Life cycle assessment of sustainable concrete made with recycled aggregates

The results of an environmental study on concrete manufacture that follows the standard protocol of life cycle assessment are shown in this document. The study has been done for seven types of concrete: one conventional and six containing cement kiln dust (10%), marble sludge (10%) and demolition waste (10%, 80% and 100%) respectively, in partial or total substitution of natural aggregate. Six end of life scenarios have been proposed for the application of the life cycle assessment methodology. One of these is referred to the complete disposal of the waste obtained from demolition of studied concrete while in the others the treatment and recycling of demolition waste are analysed. In the latter cases the treatment plant location has been considered at different distances from the demolition site. The results show that, the life cycle of the considered concrete mainly impacts on greenhouse, summer pollution and winter pollution effects.