201210054747 A CN 201210054747A CN 102584085 A CN102584085 A CN 102584085A
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China
Prior art keywords
concrete
alkali
aggregate
additive
aggregate reaction
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Pending
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CN2012100547476A
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Chinese (zh)
Inventor
刘福战
蒋宝祥
李志峰
孙洪全
查广利
于国松
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刘福战
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Priority to CN2012100547476A priority Critical patent/CN102584085A/en
Publication of CN102584085A publication Critical patent/CN102584085A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a concrete additive, particularly to a special additive for inhibiting a concrete alkali-aggregate reaction. Active fine powder is used as a carrier, and the multiple compounding technologies such as air entraining (lignosulfonate), water resistance (stearate), water reduction (lignin), early strengthening (nitrate) and the like are adopted. The cost of the additive is greatly lower than that of the foreign lithium salt additive. The doping amount of the inhibitor is 2-4% of cement aiming at high, medium and low activities of aggregate under different alkali content conditions, and the inhibitor has good inhibitory effect. The higher the activity of the aggregate alkali is, the more obvious the inhibitory effect is. The higher the content of concrete alkali is, the more obvious the inhibitory effect is. After the inhibitor is added into concrete, the overall performance is increased, the workability is improved, the slump loss is reduced, 28d strength is increased, the durability such as freezing resistance, seepage resistance and the like is increased, the harms of steel bar corrosion and the like do not occur, the service life of concrete is prolonged, the use safety of concrete is ensured, and the social benefit is great.

Description

A kind of special additive that suppresses the concrete alkali aggregate reaction
 
Technical field
The present invention relates to a kind of concrete admixture, particularly, relate to a kind of special additive that suppresses the concrete alkali aggregate reaction.
Background technology
Weather resistance is concrete important performance indexes, is related to work-ing life of concrete works and safe in utilization.Destructive expansion reaction takes place in the alkali that alkali-aggregate reaction results from sand, stone aggregate and the system in the concrete, causes the Cracking Failure of concrete structure.And because this reaction destroys longer duration, having can not reparation property, thereby many in the world scientists are referred to as concrete " cancer ".Since coming to light this destructive factor the forties in last century, caused a large amount of engineerings to destroy, lose huge.A series of engineerings at China eighties to beginning of the nineties; Because the destruction of alkali-aggregate reaction; Heavy losses have also been caused; Like the concrete works on ground such as Beijing, Tianjin, Lintong, Xi'an, Tacheng, Jinxi, Liaoning, Taiyuan, Shanxi, tafelberg, Henan, Weifang, Shandong, the engineering that harm relates to comprises bridge, sleeper, airfield runway, electric pole and some industry and covil construction.
This shows that alkali-aggregate reaction has become a major cause of harm China concrete works weather resistance, must attract great attention.We should fully realize understanding alkali-aggregate reaction, the measure of research prevention or inhibition alkali-aggregate reaction, and formulate corresponding techniques rules, the destruction that prevents newly-built concrete works generation alkali-aggregate reaction.
The measure of prevention alkali-aggregate reaction at present mainly contains: 1. use inert aggregate, 2. control cement or higher alkali content and 3. use chemical admixture or mineral additive.Do brief analysis now: China's area complicated condition, reactive aggregate distributes extensively; China is the area much; Particularly northern area cement alkali content is very high always; Do not accomplish in the engineering according to situation of raw materials such as engineering importance, the aggregate use cement of classifying; Before two kinds of measures because of the influence of factors such as price, resource reserve, environment for use, the high reinforcement of concrete, have certain limitation in practice.Can alleviate, suppress alkali-aggregate reaction though use mineral additives such as active admixture such as silicon ash, ground blast furnace slag, flyash; But, can cause that early age strength of concrete descends, and influences construction speed because its volume is big; Also can cause the concrete shrinkage cracking, also be a difficult problem technically.Therefore adopt chemical admixture to suppress concrete alkali-aggregate reaction and just become inevitable choice.
Though abroad having succeeded in developing chemical admixture suppresses alkali-aggregate reaction, only develops lithium salts, this material costs an arm and a leg, and is difficult to promote.Therefore develop a kind of new, that chemical admixture non-lithium salts, cheap suppresses concrete alkali-aggregate reaction is significant.
Summary of the invention
The purpose of this invention is to provide a kind of new, chemical admixture non-lithium salts, cheap and suppress concrete alkali-aggregate reaction.
Suppressing the special additive of concrete alkali aggregate reaction, is carrier with active fine powder material, has adopted bleed (sulfonated lignin), anti-water (stearate), diminishing (xylogen), early strong polynary compounding technologys such as (nitrate salt).The cost of admixture is significantly less than external lithium salts admixture.
Under Different Alkali content condition, its volume is 2%~4% of a cement quality to suppressor factor, all has the good restraining effect to high, medium and low different activities aggregate.The aggregate basic active is high more, and it is remarkable more to suppress effect; Higher alkali content is high more, and it is remarkable more to suppress effect.
After concrete mixed suppressor factor, its over-all properties improves, and workability improves, and slump-loss reduces, and 28d intensity improves, and is freeze proof, impervious etc., and weather resistance improved the harm of no-reinforcing-bar corrosion etc.
Weather resistance such as inhibition concrete alkali-aggregate reaction has improved concrete over-all properties with admixture, improves like workability, and slump-loss reduces, and 28d intensity improves, and is freeze proof, impervious improve the harm of no-reinforcing-bar corrosion etc.
Suppress concrete alkali-aggregate reaction and improved concrete weather resistance, prolonged concrete work-ing life, guaranteed concrete safe in utilizationly, have bigger social benefit with admixture.
Embodiment
Suppressing the special additive of concrete alkali aggregate reaction, is carrier with active fine powder material, has adopted bleed (sulfonated lignin), anti-water (stearate), diminishing (xylogen), early strong polynary compounding technologys such as (nitrate salt).The cost of admixture is significantly less than external lithium salts admixture.
The admixture Economic and Efficiency Analysis
1, admixture material cost
The material cost that suppresses concrete alkali-aggregate reaction use admixture is 1 ton 1219.60 yuan; Build an admixture factory that produces 5000 tons in suppressor factor per year; Price per ton by 3000 yuan, profit per ton by 1000 yuan, then admixture factory only kind of suppressor factor 1 year with regard to profitable 5,000,000 yuan.
2, if large-scale priority project concrete amount 2 ten thousand steres, is then used 300~400 tons of concrete alkalis-aggregate reaction suppressor factor, and then an engineering is with regard to profitable 30~400,000 yuan.
3, concrete increases cost
Suppose the gel material content 500kg/m3 meter in the concrete; The volume of alkali-aggregate reaction suppressor factor is as by 3%~4%; Then the consumption of 1m3 concrete suppressor factor is 15kg~20kg, and price per ton is by 3000 yuan, and the cost that then the 1m3 concrete need increase behind the admixture suppressor factor is 45~60 yuan.It is thus clear that the cost that the cost that alkali-aggregate reaction suppressor factor increases the folk prescription concrete increases well below the lithium salts admixture.

