Experimental investigation on bond-slip behaviour between geopolymer recycled brick aggregate concrete and rebars
To solve the problem of collaborative work between geopolymer recycled brick aggregate concrete(GRBC)and rebars,pull-out tests were conducted on 96 specimens of GRBC with deformed rebar in this paper.The effects of parameters such as recycled brick aggregate(RBA)replacement ratio.(0,25％,50％,75％,100％),slag content(25％,40％),water-to-binder ratio(0.45,0.5,0.55),rebar diameter d(12-22 mm),relative concrete cover(2.63,4.19,5.75),bond length(1d-8d)and curing conditions(ambient temperature,80 ℃ for 24 h)on bond performance were investigated.The test results show that higher concrete cover,smaller rebar diameter or smaller bond length can increase the bond strength and effectively prevent splitting failure.With the increase of slag content or the decrease of water-to-binder ratio or using 80 ℃ curing,the compressive strength,tensile strength and bond strength of GRBC are improved,and the slip at peak bond stress increases,but the specimen is more prone to splitting failure.Increasing RBA replacement ratio results in the decline in bond strength,and the bond strength reduces by 19.77％-30.6％when RBA replacement ratio is 50％,and reduces by 37.0％-49.63％when RBA replacement ratio is 100％.Based on the test results,the bond-slip model for GRBC with deformed rebar was developed,and the predicted results agree well with the test results.
geopolymer concreterecycled brick aggregatedeformed rebarpull-out testbond strengthbond-slip model
国家科技期刊平台
NSTL
万方数据
维普
