> My neighbors poured a new concrete floor over their
> old one and told me that they used some sort of special
> adhesive concrete that was designed to stick to the old
> work. They didn't do any rebar pinning and the new
> concrete had to be a fairly thin layer that was not
> able to support the weight on its own without the help
> of the existing concrete. This job worked perfectly.
> Has anyone heard of this magic concrete?
No, but I'd sure like some for my garage and shop aprons.
73
Roger (K8RI)
>
> Rick N6RK
>
>
>
>
>
> K8RI wrote:
>>
>>
>>
>>> Here's another (maybe stupid) question...
>>>
>>> I have a 25G tower with the bottom section partially embedded in
>>> concrete. Problem is the concrete was poured with the top only about
>>> an inch above ground. The base never moves but the surrounding earth
>>> frost heaves up slightly in winter. Spring snow melt and rain then
>>> deposits dirt and debris on top of the concrete where it then
>>> surrounds the tower legs. The tower is on sloped ground which
>>> promotes this action. I am tired of cleaning the dirt and debris off
>>> it every year and wonder what I can do to eliminate this situation.
>>>
>>> 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).
>>>
>> It's quite likely the junction between new and old would foum a boundray
>> layer where water would penetrate.
>>
>> There have been a couple of good suggestions of etching as well as
>> drilling
>> and using rebar.
>>
>> The typical etch is a dilute Muratic Acid which is then thouroughly
>> washed
>> away. It comes with directions. Drilling and adding rebar would also
>> help
>> keep the new bonded to the old. However as you are only looking at a
>> couple
>> of inches with out the need for strength you *might* get away by simply
>> doing the acid etch and wash prior to the small pour. OTOH if you have
>> the
>> room adding 6 inches of new concrete would give enough room to drill and
>> pin
>> with rebar and still have enough room to extend the concrete several
>> inches
>> above the rebar pins.
>>
>> Good Luck,
>>
>> Roger (K8RI)
>>
>>> 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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>>
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