CN102942323A - Low-alkaline concrete high-efficiency expanding agent - Google Patents
Low-alkaline concrete high-efficiency expanding agent Download PDFInfo
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- CN102942323A CN102942323A CN 201210426837 CN201210426837A CN102942323A CN 102942323 A CN102942323 A CN 102942323A CN 201210426837 CN201210426837 CN 201210426837 CN 201210426837 A CN201210426837 A CN 201210426837A CN 102942323 A CN102942323 A CN 102942323A
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention relates to a low-alkaline concrete high-efficiency expanding agent, prepared by calcining kaolinite at 540-880 DEG C to form metakaolin, alum stone and anhydrite and conducting mixed grinding. The expanding agent disclosed herein comprises 22-40wt% of metakaolin, 10-20wt% of alum stone and 45-60wt% of anhydrite. The expanding agent disclosed herein has the advantages of high expansion ratio, low alkaline, low mixing amount, simple process, easiness in implementing, and low cost. Concrete produced by using the expanding agent disclosed herein has good compensating shrinkage function and impervious effect and anti-cracking effect.
Description
Technical field
The invention belongs to chemical field, particularly a kind of low alkali concrete high-efficiency expanding agent.
Background technology
The principal feature of expansive concrete is the volumetric expansion that can produce appropriateness between preserving period, reinforcing bar is being arranged and facing in the situation of position constraint, can produce certain tension stress to reinforcing bar, and this stress produces compressive action to concrete, thereby in concrete, can produce certain chemical pre-stressed.This chemical pre-stressed importing has changed concrete stressed condition, makes it can roughly offset concrete tensile stress in contracting and creeping and produce, thereby reaches compensate for shrinkage and the effect that improves cracking resistance, impermeability.The generation of distress in concrete is due to the impact of extraneous factor mostly.Except load, mainly be because the damp and hot variation of the volume change that dehydration and cooling cause and inside concrete (increase and decrease and migration).No matter the volume change which kind of reason causes can both cause the crack, but modal be under restricted condition because of contraction cause dry and cracked.Compensate for shrinkage is exactly to compensate this contraction with the expansion under the restricted condition, thus generation and the development in deduction and exemption crack.In recent years, along with deepening continuously to concrete durability research, someone proposes " alkali one aggregate reaction " is the neodoxy that affects the concrete durability principal element, this just to researching and proposing of swelling agent new problem: contain to some extent alkali in the various swelling agents in the past, passing along with working life, alkali and reactive aggregate in the concrete react, and can produce destruction to concrete structure, and affect concrete work-ing life.Therefore development of new, efficient, low alkali, low-dosage swelling agent are the task of top priority.
Summary of the invention
The purpose of this invention is to provide the more high and low alkali of a kind of rate of expansion, low-dosage and technique swelling agent simple, easy to implement, with low cost.
A kind of low alkali concrete high-efficiency expanding agent, this swelling agent are to calcine the metakaolinite, alunite, the anhydrite that form by kaolinite under 540 °～880 ° high temperature to form through intergrinding; Its raw material weight proportioning is: metakaolinite 22～40%, alunite 10～20%, anhydrite 45～60%.
The more high and low alkali of high-efficiency expanding agent rate of expansion of the present invention, low-dosage and technique are simple, easy to implement, with low cost.The concrete that adopts high-efficiency expanding agent of the present invention to produce has good compensate for shrinkage function and effect impervious, anticracking.
Embodiment
The present invention adopts kaolinite as raw material, under the alkaline media of hydrated cementitious and sulphate activation, generate expansion component, expansive clinker according to a certain percentage, alunite, anhydrite are prepared from, form between its composition be mutually keep within bounds, synergistic, so that the intensity of cement and expansion Development and Harmony, reach the effect of compensate for shrinkage.
A kind of low alkali concrete high-efficiency expanding agent is to calcine the metakaolinite, alunite, the anhydrite that form by kaolinite under 540 °～880 ° high temperature to form through intergrinding, and fineness is 2500 ㎝
2/ g; Its raw material weight proportioning is: metakaolinite 22～40%, alunite 10～20%, anhydrite 45～60%.
The principal feature of this product: 1. alkalinity is low, mixes the pulvis that low alkali UEA-H(mineral clinker and adulterant mix grinding form) concrete prepared can not cause alkali-aggregate reaction and the destruction that causes concrete structure; 2. the slump-loss that is mixed with the concrete mix of low alkali UEA-H is significantly smaller than the slump-loss of the concrete mix of mixing alumite plumping agent, makes in the past the manufacturer of ready mixed concrete feel that the problem of having a headache is resolved; 3. higher expansion performance and stable is arranged; 4. hydration heat is low, can postpone the time that the aquation peak occurs, and this is favourable to mass concrete construction.In the production process, by reducing the calcining temperature in producing, effectively prolong the raw coal combustion time, thereby reach the purpose of save energy, improved resource utilization, reduced product cost, be conducive to development and realize low-carbon economy, have good economic benefit, ecological benefits and social benefit.
The present invention is by changing its composition of raw materials ratio, and calcining forms metakaolinite under 540 °～880 ° high temperature, and the A1-O system of metakaolinite is in state of disarray, and activity is higher, easily aquation; Finally make the present invention reach good compensate for shrinkage function, reach the effect of anti-permeation cracking-resistant, thereby improve the quality of products, expand the Application Areas of Project Product.
The key technical indexes of the present invention and national standard synopsis:
The present invention in process of production; by reducing the calcining temperature in producing; effectively prolong the raw coal combustion time; thereby reach the purpose of save energy, improved resource utilization, reduced product cost; be conducive to development and realize low-carbon economy; thereby safeguarded ecological balance, immeasurable effect has been played in environment protection, promoted regional sustainable development.
Claims (1)
1. one kind low alkali concrete high-efficiency expanding agent is characterized in that: described swelling agent is to calcine the metakaolinite, alunite, the anhydrite that form by kaolinite under 540 °～880 ° high temperature to form through intergrinding; Its raw material weight proportioning is: metakaolinite 22～40%, alunite 10～20%, anhydrite 45～60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210426837 CN102942323A (en) | 2012-10-31 | 2012-10-31 | Low-alkaline concrete high-efficiency expanding agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210426837 CN102942323A (en) | 2012-10-31 | 2012-10-31 | Low-alkaline concrete high-efficiency expanding agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102942323A true CN102942323A (en) | 2013-02-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210426837 Pending CN102942323A (en) | 2012-10-31 | 2012-10-31 | Low-alkaline concrete high-efficiency expanding agent |
Country Status (1)
| Country | Link |
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| CN (1) | CN102942323A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755215A (en) * | 2014-02-17 | 2014-04-30 | 陈宝 | Preparation method of tubular pile concrete auxiliary material |
| CN105254203A (en) * | 2015-09-24 | 2016-01-20 | 滁州京安工贸有限责任公司 | Concrete and mortar expanding agent |
-
2012
- 2012-10-31 CN CN 201210426837 patent/CN102942323A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755215A (en) * | 2014-02-17 | 2014-04-30 | 陈宝 | Preparation method of tubular pile concrete auxiliary material |
| CN103755215B (en) * | 2014-02-17 | 2015-07-01 | 广西华南建设集团有限公司 | Preparation method of tubular pile concrete auxiliary material |
| CN105254203A (en) * | 2015-09-24 | 2016-01-20 | 滁州京安工贸有限责任公司 | Concrete and mortar expanding agent |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130227 |