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GSI/GRI-GG5 and ASTM D6706

News, Q&A: GMA Techline | October 7, 2009 | By:

Subject: GG5 I referenced GSI/GRI–GG5 on a segmented retaining wall system spec and need to know if this is correct. Supposedly on your website this standard was crossed out and noted to refer to ASTM D6706. Should I replace GG5 with the ASTM standard? Please clarify. (Rebecca, New Jersey)

Reply: GRI–GG5 was the original test method on the subject but, subsequently, ASTM provided its own. So as not to have duplicate methods on the same subject matter, we deprecated ours. Do use the ASTM D6706 in this case.

Robert M. Koerner, Ph.D., P.E., NAE; E-mail:

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