2019 Volume 73 Issue 1 Pages 363-370
This study focuses on highly reactive β-C2S and amorphous C-S-H with high CaO/SiO2 molar ratio（i.e. C/S ratio）. Previous research suggests that highly reactive β-C2S have unique mechanisms of hydration due to its extremely large specific surface area. Following these suggestions, we examined hydration properties of β-C2S with high specific surface area and atomic-leveled homogeneity. This outstanding β-C2S were synthesized from unique technique based on “Complex polymerization method”. By using this, we succeeded to obtain highly reactive β-C2S even if initial C/S is below 2.0. Furthermore, amorphous C-S-H with high C/S ratio came out as a hydration product with almost no CH when C/S is above 1.5, which suggested regeneration cycle can be applied to concrete. Under other conditions, single-phased amorphous C-S-H with high C/S ratio were generated without CH. We concluded this C-S-H was consist mainly of fully hydrated CaOH＋ ion-pairs, due to high pH value of aqueous phase.
