弯拉荷载作用下ECC抗盐冻性能试验研究

Experimental Study on Salt Freezing Resistance of ECC Under Bending and Tensile Load

为研究高延性纤维增强水泥基复合材料(ECC)在弯拉荷载作用下的抗盐冻性能,进行了ECC小梁试件的盐冻试验,分析了荷载作用下盐溶液浓度、加载挠度、不同弯矩位置对其抗盐冻性能的影响。试验研究表明,3%盐溶液浓度下ECC试件的相对动弹性模量损失最严重,且极限抗拉强度下降幅度最大,表明该溶液浓度下试件的盐冻损伤最为严重;盐溶液浓度及加载挠度的增大均会增加氯离子侵蚀深度,且同一试件随着不同位置处弯矩的增大,氯离子侵蚀深度增加。

In order to study the salt-freeze resistance of high ductility fiber-reinforced cementitious composites (ECC) under flexural and tensile loads,the salt freezing test of ECC trabecular specimen was designed, and the effects of salt solution concentration, loading deflection and different bending moment position on the salt-freezing resistance were analyzed. The experimental results show that the relative dynamic elastic modulus of ECC specimen is the most serious at 3% salt solution concentration, and the ultimate tensile strength decreases the most,indicating that the salt freezing damage of the specimen is the most serious;the increase of salt solution concentration and loading deflection will increase the chloride erosion depth, and the chloride ion erosion depth increases with the increase of bending moment at different positions of the same specimen..