Improving sustainability of precast concrete sandwich wall panels through stone waste aggregates and supplementary cementitious material

Kumar, Pushpender
Kumar, Rajesh
Nighot, Nikhil Sanjay
Surabhi, Surabhi
Rahman, Mohd. Reyazur
Chidambaram, R. Siva
Khan, Shahnawaz

Applied Engineering and Technology
Vol 3, No 2 (2024): August 2024

This study aims to enhance the sustainability of precast concrete sandwich wall panels by replacing 100% of natural aggregates with stone waste and 30% of cement with supplementary cementitious materials. The panels, consisting of two 60 mm thick concrete wythes reinforced with 1% steel fibers, were connected using basalt fiber-reinforced polymer (BFRP) connectors and separated by high-density expanded polystyrene (EPS) insulation (30 kg/m³). Full-scale panels were tested for flexural strength, showing that the inclusion of sustainable materials increased the failure load by 96% compared to conventional panels, with steel fiber-reinforced panels achieving a failure load of 110.5 kN. Panels incorporating stone waste aggregates demonstrated a 71% increase in strength compared to control samples. These results highlight that using stone waste and supplementary materials not only improves environmental sustainability but also enhances structural performance, making these panels a viable option for eco-friendly construction.