Punching Behaviour of Flat Slab Using Recycled Aggregate

Abstract

Recently, researchers have shown an interest in researching recycling aggregates from old concrete and using them in new construction as a means of protecting the environment and natural resources. This thesis includes an experimental investigation into the punching shear behaviour of continuously supported slabs of concrete with natural and recycled coarse aggregate. In the Laboratory at the MS Ramaiah Institute of Technology the tests on punching shear behaviour of inner slab-column connections in flat plates. ''Natural and recycled'' aggregates were used in six two-way slab models. The slabs were made to only fail while being used as a punching shear. Three specimens of recycled aggregate concrete (RAC) slabs and three specimens of natural aggregate concrete (NAC) slabs were used in the experimental study. Simply supported on four edges, all of the slabs were tested using a central patch load. In order to attain a 25 MPa concrete strength after 28 days, the IS mix design technique was used. For each aggregate size of 12.5mm (Downsize), five concrete mix proportions were used with (0%, 25%, 50%, 75%, and 100%) replacement of natural coarse aggregate with recycled coarse aggregate. Then, casting with a size of 1000 × 1000 × 100 mm was tried with 0% and the highest of the other four (75%). The test findings were then compared with the experimental data and the Codal Provisions for the Accuracy of Ultimate load.