BIAXIAL COMPRESSIVE BEHAVIOR OF CONCRETE SUBJECTED TO NON-PROPORTIONAL LOADS AFTER SUFFERING CYCLES OF FREEZING AND THAWING IN SEAWATER

Using the method of quick freezing and thawing, this paper performs the biaxial compressive tests of plain concrete specimens, which have suffered 0, 25, 50 and 75 cycles of freezing and thawing respectively in 3.5% sodium chloride solution imitated seawater. The tests are completed by means of the large static-dynamic triaxial test system for concrete and under four definite lateral stress rates with non-proportional loads. According to the testing result, the biaxial compressive strength and deformation characteristics of concrete are studied systematically, thus the failure criterion of concrete subjected to non-proportional loads after suffering corrosive cycles of freezing and thawing is established in the stress-strain system.