冻融循环下透水再生混凝土力学性能损伤分析

为研究冻融循环作用对透水再生混凝土力学性能的影响,采用快冻法进行了不同再生粗骨料取代率下的透水再生混凝土冻融试验,并测试相应阶段的动弹性模量、抗折强度和立方体抗压强度.试验结果表明:透水再生混凝土的相对动弹性模量、相对抗折强度和相对立方体抗压强度均随冻融循环次数或再生粗骨料取代率的增大而下降,衰减速率从大到小依次为:相对抗折强度、相对立方体抗压强度和相对动弹性模量.以动弹性模量为损伤变量,通过数据拟合发现,透水再生混凝土的相对抗折强度、相对立方体抗压强度与损伤度均可用指数函数表示,且相关性较好.

Analysis on Mechanical Properties of Pervious Recycled Concrete by Damage under Freeze Thaw Cycles

In order to study the effect of freeze thaw cycle on the mechanical properties of pervious recycled concrete, the freeze thaw tests of pervious recycled concrete with different replacement ratio of recycled coarse aggregate were carried out by accelerated freezing method, and the dynamic elastic modulus, flexural strength and cubic compressive strength of the corresponding stage were tested. The results show that the relative dynamic elastic modulus, relative flexural strength and relative cubic compressive strength decrease with increasing the number of freeze thaw cycles, or increasing the replacement ratio of recycled coarse aggregate. The decay rate from large to small is relative flexural strength, relative cubic compressive strength and relative dynamic elastic modulus. Taking the dynamic elastic modulus as the damage variable, it is found that the relative flexural strength, relative cubic compressive strength and damage degree can be expressed by exponential function, and their correlation are good.