Specifying the correct mix for your job can be the difference between long-term satisfaction or disaster. Concrete specifications consist of Strength, Slump (basically the thickness) and Chemical Additives.
Strength
Concrete Exposed to freezing and thawing temperatures should have a compressive strength of 3500 psi and have at least 5% entrained air (+/- 1.5%).
Slump
For our environment we recommend a slump of 4 inches (+/- 1″). Note: a slump greater than 4″ may prolong the time you have to wait before finishing, particularly in cool weather. It will also increase the tendency for shrinkage cracking.
Chemical Additives
In addition to air entraining admixtures, chemical additives may be used to accelerate or retard setting, reduce water or plasticize the concrete.
