Use of recycled aggregates of concrete in total replacement of natural materials: Influence on the determination of concrete formulation parameters

The study presented here aims to develop the use of recycled aggregate issued of concrete in total replacement of natural materials (sand and gravel). In regard to natural aggregates, recycled concrete aggregates (RCA) contain mortar that influences theirs properties and those of concrete in which they are used (RCA). The objective of this work is to analyze the characteristics of concrete with 100 % of RCA. In this way, following an experimental analysis of physical, mechanical and mineralogical properties of recycled aggregates, these characteristics lead to suggesting adaptations on formulation parameters of concrete and mortar. Moreover, it was shown that the use of superplasticizers is necessary to reach satisfactory properties of concrete.