A note on the occurrence of crystals of calcium hydroxide and ettringite in voids in hardened Portland cement paste

From National Research Council Canada

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DOI	Resolve DOI: https://doi.org/10.1680/macr.1965.17.50.3
Author	Search for: Gillott, J. E.¹; Search for: Ritchie, T.¹
Affiliation	National Research Council of Canada
Format	Text, Article
Subject	Concrete; Portland cement; calcium; hydroxides; crystalline state; carbonation
Abstract	The occurrence of crystals of calcium hydroxide and ettringite (calcium sulphoaluminate) in hardened Portland cement, reported previously by others, is confirmed. Samples of hardened Portland cement paste prepared half a century ago at one of Canada's earliest cement plants were, on examination, found to contain voids in which well developed crystals had formed. The crystals occurred as thin plates and needles that were identified by optical microscopy and X-ray diffraction as calcium hydroxide and ettringite, respectively. It is of interest that the calcium hydroxide had not been altered to carbonate even though the cement samples had been stored for a long time under conditions that would be expected to promote this change.
Publication date	1965-07-01
In	Magazine of Concrete Research 17, no. 50 (1 July 1965): 3–4.
Language	English
Peer reviewed	No
Identifier	DBR-RP-264
NRC number	NRCC 8586 NRC-IRC-2150
NPARC number	20374910
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Record identifier	0a138690-b433-4175-9787-12941238d144
Record created	2012-07-23
Record modified	2023-01-26

Date modified:: 2024-04-18