Flexural and cracking behavior of reinforced lightweight self-compacting concrete beams made with LECA aggregate

Abstract

In the current research, an attempt was made to examine the flexural and cracking behavior of reinforced lightweight self-compacting concrete (LWSCC) beams incorporating light-expand- ed clay aggregate (LECA) as a partial replacement for natural coarse aggregate (NCA). Me- chanical properties such as compressive strength, split tensile strength, and flexural strength were evaluated, alongside fresh properties assessed using flow table, V-funnel, J-ring, and L-box tests. The study examined six beams, including a control mix, with LECA replacements of 5%, 10%, 15%, 20%, and 25%. The results indicate that compressive strength decreased with higher LECA content, from 44.56 MPa in the control mix to 32.73 MPa at 25% LECA. Flexural and split tensile strengths showed similar trends. Crack width increased with LECA content, from 1 mm in the control mix to 2 mm at 25% LECA, while density decreased. Flexur- al performance analysis revealed reduced ultimate load capacity and increased deflection with higher LECA proportions. The ductility index improved, suggesting enhanced flexibility. This study concludes that LECA can effectively replace NCA in LWSCC, though with a trade-off in strength and cracking behavior.