Unconfined compression tests of cement-treated soil with carbon dioxide containment

Carbon capture and storage (CCS) technology has been actively developed in recent years, primarily in the concrete sector, through carbonation curing and use of CO2-fixed materials. In the cement-based ground improvement sector, if the volume of cement-treated soil can be used to fix carbon dioxide in the ground, this would contribute to recent societal initiatives for carbon neutrality. In this study, the strength development characteristics of cement-treated soils mixed with carbon dioxide were investigated. Unconfined compression tests on cement-treated soil showed that a certain level of strength development was possible up to a carbon dioxide/cement ratio of approximately 10% over 224 days. The sequestration characteristics of carbon dioxide in cement-treated soils were investigated in this study. The carbon content of the cement-treated soil increased by almost the same amount as the carbon content derived from the mixed carbon dioxide compared to that of the cement-treated soil without carbon dioxide containment, indicating that carbon dioxide was sequestered in the cement-treated soil.