Test on Punching Behavior of Recycled Aggregate Concrete Slabs

Abstract:

Considering the recycled coarse aggregate (RCA) replacement percentage as the main parameter, the punching test on recycled aggregate concrete (RAC) slabs was performed. The loaddisplacement curve at the point of punching load, the strain of bottom steel bars, the strain of top concrete, the failure pattern and the punching bearing capacity were studied. Analysis results indicate that: with the increase of RCA replacement percentage, the deformation in each loading stage and the punching bearing capacity of the RAC slabs are reduced. Finally, the formula for punching bearing capacity of natural aggregate concrete slabs was modified and a new punching capacity formula of RAC slabs was proposed based on this test, which can be applied in the punching design of RAC slabs.

Key words:recycled aggregate concrete; slab; punching; replacement percentage of recycled coarse aggregate