Mechanical properties and fracture behavior of concrete made with sintered fly ash lightweight coarse aggregate and electric arc furnace slag as fine aggregate

The present work evaluates mechanical properties and fracture behaviour of concrete made with combination of sintered flyash lightweight coarse aggregate (SFA) and electric arc furnace (EAF) slag as fine aggregate. The mechanical properties and fracture performance of concrete has been evaluated at w/b of 0.6 and 0.4 for three concrete mix combinations namely (a) lightweight concrete with SFA and natural fine aggregate (b) lightweight concrete with SFA and electric arc furnace slag as fine aggregate (c) normal concrete with granite aggregate and electric arc furnace slag. The concrete mixes prepared are evaluated for compressive, flexural strength, split tensile strength, elastic modulus and stress strain curve behaviour. Fracture behaviour has been investigated on notched beams of size 100*100*500 mm under three-point bend test as per RILEM procedure for both normal weight and lightweight concrete. The plot of Load vs CMOD (Crack Mouth Opening Displacement) and Load vs displacement were used for evaluating the fracture behaviour of both types of concrete using various standards and RILEM recommendations. Fracture performance has been compared in terms of parameters such as modulus of elasticity, fracture energy, initial load compliance, stress-intensity factor, energy release rate, and characteristic length