Low-shrinkage and high-toughness building material and preparation method thereof

Abstract

The invention discloses a low-shrinkage and high-toughness building material and a preparation method thereof. The building material comprises, by weight, 10-20 parts of polyacrylonitrile fibers, 30-50 parts of Portland cement, 15-25 parts of diatomaceous earth, 6-12 parts of silicon powder, 4-8 parts of light calcium carbonate, 2-6 parts of plant composite fibers, 1-4 parts of calcium lignosulfonate, 1.6-3.8 parts of nitrile butadiene rubber, 4-10 parts of composite reinforced fibers, 0.5-1.5 parts of a dispersant, 0.3-0.7 part of a water reducer, 0.2-0.6 part of a polymer binder and 12-18 parts of deionized water. The building material has the advantages of low shrinkage, high toughness, and reduction of cracking and fracture, the preparation method is simple and can be easily realized,and the building material can be widely used for reinforcing walls, roofs and floors of industrial and civil buildings, roads, bridges, tunnels and slopes.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a low-shrinkage and high-toughness building material and a preparation method thereof. Background technique [0002] Building materials are the basis of construction engineering, and concrete is the most widely used building material. Its main components include cement, admixtures and aggregates. It is hardened after adding water and mixing. It has the advantages of simple process and fire resistance. However, concrete has disadvantages such as low tensile strength, poor toughness, and large shrinkage rate. Therefore, in traditional reinforced concrete structures, engineering accidents due to corrosion of steel bars caused by cracks often occur. Concrete structure cracks directly affect the durability of the structure and the service life of the project, eventually leading to premature deterioration of the concrete structure or even complete loss of function. In order...

AI Technical Summary

Problems solved by technology

However, concrete has disadvantages such as low tensile strength, poor toughness, and large shrinkage rate. Therefore, in traditional reinforced concrete structures, engineering accidents often occur due to corrosion of steel bars caused by cracks.

Cracks in concrete structures directly affect the durability of the structure and the service life of the project, eventually leading to premature deterioration of the concrete structure or even complete loss of function

In order to overcome these shortcomings of concrete, carbon fiber concrete and steel fiber concrete have emerged as the times require. The fiber content of this type of concrete is usually less than 2%. Although this can reduce the early cracking of concrete to a certain extent and improve the flexural toughness of the material, etc. , but strain softening damage still occurs under direct tensile load, and the crack immediately enters the stage of localized expansion after cracking