The endothermic peak located at 733–739Cis
due to the decomposition of calcium carbonate. Obviously,
the weight loss of GBFS-NC14 (B) paste is greater than those
of GBFS-NC12 (A) and GBFS-NC16 (C) pastes, respectively.
This is due to that the amount of CSH formed in GBFS-NC14
(B) paste is greater than those of GBFS-NC12 (A) and GBFSNC16 (C). On the other hand, the intensity of the endotherm
characteristic for calcium carbonate in case of GBFS-NC12 (A) is higher than those of GBFS-NC14 (B) and GBFSNC16 (C). This result is mainly related to the value of CC
/
SH ratio of the activator; this ratio decreases in order
NC12 > NC14 > NC16.