Impact de conditions de cycles d'humidification/séchage sur la formation différée d'ettringite dans les bétons

Title: Impact de conditions de cycles d'humidification/séchage sur la formation différée d'ettringite dans les bétons
Author(s): A. Pavoine, L. Divet, S. Fenouillet, V. Randazzo, J.-P. Davy
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 36
Issue: 263
Issue date: 2003-11-01
Publication year: 2003
Pages: 587 - 593
Total Pages: 7
Nb references: 14
Language: French

Abstract: The Delayed Ettringite Formation (DEF) is an endogenous reaction which can sometimes be at the origin of concrete structure degradation.
Until now, no selective predictive tool is available with respect to this pathology.
This paper deals with some preliminary results of a study aimed at developing a predictive test based on drying and wetting cycles.
Samples were heat cured at 80°C for 10 hours or maintained at 20°C.
They were first subjected to drying (38°C or 60°C)/wetting cycles and then definitively immerged in water at 20°C.
The follow-up of longitudinal dimensions as well as SEM examinations allowed: to note the loss of selectivity of the test when drying is carried out at 60°C, to detect in shorter time, potentially reactive concretes or not with respect to a DEF expansion, when drying is carried out at 38°C.
A test based on cycles whose drying is carried out at 38°C, applied to concretes can thus be considered.
Complementary studies are still needed to optimize and validate this test.

Online publication: 2003-09-27
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13865