That mix could be completely wrong for your application and could even be inferior concrete. A bag is 94 pounds of cement, or about 1 cubic foot but if you order a 6-sack mix, all that tells you is how much portland cement is in the mix. When most contractors think about concrete mix design-if they think about it at all-the first thing that comes to mind is "bags" or "sacks." In the old days, when most concrete was mixed on site, cement was purchased in bags. It is everything that makes the concrete work well for your application: What slump do you need? What strength? Do you need entrained air? What happens if the day is particularly cold or hot? What size of aggregate is best? Should you ask for fly ash in the mix? Just what is concrete mix design? The American Concrete Institute doesn't even use the term, preferring mix proportioning, but mix design is really more than simply coming up with the proportions of each mix constituent. Time: 01:02 Learn about which mixes should be used for stamping, staining, and overlays.
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