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Early Formation of Ettringite in Tricalcium Aluminate–Calcium Hydroxide–Gypsum Dispersions
Author(s) -
Silva Denise A.,
Monteiro Paulo J. M.
Publication year - 2007
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.1551-2916.2006.01384.x
Subject(s) - ettringite , microcrystalline , gypsum , calcium hydroxide , aluminate , materials science , chemical engineering , mineralogy , hydroxide , supersaturation , cement , chemistry , metallurgy , portland cement , crystallography , organic chemistry , engineering
The formation of hydrates in dispersions of cubic tricalcium aluminate (C 3 A)–calcium hydroxide–gypsum was observed using soft X‐ray transmission microscopy. This technique allows the continuous imaging of the hydration process without the introduction of drying artifacts. Within minutes, microcrystalline hydrates covered the C 3 A particles but over time large prismatic ettringite crystals are precipitated suppressing the microcrystalline hydrates. Within the resolution of the technique, no protective hydrated layer on the surface of C 3 A particles was observed.