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John Fitzgerald
In Focus
Reged: 01/04/04
Posts: 1253
Loc: AR
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Re: concrete blocks encased in concrete footer?
07/02/08 11:42 AM
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IMO they are just large aggregate. If you fill the holes and the spaces between them it locks them in just like any other aggregate. See the post above from "Spoonsize". I have a refractor pier that is about 56" tall. The concrete part sticks up about 12". It is only about 18" to 20" in diameter in the largest spot and 3 feet into the ground with only three pieces of rebar. The stub the pier is bolted to is 12" in diameter and 12" tall. I poured it from "sackcrecte" mixed in a wheelbarrow, and put j-bolts in the top to bolt the pier flange to. This has been up nearly five years, with no noticeable settling or deterioration. No vibration noticed at over 300x. Not a substantial pier, but works very well. Goes to show that most piers are overbuilt.
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Observing since 1966
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