A cement mixer is the wrong type of mixer really, paper doesnt pulp by being tumbled. However...
I gather some people have used shredded paper plus cement in a standard cement mixer, but I've no experience with it. I'd also hazard a guess that if you added a couple of bricks it may help the paper partially pulp.
Its also possible to substitute some (or maybe even all) of the cement with clay. I vaguely wonder whether you could teach them about recycling by using starchy food leftovers from one day - you'd have to apply it thinly so it dries fast though, as with no lime it would otherwise moulder.
Finally a hand held kitchen blender can make small amounts. I've been doing that for test samples.
NT
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