Mechanism and Reliability Analysis of Sulfate Resistance of Recycled Concrete

Abstract

Abstract: Recycled aggregate concrete (RAC) was prepared by different mass admixture of recycled coarse aggregate (0%, 30% and 50%) and recycled fine aggregate (0% and 15%). The deterioration law of RAC mass and relative dynamic elastic modulus in sulfate dry-wet cycle test was studied. The sulfate resistance of RAC under different admixture was evaluated. The results show that with the increase of dry-wet cycles of sulfate, the relative dynamic elastic modulus increases first and then decreases, and the mass loss rate decreases first and then increases. The maximum relative dynamic elastic modulus loss of recycled coarse aggregate concrete reaches 60%, and the maximum mass increase is 0.43%, after 80 times of dry-wet cycles. In addition, the reliability model was established by Winner distribution. The evolution of RAC was evaluated under sulfate dry-wet cycle, and the morphology of RAC after erosion was analyzed by scanning electron microscopy (SEM).

Key words: recycled aggregate concrete, sulfate attack, relative dynamic elastic modulus, mass loss rate, Winner distribution, microscopic analysis

CLC Number:

TU528

DU Kangwu, WEI Wei, CAI Chenhui, SUN Xin, QIAO Hongxia. Mechanism and Reliability Analysis of Sulfate Resistance of Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4070-4076.

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