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Brett,
I'd second Alex's comment.
If you are not casting in a hold down plate, and are just dynabolting a peir, there is no need to stuff around fixing steel into place, you should just get the fibres added to your batch. Hymix and Hanson can help you out there.
If you are casting in a hold down plate, I would add at least a layer of top mesh (F72 or F82 at about 900m square) with about 40mm cover. Just jiggle it in when the concrete is added. Make sure the plate is level though, before you walk away to appreciate your work.
Joel
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