This study evaluates the current state-of-the-art on intelligent compaction and begins by reviewing the basic principles of compaction, the current HA requirements for compaction of earthworks, and the development of performance specifications for earthworks. The history of the initial research on the topic in Sweden and the development of the theory of intelligent compaction are discussed. A review of commercially available equipment showed that different levels of sophistication are available from different manufacturers so that compaction-monitoring can assist the controlling operator or alternatively, provide for more fully automatic control of the vibration characteristics. Guidelines for continuous compaction control adopted in the specifications and regulations of other countries were investigated together with calibration data obtained from manufacturers and technical publications. The benefits and limitations of intelligent compaction techniques are discussed. Based on the findings of the study a draft specification is proposed for the Highways Agency to consider for possible inclusion in the Specification for Highway Works (SHW).

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