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An elastoplastic damage constitutive model of concrete considering the effects of dehydration and pore pressure at high temperatures

Authors
  • Yao, Yao1, 2
  • Guo, Hongcun2
  • Tan, Kanghai3
  • 1 Xi’an University of Architecture and Technology, Xi’an, 710055, China , Xi’an (China)
  • 2 Northwestern Polytechnical University, Xi’an, 710072, China , Xi’an (China)
  • 3 Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore , Singapore (Singapore)
Type
Published Article
Journal
Materials and Structures
Publisher
Springer - RILEM Publishing
Publication Date
Feb 11, 2020
Volume
53
Issue
1
Identifiers
DOI: 10.1617/s11527-020-1450-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

Pore pressure and thermal dehydration of concrete are two major factors which affect the spalling of concrete at high temperatures. Thermal dehydration can cause deterioration of concrete properties and promote the development of micro cracks in the skeleton of concrete. Pore pressure will also be influenced by dehydration when the hydrated water enters the micro pores. In the current study, a framework of elastoplastic damage constitutive model is developed to described the mechanical behaviour of concrete and pore pressure at high temperatures. Both load induced damage and thermal dehydrated damage are considered. The thermal dehydrated damage is temperature related, which reflects the impact of temperature on concrete properties. A model of pore pressure is developed by considering the influence of thermal dehydration and damage related permeability. The pore pressure field associated with vapor, liquid water and dry air is predicted and compared with experimental results.

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