Acknowledgements

The authors thank Lafarge for the supply of cement, Holcim for the supply of natural aggregates and Colas for the supply of RCA. They also thank the China Scholarship Council for financial support. Finally, they thank the Government of Wallonia DGO6 for financial support through the project Beware Academia CONRePaD (Design of concrete with recycled concrete aggregates by means of packing density method).