On 16 Aug 2007 at 11:56, Gene Smar wrote:
> Dana:
>
> For a small hole like that you probably can get away with poking at the
> concrete with a 2x4 piece of wood as it's being poured. The goal is to
> ensure there are no voids or air pockets in the concrete after it sets up,
> thereby reducing the ultimate strength of the pour.
>
> My tower's foundation is made of 10.5 cuyds of concrete so I rented an
> electric vibrator for the project. The 2x4 idea would not have been as
> effective for my project because of the volume of concrete, plus the
> foundation was undercut around the bottom edges and I wanted to make sure
> that that space was filled with mud.
When my base was poured (by a concrete professional) it was actually
pumped. The guy said that if you have the concrete mix correct and
the flow rate right, you can get a "standing wave" of the mix going
in that virtually assured that there would be no voids. No vibrating
necessary. I watched as he did it, and it was slick! Once he got
the hose flowing, it took 90 seconds to fill the hole it took me over
a week to dig! [2.3 cu. yds.]
73,
George T. Daughters, K6GT
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