Structural Behavior of One-Way Reinforced SCC Slabs Made with a Variety of Recycled Aggregates under Repeated Load

Abstract

The paper reports an experimental investigation on the structural performance of sustainable one-way self- consolidation concrete (SCC) slabs including concrete or brick waste as partial substitute for coarse aggregate under static and repeated loading conditions. Six reinforced concrete slab specimens were evaluated utilizing self-consolidating concrete and several varieties of recycled material. All specimen slabs of 700 x 100 x 1700 mm with uniform reinforcement and configuration were fabricated. Two variables were examined in the experimental tests: the types of recycled aggregates and the applied load. A replacement ratio of 33% was employed in the specimen mixtures incorporating recycled concrete and bricks. Three specimens were subjected to static load testing, whereas the remaining specimens underwent testing under repeated loads. The deflection response, cracking loads, failure load, ductility index, and stiffness were analyzed. The test results reveal no substantial change in the examined variables between specimens containing recycled materials and those without. The reduction in the ultimate failure load during static loading was 0–3.3%. In the repeated load, the maximum failure load of the sample with recycled concrete diminished by 3.85%, whereas the maximum failure load of the specimen with recycled bricks augmented by 11.54%. The ductility and stiffness of these specimens decreased relative to the reference specimen after repeated loading. The recycled aggregate specimens demonstrate a noticeable reduction in ductility and stiffness after repeated loading compared to similar subjected to static loading.