Influence of lightweight aggregates on the physical and mechanical residual properties of concrete subjected to high temperatures

This research studies the high temperature behavior of lightweight aggregate concretes (LWAC) by providing a comprehensive study that regroups physical, thermo-mechanical and mechanical properties three different LWACs. Then these are compared to normal-weight concrete (NWC) as well those mortar phase concretes, thus, enabling us isolate identify specific behaviors aggregates (LWA). Contrary normal weight aggregates, LWAs showed compatibility in thermal strain with phase, which led fewer cracks interfacial transition zone (ITZ) it resulted divergence between LWACs NWC, particularly for residual permeability tensile strength values. While generally exhibited lower decrease failure strengths, Young Modulus than NWCs, its Poisson’s ratio was greatly decreased after 300 °C.