In many studies, LWA were combined with high strength cement paste to produce lightweight high performance concretes, e.g. . In such case, the high strength of the cement matrix allows to partially compensate for the low strength of the LWA . Further, the water contained in the LWA could deliver internal curing to the concretes with low w/c . Although we see a potential of the C-LWA also for such applications, this study is dedicated to ordinary-strength concrete (C20/25 -C30/37) because these concrete classes make up the largest amount of the market and could be a large carbon sink. Despite the reduction of strength and density, the concretes produced in this study could still be applied in structural applications. In fact, the concrete with C-LWA dry had lower effective w/c than the reference concrete and the strength drop was thus limited. This concrete could be still classified as belonging to the same strength class as the reference concrete, i.e. C30/37 according to Eurocode 2. The concrete with the presaturated C-LWA could be classified as belonging to strength class C25/30. Concretes of these strength classes are most commonly used in buildings.