Abstract

Current test methods for evaluating the potential for delayed ettringite formation (DEF) are quite time consuming. It is common for these tests to take over one year to complete due to the fact that there are no minimum expansion criteria at a prescribed number of days. A novel numerical extrapolation technique is presented that can predict the final expansion of the specimen after expansion starts. The accuracy of the method is shown for 30 tests from laboratory and field concrete with expansion from DEF. The technique was able to accurately predict the ultimate expansion within 0.18 % and shorten the test by over 80 %. This time savings would be especially useful for owners who need to evaluate the potential for DEF expansion for an existing structure.

Issue Section:
Research Papers
Keywords:
delayed ettringite formation, durability, accelerated testing

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