I want to mix about 2 cu ft of concrete in a 6 cu ft electric concrete mixer, but before I do that I want to mix in a couple of pounds of dry additive for countertops. I did this once but it was very difficult. The problem that I had was that after mixing the dry ingredients thoroughly I started adding water, but a lot of the dry concrete stayed in the bottom of the mixer and had to be dug out and brought forward by hand which was really hard and slow! I believe that one of the problems was that I should have tried to tilt the mixer forward a little bit while mixing so all the dry mix wouldn't be so low in the bottom.
I'm looking for the best way to do this next time. My idea is to mix all of the dry ingredients thoroughly in the mixer and then empty out most of it in a big tub, tilt the mixer forward a little, put some of the water in the mixer and then start adding the dry (with the mixer on), add more water and then the rest of the dry. I'm trying to avoid the problems I had last time.