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Posted by Billy Colburn on August 31, 2009, 12:27 am
whit3rd wrote:
>>>> There's 6 to 10 inches of exposed concrete foundation ...
>>>> This area needs some maintenance because there is some minor
>>>> crumbling going on ... I live in a
>> warm, dry climate. Practically a desert, but it does rain once in a
>> while. The house is close to 40 years old.
> Acid rain attacks concrete in wet urban areas, but it sounds like
> you actually might have concrete dehydrating (the water-of-
> crystallization
> removed by age). There are some treatments (in fireboxes,
> using sodium silicate helps), but basically, just wet it down a few
> times
> a year.
> A bad concrete mixture can have sandy pockets. Forty years ago,
> how likely was your area to have high standards and readymix
> trucks delivering fresh concrete to specification?
That I couldn't tell you for certain, but given the era I'd say the
quality of delivered concrete might well have varied.
--
Billy Colburn
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>around my house. About half of it is exposed to the soil and the other
>half is not because of concrete walkways etc.
>This area needs some maintenance because there is some minor crumbling
>going on now. I want to patch it and then paint it and need some advice
>on what materials to use.