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Subgrade enhancement geotextiles

June 1st, 2010 / By: / From Our Readers

Editor’s Note: An August 2009 article briefly described a new California DOT (Caltrans) guide for using subgrade enhancement geotextiles. In a comment on this article, the reader poses a question, which is answered by (a) the author of the Caltrans guide and (b) Geosynthetics editor Ron Bygness.

Comment: SEG Guide error?

From: Wendel B.
Posted: Jan. 5, 2010

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 [seem] way too high for woven geotextile fabrics and I do not recognize the ASTM number used.

Thank you.

Re: SEG Guide error?

From: Ron Bygness, editor, Geosynthetics magazine
Posted: Jan. 21, 2010

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 column and the Final Inspection column in the February/March 2010 issue of Geosynthetics magazine for complete details.

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To post your thoughts on these comments, fill out the comment form on the bottom of the article “New Caltrans guide for geotextiles.”

Comments and letters can contain opinions of individuals who are writing and do not necessarily reflect the views of Geosynthetics magazine or the Industrial Fabrics Association International.

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