Effect of Aggregate Types on Thermal Conductivity and Durability of Self-Compacting Concrete

Abstract

This study seeks to develop a sustainable, eco-friendly, self-compacting concrete (SCC) distinguished by its thermal insulation and durability, as these attributes have become essential for modern construction. For this purpose, four self-compacting concrete mixtures were prepared, made with four types of gravel where (natural gravel 100 % NA, recycled concrete gravel 100 % RA, and natural pozzolan gravel 100 % PZA, in addition to mixing 50 % PZA + 50 % RA) were adopted. This paper evaluated the capillary absorption, porosity, thermal conductivity, thermal diffusion capacity and durability of self-compacting concrete. Given the significance of examining the endurance of SCC in hostile settings, the mass loss following immersion in 5% hydrochloric acid and 5% sulfuric acid was also analyzed. The findings suggest the feasibility of utilizing 100 % PZA and a combination of 50% PZA with 50% RA to manufacture self-compacting concrete with thermal insulation and durability in hostile situations. The values of thermal conductivity reduction were 36.4 % and 16.4 %, respectively, and the mass loss reduction of the two mixtures towards chloric acid was 49.6 % and 36.8 %, and sulfuric acid was 83 % and 38.3 %, respectively.