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I'm no expert either and I sometimes think the piers described here are a tad over engineered but,
it seems to me that unless you vibrate the concrete you run the risk of airpockets between the pavers that the concrete won't flow into and thus potentially causing problems further doen the track as areas of weakness or for groundwater to seep into and undermine the whole thing.
that's my 1.5 cents worth
niko
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