Mixing and Pouring Concrete in Cold Weather

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Old 12-21-09, 02:57 PM
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Mixing and Pouring Concrete in Cold Weather

I'm building an astronomical observatory in my back yard. I already have the lower section of the concrete pier (which will hold the telescope) poured to below the frost/freeze line, which is 30 inches below grade here. That section was poured a month ago. I left some 1/2-inch re-rod bent over and sticking out of the top of the lower pier and plan to put an additional three or four feet above ground using a 12-inch diameter "sono tube". It's winter, of course, so I'm wondering what the outdoor temp needs to be given that none of the pour will be below ground. Since it will only be about 4 cu ft I plan to buy some bags of redi-mix and mix it myself. Any suggestions, or things to be aware of regarding the cold temps? What about making sure the new pour "bonds" with the lower pour?

Thanks in advance!
Mike Potter
Baltimore, MD
 
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Old 12-21-09, 04:18 PM
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Old 12-21-09, 04:41 PM
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Thanks for the link drooplug!
 
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Old 12-22-09, 12:00 AM
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Well the article is descriptive enough.. But still I would avoid pouring concrete in cold weather.
 
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Old 12-22-09, 10:17 AM
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Very cool. What kind of drive and scope are you going to mount on it?
 
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