Published: Jan 2000
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In the early 1960's, the Soil Conservation Service (now Natural Resources Conservation Service) established some procedures for agency use in making laboratory and field tests for control of density and water content of compacted soil containing variable amounts of rock particles. The procedures included guidance for when the rock particles would undergo some breakdown during the compaction process. This paper summarizes the procedures, providing an awareness of them to interested parties, and compares them to those established by others. Although the procedures in TR-26 and TR-27 are less than definitive in some instances, the guidance regarding evaluation of breakdown and testing methods for these soils helps to satisfy the need for evaluating these soils. Further studies using the procedures in TR-26 and TR-27 may be useful in providing more usable techniques for design and construction testing of soils containing rock that is subject to particle breakdown during the compaction process.
compaction of soil, compaction testing of soil containing rock, rock breakdown, non-durable rock, compaction testing
Senior Technical Manager, GEI Consultants, Inc., Raleigh, NC