The sweeping with the Broce machines before the actual asphalt placement was an important step to assure a clean, dry roadway for the new asphalt to bond with the milled surface. These are just several of the steps taken by Barriere crews to help produce maximum roadway longevity.
The Roadtec Shuttle Buggy SB-2500C MTV's function was to assure continuous paving in order to reduce any stop-start paver impact motions that could possibly reduce available financial incentives awarded to Barriere based on the smoothness and rideability of the final wearing surface.
The overall mainline travel lanes were resurfaced 3 1/2 inches deep in two lifts. Sixteen thousand tons of Level 2 Superpave binder course was put down in a single 2.5 inch thick pass for the two lanes on a .025 percent slope. No shoulders were resurfaced in this phase.
The 12,200 tons of Level 2 mainline Superpave mix was put down in a single, 1.5-inch thick lift. Both the 10 foot outside and 4-foot-wide inside shoulders were resurfaced at this time.
Compaction was accomplished using four Cat rollers, most working in the vibratory mode. The exception was a Cat pneumatic rubber-tired intermediate roller.
About the only unforeseen glitch in the operation came about when the Army Corps of Engineers shut down the Mississippi River to all traffic. Flooding in the mid-section of the nation caused a slight delay in the delivery of the necessary aggregate material. With the exception of this unavoidable delay, Barriere asphalt crews were able to average 2,500 tons of mix laydown per day.
What this project proved beyond a doubt is that, properly prepared, paved and compacted hot mix asphalt, as put down by a skilled contractor, like Barriere Construction Co., is one of the best available values in road building materials. Most civil engineers and economist will agree that it is easy to handle, has exceptional longevity and is very cost effective, especially on a unit cost basis.