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Thanks for your input! I found a supplier of crushed glass that is measured and sifted just like sand. They are constantly selling the stuff as a base for walkways, etc. I guess they have two sizes (1/4 and 3/8") mixed together to make it compactable and they have sifted out as much of the fine glass dust as possible. Price is comparable to the price of masonry sand (1/4 minus). I'm going to give it a try with this client, but let them know in no uncertain terms that this is an experiment (she seems to like doing these kinds of experiments) and that the work is not guaranteed.
I'll let you know how it goes!
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