The cuboid method for measurement of thermal properties of cement-based materials using the guarded heat flow meter

Naomi Patterson, Seyoon Yoon, Donald E MacPhee, Mohammed S Imbabi

Research output: Contribution to journalArticle

Abstract

Contact resistance can significantly affect the measurement of thermal conductivity of cement-based specimens using contact methods. A new method is proposed which has a reduced time and material requirement compared with the currently accepted methods: the Cuboid method. The Cuboid method requires just one cuboid-shaped sample of relatively small contact area, surrounded by insulation board, while the currently accepted two-thickness and multi-thickness methods require at least two samples of contact area greater than the metering area of the apparatus. Results from the Cuboid method and multi-thickness method were compared for specimens of Polymethyl methacrylate (PMMA) acrylic and hydrated CEM II Portland cement paste. The results differed by just 3.6% and 7.7% respectively for thermal conductivity measured in steady state condition. A non-steady-state method for the determination of specific heat capacity and thermal diffusivity of cement-based specimens, developed from the Cuboid method, is also presented. Relative uncertainties of the results for cement pastes measured in steady-state and non-steady state condition ranged from 2.2 to 11.5%.
Original languageEnglish
Pages (from-to)801-810
Number of pages10
JournalConstruction and building materials
Volume186
Early online date9 Aug 2018
DOIs
Publication statusPublished - 20 Oct 2018

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Cements
Thermodynamic properties
Ointments
Heat transfer
Specific heat
Thermal conductivity
Thermal diffusivity
Polymethyl Methacrylate
Portland cement
Contact resistance
Polymethyl methacrylates
Acrylics
Insulation
Uncertainty

Keywords

  • cement
  • concrete
  • heat flow meter
  • thermal conductivity
  • thermal diffusivity
  • specific heat capacity

Cite this

The cuboid method for measurement of thermal properties of cement-based materials using the guarded heat flow meter. / Patterson, Naomi; Yoon, Seyoon; MacPhee, Donald E; Imbabi, Mohammed S.

In: Construction and building materials, Vol. 186, 20.10.2018, p. 801-810.

Research output: Contribution to journalArticle

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abstract = "Contact resistance can significantly affect the measurement of thermal conductivity of cement-based specimens using contact methods. A new method is proposed which has a reduced time and material requirement compared with the currently accepted methods: the Cuboid method. The Cuboid method requires just one cuboid-shaped sample of relatively small contact area, surrounded by insulation board, while the currently accepted two-thickness and multi-thickness methods require at least two samples of contact area greater than the metering area of the apparatus. Results from the Cuboid method and multi-thickness method were compared for specimens of Polymethyl methacrylate (PMMA) acrylic and hydrated CEM II Portland cement paste. The results differed by just 3.6{\%} and 7.7{\%} respectively for thermal conductivity measured in steady state condition. A non-steady-state method for the determination of specific heat capacity and thermal diffusivity of cement-based specimens, developed from the Cuboid method, is also presented. Relative uncertainties of the results for cement pastes measured in steady-state and non-steady state condition ranged from 2.2 to 11.5{\%}.",
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