SIZE EFFECT ON THE DRYING SHRINKAGE

Author(s): Aveline Darquennes, Mariana Vasylchenko, Farid Benboudjema
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:978-2-35158-171-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 725-733
Total Pages: 9
Language : English

Abstract: When restrained, delayed deformations as the thermal, drying and autogenous shrinkages, can
cause cracks in concrete structures and therefore limit their serviceability and life time. It is
therefore important to correctly predict their kinetics and amplitude. For the case of massive
structures, the size of the concrete structural elements and their thermal history seems to affect
the evolution of the delayed deformations. Eurocode 2 for example introduces parameters to
take into account the size effect in term of kinetics and final amplitude (which is quite
questionable). In the present work, the size effect on drying shrinkage is studied on prismatic
mortar samples to accelerate the drying process. The specimens are characterized by different
average drying radius. The drying begins after a curing duration equal to 28 days to limit the
effect of hydration and autogenous shrinkage on the total deformation. To separate the size
and thermal history effects, some mortar samples have undergone a thermal curing similar to
the thermal evolution inside a massive structure. Based on the experimental results, it appears
that size effect is observed on the kinetics of drying shrinkage and that the diffusion laws are
respected.

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