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Substituted Hydrated Calcium Silicates Obtained in Autoclave Hydration
Author(s) -
CHIOCCHIO GERARDO,
COLLEPARDI MARIO,
TURRIZIANI RENATO
Publication year - 1975
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.1151-2916.1975.tb11439.x
Subject(s) - ettringite , autoclave , aqueous solution , sulfate , solid solution , cement , calcium , mineralogy , materials science , crystal structure , chemistry , chemical engineering , inorganic chemistry , nuclear chemistry , metallurgy , crystallography , portland cement , engineering
Hydrated calcium silicates containing Al 3+] or Fe 3+] were prepared by autoclaving C 3 S and β‐C 2 S in the presence of C 3 A or C 2 F at 190°C. Al 3+] and Fe 3+] diffuse into the crystal lattice of α‐C 2 SH and C 3 SH 1.5 . Solid solutions containing Al 3+] and Fe 3+] were placed in contact at 25°C with sources of sulfates, either in aqueous stirred suspensions or as pastes. Al 3+] and Fe 3+] remain stable in the solid solution, inhibiting the formation of ettringite. This absence of ettringite can explain the resistance of autoclaved cement pastes and concretes to sulfate attack.