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OK then, another experiment. On that job I talked about, try pulling up some pavers before you've done the final tamping, and then again after. I think you'll find the bricks after tamping are harder to remove. The sand removes the ability for the bricks to move from side to side, and the granular friction to the sides of the bricks tends to lock them in place.
I've seen sand almost half way up the bricks after tamping.
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