Punching Shear Performance of Recycled Aggregate Concrete Slabs Reinforced with Thin Zigzag Steel Plates
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Abstract
With the growing environmental concerns associated with construction and demolition waste, research on Recycled Concrete Aggregate (RCA) and Recycled Aggregate Concrete (RAC) has gained momentum over the past few decades. The results, however, have been variable due to differences in the quality of RCA used. Nonetheless, most studies demonstrate the feasibility and potential of RCA as a substitute for natural aggregate, providing strength that meets the design standards of ACI 318. This article presents an experimental investigation of slabs composed of 100 percent RCA. Controlled RAC slabs measuring 1,200 × 1,200 × 12 mm were tested under monolithic simple at the middle column over eight simply supports. The test results revealed that the punching shear strength of the controlled RAC slab is lower compared to the one reinforced with thin zigzag steel plates. The plates, tested under impact shear stress, provided more accurate results according to Eurocode predictions and are suitable for all grades of recycled aggregate concrete with low flexural reinforcement.
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