Carbonation of sustainable Portland-free CSA-based mortars manufactured with lithium and sodium carbonates

One of the most significant problem due to the calcium sulphoaluminate cement is the poor resistance to penetration of carbon dioxide. The aim of this study is to investigate the positive influences of lithium carbonate and sodium carbonate against the carbonation of sustainable mortars without Portland cement, manufactured with cal-cium sulphoaluminate, anhydrite and supplementary cementitious materials. In order to better define the behavior of these accelerator admixtures, several rheological, elasto-mechanical and physical properties like compressive strength,free shrinkage and dy-namic modulus of elasticity, have been investigated. Experimental results show that the addition of lithium carbonate and sodium carbonate could be used to reduce the depth of carbonation without affecting the other above-mentioned properties.