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Thermal Conductivity of Pyroclastic Soil (Pozzolana) from the Environs of Rome by M. L. McCombie; V. R. Tarnawski; G. Bovesecchi; P. Coppa; W. H. Leong is a Engineering article available to read on EtoBox.

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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 W•m -1 •K -1 . A transient thermal probe method was applied to measure the thermal conductivity (λ) over a full range of the degree of saturation (S r ), at two porosities (n) of 0.44 and 0.50, and at room temperature of about 25 • C. The λ data obtained were consistent between tests and showed an increasing trend with increasing S r and decreasing n. At full saturation (S r = 1), a nearly quintuple λ increase was observed with respect to full dryness (S r = 0). In general, the measured data closely followed the natural trend of λ versus S r exhibited by published data at room temperature for other unsaturated soils and sands. The measured λ data had an average root-mean-squared error (RMSE) of 0.007 W•m -1 •K -1 and 0.008

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Author

M. L. McCombie; V. R. Tarnawski; G. Bovesecchi; P. Coppa; W. H. Leong

Publisher

Springer Science and Business Media LLC

Published

2016

Language

EN

Field

Engineering (Physical Sciences)