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Posted by on May 11, 2007, 3:43 am
>On Thu, 10 May 2007 00:43:29 -0500, jwr@reiser.company.com wrote:
>
>>I had a left over half bag of ready-mix concrete. It's about 2 years
>>old. It was still powdery but had a few small chunks in it, which
>>easily broke up with my fingers. I filled a 8" round hole in my
>>sidewalk where there used to be a wooden post. The weather has been
>>in the 80s and it should have dried quickly. I mixed it so it was
>>like thick paste (the way it should be). 24 hours later it was all
>>sand-like and was not hard. I wet it down. (I know it should be kept
>>wet) and the whole surface washed off. Now it's all sand looking.
>>Does old cement go bad? It seems this stuff has.
>>
>>JWR
>
>
>Yes, old cement goes bad. To fix it, you have to put in
>in a big can with only a tiny hole in the top, and heat it
>till it glows. For about a day.
I fixed it. The stuff in the hole never got hard. It was like
compact sand. I dug it out of the hole, mixed a coffee can of
portland cement to the same stuff and reused it. It's hardening now.
I was lucky that a friend had a few pounds of portland cement left
from a job and he was going to toss it. This is probably a 50-50 mix,
so it should get very hard now.
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