01143744

Monograph

http://onlinepubs.trb.org.../NCHRP113_Final_Report.pdf

The overall purpose of this Innovations Deserving Exploratory Analysis (IDEA)project was to facilitate the transfer of the geocomposite capillary barrier drain (GCBD) technology to engineering practice through demonstration and documentation of GCBD fabrication, field installation and performance, and the development of the capability to incorporate the GCBD in subsequent designs. The transport layer is the key element of the GCBD, and a material referred to as TGLASS was selected as the best available transport layer material. This material was used in the MnROAD field test. There has been discussion with a geosynthetic manufacturer regarding the production of a lower cost transport layer. A method to connect the GCBD to the edgedrain pipe system was developed in the laboratory and used in the MnROAD demonstration. Details and specifications regarding the field installation of the GCBD system were developed and implemented at MnROAD. The laboratory testing, field measurements and design calculations conducted during this project indicate that the GCBD provides specific benefits, including: reduced equilibrium water content in base course; prevention of positive pressures in base course; reduced wetting of underlying subgrade due to infiltration; and prevention of capillary rise of water from subgrade into base.

This NCHRP-IDEA project was conducted by the University of New Mexico in cooperation with the United States Air force Academy and the U.S. Army Cold Regions Research and Engineering Laboratory. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Highway IDEA Project 113

NCHRP-113

English

85p

2009-4

NCHRP-IDEA Program Project Final Report

Final Report

Print

Appendices (1) ; Figures; Photos (1) ; References; Tables

Base course (Pavements); Benefits; Capillary water; Field tests; Geosynthetics; Installation; Laboratory tests; Moisture barriers; Moisture content; Pavement design; Specifications; Subgrade (Pavements); Technological innovations

Innovations Deserving Exploratory Analysis (IDEA) (Program); Minnesota Road Research Project (MnROAD)

Geocomposite capillary barrier drains

Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers; I42: Soil Mechanics

TRIS, TRB

Nov 4 2009 10:20AM