Highly reactive dicalcium silicate synthesised by hydrothermal processing

The paper brings information concerning the synthesis and reactivity of a highly reactive dicalcium silicate using calcium silicate hydrates as precursors. The calcium silicate hydrates were prepared by hydrothermal treatments of mixtures consisting in CaO, amorphous SiO 2 (ROMSIL) and water, under various hydrothermal conditions. C 2S was obtained by thermal treatment – at low temperatures (700–800°C) – of these silicates hydrates. Due to this way of processing (hydrothermal synthesis and low temperature treatment), the dicalcium silicate obtained is very reactive and develops good compressive strengths in pressed mortar specimens even after one day of hardening.