STRENGTH AND DEFORMATION PROPERTIES OF LYTAG CONCRETE UNDER LATERAL STRESS AFTER FREEZE-THAW CYCLE
The compressive strength and deformation tests for Lytag concrete specimens are carried out under 4 kinds of lateral stress levels and 4 stages of freeze-thaw cycle in a concrete static and dynamic tri-axial test system.The failure modes and superficial cracking characteristics of specimens are reported.The ultimate compressive strength and strain in the two loading directions under 4 different lateral stress levels,0,0.25 f c,0.50 f c,and 0.75 f c after 0,25,50,and 75 freeze-thaw cycles are measured.Based on the test data,the biaxial compressive strength and deformation properties of Lytag concrete varying with freeze-thaw cycles and lateral stress levels are systematically studied.Additionally,the biaxial compressive strength criterion for Lytag concrete in principal stress space is developed considering the effects of freeze-thaw cycle and lateral stress,which establishes the experimental and theoretical foundations for strength analysis of Lytag concrete structures subject to biaxial compressive load in cold marine environment.