Originally Posted by
badhabit
I haven't done much research into EG vs. UHPC, it mostly seems like a "religious war" and in my opinion there is not a clear "winner". The biggest downside to UHPC (as far as i've research!) is that it behaves like a concrete(duh!) so it keeps "moving" for a very long time. EG does not, but it then have other properties that are undesireable(toxic before hardening, non-newtonic makes degassing problematic, it is a plastic makes process "dirty" and recycling hard etc) and EG is very(purely) dependent on the aggregate to get a good result(=high modulus)..
A modulus of 12 seems wrong, epoxy in itself is something like 3-4ish. So 12 seems low...i would expect at least double for a "professional solution".... i really need to do the test on my(and Stefs) mix using Silimix282... What was the coupon-size you cast for the test you made? Were your samples "perfect smooth square" or did you have an "open side" on your mold giving an rough side? I was thinking about casting a 800x20x20 coupon and stuffing it from the end making all sides smooth, but i'm worried about the air affecting the result "unfair" due to the narrow cross-section...and making the crosssection bigger increases the forces required to make deflection very quickly....
I haven't seen any information from Stef regarding accuracy tests for his machine, but his surfacefinish looks spot on(in aluminium though)....so that is mainly what i based my comment about Stefs machines performance on....
/Thomas