Over the past 60 years, numerous studies have been conducted on the shear strength behavior of compacted clays. Most important for practical purposes are the influence of moisture content during compaction, and strategies for developing laboratory testing programs to evaluate shear strength for design. This paper provides a summary of the state of knowledge regarding the strength of compacted clays to aid in selection of design parameters and the development of compaction specifications. The compaction process and the structure of compacted clays are reviewed as they affect shear strength and volume change behavior. The influence of compaction conditions on shear strength and volume change are illustrated using the results of triaxial tests and consolidation tests on compacted Oak Harbor clay, a lean clay of medium plasticity from Oak Harbor, Ohio.
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