Experimental study on bond properties between BFRP bars and recycled aggregate concrete
In order to explore the bond properties of basalt fiber reinforced bar(BFRP bar)and recycled aggregate concrete,the central pull-out test was carried out.Based on the test results,the failure mode and bond mechanism were explored,and the effects of recycled concrete strength grade,bar diameter and recycled aggregate replacement rate on the bond properties between BFRP bars and recycled aggregate concrete were studied.The results show that there are two failure modes of pull-out failure and splitting failure between BFRP bars and recycled aggregate concrete.The bond-slip curve of BFRP bar and recycled aggregate concrete can be divided micro-slip stage,slip stage,descending stage and residual stress stage.Increasing the strength grade of recycled concrete can delay the generation and evolution of internal cracks in concrete,further improve the mechanical interlocking between the surface ribs of BFRP bars and concrete,and increase the bond strength between BFRP bars and recycled concrete.Due to the shear lag effect,the bond strength between BFRP bars and recycled aggregate concrete decreases with the increase of the diameter of BFRP bars.The increase of recycled aggregate replacement rate will adversely affect the bond stress between BFRP bars and recycled aggregate concrete.
BFRP barrecycled aggregate concretebond propertiespull-out test
NETL
NSTL
万方数据
