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
Choices
TypeValue
moist sample @ 20 $^{\circ}$C1.3
moist sample @ 90 $^{\circ}$C1.04
air dry sample @ 20 $^{\circ}$C1.0
air dry sample @ 90 $^{\circ}$C0.8
granular sample compacted fill0.58
granular sample loose fill0.34