absolutely no idea sorry ... it stands to reason (read extract below) but I am no scientist. If anything it probably acts as a constant. I think the coefficient of thermal expansion, apparent density and porosity would have more significant impacts. Again, not a science guy. Sounds more like a Frank Houllis question, he can be pretty helpful if you can get a hold of him.
Oh and this is a good read. I read it ages back and cbf reading it again... ever! haha. Your answer could be buried in there too ! cheers and good luck, let me know if you find an answer
