Steel fiber for ultrahigh-performance concrete

Abstract

The invention discloses a steel fiber for ultrahigh-performance concrete. The steel fiber comprises a steel fiber body with a circular cross section, the steel fiber body is straight or wave-shaped, the surface of the steel fiber body is provided with a plurality of convex structures, the plurality of convex structures are uniformly distributed along the cross section of the steel fiber body, theprojections of the two annular convex structures, which are adjacent to each other longitudinally along the steel fiber body, on the cross section are uniformly staggered, and special-shaped end hooksare arranged at two ends of the steel fiber body. The arrangement of the convex structures and the special-shaped end hooks increases the number of anchoring points and the interfacial bonding area of the steel fiber, and the end hooks increase the anchorage range of the steel fiber and a cement matrix, so the interfacial bond strength and the end anchoring ability of the steel fiber are improved, the tensile strength of the ultrahigh-performance concrete is improved, and the length of the steel fiber is shortened under the premise of meeting the interfacial bonding area of the steel fiber, thereby the cost is maximally saved.

Description

technical field [0001] The invention relates to the technical field of ultra-high performance concrete, in particular to a steel fiber used for ultra-high performance concrete. Background technique [0002] As the most widely used building material in contemporary civil engineering, concrete has the advantages of easy molding, high compressive strength, good durability, and low price. It is widely used in various fields such as tunnels, bridges, roads, buildings, and underground structures. An irreplaceable material for civil engineering construction. However, as a brittle building material, concrete's low tensile strength is still a major problem in its engineering application. [0003] Ordinary high-performance concrete has weaknesses such as high brittleness, low tensile strength, and poor toughness. With the substantial increase in the strength of concrete, the ratio of tensile strength to compressive strength decreases significantly. Generally, the tensile strength of ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to aim at the steel fiber and cement matrix currently used in fiber-reinforced ultra-high performance concrete, which have few anchor points and poor bonding performance, and are easy to pull out during the bearing process of the concrete structure, which affects the safety and security of the concrete structure. To solve the problem that the durability will be adversely affected, a steel fiber for ultra-high performance concrete is provided. The surface of the steel fiber body part is distributed with raised structures, and the two ends are shaped end hooks, which can improve the steel fiber and cement matrix. Bond strength, thereby increasing the tensile strength and toughness of ultra-high performance concrete

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