Novel high-toughness fiber reinforced cement-based composite material and preparation method thereof

Abstract

The invention discloses a novel high-toughness fiber reinforced cement-based composite material and a preparation method thereof. The composite material is prepared from, by weight, 10-20 parts of composite reinforcing fiber, 30-50 parts of portland cement, 15-25 parts of fly ash, 4-10 parts of fine sand, 1-5 parts of dispersing agent, 2-5 parts of water reducing agent, 0.5-3.5 parts of tougheningagent and 12-18 parts of water. According to the composite material, the toughness and crack resistance of the material are improved, the composite reinforcing fiber is uniformly distributed by the dispersing agent, the mechanical properties are changed, the ability of the material to resist deformation is greatly improved, and the probability of occurrence of cracking and fracture of concrete isreduced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a novel high-toughness fiber-reinforced cement-based composite 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 difficulty in controlling the width of cracks after cracking. Therefore, in traditional reinforced concrete structures, engineering accidents often occur due to corrosion of steel bars caused by cracks. Concrete structure cracks directly affect the durability of the structure and the service life of the project, eventually leading to premature deterioration of the conc...

AI Technical Summary

Problems solved by technology

However, concrete has disadvantages such as low tensile strength, poor toughness, and difficulty in controlling the width of cracks after cracking. 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