SOME EXAMPLES ON SHRINKAGE RESTRAINT EFFECTS ON CONCRETE AND CONCRETE STRUCTURES

Author(s):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:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 76-85
Total Pages: 9
Language : English

Abstract: Although concrete is the most widely-used materials in construction in the world, its delayed
behavior (shrinkage and creep) is still poorly understood. Shrinkage has negative impacts on
concrete structures: cracking, prestress loss etc. Shrinkage (autogeneous, drying and thermal)
restraint occurs at different scales. At the mesoscopic scale, shrinkage of cement paste is
restrained by aggregates: debonding at cement paste/aggregate interface and inter-granular
cracks may occur. At the macroscopic scale, gradients of temperature and relative humidity,
restraint by adjacent elements (previously cast slabs, concrete lift etc.) and by reinforcement
may induce also debonding and cracking. Effects are various. A decrease of stiffness and load
bearing capacity occurs. Penetration of aggressive species (carbonation, chloride etc.) is
promoted due to the increase of transport properties (permeation and diffusivity). Finally, if a
tightness is required and ensured only by concrete (nuclear reactor containment, tunnel lining,
dams, wastewater treatment plant, etc.), it can be compromised. Some examples will be
presented through experiments and numerical simulations, and will concern early-age and
long term behavior, at different scales. A focus will be addressed on some issues still
unresolved.

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