Abstract
The slag concrete which blast furnace slag is activated by Na2CO3 to reduce CO2 emissions has been studied. In this study, chemical compositions of hydration products in this slag paste were analyzed by the SEM-EDX method. As the results, Hydration products of slag paste were hydrotalcite, AFm phases and C-S-H. Hydrotalcite was lower Mg/Al ratio than theoretical value and formed in the inner product domain of slag grain. Chemical composition of C-S-H in the slag paste was vastly different from that in blast furnace slag cement type B（JIS A 5211, BB）paste. Ca/Si ratio of C-S-H in the slag paste was 1.1, which is much lower than that in BB paste, and large amount of Al and Na was incorporated in C-S-H. These values are consistent with that of previous papers. Na was thought to be incorporated in C-S-H because the Na/Ca ratio was increase with an increase in Si/Ca ratio.
