doi:10.16186/j.cnki.1673-9787.2020090039

Received:2020/09/08

Revised:2020/12/22

Published:2022/01/10

Analysis on fatigue life and toughness of basalt fiber reinforced concrete under bending load

HUANG Min , CHEN Gang , ZHAO Yuru

School of Civil Engineering, Henan University of Engineering, Zhengzhou 451191 , Henan, China

Abstract: In order to study the fatigue life equation and fatigue toughness of basalt fiber reinforced concrete (BFRC) under bending load,five groups of prismatic concrete beams were designed with five different basalt fiber volume percentages(0,0.1% ,0.2% ,0.3% and 0.4% ) ,and three-point bending fatigue tests were carried out under different stress level(0.6,0.7 and 0.8) .The experimental results showed that the flexural fatigue life of basalt fiber reinforced concrete with different content conformsed to the Weibull distribution of two parameters.Under the same stress level,the flexural fatigue life of basalt fiber reinforced concrete was much higher than that of plain concrete,and the flexural fatigue life of basalt fiber reinforced concrete increased with the increase of basalt fiber content.Through the parameter analysis of Weibull distribution,the double logarithmic bending fatigue life equation of basalt fiber reinforced concrete with different reliability probability requirements was obtained.With the increase of reliability probability of concrete,the corresponding fatigue life equation curve shifted to the left,which indicated that the fatigue life was decreasing.The fatigue toughness of basalt fiber reinforced concrete was analyzed on the principle of work done by load.The results showed that basalt fiber improved the fatigue toughness of concrete.The higher the fiber content was,the greater the relative fatigue toughness was.

Key words:basalt fiber reinforced concrete;bending load;fatigue life;reliability;fatigue toughness

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