碳纤维和EPS颗粒对RPC性能的影响

Effect of carbon fiber and EPS particles on the performance of RPC

研究了不同掺量(0、0.2%、0.3%、0.4%、0.5%、1.0%)的碳纤维(CF)全取代钢纤维(SF)对活性粉末混凝土(RPC)工作性的影响,优选出了适宜CF掺量;在此基础上,研究了EPS颗粒掺量(10%、20%、30%、40%、50%)对掺CF的RPC(CF-RPC)工作性、力学性能、干表观密度和导热系数的影响,并与同EPS颗粒掺量条件下掺SF的RPC(SF-RPC)性能进行了对比。结果表明:CF的适宜掺量为0.3%;随着EPS颗粒掺量的增加,CF-RPC试件的扩展度先增大后减小,抗压强度、抗折强度、干表观密度和导热系数均降低,韧性提升;与掺EPS的SF-RPC试件相比,掺EPS的CF-RPC试件的抗压强度较低,但韧性较好,干表观密度和导热系数均较低。

The effects of different content(0,0.2%,0.3%,0.4%,0.5%,1.0%)of carbon fibers(CF)fully replacing steel fibers(SF)on the workability of reactive powder concrete(RPC)were investigated,and a suitable CF content was preferred.On this basis,the effects of EPS particle content(10%,20%,30%,40%,50%)on the workability,mechanical properties,dry apparent density and thermal conductivity of RPC mixed with CF(CF-RPC)were investigated and compared with the performance of RPC mixed with SF(SF-RPC)under the same EPS particle content.The results show that,the suitable content of CF is 0.3%.With the increase of EPS particle content,the extensibility of CF-RPC specimen first increases and then decreases,the compressive strength,flexural strength,dry apparent density and thermal conductivity decrease,while the toughness improves.Compared with SF-RPC specimen mixed with EPS,CF-RPC specimen mixed with EPS has lower compressive strength but better toughness,and the dry apparent density and thermal conductivity are lower.