Paper Title:
Thermoviscoelastic Analysis of Concrete Creep at Mesoscale
  Abstract

Concrete is a heterogeneous material made up at mesoscale of linear elastic aggregates distributed in a mortar matrix whose behavior is time and temperature dependent. The Interfacial Transition Zone (ITZ) between aggregates and matrix also influences the overall behavior. We investigate here analytically and numerically by means of 3D simulations the creep behavior of concrete and mortar subjected to moderate temperatures at mesoscale. The numerical specimens consist in unstructured periodic meshes of polyhedral aggregates with various size and shapes randomly distributed in a box. Specific interface finite elements are introduced between aggregates and matrix to model the ITZ. Both matrix and ITZ are considered as linear thermoviscoelastic materials. Averaged stresses and strains in the matrix and aggregate phases are compared to analytical estimations obtained with classical mean-field approximation schemes applied in the Laplace-Carson space, where the ITZ are introduced via imperfect interfaces modelled with the Linear Spring Model (LSM). The effects of ITZ thickness, aggregate shape and temperature are then studied to evaluate their respective influence on mortar and concrete creep behavior.

  Info
Periodical
Chapter
Chapter 6: New Design Concepts and Methods for Long-Term Performance, Robustness with Respect to Loading Hazards and Sustainability of Concrete Structures
Edited by
Matteo Colombo, Marco di Prisco
Pages
652-658
DOI
10.4028/www.scientific.net/KEM.711.652
Citation
B. Bary, C. Bourcier, T. Helfer, "Thermoviscoelastic Analysis of Concrete Creep at Mesoscale", Key Engineering Materials, Vol. 711, pp. 652-658, 2016
Online since
September 2016
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Price
$35.00
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