I'd worry that the backfill would, moreso than the undisturbed earth around
it, leech out the water the concrete needs for curing.
That would more than erase any benefit from preventing evaporation. I
would think that letting it cure under a waterproof cover (poly, waterproof
paper, etc.) would result in a stronger anchor.
Is the surrounding soil porous? Here we have clay, which is often
> From: "Dick Green WC1M" <email@example.com>
> Date: 2006/09/07 Thu AM 11:13:02 CDT
> To: "Tower" <firstname.lastname@example.org>
> Subject: [TowerTalk] Filling in anchor holes
> As has been discussed extensively here, it's recommended that the
> concrete be kept moist during the cure time. That's a straightforward
> proposition for the pier, but is it standard procedure to leave the anchor
> holes open during the entire cure time so that the top surface can be
> moist, or is it OK to fill them in after the concrete sets (say, after a
> couple of days?) Wouldn't several feet of dirt act to keep the top surface
> of the concete from drying out too quickly? What do the experts do?
> Thanks & 73,
> Dick WC1M
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