Concrete medium erosion resistant additive based on in-situ reaction encapsulation technology and preparation method

Abstract

The invention discloses a concrete medium erosion resistant additive based on an in-situ reaction encapsulation technology and a preparation method. Core components of the concrete medium erosion resistant additive based on the in-situ reaction encapsulation technology are encapsulated active components, the encapsulation is to absorb and encapsulate active components in an interlayer structure byvirtue of an encapsulation component, and the ratio of the encapsulation component to the active component is 0.5 to 8. According to the invention, inorganic nano-silica particles with high hydrationreaction activity are encapsulated on the basis of a coating technology, and then the ionization, release and reaction of the inorganic nano-silica particles in a concrete hydration microenvironmentare packaged at a later stage, so that the long-term chloride ion diffusion coefficient of the concrete is obviously reduced by virtue of optimization of the concrete microstructure in the service process, and the concrete medium erosion resistant additive based on the in-situ reaction encapsulation technology and the preparation method are provided for a concrete durability improvement technology.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete anti-medium erosion admixture based on in-situ reaction encapsulation technology and a preparation method thereof. Background technique [0002] Concrete is an important building material for infrastructure construction and is widely used in the main structural parts of construction projects. In recent years, with the promotion and implementation of major national strategies, the service environment, construction conditions and design life of my country's infrastructure have shown new characteristics. Traditional concrete has been difficult to adapt to the new changes in the design, construction and service performance of building structures. It is imperative to research new technologies to ensure and improve the durability of concrete in harsh environments. [0003] The main factors affecting the durability of concrete can be attributed to the ...

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Problems solved by technology

[0010] Nevertheless, the substantive content of the above-mentioned patent application has the following problems: (1) The purpose of using encapsulated highly reactive substances is to realize the self-healing effect on concrete cracks in the later stage, and the goal is not to significantly reduce the long-term chloride ion diffusion coefficient of concrete ; (2) Organic materials are mainly used as packaging materials, and the high-active substances are physically coated, which is not conducive to the automatic release of high-active substances, and it is necessary to use external force to destroy the packaging materials to produce effects

To sum up, the above-mentioned documents all report the encapsulation materials, preparation methods and application technologies for highly reactive substances in concrete, but the above-mentioned patent applications focus on the self-healing function of concrete, and do not include the long-term chloride ion diffusion coefficient of concrete Therefore, the effect of the above-mentioned technology on inhibiting the chloride ion diffusion coefficient of concrete under long-term service conditions remains to be discussed.

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