Durability of concrete produced from internal curing concrete aggregate manufactured from industrial waste

Abstract

Modern buildings have made extensive use of Internal Curing (IC) for high-performance concrete (HPC). Nowadays, the rise of industrial waste has numerous negative repercussions on both society and the environment. Also, the building industry has seen numerous risks on the riverbank as a result of the increased demand for sand. Consequently, these issues can be resolved and the ineffective external curing of high-performance concrete with a lower w/c ratio can be reduced by replacing the fine aggregate with internal curing concrete aggregate (ICCA) made from industrial waste. Here, ICCA has previously been created using various industrial wastes. This study intends to evaluate the mechanical properties and durability of ICC constructed using two types of ICCA generated from waste materials to partially replace fine aggregate. Tests by the broadly accepted methods of mechanical and durability evaluations, such as compressive strength, workability, statistic modulus of elasticity, surface resistivity, rapid chloride ion penetration, water permeability, saturated water absorption, and initial surface absorption were conducted for industrial mix design, and high-performance mix design. Three types of curing samples; internal curing, external curing, and non-curing, were evaluated. The effects on durability and mechanical properties of concrete with these ICCA aggregates as a replacement material for fine aggregate are reported. ICC showed a 10 to 20 percent increment in a slump, 5 to 15 percent increment in compressive strength, 9 to 12 percent reduction in static modulus of elasticity, and a 9 to 17 percent increment in surface resistivity compared to the conventional concrete. Moreover, it showed lower penetration of chloride ion permeability, and lower initial surface absorption at 28 days. Further, ICC showed a slightly higher depth of penetration and saturated absorption initially and a reduction with time. Keywords - durability, internal curing aggregate, internal curing, fine aggregate, mechanical properties, industrial waste.