Some Properties of concretes containing recycled aggregates

International Conference on Sustainable Structural Concrete, LA PLATA, ARGENTINE, 15-/09/2015 - 18/09/2015This paper presents the results of an experimental campaign which aimed at determining the viability of incorporating recycled aggregates from concrete, in the production of a new concrete, with acceptable performances for its use in new structures. Nine concrete mixtures with different recycled aggregates contents and with different water to binder (w/b) ratio were studied. The mean compressive strength for the reference concretes is comprised between 30 and 60 MPa. Tests were performed to measure compressive strength, porosity, chloride diffusion and gas permeability. The results indicated that the porosity of recycled aggregates concrete strongly depends on recycled aggregates contents. Chloride diffusion and permeability are also modified. For practical use, it is important to note that these durability properties can be improved by the optimization of the mix, in particularly the w/b ratio of the new concrete