混杂纤维混凝土抗Cl-渗透性能试验研究

Experimental Study on Resistance to Chloride Ion Penetration of Hybrid Fiber Reinforced Concrete

采用改进的干湿循环浸泡法,对比研究了PE纤维混凝土、钢纤维混凝土和混杂纤维(PE纤维+钢纤维)混凝土的抗Cl-渗透性能。结果表明,纤维混凝土的抗Cl-渗透性与纤维总表面积之间存在线性相关性,纤维总表面积越大,混凝土抗Cl-渗透性能越差;PE纤维和混杂纤维混凝土的抗Cl-渗透性能低于普通混凝土,钢纤维混凝土的抗Cl-渗透性能高于普通混凝土;在混杂纤维总体积掺量不变的情况下,PE纤维的掺量越多,混杂纤维混凝土的Cl-渗透系数越大,抗Cl-渗透能力越差。

The resistance of PE fiber concrete,steel fiber concrete and hybrid fiber(PE fiber+steel fiber)concrete to chloride ion penetration was studied by the improved dry-wet cyclic immersion test.The results show that there is a linear correlation between the resistance to chloride ion penetration of fiber concrete and the total surface area of fiber in concrete.The resistance to chloride ion penetration of PE fiber concrete and hybrid fiber concrete is lower than that of ordinary concrete,while the resistance to chloride ion penetration of steel fiber concrete is slightly higher than that of ordinary concrete.Under the condition that the total volume of hybrid fiber remains unchanged,the more the content of PE fiber,the greater the permeability coefficient of chloride ion and the worse the permeability of chloride ion.