In modelling of early-age concrete on subgrade it is necessary to define at least basic physical properties of soil concerning thermal and moisture transfer. Where can I find the data concerning those properties for different soil types? I am mostly looking for thermal conductivity and specific heat, and I also wonder how the temperature of soil depending on the ambient temperature of air is determined. Finally I think about the strains which are caused by volume changes due to temperature and humidity variations - they depend on the coefficient of thermal and moisture content expansion - what are the values of those coefficients and are they non-negligible in relation to concrete? Can you suggest a book or an article on that matter?
To start the research on thermal conductivity of soils you might try
http://www.engr.uconn.edu/environ/envphys/pdf/vadose_pdf/Lecture17_Spring2004.pdf
It seems you answered your question. Thermal properties of soils depend on their mineralogy and water content, so it seems impossible to establish a reliable relationship between ambient (air) temperature and a temperature in the soil body.
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