Author(s):
W.M. Moore, L.J. Milberger
Publication Date
February 1968
Abstract
This report describes the evaluation of a gyratory compactor developed by the Texas Transportation Institute for the sole purpose of producing specimens of high uniformity for repetitive biaxial testing. The material selected for use in the evaluation was a crushed limestone. In prior investigations replicate specimens made from this limestone exhibited somewhat erratic behavior. In fact, of the several materials tested this material was by far the most troublesome. Nevertheless, it is an excellent flexible base material and widely used in this state.| The evaluation of the compactor resulted in an operating procedure that will produce nearly identical test specimens of this material over a wide range of moisture contents and densities. It was found that compacted specimens had replication errors in density of less than 0.4 pcf, in moisture content of less than 0.1 per cent, and in unconfined compressive strength of less than 8 psi. The authors believe that the observed replication errors are smaller than is now possible with any other known method of preparing similar specimens of granular materials for testing. Also, it is believed that the replication errors are of the same order of magnitude as now accepted in standard concrete, brick, and wood testing.
Report Number:
99-3
Link(s):
Document/Product
http://tti.tamu.edu/documents/99-3.pdf
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