Abstract
Recycled concrete aggregates (RCAs) are utilized as recycled concrete wastes in the present structures of green concretes. The RCAs are sustainable concrete wastes that in the long run can substitute the demands for natural aggregates, processes that would in turn result to their preservations. The RCA use in concretes as full or partial substitutions of natural coarse aggregates (NCAs) is increasing interests in the building and construction sector because it minimizes the demands for natural aggregates. Besides, RCA utilization minimizes the adverse environmental impacts of virgin aggregate extractions from the natural resources and results in potential solutions to the ecological problems caused by concrete wastes. The aim of this paper is to critically review recycled concrete aggregates to produce ultra-performance concrete structures. This chapter provides a detailed review on RCAs application in concretes on the basis of the experimental information available in the published studies. In this chapter, the most significant chemical, physical, and mechanical features of recycled concrete aggregate are explained. Nevertheless, more focus has been given to explain the RCA effects on the concrete durability and fresh and hardened characteristics of the concrete. Also, this research identified the disparities existing in the current knowledge state on recycled concrete aggregates and natural concrete aggregates and offers some suggestions for future studies.
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