Behavior of Steel-Fiber Reinforced Lightweight Self-Compacting Concrete Containing LECA after the Exposure to Internal Sulfate Attack

For many years, lightweight concretes (LWC) have been utilized successfully in the construction of buildings because their low specific weight, high thermal insulation capacity, and sound insulation. The development that led to self-compacting concrete (LWSCC) is a significant step forward recent years. These chains concrete's beneficial properties with concrete. purpose this experimental investigation determine how internal sulfates attack effect fresh hard made by using expanded clay aggregate (LECA) before after addition 0.5 volume fraction (V f ) steel fibers. In fine aggregate, several mixes were cast different SO 3 percentages (0.34, 2, 4, 6%). LWSCC tested, such as (slump, sieve segregation resistance, L-box test). (Compressive, splitting tensile strength, flexural oven-dried density, modules elasticity). results showed presence affects LWSCC. A decrease (2, 6%) aggregate. addition, mechanical (compressive St., modulus elasticity) decreased curing age increased, % increased. When sulfate percent rose from (0.34% 2%, 4%, compressive reduction was (16.53, 22.45, 26.47%) at 120 days. Adding 0.5% V fiber enhanced