Abstract: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.