Concrete protection sol

Abstract

The invention relates to a concrete shield sol which mainly consists of sodium silicate, potassium metasilicate and water. The sodium silicate and the potassium metasilicate are ultrafine solid particles with a diameter of one to one hundred nanometer. Proportion between the sodium silicate and the potassium metasilicate is between three point two to one and four point two to one, weight proportion between the gross weight of ultrafine solid particles in the sol and the gross weight of water twenty-six to thirty percent to seventy-four to seventy percent. The invention has the advantages that: the sol made of highly distributed ultrafine solid particles change ions, the main reaction body of in chemical reaction with a hydration product in a concrete pore, into ultrafine solid particles; based on a double insulation protection of a whole isolated layer and a local isolated layer for the structure of the concrete, with an organically combined properties and combined action of a sol anda gelatin, the enterer and corrosion of a corrosion medium can be restrained, an long-term stable effective protection for the concrete structure can be realized, the durability of the concrete structure can be increased, actual service life can be prolonged and the later repair and maintenance can be reduced.

Description

technical field [0001] The invention relates to a concrete protective material, which belongs to the external coating penetration type product, in particular to a sol-type concrete protective material. Background technique [0002] At present, there are many methods of coating materials on the outer surface of concrete for the protection of concrete structures. In permeable materials, such as: materials with sodium silicate as the main component, it achieves the purpose of protecting the concrete structure by coating or injecting materials with sodium silicate as the main component at waterproofing and maintenance. However, the material has problems such as fast reaction speed in concrete, poor permeability, and formation of surface membranes that are easy to wear and tear because the main body is sodium monosilicate. [0003] The improved alkali metal silicate aqueous solution aimed at the above problems, such as: Chinese Invention Patent Disclosure: adopts any two combina...

AI Technical Summary

Problems solved by technology

Therefore, the gel formed by the reaction of the mixed aqueous solution in concrete is unstable, that is, the protective effect is unreliable, which is extremely detrimental to the protection of concrete structures used in natural environments

[0007] 2. The gel produced by the reaction of the mixed aqueous solution in the concrete pores has poor mechanical properties

[0008] The gel formed by the reaction of the mixed aqueous solution in the concrete pores is directly formed from the solution state without solid tissue, and the gel lacks the support of the solid skeleton tissue, resulting in poor mechanical properties of the gel itself, resulting in a gel layer The anti-seepage pressure ratio is low, and the ability to resist concrete deformation is small, which is not conducive to the protection of concrete structures

[0009] 3. The pore structure of the gel layer is poor

[0010] Due to the lack of solid skeleton tissue in the gel, the pore structure of the gel layer is poor, the pore size is large, and the dispersion of the pores is small, resulting in a small specific surface area of ​​the gel layer and a small surface adsorption energy. The adsorption capacity of water and corrosive media becomes poor, and the gel layer has low protection ability for concrete

[0011] 4. The mixed aqueous solution does not fully protect the concrete

Therefore, the protection of mixed aqueous solution is not comprehensive in terms of comprehensively improving the corrosion resistance of concrete structures against corrosive media.

[0013] 5. The gel layer itself has no freeze-thaw resistance

However, because the porosity of the gel layer itself has capillary water absorption, at the freezing point, the gel after water absorption will also freeze, causing the gel layer of the concrete to freeze-thaw and lose its protective effect on the concrete.

Therefore, the mixed aqueous solution can only prevent the freeze-thaw damage generated inside the concrete, but cannot prevent the freeze-thaw damage generated by the concrete gel layer itself.

However, the freeze-thaw damage of concrete generally occurs from the surface to the inside, so the freeze-thaw resistance of the mixed aqueous solution is poor.