International Research Journal of Education and Technology

Concrete is widely employed as a primary construction material worldwide. It consists of elements that naturally occur in the environment, leading to a gradual depletion of these resources. To address this shortage, numerous research efforts have explored the utilization of various waste materials to partially replace cement, fine aggregates, and coarse aggregates in concrete production. Incorporating these waste materials not only aids in environmental conservation by reducing landfill waste, but also contributes to sustainable construction practices.

This study focuses on examining the properties of fresh and cured concrete when a portion of coarse aggregate is replaced with demolished aggregate. The outcomes of the investigation demonstrated that the optimal replacement percentage for Demolished Aggregate was identified as 35%. Subsequently, a concrete mix incorporating 35% demolished aggregate as a partial replacement was formulated, tested, and evaluated. The compressive strength of the mix after 28 days exhibited a 0.57% increase compared to the traditional mix. Similar trends were observed in the split tensile strength and flexural strength of the mixture, mirroring the improvements seen in compressive strength.

These findings suggest that incorporating demolished aggregates as replacements in suitable proportions can yield concrete with strength characteristics comparable to conventional mixes. Furthermore, utilizing the optimal replacement percentages for demolished aggregate is not only environmentally beneficial, but also economically advantageous, with potential cost savings of approximately 12% compared to the original mix..