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Thermal resistivity of bentonite filling

In the paper "Thermophysical Properties of Bentonite" by Plötze et al. from 2007, the thermal characteristics of different highly compacted bentonite blocks as well as granular material of compacted bentonite were characterised. These values are approximative and for reference only.

Symbol
$\rho_{d,fill}$
Unit
K.m/W
Used in
$T_{4d}$
Thermal resistance for daily load cycle [K.m/W]
$T_{4i}$
Thermal resistance of medium in the duct [K.m/W]
$T_{4w}$
Thermal resistance for weekly load cycle [K.m/W]
$T_{4y}$
Thermal resistance for yearly load cycle [K.m/W]
Choices
TypeValue
moist sample @ 20 $^{\circ}$C0.77
moist sample @ 90 $^{\circ}$C0.96
air dry sample @ 20 $^{\circ}$C1.0
air dry sample @ 90 $^{\circ}$C1.25
granular sample compacted fill1.72
granular sample loose fill2.94