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Low-alkaline concrete high-efficiency expanding agent

A high-efficiency expansion agent and concrete technology, which is applied in the chemical industry, can solve the problems of affecting the service life of concrete and the damage of concrete structure, and achieve the effect of good shrinkage compensation function, low cost and high expansion rate

Inactive Publication Date: 2013-02-27
贵州遵辉环保科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

In recent years, with the continuous deepening of the research on the durability of concrete, some people have proposed a new view that "alkali-aggregate reaction" is the main factor affecting the durability of concrete, which puts forward a new topic for the study of expansion agents: The expansion agent contains alkali to varying degrees. As the service life goes by, the alkali in the concrete reacts with the active aggregate, which will damage the concrete structure and affect the service life of the concrete.

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  • Low-alkaline concrete high-efficiency expanding agent

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Embodiment Construction

[0008] The present invention uses kaolinite as a raw material, and generates expansion components under the excitation of alkali medium and sulfate in cement hydration, and is prepared according to a certain proportion of expansion clinker, alunite, and anhydrite, and the components are mutually formed. Restricted and mutually promoted, the strength and expansion of cement are coordinated to achieve the effect of compensating shrinkage.

[0009] A high-efficiency expansion agent for low-alkali concrete, which is made of metakaolinite, alunite and anhydrite formed by calcining kaolinite at a high temperature of 540° to 880° through joint grinding, with a fineness of 2500cm 2 / g; the weight ratio of raw materials is: metakaolin 22-40%, alunite 10-20%, anhydrite 45-60%.

[0010] The main features of this product: ① Low alkali content, the concrete prepared by mixing low alkali UEA-H (the powder made by mixing mineral clinker and admixture) will not cause alkali-aggregate reaction...

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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 [0001] The invention belongs to the field of chemical industry, in particular to a high-efficiency expansion agent for low-alkali concrete. [0002] Background technique [0003] The main feature of expansive concrete is that it can produce moderate volume expansion during the curing period. In the case of steel bars and temporary constraints, it can produce a certain tensile stress on the steel bars, and this stress will compress the concrete. Therefore, in the concrete A certain chemical prestress can be produced. The introduction of this chemical prestress changes the stress state of the concrete, so that it can roughly offset the tensile stress produced by the shrinkage and creep of the concrete, so as to achieve the effects of compensating shrinkage and improving crack resistance and impermeability. The formation of concrete cracks is mostly caused by the influence of external factors. In addition to the load, it is mainly due to the volume change cau...

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Application Information

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IPC IPC(8): C04B22/14
Inventor 文邦祥
Owner 贵州遵辉环保科技有限公司