High performance concrete containing composite fiber

Abstract

The invention discloses high performance concrete containing composite fiber. The problems in the existing high performance concrete of being large in fiber adding amount and poor in mechanical performance, stretching toughness and bend ductility are solved. The technical scheme is that the high performance concrete comprises the concrete and the composite fiber. Based on 100% of volume of the concrete, mixing rate of the composite fiber is 0.8-1% of the concrete volume, and the composite fiber is composed of steel fiber, plastic steel fiber and polypropylene monofilament fiber. The concrete is good in comprehensive mechanical performance of concrete crushing strength, splitting tensile strength, toughness, bend ductility and the like, low in fiber adding amount and wide in application range.

Description

technical field [0001] The invention relates to a building material, specifically a high-performance concrete containing composite fibers. Background technique [0002] With the continuous expansion of the application field of concrete structure and the increase of scale, the structural engineering develops in the direction of higher, larger span and heavier load, and the requirements for its performance are also higher. Fiber-reinforced concrete is a rapidly developing new type of composite material, especially steel-fiber-reinforced concrete and synthetic-fiber-reinforced concrete. Steel fiber has significant crack resistance, strengthening and toughening effects on concrete. Steel fiber concrete has been widely used in many engineering fields such as civil engineering and water conservancy. Synthetic fibers can prevent early shrinkage cracks of concrete and improve the durability of concrete. In view of the multi-component, multi-phase, and multi-level characteristics o...

AI Technical Summary

Problems solved by technology

In recent years, some relevant scholars have done experimental research on steel fiber-plastic steel fiber binary hybrid fiber concrete. The innovation point is that the polypropylene monofilament fiber is completely replaced by plastic steel fiber. The inhibitory effect on the generation and expansion of plastic cracks also disappears, and the toughness improvement of the matrix concrete in the later stage of cracking also has a certain degree of weakening effect, which shows that this kind of fiber mixing method still needs to be further improved to make the tensile strength of hybrid fiber concrete The extent of improvement in elongation toughness and flexural toughness increases

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