Environmentally-friendly self-compacting concrete for rehabilitation of concrete structures

For this purpose, in previous works (Corinaldesi & Moriconi 2003, Corinaldesi & Moriconi 2004a, Corinaldesi & Moriconi 2004b) rubble powder (that is a powder obtained from a suitable treatment of rubble from building demolition) was used as mineral addition in order to ensure adequate rheological properties of the self-compacting concrete in the absence of any viscosity modifying admixture, which is usually employed to guarantee sufficient cohesiveness of the self-compacting concrete (Khayat & Guizani 1997, Khayat 1997). In fact, in the absence of any viscosityenhancing admixture (Khayat 1999), a lower water to cementitious material ratio is necessary to provide stability and, consequently, some fillers (passing the sieve ASTM n◦100 of 150 µm) must be employed.