Concrete at high temperatures: hygro-thermo-mechanical degradation of concrete

Kukla, Konrad K. (2010) Concrete at high temperatures: hygro-thermo-mechanical degradation of concrete. PhD thesis, University of Glasgow.

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The main aim of the presented work is the development of a reliable and coherent solution approach to investigate thermo-hygro-mechanical behaviour of concrete, especially under severe heating conditions. The work focuses on the development and extension of an existing analytical, numerical and constitutive model developed at the University of Glasgow. This is then used as a predictive modelling tool to investigate the response of concrete structures subject to combined thermo-mechanical loads.

The thesis focuses initially on the coupled heat and mass transport model. A novel alternative formulation for sorption isotherms, that is applicable to both normal and high strength concrete, is developed. Furthermore, the effect of the slip flow effect is included and several state equations, including relative permeability and saturation vapour pressure, are adopted. Additionally, the effect of polypropylene fibres as a spalling prevention technique is modelled via a modification of the intrinsic permeability formulation. The transport model is further coupled with a damage-based mechanical model for concrete.

The fully coupled thermo-hygro-mechanical model is presented through validation and verification problems and case studies. The model is implemented in a finite element formulation and behaves in a robust manner. The predictions of moisture state for the benchmark problems of drying and heating compare well with experimental results. Classical behaviour associated with heated concrete, such as moisture clog, gas pressure build-up, etc. are all captured by the presented model. The thesis concludes by considering the analysis of prestressed concrete pressure vessel.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: high temperatures, explosive spalling, fire conditions, coupled processes, polypropylene fibres, high-strength concrete,
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Colleges/Schools: College of Science and Engineering > School of Engineering > Infrastructure and Environment
Supervisor's Name: Pearce, Dr Christopher J.
Date of Award: 2010
Depositing User: MR Konrad Kukla
Unique ID: glathesis:2010-1666
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 31 Mar 2010
Last Modified: 10 Dec 2012 13:44

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