钢纤维对细再生混凝土力学性能的影响研究

Study the effect of steel fiber on mechanical properties of fine recycled concrete

为研究细再生集料(FRAP)替代天然细集料(NFA)的可能性。配置1%钢纤维掺量下不同FRAP含量(0%、25%、50%、75%、100%)的水泥混凝土,并测定成型后试件的抗压强度、拉伸特性、应力-应变特性和耐久性能。研究结果表明:以FRAP替代NFA会导致细再生集料水泥混凝的土力学强度降低;加入1%钢纤维,可以显著提高细再生集料水泥混凝土劈裂抗拉强度和抗弯强度,峰值应力增加约15%,峰值应变增加50%,韧性及延展性提高约5倍;以FRAP替代NFA的最佳含量为50%左右。

To investigate the possibility of replacing natural fine aggregate(NFA)with fine recycled aggregate(FRA),cement concrete with different FRA contents(0%,25%,50%,75%,100%)at 1%steel fiber admixture was configured and the compressive strength,tensile properties,stress-strain properties and durability performance of the formed specimens were determined.The results show that:replacing NFA with FRA leads to a decrease in the mechanical strength of fine recycled aggregate cement concrete;the addition of 1%steel fiber significantly enhances the splitting tensile strength and flexural strength of fine recycled aggregate cement concrete,increases the peak stress by about 15%,increases the peak strain by 50%,and increases the toughness and ductility by about 5 times;the optimum content for replacing NFA with FRA can be maintained at approximately 50%.