Numerical model for mechanical behavior of lightweight concrete and for the prediction of local stress concentration

•A numerical model of lightweight concrete which respect a granular model.•Influence of Young’s modulus contrast in mechanical behavior of lightweight concretes.•Tensile and compressive stresses around lightweight aggregates identified.•Hypothesis of rupture only in mortar for lightweight concretes...

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Vydáno v:Construction & building materials Ročník 59; s. 180 - 187
Hlavní autoři: Malachanne, Etienne, Sassine, Rita, Garcia-Diaz, Eric, Dubois, Frederic
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 30.05.2014
Elsevier B.V
Elsevier
Témata:
Analysis
Compressive strength prediction
Concrete
Engineering Sciences
Finite element method
Lightweight concrete
Mechanical properties
Microstructure
Numerical modelization
Properties
France
Lightweight concrete
Numerical modelization
Compressive strength prediction
ISSN:0950-0618, 1879-0526
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Shrnutí:•A numerical model of lightweight concrete which respect a granular model.•Influence of Young’s modulus contrast in mechanical behavior of lightweight concretes.•Tensile and compressive stresses around lightweight aggregates identified.•Hypothesis of rupture only in mortar for lightweight concretes studied. In this study a numerical approach to simulate elastic behavior of lightweight concrete, is presented, at mesoscopic level. Concrete is considered as a bi-phasic material, composed of a granular skeleton dispersed in a mortar. Aggregates generation should respect a granular model where a maximum distance between aggregates is imposed. The granular media is also defined by a granular curve and a compacity. A numerical concrete sample is carried out, using three-dimensional finite element mesh. Here lightweight concretes are considered, where Young’s modulus of natural sand based mortar is higher than the modulus of the lightweight coarse aggregates. Different concretes are carried out, according to experimental studies from literature, in order to distinguish the influence of Young’s modulus contrast, and of the concrete compacity, on mechanical behavior. Then numerical compressive tests are realized until an experimental value of compressive strength, and the local stress and strain distribution around aggregates is studied, still remaining in the elastic domain. According to these results, breaking of this kind of concrete occurs when the maximum strain is reached in the lightweight aggregates surrounded mortar.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2014.01.067