A kind of recycled fiberglass-polyvinyl alcohol hybrid fiber high-toughness concrete

Abstract

The invention provides a recycled fiberglass-polyvinyl alcohol hybrid fiber high-toughness concrete. The weight fractions of raw materials are: cement 800-1000 parts, silica fume 30-50 parts, fine aggregate 1200-1350 parts, coarse aggregate 1600-2000 parts, recycled fiberglass large size 10-20 parts, medium size 20-30 parts parts, small size 5-10 parts, polyvinyl alcohol fiber 6.3-7.5 parts, water reducing agent 6.5-8.5 parts, defoamer 5.6-7.1 parts, oxidant solution 300-400 parts, dispersant 0.2-0.5 parts, water 400 parts ‑450 copies. The toughness is improved by improving the adhesion of recycled fiberglass in concrete and improving the dispersibility of PVA fiber. The surface of recycled fiberglass is oxidized by oxidizing agent, and the fiber surface is etched, forming mechanical meshing with the concrete contact surface, dispersing There are hydrophilic groups in the molecular chain of the agent. When the fiber is soaked in the aqueous solution of the dispersant, it will help the water to wet the fiber and improve the dispersion. The hybrid fiber concrete prepared by the invention has a simple preparation process, is convenient for construction, and can be widely used in the fields of civil engineering, transportation and the like.

Description

technical field [0001] The invention relates to a recycled glass fiber reinforced plastic-polyvinyl alcohol hybrid fiber high-toughness concrete, which belongs to the technical field of building materials. Background technique [0002] Fiber reinforced concrete is a cement-based composite material made of concrete as the matrix material and mixed with other fibers. Since the addition of a single fiber cannot meet the various indicators of concrete materials, most of them are mixed with two or more fibers, mainly high-modulus fibers and low-modulus fibers. High-modulus fibers can improve the compressive strength of concrete materials. , Low-modulus fibers inhibit concrete cracking. Because steel fibers have good tensile strength and shear resistance, they can significantly improve the mechanical properties of concrete, and are widely used in fiber-reinforced concrete. For example, Chinese Patent Application No. 201811207141.5 discloses a hybrid fiber reinforced concrete and ...

AI Technical Summary

Problems solved by technology

However, the cost of steel fiber itself is 10,000 yuan per ton, which increases the cost of fiber concrete. At the same time, steel fibers are easily corroded, and durability risks need to be considered

In addition, the polyvinyl alcohol fiber introduced in this patent is directly added before adding the mixed solution. Since the fiber is bundled, it is not easy to disperse evenly in the concrete, which will affect the strength of the concrete.

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