Characterization of Moroccan coal waste: valorization in the elaboration of the Portland clinkerD. Belkheiri, M. Taibi, A. Diouri, A. Boukhari, A. Aride and O. SassiMATEC Web of Conferences, 11 (2014) 01009DOI: https://doi.org/10.1051/matecconf/20141101009