Experimental study of DEF expansions of concrete mixes submitted to early and late heat treatments
MARTIN ; BAZIN ; RENAUD ; TOUTLEMONDE
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
MARTIN ; BAZIN ; RENAUD ; TOUTLEMONDE
Résumé / Abstract
Delayed Ettringite Formation (DEF) is an endogenous reaction leading to the expansion of the affected concretes and generally inducing cracking and decrease of the mechanical properties. Consequently, the corresponding structures have to be re-assessed in terms of serviceability and structural safety. Numerical tools are generally used for these purposes. Their development requires however a good understanding of the corresponding mechanisms. In particular, the effects of heating have to be well taken into account since this parameter is one of the most influent regarding DEF. This paper proposes an experimental study concerning the effects of early and late heat treatments on the expansions due to DEF. Concrete cylinders had been exposed to multiple heatings of various temperatures and durations. They have been monitored in terms of expansions and mass during about 1800 days. The swellings have been quantified by modelling the expansions. The results have been analyzed regarding the thermal history of the specimens and the degradation they suffered prior to the heat treatment.
