In-situ reaction type concrete protective agent

Abstract

The invention relates to an in-situ reaction type concrete protective agent, belongs to the technical field of building materials, and specifically relates to a hardened concrete surface protective agent prepared by using a sol-state nano SiO2 or a precursor thereof. Raw materials of the concrete protective agent provided by the invention comprises the sol-state nano SiO2 or the precursor thereof, a calcium ion chelating agent, a concrete curing agent and water. A ratio of the above components is 10-40% : 1-5% : 1-5% : 50-88%. A concrete surface structure is compacted and an object for protecting the concrete can be achieved by utilizing the properties that the sol-state ultrafine particles of protective raw materials and a precursor solution can easily permeate into pores and tiny cracks of the hardened concrete surface and generate an in-situ pozzolanic reaction under an alkali environmental condition of the hardened concrete surface pores. The protective agent provided by the invention has the characteristics of small raw material components, convenient construction and the like, and can be widely applied in protection for the hardened concrete surface in different ages.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to the use of sol-state nano-SiO 2 A method for protecting the surface hardened concrete or its precursors. Background technique [0002] The performance degradation of cement concrete under the action of stress and environmental factors during service is the most important factor that reduces the service life of materials and increases the cost of material use and maintenance. The economic losses caused by the deterioration of concrete performance worldwide are in the trillions every year, and my country is in the period of large-scale economic construction. Improving the impact of concrete against external erosion and giving concrete a longer service life will save material production and use costs. Undoubtedly prominent. The deterioration of concrete caused by the service environment is a process from the surface to the inside. The quality of the surface concrete dire...

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Problems solved by technology

[0010]Using the outstanding volcanic ash reactivity of nano-SiO2, many research results show that it has a significant role in dense cement concrete structure, and has become a cement-based One of the important methods of material modification, but when it is mixed as a raw material component for the production of cement concrete, the increase in material cost and dispersion difficulty brought about by a large amount is not conducive to its large-scale application

[0011] Li Futian and others reported in the "China Building Waterproofing" magazine in September 2012 that nano-silicon is used in waterproofing agents, because nano-silicon is distributed in continuous film-forming organic waterproofing agents Among them, it is difficult for it to penetrate into the concrete matrix effectively and react in situ. Therefore, nano-silicon mainly plays the role of increasing the strength of organic film formation in reform research; Pigino et al. in 2012 in Cement and Concrete Composites , pp. 313-321) discussed the research idea of ​​ethyl silicate modified surface concrete, but it did not involve the implementation of the scheme

The research concept is limited to the use of ethyl silicate, and the operability is narrow if implemented

In addition, pure ethyl silicate has a limited degree of reaction with concrete, and the protection of water in the actual implementation will also have a great impact on its modification effect. However, these issues have not been considered in the relevant literature consulted, and it is difficult to guarantee the actual implementation.

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