In bidding a job, concrete contractors have to estimate the duration of each concrete placement, which requires estimating the concrete's setting time. When cold weather, admixtures, or other factors delay setting and increase the time finishers must wait, the contractor starts losing money. But how much money?

To help answer this question, Concrete Construction surveyed contractor members of the American Society of Concrete Contractors. Fifty contractors responded to the following survey questions: How long do you expect finishers to wait before they begin floating concrete at temperatures of 50, 70, and 90 degrees F? What are the labor and equipment costs in your area for a finishing crew? What's the additional cost per cubic yard in your area for an accelerated-set concrete?