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Title: A creep-damage model for mesoscale simulations of concrete expansion-degradation phenomena

Abstract

Long-term performance of aging concrete in nuclear power plants (NPPs) requires a careful examination of the physical phenomena taking place in the material. Concrete under high neutron irradiation is subjected to large irreversible deformations as well as mechanical damage, caused by a swelling of the aggregates. However, these results, generally obtained in accelerated conditions in test reactors, cannot be directly applied to NPP irradiated structures, i.e., the biological shield, operating conditions due to difference in time scale and environmental conditions (temperature, humidity). Mesoscale numerical simulations are performed to separate the underlying mechanisms and their interactions. The cement paste creep-damage model accounts for the effect of the loading rate on the apparent damage properties of the material and uses an event-based approach to capture the competition between creep and damage. The model is applied to the simulation of irradiation experiments from the literature and shows a good agreement with the experimental data.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1222552
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: CONCREEP-10, Vienna, Austria, 20150921, 20150923
Country of Publication:
United States
Language:
English
Subject:
Concrete; Irradiation; Modeling

Citation Formats

Giorla, Alain B, and Le Pape, Yann. A creep-damage model for mesoscale simulations of concrete expansion-degradation phenomena. United States: N. p., 2015. Web.
Giorla, Alain B, & Le Pape, Yann. A creep-damage model for mesoscale simulations of concrete expansion-degradation phenomena. United States.
Giorla, Alain B, and Le Pape, Yann. Thu . "A creep-damage model for mesoscale simulations of concrete expansion-degradation phenomena". United States. doi:.
@article{osti_1222552,
title = {A creep-damage model for mesoscale simulations of concrete expansion-degradation phenomena},
author = {Giorla, Alain B and Le Pape, Yann},
abstractNote = {Long-term performance of aging concrete in nuclear power plants (NPPs) requires a careful examination of the physical phenomena taking place in the material. Concrete under high neutron irradiation is subjected to large irreversible deformations as well as mechanical damage, caused by a swelling of the aggregates. However, these results, generally obtained in accelerated conditions in test reactors, cannot be directly applied to NPP irradiated structures, i.e., the biological shield, operating conditions due to difference in time scale and environmental conditions (temperature, humidity). Mesoscale numerical simulations are performed to separate the underlying mechanisms and their interactions. The cement paste creep-damage model accounts for the effect of the loading rate on the apparent damage properties of the material and uses an event-based approach to capture the competition between creep and damage. The model is applied to the simulation of irradiation experiments from the literature and shows a good agreement with the experimental data.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}

Conference:
Other availability
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