Abstract
Many studies have shown the effect of different parameters on the expansion induced by delayed ettringite formation (DEF), but there is not yet a general agreement on their relative effects due to discrepancies on experimental results generally attributed to different experimental conditions. The aim of this study is to assess the coupling effects between some of the main parameters of this reaction using the experimental design method. The main interactions concern two factors: temperature and duration of heating during curing. Each interaction has been subjected to statistical tests in order to be validated. The resulting empirical models can reflect the experimental fields and therefore provide useful information about the risk of expansion related to␣DEF, knowing the temperature and the duration of curing, the alkali content of the concrete, the aggregate nature and the water to cement ratio.
Résumé
De nombreuses études ont montré l’influence de différents paramètres sur les expansions induites par la formation différée de l’ettringite (DEF). En raison des divergences de résultats attribuées à des conditions expérimentales différentes, il n’existe pas d’accord unanime sur l’effet de ces paramètres. L’objectif de cette étude consiste à étudier les couplages entre certains des principaux paramètres de cette réaction par la méthode des plans d’expériences. Les principales interactions concernent la température et la durée de l’échauffement. Chaque interaction a subi un test statistique afin d’être validée. Les modèles empiriques déterminés peuvent reproduire le champ expérimental étudié et ainsi fournir des informations pertinentes sur les risques d’expansion attribuée à la DEF, à partir de la connaissance de la température et de la durée de l’échauffement, la teneur en alcalins du béton, la nature des granulats et le rapport E/C.
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Acknowledgements
The authors would like to thank the technical association of the French hydraulic binder industry (ATILH) and the study and research center for the French concrete industry (CERIB) for their technical and financial supports.
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Brunetaud, X., Linder, R., Divet, L. et al. Effect of curing conditions and concrete mix design on the expansion generated by delayed ettringite formation. Mater Struct 40, 567–578 (2007). https://doi.org/10.1617/s11527-006-9163-3
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DOI: https://doi.org/10.1617/s11527-006-9163-3