Effect of sequestration of carbon dioxide on technological properties of cement-slurries and its impact on environmental safety of geological storage

Reducing CO2 emissions is one of the most important issues, not only from the economic point of view, but first and foremost because of its importance for environmental protection. Worldwide research on reduction of CO2 emissions aim to develop technology for carbon capture and storage without a negative impact on the environment. Geologic sequestration of carbon dioxide is the storage method, which is currently tested in various CCS research programs. However, this type of CO2 storage has to be environmentally safe and already at the stage of planning there is a need to estimate the probability of leakage. This applies to both the geological structure, where CO2 is stored, as well as to the infrastructure, and resulting use of materials, primarily cement. For this reason, there are ongoing research projects which aim to determine the cements resistant to corrosive action of CO2. What is more, the impact of carbon dioxide on technological properties of cement which can cause technological complications and leaks should be investigated. This article presents the results of the research on the influence of CO2 on the basic properties of cement slurries that can be potentially useful in drilling technologies used for geological storage. The research has determined the fluidity and initial and final setting time of cement, the amount of supernatant water and mechanical properties (bending strength and compressive strength)