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Re: friction coefficient on rock

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AASHTO table 5.5.2B gives a whole range of friction coefficients for
sliding between dissimilar materials. Mass concrete against clean sound
rock is 0.70. Formed concrete against clean sand is 0.30-0.40.

Michael Ludvik, PE
Structural Engineer
Hardesty + Hanover

             "Joe Grill"                                                   
             >                                                          To 
             10/28/2004 12:29                                           cc 
                                       friction coefficient on rock        
             Please respond to                                             

After excavation it is found that a retaining wall will be founded on solid
rock (sandstone). Can anyone give me a friction coefficient for this
condition if any?  I don’t have a reference that addresses this situation.
Joe Grill

                           Joseph R. Grill, P.E.