Abstract
Punching shear behaviour of eighteen balanced Recycled Aggregate Concrete (RAC) scaled slab-column specimens is experimentally investigated and modelled using struts and ties for the following variables: concrete compressive strength (normal-, medium- and high-strength) and coarse recycled aggregate volumetric replacement level (0%, 50% and 100%). Irrespective of the variables, failure modes were similar across all specimens and the main punching-shear crack was inclined to the horizontal in the range of 28°–33°. Experimental punching strengths increased with concrete compressive strength though within a compressive strength they were practically independent of recycled aggregate replacement level. The experimental results have been used to calibrate a simple strut-and-tie punching strength predictive model and it is shown that amongst the selected design codes under appraisal, the Eurocode 2 gave relatively the most accurate and conservative predictions for the RAC punching strengths.
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