Premium
Hydration of Beta Dicalcium Silicate Alone and in the Presence of CaCl 2 or C 2 H 5 OH
Author(s) -
COLLEPARDI MARIO,
MASSIDDA LUIGI
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12450.x
Subject(s) - hydrate , chemistry , calcium silicate hydrate , silicate , mineralogy , phase (matter) , water of crystallization , inorganic chemistry , molar ratio , calcium silicate , analytical chemistry (journal) , chemical engineering , materials science , cement , organic chemistry , metallurgy , catalysis , engineering
Beta C 2 S was hydrated at room temperature with and without added CaCl 2 or C 2 H 5 OH by methods previously studied for the hydration of C 3 S, i.e. paste, bottle, and ball‐mill hydration. The amount of reacted β‐C 2 S, the Ca(OH) 2 concentration in the liquid phase, the CaO/SiO 2 molar ratio, and the specific surface area of the hydrate were investigated. A topochemical reaction occurs between water and β‐C 2 S, resulting in the appearance of solid Ca(OH) 2 and a hydrated silicate with a CaO/SiO 2 molar ratio of ≃1. As the liquid phase becomes richer in Ca(OH) 2 , the first hydrate transforms to one with a higher CaO/SiO 2 ratio. Addition of CaCl 2 increases the reaction rate and the surface area of the hydrate but to a much lesser extent than in the hydration of C 3 S, whereas C 2 H 6 OH strongly depresses the hydration rate of β‐C 2 S, as observed for C 3 S hydration.