Punching Shear Capacity of Recycled Aggregate Concrete Slabs

Satjapan Leelatanon, Thanongsak Imjai, Monthian Setkit*, Reyes Garcia, Boksun Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

<jats:p>This article investigates the punching shear behavior of recycled aggregate concrete (RAC) two-way slabs. Ten 1500 mm × 1500 mm × 100 mm slabs were tested monotonically. Eight slabs were cast with RAC, whereas two control slabs were cast with natural aggregate concrete (NAC). The RAC incorporated coarse recycled concrete aggregate (RCA) at replacement levels of 25%, 50%, 75% and 100%. Two flexural reinforcement ratios (0.8% and 1.5%) were examined. The results show that the normalized punching shear strength of 100% RAC slabs decreased by 6.5% and 9% compared to NAC slabs for ρ = 1.5% and ρ = 0.8%, respectively. Doubling the amount of flexural reinforcement can increase the punching shear capacity of 100% RAC slabs by up to 45%. A punching shear database of 44 RAC slabs from literature and the 8 RAC slabs presented in this study revealed that the punching shear strength of RAC slabs predicted by ACI 318 was conservative, except for slabs with low reinforcement ratios (&lt;0.6%). The punching shear strength predicted by Eurocode 2 gave more conservative results for all levels of RCA replacement and all flexural reinforcement ratios. A yield-line analysis also showed that the failure mode of the RAC slabs was controlled by punching shear.</jats:p>
Original languageEnglish
Number of pages0
JournalBuildings
Volume12
Issue number10
Early online date1 Oct 2022
DOIs
Publication statusPublished - 1 Oct 2022

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