Abstract：In order to explore the change law of macro performance properties and pore structure of rubber pumice concrete under freeze-thaw cycles, the freeze-thaw cycles and uniaxial compression test were carried out. The frost resistance of rubber pumice concrete was analyzed by scanning electron microscope(SEM)and nuclear magnetic resonance(NMR)technology, and the prediction model of frost resistance of rubber pumice concrete was established. The results show that the addition of 0.12-0.18 mm rubber can effectively reduce the surface erosion, internal damage and the attenuation of mechanical properties of pumice concrete under freeze-thaw conditions. when the freeze-thaw time is 200 the mass loss rate of pumice concrete with 0.15mm rubber is the smallest, up to -0.14%, and the re-lative dynamic modulus of elasticity is the largest, up to 67.36%. Under the freeze-thaw cycles, the internal pores of rubber pumice concrete will deteriorate, the small pores gradually evolve to the large pores, and the harmless pores and less harmful pores evolve to the harmful pores and more harmful pores. The addition of 0.12-0.18 mm rubber particles can effectively inhibit the deterioration of pores and make the internal structure of concrete more compact. According to the prediction model of frost resistance of rubber pumice concrete, the frost resistance period of pumice concrete with 0.15 mm rubber is the longest, which is 12.76% longer than that of ordinary pumice concrete.
