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Title:Performance Evaluation of Longitudinal Pipe Underdrains
Author(s):Stein, Jeffrey S.; Dempsey, Barry J.
Subject(s):Pavement Subdrainage, Drain Pipe, Edge Drains, Drainage Envelope, Geotextiles, Filters
Abstract:This research was conducted under four study phases. Phase 1 involved a full scale laboratory study to evaluate three different underdrain pipe and envelope systems. It was found that an open graded FA-4 envelope material without a geotextile wrapped pipe was a viable design option. In Phase 2 a study was conducted to relate the pipe slot size to the envelope gradation. A testing procedure was developed. A 2 mm pipe slot prevented FA-4 envelope material from passing into the pipe. In Phase 3 it was found that a modified FA-4 material with control of the 0.075 mm aterial could be produced which would have an acceptable saturated hydraulic conductivity value for good subdrainage performance. The study in Phase 4 was inconclusive in terms of selecting geotextiles that would not clog in subdrainage applications. Neither the Gradient Ratio Test nor the Hydraulic Conductivity Ratio Test identified conclusively whether soil-geotextile combinations would clog in the field.
Issue Date:2004-10
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:not peer reviewed
Sponsor:Illinois Department of Transportation IHR-R25
Rights Information:No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161
Date Available in IDEALS:2013-11-14

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