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Edition:Final report; Sept. 1994- Dec. 1995
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Abstract:The use of pavement underdrains became common practice in Illinois following the issuance of a Department underdrain policy in December 1970. Since that time, a variety of materials have been incorporated as underdrains. As these materials evolved, IDOT?S standards and specifications were modified and unacceptable products were rejected from further use. This evolution, along with cost
considerations, has led to the dominance of geocomposite drainage mats and perforated, corrugated, polyethylene (PE) tubing in the marketplace. However, within the past few years, there have been increasing concerns within the Department regarding the effectiveness of IDOT?S underdrain systems, particularly those incorporating geocomposite drainage mats. These concerns were raised in part by the discovery of considerable deposits of silt in drainage mat samples recovered during the reconstruction of I-80 near Morris in 1993. In addition, some districts had strong reservations regarding drainage mats. It was eventually decided in September 1994 that the best approach would be to conduct a research study to determine the relative field performance of the major underdrain types approved at that time. This report outlines the findings of that study.
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