Normal and high-strength lightweight self-compacting concrete incorporating perlite, scoria, and polystyrene aggregates at elevated temperatures
American Society of Civil Engineers
Place of Publication
School of Engineering
Lightweight self-compacting concrete (LWSCC) is an advanced concrete that combines the advantages of both lightweight concrete (LWC) and self-compacting concrete (SCC). This concrete provides an excellent solution to decreasing the self-weight of a structure while making pouring easier and removing the construction challenges and complications. This study examined the impact of elevated temperatures on normal-strength lightweight self-compacting concrete (NSLWSCC) and high-strength lightweight self-compacting concrete (HSLWSCC) through its residual properties vis-à-vis compressive and tensile strengths, modulus of elasticity, mass loss, and spalling intensity. LWSCCs were designed using lightweight aggregate (LWA), which replaced coarse and fine aggregates at certain percentages. Three types of LWA used in this study are scoria, perlite, and polystyrene. Mixes consisted of six NSLWSCCs (50% and 100% scoria, 50% and 100% perlite, 20% and 30% polystyrene) and two HSLWSCCs (50% scoria). The residual properties were measured by heating 100 × 200 mm cylinder specimens to 100°C, 300°C, 600°C, and 900°C. The result shows that the NSLWSCCs tend to achieve maximum strength at 100°C and then gradually decrease as the temperature increases. But in the case of HSLWSCCs, maximum strength was achieved at 300°C.Minor spalling with bubbles, holes, and cracking was observed at only 900°C in the NSLWSCC, while a major explosion occurred at 300°C in the HSLWSCC. The overall result indicates that the magnitude of loss of strength, mass loss, and intensity of spalling is proportional to temperature after a certain point. This study shows how the strength and thermal stability of LWSCC made from scoria, perlite, and polystyrene changes after exposure to high temperatures.