The addition of by-products, such as recycled concrete aggregate and ground granulated blast furnace slag, modify the in-fresh flowability ordinary self-compacting both initially over time. A detailed study is presented in this paper 18 mixtures (SF3 slump-flow class) containing 100% coarse aggregate, two types cement (CEM I or CEM III/A, latter with 45% slag), different contents fine (0, 50, 1...