Properties of air-entrained concrete under compressive loads with constant confined stress after 0, 100, 200, 300 cycles of frccze-thaw were studied. Concrete cubes were tested under biaxial compressive stresses. Four constant confined stresses and four different cycles of freeze thaw were the main variables. Static compressive strengths were examined. Failure modes of specimens were also described. The experimental results show that the effect of freezing and thawing cycles on plain concrete do not change the failure modes. The formula of the biaxial compressive strength, biaxial tension-compression strength and biaxial tensile strength in principal stress space is proposed. It provides the experimental and theory foundations for strength analysis of air-entrained concrete structures subject to complex loads in cold environment.
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