[TowerTalk] tower base concrete strength?

[Pat Masterson]

If I order 3500 LB concrete from the supplier, how do I know that when
the truckload arrives, it doesn't contain a weaker mix? What are the
tests that can be performed before the stuff is poured into the hole?
Should I hire  a professional inspecter to do the tests? -pat

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*  Pat Masterson  V01-01,  Northrop Grumman,     *  Ham:KE2LJ
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