Drying Shrinkage and Creep Properties of Recycled Sand Concrete

Abstract

This study aimed to investigate the influence of recycled sand (RS) content and water-binder ratio on the long term performance of recycled sand concrete (RSC). A 220 days drying shrinkage and creep test of RSC was conducted, and the microhardness of ITZ were analyzed to explain the differences in performance. The experimental results indicate that, when RS content is 50%, the drying shrinkage and creep strain of RSC is the smallest. This is attributed to the highest microhardness in the ITZ when the RS content is 50%. When the RS content is 100%, the shrinkage and creep strains increase due to the high water absorption of RS, which leads to the evaporation of additional water and the deterioration of the ITZ. As the water-binder ratio increases, the drying shrinkage and creep strain of RSC with different RS content increases. According to the EC2 specification and the CEB-FIP specification, the drying shrinkage and creep prediction models for RSC have been established.

Keywords

recycled sand concrete / drying shrinkage / creep / ITZ / prediction model

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