Performance of Hybrid Fiber Reinforced High-Strength Concrete

Abstract

Abstract: In order to clarify the effects mode of hybrid ratio of steel fiber and polyvinyl alcohol fiber on the performance of high-strength concrete, the effects on workability, flexural strength, shrinkage, cracking resistance, resistance to chloride ion erosion were comparatively evaluated by slump test, mechanical strength test, shrinkage test, crack resistance test and chloride ion erosion resistance test. The following conclusions are drawn from the study. Steel fibers and polyvinyl alcohol fibers have a detrimental effect on the workability of fresh mixes. The addition of mixed fibers does not have a greater improvement effect on the mechanical properties of high-strength concrete than the addition of a single fiber, but it significantly improves the cracking resistance of concrete, with a maximum cracking area inhibition of 95.8%. Meanwhile, the addition of hybrid fibers reduces the shrinkage and permeability of high-strength concrete by 27.7% and 66.5%, respectively, indicating that the durability performance of high-strength concrete can be significantly improved. The mechanism of effects of fiber-reinforced concrete was explored by scanning electron microscope test, which shows that the improvement of the internal structure of the matrix by blended fibers realizes the improvement of macroscopic properties of concrete. Finally, 0.75% (volume fraction) steel fiber and 0.25% (volume fraction) polyvinyl alcohol fiber are recommended as the optimum admixture.

Key words: hybrid fiber, high-strength concrete, mechanical property, shrinkage, crack resistance, resistance to chloride ion erosion

CLC Number:

TU528

ZHAO Yaming, ZHANG Mingfei, ZHANG Zhen, LUO Yaofei. Performance of Hybrid Fiber Reinforced High-Strength Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2299-2307.

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