What is the most common problem that causes poor quality driveway pavements?
A. Asphalt mix must be delivered to the jobsite while it is still very hot, typically at least 250º F. Most driveway paving contractors do not produce their own mix and buy HMA from larger highway contractors that have asphalt plants. As a result, mix can be picked up at an asphalt plant that may not be close to the driveway’s location. The contractor may also let the truck loaded with HMA sit around for a period of time while the driveway area is being prepared for the asphalt placement. This can result in an unacceptable drop in mix temperature for proper placement and compaction. A poorly constructed driveway is often the end result of the mix being placed after it has gotten too cool. One way to help avoid this problem is to have a minimum mix temperature at time of placement be part of the contractual agreement with the contractor.
