A comparative study of sustainable mix incorporating recycled aggregates

ABSTRACT

This study compares concrete mixes incorporating different proportions of recycled aggregates (RA) as replacements for conventional coarse aggregates (0%, 10%, 20%, 30%, 40%, and 50%). It aims to evaluate their mechanical, durability, and environmental properties for practical use. Through a comprehensive experimental program, including tests on fresh and hardened properties, mechanical strength, and durability against water absorption, acid resistance, chloride ion penetration, and sulfate attack, the study assesses the performance of these sustainable mixes. Results show varied influences of RA incorporation on concrete properties, with lower replacement levels maintaining comparable mechanical strength and higher levels exhibiting strength reduction. Environmental assessments indicate significant reductions in embodied carbon and energy consumption with higher RA content. This comparative analysis informs optimal replacement levels for achieving sustainability without compromising performance, advancing understanding of sustainable construction practices, and promoting the adoption of eco-friendly materials in the construction industry.

Keywords:
Recycled aggregates; Workability properties; Strength properties; Durability properties