Experimental Study Light Weight Concrete Using LECA, Silica Fumes, and Limestone as Aggregates

Abstract: This dissertation determines the mix proportions of high-strength lightweight concrete, which uses expanded aggregate clay to decrease the weight of the concrete (LECA). Mineral and chemical admixtures have been used to reduce porosity and enhance strength in order to create light weight concrete. With that some percentage of silica fumes is added to enhance the properties of concrete and to make workability stable. On the specimens, specific gravity, compressive, indirect tensile, and flexural strengths were determined. By exposing certain specimens to air, the impact of curing on compressive strength was studied The findings indicate that by including Leca, a lightweight concrete with a dry density of 1,600– 1,960 kg/m3 and a compressive strength of 35–66 MPa may be produced, based on cube specimens with a 150mm side length. When used with lightweight particles, limestone significantly improved the mechanical characteristics of concrete.