Reaction in-situ type concrete protective agent with self-cleaning function

Abstract

The invention relates to a reaction in-situ type concrete protective agent with a self-cleaning function, belonging to the field of building materials, and particularly relates to a method for protecting surface hardened concrete by ethyl orthosilicate modified nano TiO2. The concrete protective agent provided by the invention comprises the following raw materials in percentage by weight: 10-50% of ethyl orthosilicate, 0-10% of a silane coupling agent, 3-15% of nano TiO2 and 25-87% of water. By means of the character that ethyl orthosilicate in the raw material of the protective agent permeates into surface holes of the hardened concrete and is hydrolyzed in situ to generate nano SiO2, the nano SiO2 has the pozzolanic reaction under an alkaline environment of the surface holes of the hardened concrete, so as to compactly protect the surface of the concrete. The nano TiO2 compounded with ethyl orthosilicate through the coupling agent can be effectively attached to the surface hardened concrete so as to endow the concrete surface with the self-cleaning function. Meanwhile, the physical hole blocking effect of the nano TiO2 particles can further improve the compactness of the surface concrete. The protective agent provided by the invention has the characteristics of less raw material components, convenience in construction and the like, and can be widely applied to protecting and beautifying the hardened concrete surface.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to nano-TiO modified by tetraethyl orthosilicate 2 A method of protecting surface-hardened concrete. Background technique [0002] The concrete structure is affected by factors such as water, air, temperature difference, and stress in the environment. The deterioration of the surface material performance is the reason for the reduction of the service life of the structure, and the reduction of the appearance quality of the structure due to the adsorption of environmental pollutants also affects its structural beauty. reason. The quality of the surface concrete directly affects the anti-deterioration ability of the overall structure. Improving the performance of the overall structure by improving the quality of the surface concrete is a long-term research direction that people have paid attention to. In addition, the cleanliness of the surface concrete is also a major f...

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Problems solved by technology

[0006] Nano-SiO 2 Outstanding volcanic ash reactivity, many research results show that it has the effect of significantly compacting the structure of cement concrete, and has become one of the important methods for modifying cement-based materials, but when it is mixed as a raw material component for the production of cement concrete, it is relatively large. The increase in material cost and dispersion difficulty brought about by the dosage is also not conducive to its large-scale application

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