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Hydration in the System Ca 2 SiO 4 –Ca 3 (PO 4 ) 2 at 90°C
Author(s) -
Barnes Mary W.,
Klimkiewicz Maria,
Brown Paul W.
Publication year - 1992
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.1151-2916.1992.tb04204.x
Subject(s) - portlandite , tobermorite , calcium silicate hydrate , calcium silicate , hydrate , silicate , chemistry , mineralogy , lime , phase (matter) , calcium , soda lime , inorganic chemistry , analytical chemistry (journal) , materials science , portland cement , cement , metallurgy , chromatography , organic chemistry , composite material
Compositions along the Ca 2 SiO 4 –Ca 3 (PO 4 ) 2 join were hydrated at 90°C. Mixtures containing 15, 38, 50, 80, and 100 mol% Ca 3 (PO 4 ) 2 were fired at 1500°C, forming nagelschmidtite + a 1 ‐CaSiO 4 , A ‐phase and silicocarnotite and a ‐Ca 3 (PO 4 ) 2 , respectively. Hydration of these produces hydroxylapatite regardless of composition. Calcium silicate hydrate gel is produced when Ca 2 SiO 4 ≠ 0 and portlandite when Ca 2 SiO 4 is >50%. Relative hydration reactivities are a ‐Ca 3 (PO 4 ) 2 > nagelschmidtite > α 1 ‐Ca 2 SiO 4 > A ‐phase > silicocarnotite. Hydration in the presence of silica or lime influences the amount of portlandite produced. Hydration in NaOH solution produces 14‐A tobermorite rather than calcium silicate hydrate gel.