Fast, easy tutorial from Lenore of Evil Mad Scientist Labs. I wonder whether you might not use polystyrene beads as an aggregate to reduce weight?
Make: Halloween Contest 2009
Microchip Technology Inc. and MAKE have teamed up to present to you the Make: Halloween Contest 2009! Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.
Yes, you can use styrofoam beads as aggregate to bring the weight down. In fact, shredded styrofoam packaging would work just fine in this application. I have quite a bit of experience making lightweight concrete for the national concrete canoe competition. http://content.asce.org/conferences/nccc2009/
Nice post to read, all about a very nice blog and good stuff to read here.
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