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Case history : use of Tenax and Tensar geogrids for base course stabilization : technical assistance report.
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1999-01-01
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[PDF-2.20 MB]
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Alternative Title:Case history : use of Tenax and Tensar geogrids for base course stabilization.
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Abstract:Geogrids can be used successfully for subgrade stabilization under permanent pavements. To be successful, proper designs incorporating existing soil conditions and anticipated loading need to be performed. subgrade soil strength should be determined from laboratory tests or cone penetrometer tests.
Tenax MS220 and Tensar BX1100, geogrids of similar tensile modulus, performed equally in the field when exposed to similar conditions.
For the geogrids to have a better chance of success on weak subgrades, the appropriate base course aggregate size should be specified in the contract.
Caution should be taken when specifying geogrids under the base course for asphalt pavements. Although failures were reduced in stage II which allowed the concrete pavement to be constructed, achieving density on an asphalt pavement would have been difficult. An additional geogrid subgrade layer would be required to resist movements from pumping actions.
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