路用钢纤维纳米混凝土粘结性能研究

Research on the Influential of SFNMRC to Reinforced the Bond-slip Constitutive

针对影响路用钢纤维纳米混凝土材料粘结强度的影响因素进行粘结实验分析,以五折线关系为基础,建立了基于钢纤维混凝土特征点的粘结强度计算模型,得到了不同钢纤维体积率的滑移-本构方程。研究结果表明:随着钢纤维掺入量与基体混凝土强度的不断提高,钢纤维纳米混凝土其所产生的粘结强度也会逐渐提高;钢纤维纳米混凝土应力-滑移曲线分为微滑移-滑移-劈裂-下降-残余五个主要阶段,得到初始滑移粘结强度钢纤维影响系数为4.49;相关系数为0.887 8;极限粘结强度下Losberg粘结试验和中心粘结试验的相关系数分别为α=15.709,α=16.528;β=0.145,β=0.168;同时,以五折线关系为基础,利用回归数学分析法,建立不同钢纤维体积率下的滑移-本构方程组,从而更好的解析路用钢纤维纳米混凝土的粘结性能。

Based on the analysis of bonding factors affecting the bond strength of steel fiber nano-concrete materials for road use,a bond strength calculation model based on the characteristic points of steel fiber reinforced concrete was established based on the relationship of the five-fold line,and the volume ratios of different steel fibers were obtained.The slip-constitutive equation.The results show that the strength of steel fiber nano-concrete will gradually increase with the increase of steel fiber incorporation and the strength of matrix concrete;the stress-slip curve of steel fiber nano-concrete is divided into micro-slip-Slip-cracking-descent-residue in the five main stages,and the initial slip bond strength steel fiber influence coefficient is 4.49;correlation coefficient is 0.887 8;correlation coefficient of Losberg bond test and center bond test under ultimate bond strengthα=15.709,α=116.552 8;β=0.145,β=0.168.At the same time,based on the relationship of the five-fold line,regression mathematical equations are used to establish the slip-constitutive equations for different steel fiber volume ratios,and thus better.The analytical road uses the bonding properties of steel fiber nano-concrete.