Use of recycled aggregates from different sources in the production of SCC. Part II: Hardened state properties

The mechanical resistance, water absorption, porosity and problems of dimensional variation due to shrinkage prove to be primordial and of great importance for evaluating of the durability of self-compacting concrete (SCC) based on recycled coarse aggregates. In part II of this study, ordinary gravel is partially replaced (50 and 100%) by recycled gravel for the preparation of eight compositions, with a constant water/binder ratio (W/B) = 0.4 and a binder dosage equal to 475 kg/m 3 . Physical and mechanical properties of SCC are evaluated through a number of laboratory tests. According to the findings of this study, the water absorption and porosity of SCC with recycled coarse aggregates are generally high, and can reach up to double that of the control SCC. Shrinkage of SCC is significant, however mechanical resistance is low compared to SCC with oridinary gravel. The results also suggest that, using binary mixtures can significantly improve the durability of SCC.