Wet Handling Course Improvements


Transportation Research Center Inc. (TRC Inc.) has taken advantage of the late arrival of winter, installing new “wet handling” asphalt on portions of its Winding Road Course (WRC).

TRC Inc. worked closely with its engineering and construction firms to develop a pavement mix design that would meet its friction* target. The mixture also needed to provide a durable testing surface which will hold up in Ohio’s climate for a long period of time.

TRC Inc. customers can use the available and improved surfaces to identify tires with weak wet performance in the middle to low mu roach surface range. The mix has been applied to an 800-foot straight sections and three curves located on the WRC’s Short Course (see diagram), all of which are provided with sprinkler coverage.

During the end of winter 2016, TRC Inc. plans to replace the course sprinkler system with low spray patter sprinkler heads. In June 2016, TRC Inc. has plans to replace the remaining “standard” mu pavement on the WRC.

For more information about use of the WRC, please contact…

* Friction

Final conformance of the pavement surface corresponds to a slide friction coefficient of 0.35 (ranging from 0.30 to 0.50) as measured at 30 mph (48 km/h) with an ASTM E274 Locked Wheel Skid Trailer, ASTM E501 (standard rib) tire.

Due to the pavement geometry (horizontal curvature), locked wheel skid testing is not possible at most locations. Friction has been evaluated using a Dynamic Friction Tester (per ASTM E1911) or other appropriate equipment.

A correlation has been developed between the locked wheel skid trailer and the DFT or other appropriate equipment. This correlation has been used in determining final conformance of the low mu pavement surface at the WRC.