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Experimental evidence for understanding DEF sensitivity to early-age thermal history



Author(s): R.-P. Martin, C. Bazin, J. Billo, M. Estivin, J.-C. Renaud and F. Toutlemonde
Paper category: conference
Book title: Crack Control of Mass Concrete and Related Issues concerning Early-Age of Concrete Structures
Editor(s): F. Toutlemonde and J.-M. Torrenti
Print ISBN: 978-2-35158-125-4
e-ISBN: 978-2-35158-126-1
Publisher: RILEM Publications SARL
Publication year: 2012
Pages: 45 - 54
Total Pages: 10
Language: English


Abstract: Delayed Ettringite Formation (DEF) consists in an expansion of the affected concrete leading to a decrease of its mechanical properties and thus inducing problems in terms of serviceability and structural integrity. To manage the affected structures, re-assessment tools have to be provided. Such models have to include coupling laws taking into account the effects of influent parameters. Early-age temperature has a strong influence on DEF characteristics. Thus, its effects have to be finely understood. In this paper, a literature review is proposed to sum up the results available concerning this problem. Some explanations based on chemical processes are suggested. Then, the results of an experimental study that aims to quantify the couplings between thermal history and expansion characteristics are presented. Finally, coupling laws taking into account the effect of temperature are discussed. It appears that taking into account a DEF-increase rate lowered with the heat treatment duration could improve the predictions.


Online publication: 2012-07-20
Publication Type: full_text
Public price (Euros): 0.00