Experimental study on quantification of carbon dioxide adsorption by different cement types and mix proportions

Efforts are underway in concrete to build a carbon dioxide-free society. The degree of CO₂ adsorption and fixation by hardened cement, concrete depend on the type of cement and water-binder ratio of the hardened cement. In this study, we analyzed various types of hardened cement by TG-DTA to determine the amount of CO₂ adsorbed and examined the possibility of quantifying the amount of CO₂ adsorbed by weight increase as a simple method. As a result, it was shown that the amount of adsorption differs depending on the type of cement, that water is necessary for CO₂ adsorption mechanism, and that the amount of adsorption can be determined simply by the weight change.