Posted by tomturkey on April 29, 2014 at 11:21:41 from (216.81.211.253):
In Reply to: Concrete questions posted by JohnDeereJimOhio on April 29, 2014 at 09:32:57:
Concrete does not dry, it is called the hydration process, a chemical reaction between the water and cement. If the construction industry only placed concrete in the spring and fall, we in the midwest would never get concrete work completed. Spring the subgrade is wet and unstable, fall, days are shorter and low temps increase the cure time and potential for freezing. Concrete will crack at any temps, summer temps will increase this probability. So the use of control joints at 8 to 10 foot intervals will "cause a weak spot where the contracting or expanding concrete can relieve pressure and crack along your control joint cut. Cut must come within 24 hours of placing or as soon as cut can be made with out damaging the surface of the concrete and be approximately 1/3 the slab thickness. If this is a diy, do it in small bites, better to wait on the cure so your finish is what you desire, not fighting a flash set that you cannot catch up with. Do not add water to the surface to get a more workable concrete cream, it weakens the top 1/4 inch and will spall and durability and weather resistance will be compromised. orry for the long post, spent most of my working days around concrete. Buildings, bridges, roadways. Placed concrete in every month of the year. Just have to know what must be done to have the end result be a good product. I wish you well gobble
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