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Title: Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Prestress losses due to creep of concrete is a matter of interest for long-term operations of nuclear power plants containment buildings. Experimental studies by Granger (1995) have shown that concretes with similar formulations have different creep behaviors. The aim of this paper is to numerically investigate the effect of size distribution and shape of elastic inclusions on the long-term creep of concrete. Several microstructures with prescribed size distribution and spherical or polyhedral shape of inclusions are generated. By using the 3D numerical homogenization procedure for viscoelastic microstructures proposed by Šmilauer and Bažant (2010), it is shown that the size distribution and shape of inclusions have no measurable influence on the overall creep behavior. Moreover, a mean-field estimate provides close predictions. An Interfacial Transition Zone was introduced according to the model of Nadeau (2003). It is shown that this feature of concrete's microstructure can explain differences between creep behaviors.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2]
  1. Université Paris-Est, Laboratoire Navier (ENPC, IFSTTAR, CNRS), 77455 Marne-la-Vallée Cedex (France)
  2. Département Mécanique des Matériaux et des Composants, EDF R&D, Site des Renardières, Avenue des Renardières, 77818 Moret-Sur-Loing Cedex (France)
Publication Date:
OSTI Identifier:
22475501
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 71; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPUTERIZED SIMULATION; CONCRETES; CREEP; ELASTICITY; INCLUSIONS; MEAN-FIELD THEORY; MICROSTRUCTURE; MORPHOLOGY; PARTICLE SIZE; REACTOR MATERIALS; SPHERICAL CONFIGURATION; VISCOSITY