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Modelling Basic Creep of Concrete at Elevated Temperatures and Stresses

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Abstract:

The prestressed concrete confinement vessel is the third and last barrier in Nuclear Power Plants (NPP). In case of a severe accident (loss of cooling agent of the reactor for instance), pressure and temperature will increase in the nuclear vessel (0,5 MPa and 180°C during 2 weeks). Due to elevated temperatures, the evolution of basic creep will be accelerated. In this case, due to internal pressure, some tensile stresses could appear in specific parts of the structure and induce cracking. The modelling of basic creep and its couplings with temperature is very important for the safety of the structure (tightness of the concrete vessel). Here we present a model considering the following elements: a coupling between creep and damage is introduced, kinetics of basic creep is affected by temperature by the means of an Arrhenius thermo-activation, damage due to the increase of temperature is taken into account. The model is compared with the available experimental results. This work is a part of the MACENA project.

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Periodical:

Key Engineering Materials (Volume 711)

Pages:

879-884

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.711.879

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Online since:

September 2016

Authors:

Jean Michel Torrenti*

Keywords:

Basic Creep, Concrete, Coupling, Damage, Temperature, Tertiary Creep

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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