In order to effectively assess mechanical property of concrete exposed to freeze-thaw cycles in sulfate environment

the degradation rule of mechanical property of concrete was studied under sulfate attack and freeze-thaw cycles.Based on the continuum damage mechanics and Ottosen four-parameter failure criterion

the damage failure model of concrete under sulfate attack and freeze-thaw cycles was established.The experimental results show that the peak stress and elastic modulus of concrete decrease and the peak strain increases gradually with the increase of freezethaw cycles.Moreover

the tension and compression meridian of concrete moves to the hydrostatics compressive axis

and concrete failure surface shrinks gradually with the increase of damage and the crack-resistant property of concrete reduces.The tension and compression meridian of concrete are significantly dependent on the types of sulfate solutions.At the same time of freezethaw cycles

the shrinkage degree of tension and compression meridian of concrete in magnesium sulfate solution is more obvious

indicating that the concrete deterioration by magnesium sulfate causes more aggressive corrosion.