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Friction angle

Products | October 1, 2010 | By:

RE: Friction angle
What sort of phi (interface friction angle) would you expect between #57 crushed limestone gravel (0.5in.–1.5in.) and a textured HDPE membrane? Surely more than 10 degrees, right? What would a conservative estimate be, I wonder?
(Brian | Kentucky)

Reply: It would be more on the order of 25–30 degrees depending on the normal stress.

Bob Koerner | GMA Techline

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