Study of the Possibility of using Recycled Aggregates in the Production of Environmentally Friendly Concrete

Abstract

Concrete waste resulting from demolition and war remnants is considered one of the most important challenges facing the environment and society, It is waste that contains coarse aggregate (gravel), cement, and chemical elements containing oxides and silica, which amount to 80%, and they are relatively live, unextinguished oxides that interact in the presence of moisture and air, because they are incompletely interacted and are considered very harmful to soil and groundwater in the event of their leakage. Therefore, it is clear that the environmental impact of these wastes is a concern that requires a sustainable solution. In light of the frightening depletion of natural resources on the planet, the need arose for the technology of recycling these wastes and using them again to achieve environmental balance and sustainability by meeting the requirements of the current reality without neglecting the ability of future generations to meet their needs. In this study, recycled coarse aggregate (RA), from recycled building waste, was used to make environment-friendly concrete (RAC) with different replacement percentages by weight (30%, 50%, 70%, 100%) as an alternative to natural aggregates (NA), in order to verify the feasibility of using this type of concrete (RAC) compared to natural concrete (NAC). The results of this study showed that the use of (RA) affects the properties of concrete (RAC), and that the greater the replacement ratio, the lower the properties of concrete (RAC) compared to the properties of ordinary concrete (NAC), however, the decrease was not significant when using a replacement ratio that ranged between (0-50%), a percentage that encourages the use of this type of aggregate (RA) in the production of concrete (RAC) to achieve environmental benefit and meet the needs of the current population and preserve the needs of future generations