Test study on physical characteristics of rock under freezing-thawing cycles

The mechanical characteristics of rock are some different between fresh rock and weathering rock. Especially when weathering degree of rock is quite high, the mechanical characteristics of rock obviously declined. In rock engineering many weathering rocks are used as foundations; it is essential to study and understand mechanical characteristics of weathering rocks. The change of the temperature is mainly reason of weathering especially freezing-thawing cycle. In this paper marble and sandstone from Jiaozuo were divided two groups: dry group and water saturation group. And the freezing-thawing cycle test was made to simulate weathering of rock. The mass of rock were recorded and the P-ultrasonic velocity testing was made throughout test including non-freezing-thawing, after every ten times freezing-thawing cycles, the total times of freezing-thawing cycles are 50. We analyze the change of physical and mechanical characteristics of rocks under freezing-thawing cycles.