Steel fiber cement-based composite material based on nanoscale reinforcement and preparation method thereof

Abstract

The invention provides a steel fiber cement-based composite material based on nanoscale reinforcement and a preparation method thereof, and relates to the technical field of cement-based composite materials. The composite material provided by the invention is prepared from the following components in percentage by mass: 25 to 40 percent of cement, 7.5 to 10.5 percent of silica fume, 35 to 50 percent of river sand, 5 to 7.5 percent of water, 1 to 1.5 percent of water reducing agent, 5 to 9 percent of steel fiber and 0.01 to 0.15 percent of nano cellulose fiber. A small amount of nano cellulose fibers are added into the steel fiber cement-based composite material, a steel fiber-cement matrix interface transition area is subjected to nano-scale improvement in a mode of reinforcing a matrix through the nano-crystalline cellulose fibers, and the mechanical property can be remarkably improved under the condition of low steel fiber mixing amount; the nano-crystalline cellulose fiber has hydrophilicity and can be tightly combined with the cement matrix, so that the mechanical property of the composite material can be improved; and the nano cellulose fiber also has the characteristics of wide material sources and environmental protection.

Description

technical field [0001] The invention relates to the technical field of cement-based composite materials, in particular to a nano-scale reinforced steel fiber cement-based composite material and a preparation method thereof. Background technique [0002] Steel fiber cement-based composite material is a new type of cement-based composite material known for its low porosity and high durability on the premise of ultra-high strength. It has broad applications in bridge engineering, water conservancy engineering, national defense engineering, municipal engineering, etc. Prospects, especially in bridge engineering, steel fiber cement-based composite materials are widely used in main girder structures, arch bridge main arches, bridge deck structures, etc. as stressed components. Steel fiber cement-based composite materials are mainly composed of steel fibers and cement matrix. The incorporation of steel fibers changes the failure mode of cement-based materials from brittle failure t...

AI Technical Summary

Problems solved by technology

However, increasing the amount of steel fiber will easily aggravate the fiber agglomeration, resulting in a significant decrease in the fluidity of the steel fiber cement-based composite material mixture, which is not conducive to its construction application in cast-in-place projects; in addition, it is easy to make the material and the external environment A closed loop is formed to increase the risk of electrochemical corrosion; at the same time, most of the steel fibers used are copper-plated steel fibers, and copper plating on the surface of steel fibers consumes a lot of resources, making the cost of steel fibers account for more than half of the total cost, resulting in Dramatic increase in production costs and huge energy consumption

Images