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A Systematic Review of Recycled Aggregate Concretetowards Sustainable Construction

Shubham Rajput, Harsh Rathore

Abstract


This literature review traces the evolution of recycled aggregate use in concrete production, beginning with Germany's post-World War II recycling initiatives. The shift towards recycling in the USA, driven by resource concerns, led to the establishment of concrete aggregate specifications in 1982. The review underscores the importance of recycled aggregate characteristics, particularly water absorption, specific gravity, and adhered mortar content, in determining its impact on concrete properties. Notably, variations in aggregate size influence water absorption and concrete strength. The study also delves into the effects of parent concrete strength on recycled aggregate concrete (RAC) and reports lower compressive strength in RAC compared to natural aggregate concrete. The findings suggest that optimal parent concrete strength is crucial for maintaining RAC quality. Moreover, investigations reveal that the inclusion of fines in concrete significantly impacts strength, emphasizing the importance of aggregate size in mix design. The literature highlights the need for water absorption testing and discusses the impact of particle shape and texture on recycled aggregate. Despite observed strength reductions in RAC, the review indicates that high-quality parent concrete can produce comparable second-generation concrete. Finally, the study delves into durability aspects, noting potential decreases in compressive strength, moduli of elasticity, and durability with increased recycled aggregate content.


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References


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