浸胶短切BFRC抗冻融性能试验

Experimental study on freeze-thaw resistance of soaking short-cut BFRC

针对浸胶短切玄武岩纤维对增强混凝土(BFRC)耐久性的作用,通过试验测试其相对动弹性模量和质量损失的方法,研究冻融循环对材料性能的不利影响,并进行回归分析。试验结果表明:掺入浸胶短切玄武岩纤维以后,改变了原有基材的力学性能。与普通混凝土相比BFRC经过冻融循环后其相对动弹性模量下降缓慢,而且其质量损失明显减缓,这与混凝土的内部结构改变直接相关。对于掺入固定体积率的浸胶短切BFRC的冻融循环次数与相对动弹性模量下降百分比、冻融循环次数与质量损失百分比之间的关系均可以用二次多项式回归公式进行预测,且拟合度很高。

In view of the effect of soaking short cut basalt fiber on the durability of concrete,the adverse effects of freeze-thaw cycle on the properties of concrete were studied by testing the relative dynamic modulus of elasticity and mass loss,and the regression analysis was carried out.The experimental results show that the mechanical properties of the original substrates are changed with the addition of soaking glue short cut basalt fibers.Compared with ordinary concrete,the relative dynamic elastic modulus of BFRC decreases slowly after freeze-thaw cycle,and its mass loss is obviously reduced,which is directly related to the change of internal structure of concrete.The relationship between freeze-thaw cycle times and relative dynamic elastic modulus and the relation between freeze-thaw cycles and mass loss percentage of BFRC with fixed volume ratio can be predicted by quadratic polynomial regression formula.And the fitting degree is very high.