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Thermal Conductivity of Pyroclastic Soil (Pozzolana) from the Environs of Rome

  • M. L. McCombie
  • V. R. TarnawskiEmail author
  • G. Bovesecchi
  • P. Coppa
  • W. H. Leong
Article

Abstract

The paper reveals the experimental procedure and thermo-physical characteristics of a coarse pyroclastic soil (Pozzolana), from the neighborhoods of Rome, Italy. The tested samples are comprised of 70.7 % sand, 25.9 % silt, and 3.4 % clay. Their mineral composition contained 38 % pyroxene, 33 % analcime, 20 % leucite, 6 % illite/muscovite, 3 % magnetite, and no quartz content was noted. The effective thermal conductivity of minerals was assessed to be about \(2.14\,\hbox {W}{\cdot } \hbox {m}^{-1}{\cdot } \hbox {K}^{-1}\). A transient thermal probe method was applied to measure the thermal conductivity (\(\lambda \)) over a full range of the degree of saturation \((S_{\mathrm{r}})\), at two porosities (n) of 0.44 and 0.50, and at room temperature of about \(25\,^{\circ }\hbox {C}\). The \(\lambda \) data obtained were consistent between tests and showed an increasing trend with increasing \(S_{\mathrm{r}}\) and decreasing n. At full saturation (\(S_{\mathrm{r}}=1\)), a nearly quintuple \(\lambda \) increase was observed with respect to full dryness (\(S_{\mathrm{r}}=0\)). In general, the measured data closely followed the natural trend of \(\lambda \) versus \(S_{\mathrm{r}}\) exhibited by published data at room temperature for other unsaturated soils and sands. The measured \(\lambda \) data had an average root-mean-squared error (RMSE) of \(0.007\,\hbox {W}{\cdot } \hbox {m}^{-1}{\cdot } \hbox {K}^{-1}\) and \(0.008\,\hbox {W}{\cdot } \hbox {m}^{-1}{\cdot } \hbox {K}^{-1}\) for n of 0.50 and 0.44, respectively, as well as an average relative standard deviation of the mean at the 95 % confidence level \((\hbox {RSDM}_{0.95})\) of 2.21 % and 2.72  % for n of 0.50 and 0.44, respectively.

Keywords

Mineral composition Modeling Pozzolana Thermal conductivity Thermal conductivity probe Tuff 

Notes

Acknowledgements

The authors wish to express sincere gratitude to Bavarian Environment Agency (Hoff, Germany), for conducting XRD/XRF analyses. Additionally, sincere thanks are due to Prof. G. Viggiani and M. Scaparazzi for their assistance in collecting Pozzolana samples. Finally, the authors would like to thank Mr. Owen Brown from Bedford Institute of Oceanography (Canada) for carrying out the textural analysis of the tested Pozzolana sample.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • M. L. McCombie
    • 1
  • V. R. Tarnawski
    • 1
    Email author
  • G. Bovesecchi
    • 2
  • P. Coppa
    • 2
  • W. H. Leong
    • 3
  1. 1.Division of EngineeringSaint Mary’s UniversityHalifaxCanada
  2. 2.Department of Industrial EngineeringUniversity of Rome “Tor Vergata”RomeItaly
  3. 3.Department of Mechanical and Industrial EngineeringRyerson UniversityTorontoCanada

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