Martin Product Sales LLC
Hot In-Place Recycling
“Hot in-place recycling (HIR) has proven to be a viable technique for rehabilitation of pavements at low cost by using existing in place materials.” – FHWA SA-98-042
Quick, Cost-Effective and Environmentally Friendly
The Hot in-place Recycling (HIR) process involves heating and scarifying the existing pavement to a depth of ¾ to 1½ inches, and treating the scarified material with an asphalt rejuvenator. There are a couple of different methods for the HIR process. In one, the train of equipment scarifies and recycles the old pavement, then lays the recycled mix and a virgin hot mix wearing surface. This special equipment has two screeds—the first screed lays the recycled mix as a leveling course, and virgin hot mix is fed through the second screed for the surface course. This one-pass process moves quickly with minimal traffic delay. In another process, the recycled mix is re-laid with a paver and compacted. This may be left as is, or resurfaced later with a new hot mix.
The asphalt rejuvenator may be emulsified, cutback or a soft asphalt cement, and it may have rejuvenator oils, polymers or other additives; or it may be unmodified asphalt. During the mixing of the scarified material with the rejuvenator, additional aggregate or other additives may also be blended in to correct the gradation or improve the mix.
Martin Asphalt Products for HIR