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As global warming became a worldwide issue, a significant effort has been made on the development of technology related to CO2 capture and storage. Geologic sequestration of CO2 is one of those technologies for safe disposal of CO2. Geologic sequestration stores CO2 in the form of supercritical fluid into the underground site surrounded by solid rock, and concrete is used for prevention of CO2 leakage into the atmosphere. In such case, concrete may experience severe damage by attack of supercritical CO2, and especially in contact with underground water, very aggressive form of carbonation can occur. In this work, to prevent such deterioration in concrete, calcium phosphates were added to the portland cement to produce hydroxyapatite, one of the most stable mineral in the world. Temperature rise, viscosity, set and stiffening, and strength development of cement paste incorporating three different types of calcium phosphates were investigated. According to the results, it was found that the addition of calcium phosphate increased apparent viscosity, but decreased maximum temperature rise and 28 day compressive strength. It was found that monocalcium phosphate was found to be inappropriate for portland cement based material. Applicability of dicalcium and tricalcium phosphates for portland cement needs to be evaluated with further investigation, including the long term compressive strength development.

Evaluation on the Basic Properties of Phosphate Modified Portland Cement Paste for Potential Application of Geologic CO2 Sequestration