Effect of (LECA) as a Partial Replacement on Some Properties of Glass Fiber Reinforced Self-Compacting Concrete Exposed to Fire Flame

Abstract

Abstract This study evaluates fresh and hardened glass fiber reinforced self-compacting concrete (GFRSCC) characteristics. This study used 594 kg/m3 binder in self-compacting concrete. Four GFRSCC concrete mixes were conducted utilizing LECA in place of coarse aggregate at volumetric replacement ratios of (0, 20, 40, and 60) %. Fresh concrete characteristics were tested using (slump flow, V-funnel, L-Box, and segregation index) tests. Hardened concrete is tested after 7, 28, and 56 days of cure. These tests measure compressive, splitting, and flexural strengths. The results show that LECA content increases workability. Compressive, flexural, and splitting tensile strengths fall significantly compared to the reference mixture as LECA percentage increases. Compressive strength decreased the most at 60% LECA, with (50.86, 43.25, and 36.63) % declines at 7, 28, and 56 days, respectively. Flexural strength decreased (46.56, 38.14, and 33.98) % at 7, 28, and 56 days, respectively. Splitting tensile strength decreased (54.68, 48.90, and 45.97) % at 7, 28, and 56 days, respectively. After being burned at (300, 500, and 700) °C, the specimens cooled gradually before being tested again. Strength retention after burning improved with the increase of LECA replacement in the mixture. After burning at 700 °C, residual compressive, flexural, and splitting tensile strengths were (28.43, 30.21, 31.36, and 34.22) % and (16.89, 28.16, 39.27, and 51.97) % and (15.94, 27.7, 39.72, and 50.32) % for replacement ratios of (0, 20, 40, and 60) %, respectively.