Durability study of a sewage sludge-cement-sand system and its environmental impact

One of the main objectives of the work is to present an effective alternative for the final destination of urban wastewater sewage sludge, by means of its inclusion in mortar or concrete. To this end, a durability study was performed on the system. The study consisted in subjecting the mortar samples to a process of accelerated carbonation and subsequently assessing the products of the carbonation by 29 Si RNM-MA nuclear magnetic resonance of solids and its environmental impact by the NEN-7345 monolithic leaching test. Carbonation at very high concentrations of CO 2 favours the polymerization of the C-S-H and the breakdown of the ettringite, which affects the leaching processes and the concentration of heavy metals and other pollutants in the leachates obtained from the NEN 7345 leaching test.