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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Expansion Due to DEF in Normally-Cured Concrete Heated by Cement Hydration
Author(s): N. Petrov, M. Thibault, and A. Tagnit-Hamou
Publication: Special Publication
Appears on pages(s): 239-250
Keywords: concrete; DEF; deterioration; ettringite; expansion; field concrete; heat of hydration; self-heating; steam curing; sulfate attack
Abstract:The expansion of laboratory heat-cured mortar and concrete specimens caused by delayed ettringite formation (DEF) is often the object of scientific investigation. However, cases of this expansion in normally-cured concrete are rarely reported in the literature. The results presented in this paper show that concretes made with a relatively moderate cement content of 300 kg/m3 can develop a temperature as high as 72 °C at the centre of massive elements, and that in such a case, it can be vulnerable to DEF and subsequent expansion. Four concrete mixtures made with different commercial cements having a W/C of 0.55, were used for casting cubic concrete samples measuring 0.2 m3. The temperature of fresh concrete was 30 °C. The maximum temperature developed at the centre of the samples varied between 64 and 72 °C. After 400 days of storage in lime-saturated water, two samples showed a significant expansion. One sample was severely cracked. This experiment shows that DEF-related expansion is not possible only in steam-cured precast concrete members, but that cast in-place massive concrete structures in hot climatic conditions can also be sensitive to DEF.
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