Layachi BERREDJEM received his Eng. degree in civil engineering in 1989, his Ph.D. degree in 2018 from Badji Mokhtar - Annaba University, Algeria. He is now senior lecturer in the Department of Architecture at Badji Mokhtar - Annaba University, Algeria. His research interests include Recovery and recycling of construction and demolition waste. Properties of cementitious materials and their durability, mainly recycled ones. Technology of building materials especially innovative.