Journal Published Online: 03 March 2022
Volume 11, Issue 1

A Novel Test Method for the Determination of Delayed Ettringite Formation in Mass Concrete

CODEN: ACEMF9

Abstract

Delayed ettringite formation in concrete structures can develop long after they are placed into service; this deleterious reaction is particularly difficult to predict because of the extended time before becoming symptomatic. However, once discovered, it is known to impact durability and drastically reduce service life. This research presents a novel test method developed for mortars to represent concretes that experience high early-age temperature profiles to determine the potential for delayed ettringite formation in mass concrete. To more accurately replicate exposure conditions of typical mass concrete placements, this novel method exposes specimens to a rapid heat acceleration and soaking period at 95 °C and 95 % relative humidity for an extended period of time followed by storage in a calcium hydroxide solution at room temperature. This results in a reduction of the dormancy period before onset of delayed ettringite formation while minimizing laboratory resources. A further benefit of the test is the reduction of the induction period typically associated with delayed ettringite formation. The method has proved to be valuable, as it allows for the rapid determination the potential of supplementary cementitious materials to mitigate delayed ettringite formation.

Author Information

Paris, Jerry M.
Engineering School of Sustainable Infrastructure and the Environment, University of Florida, Gainesville, FL, USA
Ferraro, Christopher C.
Engineering School of Sustainable Infrastructure and the Environment, University of Florida, Gainesville, FL, USA
Kennedy, Danielle E.
Engineer Research and Development Center, Cold Regions Research and Engineering Laboratory, US Army Corps of Engineers, Hanover, NH, USA
Bentivenga, Anthony
Durability Engineers, Chicago, IL, USA
Scott, D. B.
Electric Power Research Institute, Palo Alto, CA, USA
Pages: 13
Price: $25.00
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Details
Stock #: ACEM20210071
ISSN: 2379-1357
DOI: 10.1520/ACEM20210071