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Influence of the thermophysical properties of pavement materials on the evolution of temperature depth profiles in different climatic regions

Hall, Matthew R.; Dehdezi, Pejman Keikhaei; Dawson, Andrew R.; Grenfell, James; Isola, Riccardo

Authors

Matthew R. Hall

Pejman Keikhaei Dehdezi

Andrew R. Dawson

James Grenfell

Riccardo Isola

Abstract

The paper summarizes the relative influence of different pavement thermo-physical properties on the thermal response of pavement cross-sections, and how their relative behaviour changes in different climatic regions. A simplified one-dimensional heat flow modelling tool was developed to achieve this using a finite difference solution method for studying the dynamic temperature profile within pavement constructions. This approach allows for a wide variety and daily varying climatic conditions to be applied, where limited or historic thermo-physical material properties are available, and permits the thermal behaviour of the pavement layers to be accurately modelled and modified. The model was used with available thermal pavement materials properties and with properties determined specifically for the study reported here. The pavement materials included in the study comprised both conventional bituminous and cementicious mixes as well as unconventional mixtures that allowed a wide range of densities, thermal conductivities, specific heat capacities and thermal diffusivities to be investigated. Initially, the model was validated against in-situ pavement data collected in the USA in five widely differing climatic regions. It was found to give results at least as good as others available from more computationally expensive approaches such as 2D and 3D FE commercial packages. Then the model was used to compute the response for the same locations had the thermal properties been changed by using some of the unconventional pavement materials been used. This revealed that reduction of temperature range by several degrees was easily possible (with implications for reduction of rutting, fatigue and the Urban Heat Island effect) and that depth of penetration of peak temperatures was also achievable (with implications for winter freeze-thaw). However, the results showed that there was little opportunity to displace the peak temperatures in time.

Journal Article Type Article
Publication Date Jan 31, 2012
Journal Journal of Materials in Civil Engineering
Print ISSN 0899-1561
Electronic ISSN 1943-5533
Publisher American Society of Civil Engineers
Peer Reviewed Peer Reviewed
Volume 24
Issue 1
Institution Citation Hall, M. R., Dehdezi, P. K., Dawson, A. R., Grenfell, J., & Isola, R. (2012). Influence of the thermophysical properties of pavement materials on the evolution of temperature depth profiles in different climatic regions. Journal of Materials in Civil Engineering, 24(1), doi:10.1061/(ASCE)MT.1943-5533.0000357
DOI https://doi.org/10.1061/%28ASCE%29MT.1943-5533.0000357
Keywords Pavements; Heat transfer; Thermal diffusion; Temperature distribution; Numerical models
Publisher URL http://ascelibrary.org/doi/10.1061/%28ASCE%29MT.1943-5533.0000357
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf




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