EXPERIMENTS AND FAILURE CRITERION OF LIGHTWEIGHT AGGREGATE CONCRETE AFTER FREEZE-THAW CYCLING UNDER BIAXIAL STRESS OF SPLITTING TENSION AND COMPRESSION
Abstract：The strength experiments of lightweight aggregate(LWA) concrete after freeze-thaw cycling in seawater under biaxial splitting tension and compression stress are preformed. The failure characteristics of specimens and the direction of superficial cracking are researched. Based on the test results，the ultimate compressive and splitting tensile strengths varying with freeze-thaw cycles and stress ratio are analyzed. The failure criterion expressed in terms of principal stress after different freeze-thaw cycles and the unified failure criterion in octahedronal stress space considering of freeze-thaw cycling influence are proposed，respectively，which can provide the experimental and theory foundations for strength analysis of LWA concrete structures subject to tension and compression load in cold marine environment.
