Cost Benefits
The HIR processes allow same day return to traffic and are more environmentally friendly than asphalt pavement mill and fill techniques.
- Recycling 100% of the material in-place
- Less trucking of milled material from site and new HMA to the site
- No extended road closures due to same day return to traffic
Factors that may Impact Cost
- Size of project
- Project Phasing: Multiple location projects vs. single location projects (5-mile job on 1 road vs. 1-mile job in 5 different places)
- Traffic maintenance (easier to do 1 lane the full job length, harder to do both lanes to the same point each day)
- Urban work (manholes / catch basins, intersection control add to cost) vs. rural work
- Night work (costs more for labor but less traffic disruptions)
- Bidding/Tender date vs. completion date, number of working days
- Raw material pricing (rejuvenating agent, heating fuel, HMA, new aggregates)
- Competitive bids (number of contractors in Region)
Decrease Cost Without Affecting Quality
- Perform pre-construction testing and evaluation (drainage, subgrade, structure, paving fabric, etc.)
- Provide mix design with bidding/tender
- Early bidding/tender closing (ideally Oct-Dec for the next year’s work)
- Clear, constructible specifications
- Fair assignment of risk
- Consistent annual HIR program
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