A hybrid fiber reinforced concrete

Abstract

The invention discloses hybrid fiber reinforced concrete, that is to say, stressed reinforcing steel bars, modified polypropylene coarse fibers and polymeric fine fibers are used in the concrete in cooperation.The modified polypropylene coarse fibers are prepared through melt stretch after modification with an organic modifying agent, a silane coupling agent and an inorganic modifying filler.The polymeric fine fibers are capable of preventing the original concrete defects and microcrack expansion, and the modified polypropylene coarse fibers are capable of effectively limiting and delaying the occurrence and development of macrocracks.When the two fibers are used simultaneously in the concrete, the hybrid fiber reinforced concrete can have better shock resistance, crack resistance and abrasion resistance compared with constructional reinforcement, and replace the constructional reinforcement accordingly, and therefore, carbon emission generated during reinforcing bar production is significantly reduced.In addition, the two fibers are used in cooperation with the stressed reinforcing steel bars, the quality and durability of concrete work are greatly improved, and the service life of the concrete work is prolonged.

Description

technical field [0001] The invention belongs to the field of building materials and relates to concrete, in particular to a hybrid fiber reinforced concrete. Background technique [0002] Concrete is made by mixing cement, sand, stone and water, admixture materials and admixtures in a certain proportion. After solidification, it is as hard as stone, with good compressive ability, but poor tensile ability, and is easy to break due to tension. In order to solve this contradiction and give full play to the compressive capacity of concrete, a certain number of stressed steel bars are often added in the tensile area of ​​concrete or corresponding parts, so that the two materials are bonded into a whole and jointly bear external forces. However, the unreinforced part of the concrete is still plain concrete, which will cause cracking and wear due to concrete shrinkage, creep and external impact. Concrete cracking reduces the protection of stressed steel bars, which can cause corr...

AI Technical Summary

Problems solved by technology

However, polypropylene coarse fibers are hydrophobic and have low adhesion to concrete, thus greatly reducing the reinforcing effect of the fibers

In order to improve the bonding force between fibers and concrete, fibers are often subjected to heterogeneous treatment or surface indentation treatment, but this treatment will seriously reduce the strength of fibers

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