Crystal Growth In Entrained-Air Voids

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Title: Crystal Growth In Entrained-Air Voids

Author(s): Bryant Mather

Publication: Special Publication

Volume: 223

Issue:

Appears on pages(s): 105-106

Keywords:

Date: 10/1/2004

Abstract:
Crystals are found in some entrained-air voids of all concrete that has been "left out in the rain" or stored while damp. These crystals can be observed through petrographic examination of thin or ground concrete sections at normal magnification. If the concrete was made using a cement with a high tricalcium aluminate (C3A) content (over 8%), it is likely that areas in it will be covered with ettringite crystals - secondary ettringite.