High-Strength Lightweight Concrete Using Leca, Silica Fume, and Limestone

Research paper by Fathollah Sajedi, Payam Shafigh

Indexed on: 18 Apr '12Published on: 18 Apr '12Published in: Arabian Journal for Science and Engineering


This paper determines mix proportions of high-strength structural lightweight concrete (HSSLWC), which reduces the weight of concrete by using expanded aggregate clay (Leca). In order to produce HSSLWC, mineral and chemical admixtures have been used along with limestone that reduces porosity and increases strength. Tests for specific gravity, and compressive, indirect tensile and flexural strengths were carried out on the specimens. The effect of curing on the compressive strength was investigated by keeping some specimens in open air. The results obtained showed that by using Leca, a lightweight structural concrete (LWSC) can be achieved, with dry density in the range of 1,610–1,965 kg/m3 and compressive strength in the range of 34–67 MPa, based on cube specimens with 100 mm side length. Limestone significantly improved the mechanical properties of concrete whenever mixed with lightweight aggregates.