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Recycled concrete aggregates (RCA) are mainly composed of an intimate mix between natural aggregates and cement paste and the complete separation between these two phases is difficult.Cement paste generally presents a much larger porosity than natural aggregates, the content and the physicochemical properties of cement paste therefore have a large influence on the properties of RCA.Any method seems to be adapted to the characterization of cement paste content (CPC) in fine recycled concrete aggregates (FRCA) especially for RCA containing calcareous aggregates.