In more thermodynamic news, as of last March we know why Bennu (and Ryugu) don't hold heat well - has low thermal inertia. It's because Bennu's bigger rocks are cracked. Similar should hold for Ryugu and maybe Polana.
Apparently cracked geometry conducts heat more than just being porous. Porous rock would be analogous to cement, or to... C type meteorites, fused by the process of landing upon us.
The new cements we hope to make on Lunar bases will of course be more like S type meteorites, but the same porosity should apply. So, better sift out pebbles when making the cement.
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