Uso de residuos de construcción y demolición como material cementicio suplementario y agregado grueso reciclado en concretos autocompactantes

Abstract

In the last year, the use of self-compacting concrete (SCC) has been increasing since its start due to the capacity it has to fill formwork with a high density of steels, so the use of this type of concrete in the elaboration of reinforced thin walls would be a solution to incomplete filling of this type of prefabricated elements. On the other hand, the use of masonry residue (RM) and recycled coarse concrete aggregate (AGR) from construction and demolition waste (CDW) as a replacement for cement and coarse aggregate respectively would give a sustainable approach to self-compacting concrete. This study aimed to evaluate the influence of CDW on the properties in the fresh state (slump flow, V-funnel, and L-box) and hardened state in cylindrical specimens (compressive strength and splitting tensile strength) and in walls (diagonal tension strength). The mixtures of CAC show that when Portland cement and natural aggregate are replaced by RM and AGR respectively, the concrete can meet the requirements of the European guidelines of the European Federation of National Associations Representing producers and applicators of specialist building products for Concrete (EFNARC). In the hardened state, CACs with CDW achieved acceptable performance compared to the reference mixture (CAC-reference). All mixtures achieved compressive strength greater than 21 MPa suitable for house walls according to (NSR 10).