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Title: Experimental Observations of Mixing in an Aggregate and Fine Grained Soil System Subjected to Cyclic Loading with and Without Geotextile Separator
Accession Number: 01044057
Record Type: Component
Availability: Transportation Research Board Business Office 500 Fifth Street, NW Abstract: Geotextiles have been employed as separators between base and subgrade layers in pavements, but the presence of such a layer has effects on the mechanics and hydraulics of the system that are not well understood. Consequently, it is of interest to understand subgrade and loading conditions that lead to mixing. We thus conducted a repeated load triaxial testing program to examine mixing of coarse aggregate placed over a layer of silt. The dry density of silt, that was saturated prior to loading, was varied and the layered specimens were cyclically loaded over a range in deviatoric stresses without a geotextile. For silt compacted near maximum standard density, unsaturated specimens with and without a geotextile separator were tested as was a specimen with a separator in which the silt was saturated. On-specimen deformation gauges provided information on strains within each layer and across the interface between them. Mixing occurred in layered aggregate/silt specimens due either to downward movement of the aggregate or a combination of downward movement of the aggregate and upward movement of fines. Geotextile separators prevented mixing of the two materials in two medium-density silt specimens. When the silt was not saturated prior to testing, the geotextile separator improved system deformation. When the silt was saturated, the separator led to greater deformation possibly due in part to consolidation of the silt. Due to differences between experimental and field conditions, the geotextile performance should not be extrapolated to the field.
Monograph Title: Monograph Accession #: 01042056
Report/Paper Numbers: 07-2881
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Henry, Karen SCole, David MDurell, Glenn DPagination: 23p
Publication Date: 2007
Conference:
Transportation Research Board 86th Annual Meeting
Location:
Washington DC, United States Media Type: CD-ROM
Features: Figures; Photos; References
(9)
TRT Terms: Uncontrolled Terms: Subject Areas: Geotechnology; Highways; Pavements; I23: Properties of Road Surfaces; I42: Soil Mechanics
Source Data: Transportation Research Board Annual Meeting 2007 Paper #07-2881
Files: TRIS, TRB
Created Date: Feb 8 2007 7:35PM
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