钢纤维混凝土界面黏结强度研究

Study on Interfacial Bond Strength of Steel Fiber Reinforced Concrete

界面层在钢纤维增强混凝土中扮演着重要角色,它是维系钢纤维混凝土两相材料应力传递的纽带,直接影响钢纤维的作用效果。本文结合复核材料理论,对钢纤维混凝土的界面微观特征进行了分析,通过劈裂、单轴抗压强度试验验证了钢纤维不同的分布状态对混凝土强度的影响。针对钢纤维拉拔试验结果,通过极差分析对各个因素对钢纤维混凝土抗拉强度的影响效应进行了排序,同时提出采用钢纤维数量代替钢纤维体积率进行基体抗拉强度计算更为准确,可供钢纤维混凝土强度试验参考。

Interfacial layer,which plays an important role in steel fiber reinforced concrete(SFRC),maintains the stress transfer of SFRC two-phase material and directly affects the performance of SFRC.Based on the theory of composite material,this paper analyzes the microscopic characteristics of interface of steel fiber reinforced concrete,and verifies the influence of steel fiber in different distribution on the strength of concrete through splitting and uniaxial compressive strength tests.According to the steel fiber pull-out test results,the influence of various factors on the tensile strength of steel fiber concrete was sorted through range analysis.At the same time,it is proposed that calculation of the tensile strength is more accurate when the number of steel fibers instead of the volume ratio of steel fibers are used.This proposal can be used as reference for the strength test of steel fiber concrete.