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High-performance concrete expansion agent and preparation method thereof

A high-performance concrete and expansion agent technology, applied in the field of cement admixture, can solve the problems of large shrinkage, complex production process, small expansion rate, etc., achieve the effect of small shrinkage in the later stage, overcome the problem of structural leakage, and improve durability

Inactive Publication Date: 2012-01-25
SHENZHEN ROCK INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production process of this product is complicated, the liquid shrinkage reducing component and powdery material are not easy to mix, and the expansion rate of this product is relatively small, and it still shrinks greatly in dry air

Method used

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  • High-performance concrete expansion agent and preparation method thereof
  • High-performance concrete expansion agent and preparation method thereof
  • High-performance concrete expansion agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take by weight percentage the expansion clinker 50% of embodiment A, anhydrite 30% (Wuhan Longyuan, sulfur trioxide content is greater than 50%), calcined metakaolin 20% (Guangdong Yunfu, aluminum oxide content is greater than 20%) , calcination temperature 750-850°C), mix the raw materials and grind until the specific surface area is 260m 2 / kg, 0.08mm square hole sieve remaining 12%; obtained product.

Embodiment 2

[0038] Weigh 50% of the expanded clinker of Example B, 40% of anhydrite, and 10% of the high-alumina clinker (Zunyi, Guizhou, with an aluminum oxide content of 50-55%, and a silicon dioxide content of less than 7%) in Example B by weight percentage. Mix and grind until the specific surface area is 250m 2 / kg, 0.08mm square hole sieve remaining 12%; obtained product.

Embodiment 3

[0040] Take by weight percentage the expansion clinker 70%, anhydrite 20%, calcined diatomite (Zhejiang Lin'an, silicon dioxide content 75-95%, aluminum oxide 3-6%, calcining temperature 850- 1000°C) 10%, mix the raw materials and grind until the specific surface area is 280m 2 / kg, 0.08mm square hole sieve remaining 9%; obtained product.

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Abstract

The invention discloses a high-performance concrete expansion agent and a preparation method thereof. The high-performance concrete expansion agent comprises the following components by weight percentage: 30-70 percent of expansion clinker, 20-45 percent of anhydrite and 10-25 percent of other additives. The high-performance concrete expansion agent has functions of cracking prevention, seepage prevention, shrinkage compensation and the like. Compared with the expansion agent in the prior art, the early expansion is large, the later expansion is small, no harmful later expansion can be produced, harmful cracks of concrete structures caused by early shrinkage, dry shrinkage and cold shrinkage can be avoided, the seepage problem of the structures can be solved, and the durability of concrete can be improved greatly.

Description

[technical field] [0001] The invention relates to a cement admixture, in particular to a high-performance concrete expansion agent and a preparation method thereof. [Background technique] [0002] In recent years, with the increase in the size of building structures and the continuous improvement of concrete strength grades, concrete cracking has become more and more serious. Cracks in concrete not only reduce the safety and durability of the structure, but also affect the function of use (cracking is the direct cause of leakage). The use of shrinkage-compensating concrete is the most effective and economical technical way to solve concrete cracking. [0003] The publication date is November 21, 2001, and the Chinese invention patent application whose publication number is CN1322691 introduces a kind of expansion agent for concrete. The expansion agent is made by mixing and pulverizing the following raw materials in weight percentage: 30-70% of anhydrite, 0-17% of alunite, ...

Claims

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Application Information

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IPC IPC(8): C04B22/14
Inventor 黄春江董同刚彭海波何时林黄澄文
Owner SHENZHEN ROCK INVESTMENT
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