[peteeng]

Hi Pippin here's a good read. Peter

[deprutser]

Hi Britt - Search for koehler article in the forum. The concrete guys have thrown out the graded approach. A two size mix seems to result in the best packing factor. Peter

Agreed. This guy [1] came to the conclusion 66% sand and 33% dust makes the most stiff bar. Moving to 33% stones, 33%sand and 33% dust yielded the same results.

[1] Epoxy granite stiffness - test and results
https://youtu.be/gjw5juGG1g8?t=1062

[peteeng]

Hi All - Very good video. Shame he didn't use an aluminium bar as a baseline in the tests. But if we look at his chart and most laminating epoxies are 3-3.5Gpa and if his stiffness rating is based on the deflections then the EG is ~10x stiffer. ie 3.5/1.2X10= ~30Gpa which is typically what the EG guys are getting. Peter