What reasons should cause a pour to be cancelled?
A., This will depend on the experience level of the finishers. The most detrimental environmental conditions are wind, dry/arid conditions, very hot weather, rain and freezing conditions. 1) Wind- Windy conditions will cause plastic shrinkage cracking to occur on the surface of the slab. This can be partially controlled with the use of fiber and a good curing method, but it is extremely advisable to postpone even if experienced finishing crew. 2) Dry/arid conditions- This is similar to wind in that it will cause plastic shrinkage cracking to occur. It can be combated with Con-film and concrete retarders as well as with proper curing methods. 3) Very hot- This can be combated with the use of our concrete retarder. You need to know how long you would like to have the concrete retarded for though (usually 1-1 ½ hours). 4) Rain- Depending on the amount of rain and placement of the concrete it may or may not be a requirement to cancel. The concrete can be covered with plastic (visqueen) if
