不同因素耦合作用下高强混凝土的冻融损伤规律研究

Study on the Rule of Freeze-Thaw Damage of High-Strength Concrete Under Coupling Effect of Different Factors

为研究高强混凝土在不同环境因素耦合作用下的冻融损伤规律,通过快速冻融循环试验测定混凝土试件的相对动弹性模量,推定试件相对应的冻融损伤因子,比较高强混凝土构件在不同环境因素下的冻融损伤失效过程,从而得出不同因素对高强混凝土冻融损伤的影响规律。结果表明,应力作用因素对高强混凝土在冻融循环过程中的相对动弹性模量损伤速度和劣化过程影响最大,材料性能的劣化最为明显。不同盐溶液环境因素对高强混凝土在冻融循环过程中的相对动弹性模量损伤速度和劣化过程影响依次为:(5%MgCl_2+5%Na_2SO_4)复合溶液<5%MgSO_4溶液<10%NaCl溶液。

In order to study the freeze-thaw damage law of high-strength concrete under coupling effect of different factors, the relative dynamic elastic modulus of concrete specimens was determined by rapid freeze-thaw cycle test, and the corresponding freeze-thaw damage factors were deduced, he freeze-thaw damage failure process of high-strength concrete components under different environmental factors was compared, and the effects of different factors on freeze-thaw damage of high strength concrete are obtained. The results show that the stress factors have the greatest influence on the damage rate and deterioration process of the relative dynamic elastic modulus of high-strength concrete during freeze-thaw cycles, and the deterioration of material properties is the most obvious. The relative dynamic elastic modulus damage rate and deterioration process of high strength concrete under freeze-thaw cycles are affected by different salt solution environmental factors in turn as follows： （5% MgCl2 ＋ 5% Na2SO4） composite solution 〈 5% MgSO4 solution 〈 10% NaCl solution.