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Pro109-1

CONCRETE DRYING: EFFECTS OF BOUNDARY CONDITIONS AND SPECIMEN SHAPE



Author(s): Jérôme Carette, Farid Benboudjema, Georges Nahas, Kamilia Abahri, Aveline Darquennes, Rachid Bennacer
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 402-411
Total Pages: 10
Language : English


Abstract: In the framework of the ODOBA project, representative structures in reinforced concrete are
submitted to various types of durability distress, in order to have elements of knowledge on
pathologies which could develop in the course of time. Among studied issues are the alkali-
aggregate reaction (AAR) and the delayed ettringite formation (DEF), which appear after a
large induction period, but develop then quickly, inducing irreversible structure damage.
These issues are closely related to the water distribution and to the surrounding humidity.
Controlling the processes of drying and wetting of concrete is of major importance in this
regard. However, the mechanisms at their origin are currently not well established and
modelled. This work is a preliminary study aiming at identifying the main mechanisms in
play during drying-wetting cycles through a coupled experimental-numerical study of the
humidity gradient inside concrete. In this paper, the drying of various concrete samples is
cautiously studied through refined measurement of the mass loss and internal relative
humidity distribution. Various sample sizes and shapes are tested. A simulation strategy is
described, including the modelling of water vapour diffusion and liquid water permeation.
The introduction of a boundary layer at the drying interface improves the mass variation
prediction.


Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00


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