Bruno good post my agree ratio is 100%.
Here is some unqualifyed blurbs.
Epoxy does not shrink,esp with 90% filler.
A large batch of raw mixed epoxy can reach 170 C.This should never happen to us as the high filler loading absorbs the exotherm heat.If it did,would this temp be high enough for rebar to expand?If so I forsee problems as the steel would expand and the epoxy would not.TCE of aluinium is similar to epoxy I beleive.
I could not see reaching these temps with the low epoxy ratios we demand.
Beleive me,a pot of one gal of epoxy will"smoke if not spread in thinner layers.
Here is a copy of previous observations:
Temperature:
Heat lowers viscosity and accelerates cure dramatically: from 25~ to 50~ C, viscosity drops over 90% (e.g.: 10000 to 500 cps). 12 hours hardening @ 25/C becomes 10 minutes @ 80/C or 5 min. @ 120/C. Therefore, winter & summer, outdoor & indoor applications may require vastly different initial viscosities and pot lives. Below 10/C (50/F), cure and viscosity can be so affected that special compounds are needed.
Larry