波纹型钢纤维对RAC性能增强试验研究

Experimental study on RAC performance enhanced by corrugated steel fiber

为了研究波纹型钢纤维对RAC力学性能增强效果,在再生骨料替代率50%和100%的RAC掺入不同量波纹型钢纤维进行了力学强度、延展性以及钢纤维掺量与力学强度关系的研究,研究结果表明:钢纤维掺量分别为0.5%、1%、1.5%时,再生骨料替代率50%的RAC抗压强度相比于再生骨料替代率100%依次增长了7.08%、9.90%、9.32%;劈裂抗拉强度依次增长了23.88%、25.06%、32.36%;再生骨料替代率分别为50%和100%的RAC掺入不同量的钢纤维后其抗压强度、劈裂抗拉强度均高于未掺纤维的RAC;钢纤维掺量大于1%后,再生骨料替代率50%和100%两者立方体抗压强度均呈现增长趋势,在掺量1.5%强度补强效果较为明显;各钢纤维掺量下再生骨料替代率50%的RAC压拉比小于再生骨料替代率100%的RAC压拉比,其中再生骨料替代率50%和100%的RAC分别在钢纤维掺量1.5%和1%时延展性较为明显。

In order to study the effect of corrugated steel fiber on the mechanical properties of Rac,the mechanical strength,ductility and the relationship between the content of steel fiber and the mechanical strength of Rac with 50%and 100%recycled aggregate substitution ratio were studied.The results show that when the amount of steel fiber is 0.5%,1%and 1.5%respectively,the RAC compressive strength with 50%recycled aggregate replacement ratio increases by compared with 100%recycled aggregate replacement ratio 7.08%,9.90%,9.32%.The splitting tensile strength increased by 23.88%,25.06%,32.36%.The compressive strength and splitting tensile strength of RAC with recycled aggregate substitution rate of 50%and 100%were higher than those of RAC without recycled aggregate.When the content of steel fiber was greater than 1%,the replacement rate of recycled aggregate was 50%and 100%,and the cube compressive strength of RAC with recycled aggregate substitution rate of 1.5%was higher The RAC compression ratio of 50%recycled aggregate substitution rate is less than that of 100%recycled aggregate substitution rate,and the ductility of 50%recycled aggregate substitution rate and 100%recycled aggregate substitution rate is more obvious when the steel fiber content is 1.5%and 1%,respectively.