Delayed Ettringite Formation: Many Questions and Some Answers


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Title: Delayed Ettringite Formation: Many Questions and Some Answers

Author(s): W. G. Hime and S. L. Marusin

Publication: Special Publication

Volume: 177


Appears on pages(s): 199-206

Keywords: alkali-silica reaction; clinker; electron microscopes; ettringite; steam curing; sulfate; sulfate attack

Date: 1/1/1999

During the past few years delayed ettringite formation (DEF) has probably received more attention, and been involved in more controversy, than any other concrete deterioration mechanism. Even its name has been subject to dispute. Our extensive experience on the investigation of many occurrences of DEF is presented here as a series of questions, with some answers. Where answers have become available, they have explained phenomena that have greatly bothered us and other investigators. Where answers are not available, the questions will provide directions for needed research.