Search Results for Roaa Abed Mukhlif

Abstract

The accumulation of large amounts of construction and demolition waste in Iraq, especially after the 2014 conflicts, has created a serious environmental problem. To achieve sustainable goals, recycling these materials in the construction sector supports the principles of the circular economy and reduces the demand for natural aggregates, as recycling represents one aspect of crisis recovery. This study investigates the mechanical performance and bond strength of Self-Compacting Concrete (SCC) containing demolition brick aggregate (DBA) and discarded brick aggregate (CBA) at 100% replacement ratios for fine and coarse aggregates, with and without 10% crumb rubber (CR) as a volumetric replacement for fine aggregate. Ten SCC mixes were designed and experimentally evaluated after 28 days. The results showed that adding 10% rubber to the reference mix resulted in a 13.5% decrease in compressive strength and a 16.8% decrease in bond strength. Complete replacement of natural aggregate with recycled brick aggregate resulted in significant decreases in compressive and bond strengths of up to 60% and 50%, respectively. Furthermore, incorporating crushed rubber into the recycled brick aggregate further decreased the compressive and bond strengths. The predominant failure patterns observed in the bond strength test were splitting and sliding failure. The combination of these two types of waste aggregate could promote the use of sustainable SCC in practical applications