Some final advice
While there are many benefits to offering a high RAP mix, producing a quality mix is always your top priority.
“It’s nice to reduce the amount of virgin binder in the mixes through recycling, but make sure that the mix still performs well,” says Jackson. “Err to the conservative side when you are determining the asphalt content of your RAP. It will be easier to maintain a quality product if you have too much oil in the mix, that can be adjusted down, than having a dry mix. Besides you look a lot smarter when you can tell your boss that we can take some asphalt binder out instead of having to add a few tenths of oil to make the mix work.”
Partnering is essential to make high RAP mixes successful. Working with the state department of transportation, state asphalt pavement association, municipalities and industry suppliers is essential to bring new technologies to the market that will yield long lasting, sustainable pavements.
“Right now, it’s difficult to ask a DOT or municipal highway department to try something new since they are looking at making tough decisions with the limited funding that they have,” says Jackson.
“You have to provide them with performance data, cost savings and some assurances that this idea will work.,” he explains. “A DOT that is willing to take some risk in trying something new may find that they are receiving a substantial financial windfall in the long term.”