Robert Ober
CEO, Plant Architects
Plant Architects
(210) 569-9262
Robert Ober is a recognized authority on concrete mixing and material handling. His 25 years of experience has seen him involved in some of North America's most important civil works projects...more»»
poring ready mix in the month of dec
Posted by leonard from deltona, FL, US on October 5, 2006
Dear Robert
This is my second request for this answer. I will be in Fayetteville NC in Dec visitng my daughter & son-in-law. I will be pouring a slab for a drive way about 5 yards What is your opinion on pouring in Dec??
Your help will be greatly appreciated
Many thanks
Leonard
Leonard,
I apologize for the untimely reply. We have had technical difficulties here on the Q&A service.
Well, the pouring of concrete can certainly be completed in December in NC--even in a "normal" year! The main problem is the slower set time experienced at +34˚ to +60˚ F. At these cooler temperatures you will get the best results actually. However, more care is required.
Although my Q&A is concerning the mixing technology, I'll go ahead here and really oversimplify what is required. First do not pour the concrete too wet--just wet enough to make it workable and finishable. Be sure to rod the concrete well and compact it thoroughly. Use very little sprinkle water to finish, as at cooler temperatures the mix water will creep to the surface more slowly and mot evaporate nearly as fast. Finally--and most importantly--do not pour on frost, and blanket the firm green concrete if the temperature nears frost!
