Hydration and Hardening of CaO-MgO-SiO₂ Cement as Biomaterial

Abstract

The hydration and hardening characteristic of materials in the system CaO-MgO-SiO₂ have been investigated by XRD, SEM, FT-IR and calorimetry. 2CaO⋅MgO⋅2SiO₂ glass hydrated and calcium silicate hydrate gels (C-S-H) were formed after 90min of curing. Diopside did not hydrate. The compressive strength of the hardened cement (at 37°C for 6h) was 27MPa. The setting time for the crystalline sample in ammonium phosphate solution was 4-6min and that for the glass sample was less than 3min. It is expected that CaO-MgO-SiO₂ cement is useful as a biomaterial.