Well, after only (I think) 3 days of drying, we tested the floor-mix bricks to see how they hold up to some wear and tear. Actually, all 5 mixes worked pretty well, considering all that is going to be happening to this batch is compression under the finished floor.
Still, it was fun to see how they held up. Melissa stood and rocked on each one:
we threw them around a bit, dropped them from shoulder height, and finally gave them the bridge test:
Actually only the one with the most clay survived this one. It was one part clay, one part sand (road base) and one part perlite.