Parametric structural analysis of reinforced lightweight concrete beams for buildings

Abstract

Lightweight aggregate concrete (LWC) is an alternative to conventional concrete due to its versatility and its interesting thermal and acoustic insulation properties. In addition, lighter structural self-weight reduces the concrete volume in columns and foundations providing cost savings due to the reduction of steel reinforcement quantities. However, the reduction of concrete density leads to an increase in cement consumption to keep the required concrete compressive strength of beams and floor slabs. The present work aims to evaluate whether LWC is an economically and environmentally appropriate alternative considering the above factors. For this purpose, the design equations are presented and applied to a case study and a subsequent massive parametric analysis. From the results it can be concluded that LWC seems to constitute a sustainable alternative for densities not smaller than 1800 kg/m3. Lighter densities might have a positive effect but would require specific studies involving more parameters.