Đánh giá hiệu quả kinh tế và môi trường của bê tông tự lèn sử dụng cốt liệu lớn tái chế và tro bay hàm lượng cao

Abstract

Construction activities generate a large amount of non-biodegradable solid waste, while also consuming a significant volume of natural aggregates and emitting a considerable amount of CO₂ into the environment. In the context of rapid urban infrastructure development in Vietnam, the research and application of sustainable construction materials-aimed at conserving resources, reducing costs, and protecting the environment-are receiving increasing attention. This study evaluates the economic and environmental efficiency of self-compacting concrete (SCC) using recycled coarse aggregates (RCA) and high-volume fly ash under Vietnamese conditions. The evaluation results show that SCC incorporating 100% RCA and 50% fly ash by binder weight (cement + fly ash) can achieve a material cost approximately 3.44% lower than that of conventional concrete of the same grade (BT300). At the same time, this solution helps reduce CO₂ emissions into the environment by around 21.3%. Thus, SCC using recycled coarse aggregates and high-volume fly ash is a feasible solution that not only optimizes construction costs but also significantly reduces CO₂ emissions and the exploitation of natural resources, contributing to the promotion of sustainable development.