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.
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.
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