Abstract
Drying of cement-based materials induces drying shrinkage, which may cause prestress loss or/and cracking if strains are (self or externally) restrained. Drying shrinkage is difficult to predict, since it depends on the material mix, mechanical and hygral boundary conditions, geometry ... This paper focuses on the study of size effect on final drying shrinkage, which is not well documented in the literature. In the Eurocode 2 (European code model), a reduction factor is applied for large structure, which is in agreement with experimental data of one campaign (found in the literature). Using numerical simulations, it is shown that a large panel of models, including phenomenological models as physical ones (which takes into account of (aging) creep under capillary pressure (assumed to be the physical mechanism for drying shrinkage)), do not predict size effect on final value of drying shrinkage.
Highlights
Drying of cement-based materials induces drying shrinkage, which may cause prestress loss or/and cracking if strains are restrained
Drying shrinkage is difficult to predict, since it depends on the material mix, mechanical and hygral boundary conditions, geometry
This paper focuses on the study of size effect on final drying shrinkage, which is not well documented in the literature
Summary
Drying of cement-based materials induces drying shrinkage, which may cause prestress loss or/and cracking if strains are (self or externally) restrained. Drying shrinkage is difficult to predict, since it depends on the material mix, mechanical and hygral boundary conditions, geometry. In the European Code model (Eurocode 2, [3]), a reduction factor is applied to minor final drying shrinkage, which ranges from 1 to 0.7, depending on the notional size of the structural member. In order to predict drying shrinkage, it is important to dispose of a relevant predictive model (based on chemo-physical mechanisms). The comparison with others approaches as well as 2 classical drying shrinkage models are performed
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