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- 2008354712 abstract "Granular shoulders are an important element of the transportation system and are constantly subjected to performance problems due to wind- and water- induced erosion, rutting, edge drop-off, and slope irregularities. Such problems can directly affect drivers' safety and often require regular maintenance. The present research study was undertaken to investigate the factors contributing to these performance problems and to propose new ideas to design and maintain granular shoulders while keeping ownership costs low. This report includes observations made during a field reconnaissance study, findings from an effort to stabilize the granular and subgrade layer at six shoulder test sections, and the results of a laboratory box study where a shoulder section overlying a soft foundation layer was simulated. Based on the research described in this report, the following changes are proposed to the construction and maintenance methods for granular shoulders: A minimum CBR value for the granular and subgrade layer should be selected to alleviate edge drop-off and rutting formation. For those constructing new shoulder sections, the design charts provided in this report can also be used to predict the behavior of existing shoulders. In the case of existing shoulder sections overlying soft foundations, the use of geogrid or fly ash stabilization proved to be an effective technique for mitigating shoulder rutting.".
- 2008354712 contributor B11202762.
- 2008354712 contributor B11202763.
- 2008354712 created "2007.".
- 2008354712 date "2007".
- 2008354712 date "2007.".
- 2008354712 dateCopyrighted "2007.".
- 2008354712 description "Final report.".
- 2008354712 description "Granular shoulders are an important element of the transportation system and are constantly subjected to performance problems due to wind- and water- induced erosion, rutting, edge drop-off, and slope irregularities. Such problems can directly affect drivers' safety and often require regular maintenance. The present research study was undertaken to investigate the factors contributing to these performance problems and to propose new ideas to design and maintain granular shoulders while keeping ownership costs low. This report includes observations made during a field reconnaissance study, findings from an effort to stabilize the granular and subgrade layer at six shoulder test sections, and the results of a laboratory box study where a shoulder section overlying a soft foundation layer was simulated. Based on the research described in this report, the following changes are proposed to the construction and maintenance methods for granular shoulders: A minimum CBR value for the granular and subgrade layer should be selected to alleviate edge drop-off and rutting formation. For those constructing new shoulder sections, the design charts provided in this report can also be used to predict the behavior of existing shoulders. In the case of existing shoulder sections overlying soft foundations, the use of geogrid or fly ash stabilization proved to be an effective technique for mitigating shoulder rutting.".
- 2008354712 description "Includes bibliographical references (p. 250-255).".
- 2008354712 description "Sponsored by the Iowa Highway Research Board and the Iowa Dept. of Transportation IHRB project TR-531 CTRE project 05-198".
- 2008354712 extent "294 p. in various pagings :".
- 2008354712 hasFormat "Also available via the Internet.".
- 2008354712 identifier request?id%3Doclcnum%3A154226942.
- 2008354712 identifier tr531.pdf.
- 2008354712 isFormatOf "Also available via the Internet.".
- 2008354712 issued "2007".
- 2008354712 issued "2007.".
- 2008354712 language "eng".
- 2008354712 publisher "Ames, Iowa : Center for Transportation Research and Education, Iowa State University,".
- 2008354712 relation "Also available via the Internet.".
- 2008354712 spatial "Iowa".
- 2008354712 subject "625.7/25 22".
- 2008354712 subject "Road shoulders. trt".
- 2008354712 subject "Roads Shoulders Iowa Design and construction.".
- 2008354712 subject "Roads Shoulders Iowa Maintenance and repair.".
- 2008354712 subject "TE212.5 .E33 2007".
- 2008354712 title "Effective shoulder design and maintenance / by David J. White ... [et al.].".
- 2008354712 type "text".