纤维混凝土盐冻损伤研究

Fiber Reinforced Concrete Salt-Frost Damage Research

对普通混凝土、聚丙烯纤维混凝土、PVA纤维混凝土以及混杂纤维混凝土进行快速盐冻循环试验。通过质量损失率和相对动弹性模量来分析不同种类纤维混凝土试样的盐冻损伤情况,并对试验数据分别进行多项式和指数拟合,建立纤维混凝土盐冻损伤演变方程。结果表明:在混凝土中掺加纤维有助于提高混凝土的抗盐冻性,其中混杂纤维混凝土抗盐冻的效果最好。纤维混凝土盐冻损伤演变方程中的多项式拟合精度高于指数拟合,说明该方程能较好的表征本试验纤维混凝土盐冻损伤演变过程。

Rapid salt freeze cycle tests were conducted on plain concrete,polypropylene fiber concrete,PVA fiber concrete,and hybrid fiber concrete.The frost damage of different kinds of fiber reinforced concrete specimens was analyzed by the mass loss rate and the relative dynamic elastic modulus.Polynomial and exponential fitting were performed on the experimental data,and the freezing damage evolution equation of fiber concrete was established.The results show that adding fiber in concrete helps to improve the salt-freeze resistance of concrete,the effect of hybrid fiber concrete was the best.The accuracy of polynomial fitting in the evolution equation of frozen damage in fiber reinforced concrete is higher than that of exponential fitting,which shows that the equation can better represent the salt freezing damage evolution process of fiber concrete.