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Calcium Hydroxide Crystal Evolution upon Aging of Lime Putty
Author(s) -
RodriguezNavarro Carlos,
Hansen Eric,
Ginell William S.
Publication year - 1998
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.1151-2916.1998.tb02735.x
Subject(s) - portlandite , lime , nucleation , materials science , chemical engineering , mineralogy , calcium hydroxide , brucite , calcite , crystal (programming language) , composite material , chemistry , cement , metallurgy , portland cement , organic chemistry , magnesium , engineering , computer science , programming language
Aging of lime putty, by storing slaked lime under excess water for extended periods of time, has been recognized for centuries as a means to improve the quality of hydrated lime as a binder in lime‐based mortar and plasters. However, there is limited, and at times contradictory, evidence about the effect of the extended exposure of portlandite (Ca(OH) 2 ) to water. Our data from X‐ray diffraction, nitrogen adsorption, and scanning electron microscopy studies indicate that portlandite crystals undergo both an important size reduction and a significant morphological change, developing submicrometer, platelike crystals upon aging. A model for portlandite evolution is proposed and discussed, based upon (a) differences in solubility between {0001} basal pinacoid faces, and {1010} prism faces, and (b) heterogeneous secondary nucleation of nanometer‐scale platelike portlandite crystals.