Claims (2)

1. a special additive that suppresses the concrete alkali aggregate reaction is a carrier with active fine powder material, it is characterized in that: adopted bleed, anti-water, diminishing, strong polynary compounding technology early.
2. a kind of special additive that suppresses the concrete alkali aggregate reaction according to claim 1 is characterized in that: air entrapment agent adopts sulfonated lignin, water repellent agent to adopt stearate, water reducer to adopt xylogen, hardening accelerator to adopt nitrate salt.
CN2012100547476A 2012-03-05 2012-03-05 Special additive for inhibiting concrete alkali-aggregate reaction Pending CN102584085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012100547476A CN102584085A (en) 2012-03-05 2012-03-05 Special additive for inhibiting concrete alkali-aggregate reaction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012100547476A CN102584085A (en) 2012-03-05 2012-03-05 Special additive for inhibiting concrete alkali-aggregate reaction

Publications (1)

Publication Number Publication Date
CN102584085A true CN102584085A (en) 2012-07-18

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103073223A (en) * 2013-02-01 2013-05-01 同济大学 Concrete admixture for inhibiting alkali reactivity of metamorphic rock aggregate and preparation method and application of concrete admixture
CN103113062A (en) * 2013-02-01 2013-05-22 同济大学 Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof
CN103819112A (en) * 2014-03-11 2014-05-28 山东省建筑科学研究院 Calculation method for mixing amount of clay inhibitor in concrete
CN109608085A (en) * 2018-12-28 2019-04-12 内蒙古自治区水利水电勘测设计院 A kind of alkali-aggregate reaction inhibitor
CN110015856A (en) * 2019-04-23 2019-07-16 吉林省送变电工程有限公司 A kind of method that aggregate inhibits basic active

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103073223A (en) * 2013-02-01 2013-05-01 同济大学 Concrete admixture for inhibiting alkali reactivity of metamorphic rock aggregate and preparation method and application of concrete admixture
CN103113062A (en) * 2013-02-01 2013-05-22 同济大学 Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof
CN103113062B (en) * 2013-02-01 2014-08-13 同济大学 Metamorphite machine-made sand concrete capable of inhibiting alkali activity of metamorphite aggregate and preparation method thereof
CN103819112A (en) * 2014-03-11 2014-05-28 山东省建筑科学研究院 Calculation method for mixing amount of clay inhibitor in concrete
CN109608085A (en) * 2018-12-28 2019-04-12 内蒙古自治区水利水电勘测设计院 A kind of alkali-aggregate reaction inhibitor
CN109608085B (en) * 2018-12-28 2020-03-06 内蒙古自治区水利水电勘测设计院 Alkali aggregate reaction inhibitor
CN110015856A (en) * 2019-04-23 2019-07-16 吉林省送变电工程有限公司 A kind of method that aggregate inhibits basic active

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COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: LIU FUZHAN JIANG BAOXIANG LI ZHIFENG SUN HONGQUAN CHA GUANGLI YU GUOSONG TO: LIU FUZHAN JIANG BAOXIANG LI ZHIFENG SUN HONGQUAN CHA GUANGLI YAO BINGWEN YU GUOSONG

CB03 Change of inventor or designer information

Inventor after: Liu Fuzhan

Inventor after: Jiang Baoxiang

Inventor after: Li Zhifeng

Inventor after: Sun Hongquan

Inventor after: Cha Guangli

Inventor after: Yao Bingwen

Inventor after: Yu Guosong

Inventor before: Liu Fuzhan

Inventor before: Jiang Baoxiang

Inventor before: Li Zhifeng

Inventor before: Sun Hongquan

Inventor before: Cha Guangli

Inventor before: Yu Guosong

WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120718

C02 Deemed withdrawal of patent application after publication (patent law 2001)