التحقيق التجريبي في تأثير الركام الخرساني المعاد تدويره على مقاومة الضغط للخرسانة

الملخص

: Natural concrete aggregate (NCA) and recycled concrete aggregate (RCA) from demolished buildings were used in this study to produce sustainable concrete that reduces construction waste. Replacement ratios of NCA with RCA ranged from 0% to 100%. The study evaluates the effect of RCA on concrete properties, particularly compressive strength, to assess its viability compared with conventional concrete. Results showed that compressive strength decreases as the replacement ratio increases. At 50% RCA, the reduction was only 3.96%, while at 75% and 100% the reductions were 28.6% and 29.06%, respectively. RCA can therefore be used up to 50% without significant compromise in strength or ductility, while higher ratios may require mix design optimization.

Regarding durability, RCA mixes exhibited higher water absorption and porosity compared to NCA mixes, which may affect long-term performance. The use of supplementary cementitious materials and plasticizers can mitigate these effects and enhance durability.

The relative value of recycled concrete aggregate (RCA) depends on several factors, including density, shock resistance, and internal structural characteristics, all of which influence its suitability for industrial specialization and sustainable construction applications. These properties highlight the potential of RCA as an effective material when properly processed and incorporated into well‑designed concrete mixes.