Oh and yes there are alot of fines (similar to ODOT 304s. I don't know what they are called outside ohio) but I'm not familiar with relative density. We do run alot of sand and have problems with that sometimes too, but maybe that is another can of worms...
We do always dry the material at room temp. under fans before running the proctor, then add water to achieve points about 2% apart. How dry or how wet just depends on a visual evaluation. (e.g. 12 lbs material adding .24 lbs water is 2%) no point had more than .96 lbs water added and the all...
I'm perfoming a modified proctor on some crushed concrete to be used as fill and all of the moistures are coming out to within about +/- 1 % of each other (about 14%), reguardless of the apparent moisture content. This seems too high to begin with, adding that to the fact that they're all...
