Global warming arising from the release of greenhouse gasses into the atmosphere is one of the biggest issues attracting a lot of attention in recent years. Carbon Capture and Sequestration (CCS) is one of the strategies used to capture CO2 from different emission sites and inject it into suitable geological formations. It is, however, absolutely critical for CO 2 to remain confined and not allowed to leak into vital subsurface resources. One of the conventional problems faced in sequestration projects is the degradation of Portland cement due to its exposure to supercritical CO2 under reservoir pressure and temperature. This paper gives a review on the laboratory work carried out in the recent years to understand the kinetic potential of CO2-Cement reaction, and changes in the mechanical and transport properties of cement when it is in a CO2 rich environment. The results presented in different studies were not similar due to variety of approaches used in developing different types of cements. However, almost all of these studies indicated carbonation of the cement as a self-healing process whereas degradation of the cement starts with the bi-carbonation of CaCO3. It seems that adding a suitable quantity of Pozzolanic material could be useful in enhancing the resistance of cement against CO2, although more studies are still required to confirm this conclusion.

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Golam (2019) A pozzolanic supplementary material to reinforce class G cement used for drilling and completion operations.