New Caltrans guide for geotextiles
Geosynthetics | August 2009
A new design guide for using “subgrade enhancement geotextiles” (SEG) in road construction has been produced by the California Department of Transportation (Caltrans).
The 18-page document is intended to assist pavement design engineers in five areas:
- What are SEGs and what functions do they serve.
- How to determine if geotextile materials are needed for a project.
- How to determine the material’s engineering properties.
- How to install and how to construct new pavement using geotextiles.
- Calculating cost savings, in the amount ofaggregate, by using geotextiles
For more information and to examine this guide: www.dot.ca.gov/hq/esc/Translab/ope/Subgrade-Enhancement-Geotextile-Guide.pdf.
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Comments are the opinion of individual posters and do not reflect the views of Geosynthetics or Industrial Fabrics Association International.
5:20 pm CST
SEG Guide error/typo
After reviewing your guide for SEG and having to respond to an engineer who has used your table for a local project, I wish to draw your attention to what I believe is an error within the property table. The puncture strength requirements are way to high for woven geotextile fabrics and I do not recognize the ASTM number used. I would like to have a response from you via e-mail.
Thank you
Wendel Benson California Paving Fabrics 1-800-443-6322
10:56 am CST
Re: SEG Guide error/typo
Thank you for your comment.
Here is a response from Imad Basheer, California DOT/Office of Pavement Design and author of “Guide for designing: Subgrade enhancement geotextiles”:
The puncture resistance values were based on the AASHTO M288-06 standard specifications for "Geotextile specifications for highway applications" and the FHAW publication No. FHWA HI-95-038 and its updated version FHWA NHI-06-116 titled "Geosynthetic design and construction guidelines." The puncture resistance test is given in ASTM D6241.
One further clarification from Geosynthetics editor, Ron Bygness:
Per current AASHTO M288 specifications, ASTM D6241 has replaced D4833. D4833 is no longer recognized by ASTM Committee D35 on Geosynthetics as an acceptable geotextile test method.
(Please see the GMA and Final Inspection columns in the upcoming February/March issue of Geosynthetics magazine for complete details.)
2:56 am CDT
geosynthetics
I search for a reference for how to use geosynthetics in pavement design.
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