Performance of lightweight cement pastes under CO2 storage conditions

In this work, we intend to study the performance of cement pastes lightened with HGMS to determine whether their properties would be affected when in contact with supercritical CO2. For this purpose, it is important to assess the interaction between  HGMS and cement paste to determine its initial properties. In previous research, the chemical and mechanical interactions between these two materials were already studied, confirming their compatibility and the development of a chemical reaction between the HGMS and the cement paste. Consequently, HGMS modified the composition of cement paste, particularly the amount of calcium hydroxide and calcium silicate hydrate. In addition, in the presence of supercritical CO2, the cement paste undergoes specific changes in its chemical composition, which are also related to the dissolution of calcium hydroxide and calcium silicate hydrate. Research has already been carried out to understand the implications of this exposure, verifying the effect on the physicochemical properties of cement pastes. As carbonation progresses, variations in the physical and chemical properties of the  cement can be seen.