[TowerTalk] Extending a concrete base?

[Jim Rhodes]

There are chemical "treatments" that are supposed to enable bonding 
between new and old concrete. I think that they are some type of acid 
that etches the surface to bond to the new concrete. If I was doing 
this I would probably dig around the sides of the old base so that 
the "cap" was larger and went down the sides of the old pour a few 
inches so as to provide a better "seal".

At 01:27 PM 9/24/2007, Paul Kelley N1BUG wrote:
>If I clean (wire brush?) the top of the existing concrete, build a
>wood form around it and simply pour another few inches of concrete
>on top, will I be helping or making matters worse? I am wondering if
>the new concrete will adhere to the old stuff adequately, or if
>water may tend to get in between old and new layers (where it would
>no doubt freeze and cause bigger problems).
>
>I have worked with concrete quit a bit, but have never poured new on
>top of old. Any advice would be appreciated.
>
>Thanks & 73,
>
>Paul N1BUG
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Jim Rhodes K0XU
jim at rhodesend.net

Experience is the thing you have left when everything else is gone.