Investigation of carbonation rate coefficient in mortars with blast furnace slag high content

Recently, in the cement industry, admixtures are used to reduce CO2 emissions. Ground granulated blast furnace slag fine powder (GGBFS) can be used as a high replacement for cement. On the other hand, the utilization of admixtures in concrete reduces the resistance to carbonation, this is verified by calculating the carbonation rate coefficient. There are two main methods for calculating the carbonation rate coefficient, the first method is experimental calculation and the second method is formula calculation based on prediction. In this study, we investigated the possibility of the hardened cement with high replacement rate of GGBFS linked with each other. A correlation was made with the two methods as the replacement rate of GGBFS was about 50%, but there was a tendency to shift with the high replacement rate of GGBFS. The reason for the shifting tendency was because of the progress of carbonation of calcium hydroxide and C-S-H which are hydrates that has been carbonated.