基于快冻法的透水再生混凝土冻融试验及其力学性能研究

Freeze-thaw test and mechanical properties of permeable recycled concrete based on quick-freeze method

通过快冻法开展透水再生混凝土冻融试验,对不同再生粗骨料取代率下的动弹性模量、抗折强度以及立方体抗压强度进行测试,验证冻融循环作用对透水再生混凝土力学性能的影响。试验的结果表明,随着冻融循环次数或者再生粗骨料取代率的增长,透水再生混凝土的相对弹性模量、相对抗折强度以及相对立方体抗压强度三者都会随之下降,衰减速率由大到小依次为相对抗折强度、相对立方体抗压强度以及相对动弹性模量。将损伤变量定位为动弹性模量,利用数据拟合可知,运用函数来表现透水再生混凝土的相对抗折强度、相对立方体抗压强度以及损伤度,其相关性均较好。

It mainly uses the quick freezing method to carry out the freeze-thaw test of permeable recycled concrete.The test conditions are different recycled coarse aggregate replacement rates.At the same time,the dynamic elastic modulus,flexural strength and cubic compressive strength of each transformation are tested.The test results show that with the increase in the number of freeze-thaw cycles or the replacement rate of recycled coarse aggregate,the relative elastic modulus,relative flexural strength and relative cubic compressive strength of permeable recycled concrete will decrease.Among them,attenuation The relative flexural strength,the relative cubic compressive strength and the relative dynamic modulus of elasticity are the order of the speed from large to small.Positioning the variable as the dynamic elastic modulus,using data fitting shows that the relative flexural strength of the permeable recycled concrete,the relative cubic compressive strength and the degree of damage,have good correlations.