ESTIMATION OF SUBGRADE RESILIENT MODULUS FROM STANDARD TESTS. DISCUSSION

This is a discussion of a paper of the above title by E.C. Drumm, Y.U.Boateng-Poku, and T.J. Pierce published in the May 1990, Vol 116, No. 5 issue of this Journal. The discussers note that the replication of field density and water content by laboratory compaction will not allow good estimation of field characteristics from laboratory data. It is suggested that fabric replication may offer possibilities. Comments are also made on the confining pressure in the upper zone of the subgrade. The discussion is followed by a closure by the author.