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Rapid Hardening of Cement by the Addition of a Mechanically Activated Al(OH) 3 –Ca(OH) 2 Mixture
Author(s) -
Kitamura Makoto,
Kamitani Masataka,
Senna Mamoru
Publication year - 2000
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.1151-2916.2000.tb01228.x
Subject(s) - cement , hardening (computing) , dissolution , aqueous solution , materials science , compressive strength , aluminate , chemical engineering , ionic strength , nuclear chemistry , chemistry , composite material , organic chemistry , layer (electronics) , engineering
Rapid hardening of cement was achieved in the present study by adding a mechanically activated Al(OH) 3 –Ca(OH) 2 mixture to the starting cement paste. Among the dominant parameters for hardening were the mechanical treatment time for the Al(OH) 3 powder and the Al(OH) 3 /Ca(OH) 2 ratio. The hardening mechanisms are discussed here in terms of the ionic concentration of the solution and the hydration products created when the Al(OH) 3 –Ca(OH) 2 mixture was added to water. Mechanical activation of the Al(OH) 3 powder accelerated dissolution into an aqueous alkaline solution and induced the formation of calcium aluminate hydration products. Those hydration products increased the compressive strength of the cement paste at a very early stage of hardening.