Not every asphalt reclamation application will call for a 950-hp machine. In fact, for jobs where a few inches of asphalt is mixed with the same amount of subbase, a 950-hp machine may be overkill.
However, when you start cutting beyond 6 inches of asphalt, encounter difficult Federal Aviation Administration (FAA) mix design specs or are in a deep-cut soil stabilization job with a lime slurry, having the extra power at hand helps to increase productivity. These bigger, more powerful reclaimer/stabilizers can power through dense material faster and with less effort.
During March’s ConExpo-Con/Agg show in Las Vegas, Terex Roadbuilding introduced its RS950B reclaimer/stabilizer. The RS950B offers a 12-cylinder, Cat C27 diesel engine offering 950 hp.
“The machine is built for those contractors who encounter jobs requiring high production or the power to cut through more than 10 inches of asphalt and mix it with the existing subgrade,” says Chad Harrison, engineer for Terex Roadbuilding.
All that power may also contribute to a more durable machine in the long run. “I like running V-12 engines,” comments Bob Durham, president of Durham Stabilization, Elk Grove, CA. “You’re not running at maximum horsepower potential, which makes the engines last about twice as long as 6-cylinder engines. We’ve run as many as 15,000 hours on V-12 engines in our machines.”
The RS950B marks Terex Roadbuilding’s reentry into the 800-hp-plus class of reclaimer/stabilizers. In the past, the company offered the 800-hp RS800 with a standard 8-foot cutter. However, with changing engine emission standards, the machine was discontinued a couple of years ago, leaving the 600-hp Terex RS600C as the largest reclaimer/stabilizer in its line.
Many contractors will notice that the new RS950B has a similar look and feel to the RS800. It features the same center-mount cutter design to distribute the machine’s full 70,500-pound weight over the cutter housing. A V-belt power band efficiently drives the standard 8-foot cutter at four different cutter speeds – 102, 131, 161 and 200 rpm – to match the torque required for the application. The machine also offers a 10-foot cutter and 58-inch-diameter mandrel at both 8- and 10-foot widths for making up to 20-inch-deep cuts.
The RS950B features four-wheel drive and steering. A high and low range transmission offers up to 210 fpm operating speed and a 5.8 mph transit speed.
The machine’s new 6.5-inch color display panel gives the operator an easy-to-read overview of critical operating system pressures, including charge pressure for the closed-loop hydraulic system. New mounting location positions the hydraulic tank toward the outside of the frame for quick access and ease of servicing.
“The RS950 is much cleaner in terms of hydraulic plumbing and wiring,” comments Durham.
Now in production and working in the field, the first RS950B reclaimer/stabilizer was shipped to California, where Durham Stabilization put it to work on a full-depth reclamation (FDR) project at Travis Air Force Base in Fairfield.
The existing asphalt runway, built to withstand the abuse of heavy military cargo airplane traffic, is being replaced by a concrete runway with asphalt shoulders.
At 150 feet wide and approximately 6,000 feet long, this is a challenging reclamation project for Durham Stabilization.
The difficult-to-reclaim asphalt mix included a 0.75-inch aggregate with an AR800 oil, designed under the Marshall mix standards. Just below the asphalt layer included 3 inches of Macadam, a 2- to 3-inch rounded stone with an oil binder.
“Macadam is asphalt that dates back to the 1930s and ‘40s, and it is very difficult to pulverize,” explains Durham. “Terex asked us to find something extremely difficult. This is it.”