Silica-based cement-based porous material and preparation method thereof

Abstract

The invention relates to the technical field of building materials, and discloses a silica-based cement-based porous material and a preparation method thereof. The cement-based porous material is mainly composed of cement, admixtures, water, admixtures, and a silica dispersion, and then hardened by coagulation Obtain; wherein the silica dispersion is a dispersion system formed by dispersing silica particles in water. In the present invention, because the cement hydration reaction fails to completely consume the introduced water, a large amount of capillary space is formed, and the cement hydration product reacts with spherical silica on the surface of the silica, and the cement hydration product grows on the silica, The overlapping of each other can refine and divide the capillary space, and build a large number of nanopore spaces in the capillary space, increasing the proportion of nanopores in the cement composite porous material; at the same time, through the construction of the capillary space by the nanopore structure, the strength of the material is strengthened. The microstructure is conducive to the development of material strength and improves the mechanical properties of cement-based porous materials.

Description

Silica-based cement-based porous material and preparation method thereof technical field The present invention relates to the technical field of building materials, be specifically related to the cement-based porous material based on silica and its preparation. preparation method. Background technique Cement-based porous materials are used as building thermal insulation materials due to the advantages of simple process, low cost, safety and fire prevention. There is a huge potential in the field of cement-based porous materials. It is prepared by entraining air inside the material to form pores or carrying the cellular structure into the cement-based material through prefabricated foam, lightweight aggregate, etc. Cement-based materials with rich pore structure. Introducing more pore structures into cement-based materials can achieve ultra-lightweight materials and further improve its retention. Thermal insulation performance, but at the same time the introductio...

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Problems solved by technology

[0003] Introducing more pore structures into cement-based materials can achieve ultra-lightweight materials and further improve their thermal insulation performance, but at the same time, the introduction of pores will also lead to a significant weakening of the mechanical properties of cement-based porous materials, especially when the pore size is 0.1 μm The higher the pore content above, the mechanical properties of the porous material will decrease significantly

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