A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Geocomposite capillary barrier drain (GCBD) for limiting moisture changes in pavements
Excess moisture coupled with inadequate drainage are believed to be the primary causes of roadway distress and failure. Manifestations of moisture-related distresses such as rutting, potholes, longitudinal and shrinkage cracking are commonly observed in bituminous pavements. In concrete pavements, moisture-related distresses are manifested as pumping. faulting, corner breaks, and longitudinal cracking. These distresses diminish the structural integrity of the pavement and reduce pavement life. To address moisture-related distresses, pavement engineers typically construct subsurface pavement drainage systems. A pavement research project, evaluating the effectiveness of an innovative pavement drainage product, a Geocomposite Capillary Barrier Drain (GCBD), is now under way at the Minnesota Road Research Facility (MnROAD) in Albertville, Minn. The project is funded by the NCHRP Highway IDEA Program and by a FHWA Pooled Fund Project/TPF-5 (136). It is a collaboration among three organizations: the University of New Mexico (UNM), the U.S. Array Engineer Research and Development Center's Cold Regions Research and Engineering Laboratory (ERDC-CRREL), and the Minnesota Department of Transportation (MnDOT). The geocomposite capillary barrier drain (GCBD) is a three-layer composite, from top to bottom: a transport layer (a specially designed geotextile), a capillary barrier (a geonet), and a separator (geotextile). When placed between a base and subgrade, it can drain the unsaturated base and reduce its water content as well as prevent water from reaching the subgrade. Based on previous laboratory testing and field experience, the GCBD is expected to increase the rate and amount of drainage from the pavement system. This has implications for mechanistic pavement design. A design tool will incorporate numerical simulations of unsaturated flow within a pavement section. Initial conditions and climatic conditions will be used as input to the simulations.
Geocomposite capillary barrier drain (GCBD) for limiting moisture changes in pavements
Excess moisture coupled with inadequate drainage are believed to be the primary causes of roadway distress and failure. Manifestations of moisture-related distresses such as rutting, potholes, longitudinal and shrinkage cracking are commonly observed in bituminous pavements. In concrete pavements, moisture-related distresses are manifested as pumping. faulting, corner breaks, and longitudinal cracking. These distresses diminish the structural integrity of the pavement and reduce pavement life. To address moisture-related distresses, pavement engineers typically construct subsurface pavement drainage systems. A pavement research project, evaluating the effectiveness of an innovative pavement drainage product, a Geocomposite Capillary Barrier Drain (GCBD), is now under way at the Minnesota Road Research Facility (MnROAD) in Albertville, Minn. The project is funded by the NCHRP Highway IDEA Program and by a FHWA Pooled Fund Project/TPF-5 (136). It is a collaboration among three organizations: the University of New Mexico (UNM), the U.S. Array Engineer Research and Development Center's Cold Regions Research and Engineering Laboratory (ERDC-CRREL), and the Minnesota Department of Transportation (MnDOT). The geocomposite capillary barrier drain (GCBD) is a three-layer composite, from top to bottom: a transport layer (a specially designed geotextile), a capillary barrier (a geonet), and a separator (geotextile). When placed between a base and subgrade, it can drain the unsaturated base and reduce its water content as well as prevent water from reaching the subgrade. Based on previous laboratory testing and field experience, the GCBD is expected to increase the rate and amount of drainage from the pavement system. This has implications for mechanistic pavement design. A design tool will incorporate numerical simulations of unsaturated flow within a pavement section. Initial conditions and climatic conditions will be used as input to the simulations.
Geocomposite capillary barrier drain (GCBD) for limiting moisture changes in pavements
Kapillarbarrieredrainage aus Geoverbundstoffen (GCBD) für die Begrenzung des Feuchteaustauschs in Strassenbelägen
Roberson, Ruth (author) / Stormont, John (author) / Henry, Karen (author)
Geosynthetics ; 24 ; 30-34
2006
5 Seiten, 11 Bilder
Article (Journal)
English
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