Abstract
By changing the replacement percentage of recycled coarse aggregate (RCA) (0%, 50%, 100%), the basic creep performance and total creep performance of recycled aggregate concrete (RAC) were studied. The experimental results reveal that increasing the RCA replacement percentage can both increase the basic creep deformation and total creep deformation of RAC with the RCA having a bigger impact on the basic creep of RAC. Based on the experimental research and studies on the interaction mechanism of natural coarse aggregate (NCA), old mortar and new mortar in the creep process of RAC, a calculation model of the relationship between the creep of the old mortar, new mortar and the RAC (ONRM) was established. The creep of the old mortar in the RAC was calculated by using the ONRM. Based on this, a two-dimensional random convex aggregate model of the RAC was established with ANSYS finite element software, and the creep of the RAC was calculated. The results of the calculation showed that the ONRM could well reflect the relationship between the creep of the old mortar, new mortar, and the RAC. From above analysis, with ACI 209(92) model as the benchmark, a creep prediction model reflecting the content and performance of the old mortar was built. It is proven that this model can calculate the creep of RAC well.
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