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Products formed in an aged concrete the occurrence of okenite

✍ Scribed by W.F. Cole; C.J. Lancucki

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 454 KB
Volume: 13
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(83)90049-2

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✦ Synopsis

The reaction product formed within reaction rims of siltstone and sandstone aggregates in the concrete of a dam built in Australia about 30 years ago has been re-examined.

X-ray diffraction, thermal and chemical data show that the reaction product is okenite (Ca0.2Si09.2H20) and/or its precursor (4H20) in which some Ca is replaced 5y K and Na. When the concrete is wet the precursor predominates but as the concrete dries okenite (10.6 and 8.85~ phase) forms irreversibly with a different X-ray pattern to its precursor (12~ phase).

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