EVALUATION OF THE COMPRESSIVE STRENGTH OF CONCRETE MADE USING RECYCLED CONCRETE AND WASTE CERAMICS AS AGGREGATES
Abstract
The rising demand for natural granite aggregates in concrete production, combined with environmental concerns, calls for sustainable alternatives. This study explores the potential use of waste ceramic tiles (WC) and recycled concrete aggregates (RCA) as substitutes for granite in concrete. Mechanical properties, specifically compressive strength, were evaluated and compared against granite-based concrete, serving as the control. RCA and WC, sourced from construction and demolition waste, were combined in ratios of 1:0, 3:1, 1:3, and 0:1 (WC). These aggregates were incorporated into concrete mixes with varying proportions of 1:1:2, 1:2:4, 1:3:6, and 1:4:8 (cement: fine aggregate: coarse aggregate), targeting nominal C30 concrete. A total of 384 concrete cubes (150 mm × 150 mm × 150 mm) were cast and cured for 7, 14, 21, and 28 days for compressive strength testing. Density and water absorption were also assessed to determine durability. Results reveal that both RCA and WC can effectively replace granite in non-structural or lower-strength applications. RCA exhibited superior compressive strength and lower water absorption than WC, attributed to its greater structural integrity. These findings highlight RCA’s suitability for sustainable construction, offering a practical means of reducing dependence on natural aggregates and minimizing the environmental impact of concrete production by reusing construction waste.
Keywords: Recycled concrete aggregate (RCA), waste ceramic tiles (WC), sustainable construction, concrete compressive strength, recycled aggregates, durability, environmental sustainability, construction waste recycling.
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