1. ERDC Knowledge Core
  2. Engineer Research and Development Center (ERDC)
  3. Geotechnical and Structures Laboratory (GSL) - (2/23/2001 - present)
  4. Publication
  5. Technical Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/43549
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dc.contributor.authorRobinson, W. Jeremy.-
dc.creatorGeotechnical and Structures Laboratory (U.S.)-
dc.date.accessioned2022-03-09T20:05:44Z-
dc.date.available2022-03-09T20:05:44Z-
dc.date.issued2022-03-
dc.identifier.govdocERDC/GSL TR-22-4-
dc.identifier.urihttps://hdl.handle.net/11681/43549-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/43549-
dc.descriptionTechnical Reporten_US
dc.description.abstractThe U.S. Army Engineer Research and Development Center (ERDC) constructed a full-scale unsurfaced test section to evaluate the performance of two prototype geogrids, referred to as NX950 and NX750, in road applications. The test section consisted of a 10-in.-thick crushed aggregate surface layer placed over a very weak 2 California Bearing Ratio (CBR) clay subgrade. Simulated truck traffic was applied using one of ERDC’s specially designed load carts outfitted with a single-axle dual wheel truck gear. Rutting performance and instrumentation response data were monitored at multiple traffic intervals. It was found that the prototype geogrids improved rutting performance when compared to the unstabilized test item, and that the test item containing NX950 had the best rutting performance. Further, instrumentation response data indicated that the geogrids reduced measured pressure and deflection near the surface of the subgrade layer. Pressure response data in the aggregate layer suggested that the geogrids redistributed applied pressure higher in the aggregate layer, effectively changing the measured stress profile with an increase in pavement depth.en_US
dc.description.sponsorshipTensar International Corporation.en_US
dc.description.tableofcontentsAbstract ................................................................................................................................................... ii Figures and Tables .................................................................................................................................. v Preface ................................................................................................................................................... vii 1 Introduction ..................................................................................................................................... 1 1.1 Background .................................................................................................................... 1 1.2 Objective ........................................................................................................................ 1 1.3 Scope ............................................................................................................................. 1 2 Test Plan and Layout ...................................................................................................................... 3 3 Materials ......................................................................................................................................... 5 3.1 Subgrade ........................................................................................................................ 5 3.2 Aggregate surface ......................................................................................................... 7 3.3 Geogrids ......................................................................................................................... 8 4 Instrumentation ............................................................................................................................ 11 4.1 Earth pressure cells .................................................................................................... 11 4.2 Single-depth deflectometer ......................................................................................... 14 4.3 Bender elements ......................................................................................................... 16 4.4 Uniaxial strain gauges ................................................................................................. 18 5 Pavement Characterization ......................................................................................................... 22 5.1 As-built properties ....................................................................................................... 22 5.2 Falling weight deflectometer ....................................................................................... 23 6 Traffic Testing ............................................................................................................................... 25 7 Results ........................................................................................................................................... 28 7.1 Surface deformation ................................................................................................... 28 7.2 Impulse stiffness ......................................................................................................... 35 7.3 Subgrade pressure response ...................................................................................... 36 7.4 Aggregate pressure response ..................................................................................... 39 7.5 Single-depth deflectometer ......................................................................................... 42 7.6 Bender element response ........................................................................................... 45 7.7 Uniaxial strain gauge response .................................................................................. 50 8 Forensic Investigation ................................................................................................................. 53 9 Conclusions ................................................................................................................................... 60 References ............................................................................................................................................ 62 Appendix A: Deformation Data ........................................................................................................... 64 Appendix B: Pressure Cell Response Data ....................................................................................... 65 Appendix C: Single-depth Deflectometer Response Data .............................................................. 67 Appendix D: Uniaxial Strain Gauge Response Data ........................................................................ 68 Acronyms .............................................................................................................................................. 70 Unit Conversion Factors ...................................................................................................................... 71 Report Documentation Page-
dc.format.extent82 pages / 16.25 MB-
dc.format.mediumPDF-
dc.language.isoen_USen_US
dc.publisherEngineer Research and Development Center (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/GSL TR-22-4-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectGeogridsen_US
dc.subjectAccelerated pavement testingen_US
dc.subjectTrucks--Weight--Measurementen_US
dc.subjectUnsurfaced road performanceen_US
dc.subjectTraffic benefit ratioen_US
dc.subjectBase Course Stabilizationen_US
dc.subjectClay soilsen_US
dc.subjectUnpaved roaden_US
dc.subjectInterAxen_US
dc.subjectPavements--Performanceen_US
dc.subjectPavements--Testingen_US
dc.titleFull-scale evaluation of multi-axial geogrids in road applicationsen_US
dc.typeReporten_US
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