Here are some images of the materials that are being combined to make the walls for the cob cottage.
Sand, concrete grade. A good rough, sharp sand. 10 yards.
Clay. The pile is being kept covered to preserve moisture. It rained four inches and the clay is nice and soft. I'm hoping to keep it that way as long as possible.
Water. 15 to 20 strokes of the pump per batch.
In the foreground is my helper and best friend right now, the cement mixer. In the background are the straw bales. 14 bales may not be enough even for this tiny structure. Sand, straw, clay, and water are added proportionally in the mixer in a specific sequence.