Basalt fiber reinforced cement based material and preparation method therefor

Abstract

The invention relates to cement-based materials and particularly discloses a basalt fiber reinforced cement based material and a preparation method therefor. The basalt fiber reinforced cement based material contains the following ingredients: 400-800kg / m<3> of cement, 150-330kg / m<3> of active mineral admixture, 800-1,500kg / m<3> of fine aggregate, 10-40kg / m<3> of water reducing agent, 0.01-0.05kg / m<3> of setting retarder, 0.5-3.0% (volume percent) of basalt fibers and 0.2-1.0% (mass percent) of fiber surface modifier. According to the basalt fiber reinforced cement based material and the preparation method therefor, through optimizing a formula, the compactness of the material is improved, meanwhile, the property of an interface layer between the basalt fibers and a cement bonding material is improved, and the interfacial bonding strength is improved. The structure and mechanical properties of the basalt fiber reinforced cement based material disclosed by the invention are improved relatively greatly, and the compression strength, folding strength and toughness are improved greatly.

Description

technical field [0001] The invention relates to cement-based materials, in particular to a basalt fiber reinforced cement-based material and a preparation method thereof. Background technique [0002] Cement-based materials have a series of advantages such as high strength, good durability, and low cost. However, cement-based materials have their own disadvantages such as large shrinkage deformation, high brittleness and easy cracking, etc., especially those developed by adding chemical admixtures. Although the strength of the new high-performance cement-based material has been improved, problems such as poor toughness, cracks, dry shrinkage and brittleness have also appeared. At present, there are many studies on improving the performance of cement-based materials by adding fibers, and adding basalt fibers is one of the common methods. Basalt fiber is a pure natural inorganic non-metallic material made of natural basalt ore through high-temperature melting and drawing. It ...

AI Technical Summary

Problems solved by technology

However, with the addition of basalt fibers or other fibers, the accumulation structure principle of cement-based materials is seriously changed, and the porosity of cement-based materials is increased to a certain extent. At the same time, there will be an interface layer between fibers and cement cement substances. The interfacial opening strength of the two in the interface layer is usually low, so the addition of basalt fiber does not significantly enhance the basic mechanical properties, and even leads to a decrease in strength. The concentrated expression is that the cement-based material added with basalt fiber is brittle. , lower flexural strength