"The idea was to get the top 1/2 inch warm so we could add the new material and recompact," Kieswetter says. "Though the heat was less intense at the surface, the increased exposure of the surface to the heat provided just the right softening they needed."

Aggregate Industries had some material it has stockpiled for utility cuts in the future and they tested the joint repair process using that and realized that while they could rework some the heated joint and the added material a little, luting and raking was difficult as the sticky binder cooled quickly, and reworking quickly caused additional segregation.

Their solution was to use the hot box recycler to heat some of the stockpiled product. Once heated Aggregate Industries removed the coarse aggregate, added additional binder, and remixed it. Over two days Aggregate Industries reheated the fines-heavy mix, reheated the joint, added the new material, then compacted the joints using an Ingersoll Rand DD 24 dual drum vibratory roller.

"Aggregate Industries did all the work, and they really did a nice job from beginning to end and ended up with a very satisfying appearance," Kieswetter says. "The moral is: Always preheat longitudinal joints so you always have a hot joint to pave against."