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| Roadrain 100-2 | ||||||||||
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Maine Department of Transportation |
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In 1997, the Maine Department of Transportation, in conjuction with the University of Maine and the U.S. Army Cold Region Research Laboratory, began a series of in-ground field tests of pavement drainage and reinforcement materials. In the section of Route 1A, between Frankfort and Winterpost, frost heave and poor drainage were causing severe cracking, rutting and potholes. Frequent maintenance was required to keep the roadway trafficable. In some areas this maintenance had resulted in more than 12 inches (20 cm) of asphaltic overlay. It was determined in the planning stages of this test project that three test sections would incorporate a drainage geocomposite. To qualify, this geocomposite had to be highly resistant to crushing under dynamic and heavy loads, and had to be capable of rapid transmission of fluids (at least equivalent to 4 inches (10 cm) of free-draining base). Tenax Tendrain exceeded these criteria and was selected for use in the field tests.
Data from drainage monitoring outlets indicated that Tendrain provided excellent drainage based on AASHTO classifications. Tendrain was found especially useful for removing the most damaging waters present during the spring thaw. An improvement in the structural number was proven using the falling-weight deflectometer test. The results indicated a 50-75 percent increase in the structural number compared to the original roadway sections. This confirms that the long-term performance of the road would be greatly improved by incorporating the Tendrain drainage system. |
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