Recycled aggregates concrete
mechanical properties and structural performance of slab-column connections
Keywords:
concrete, recycled concrete aggregate, mechanical properties, flat slab, punching shearAbstract
This paper examines the impacts of the total replacement of Natural Coarse Aggregates (NCA) by Recycled Concrete Coarse Aggregates (RCA) on the mechanical properties in concrete's fresh and hardened state. It also investigates the impact of RCA on the response and resistance of slab-column connections with and without shear reinforcement. The total replacement of NCA by RCA reduced by 21.8% and 37.1% the compressive and tensile strength of concrete for the concrete mix investigation. Variations in mechanical properties were observed in the concrete used for slab-column connections, but due to material heterogeneity, they could not solely be attributed to the use of RCA. Using concrete with 100% RCA reduced in 5.6% and 12.6% the punching strength of slabs without and with shear reinforcement. The load-displacement response and the cracking pattern of the slab-column connections were not affected by the use of 100% RCA.
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