Abstract:Using prismatic specimens of concrete, the compressive properties of concrete exposed to freezing thawing cycles were examined. Impact of the cycle times, concrete grade and relative dynamic elastic modulus on compressive properties of concrete, including peak compressive stress, peak compressive strain, ultimate compressive strain were studied. Complete compressive stress stain curves were studied with the help of energy dissipating equipment, disk spring. The specimens were experienced 0, 25, 50, 75, 100 and 125 freezing thawing cycles. The strength grade of concrete is C20, C30, C40 and C50. Using cycle times and concrete grade as the criteria, the equations of compressive properties and the complete compressive stress strain curves for frozen thawed concrete are obtained, which are suitable for concrete with cubic strength of 2050MPa. The test results show that the energy dissipating equipment and disk spring perform quite well. With the increase of freezing thawing cycles, the stress strain curve becomes more flat, the peak stress decreases, the peak strain and ultimate compressive strain increase. With the increase of concrete grade, the effect of freezing thawing cycles reduces. Numerical results from the proposed constitutive model are in good agreement with the test results.