Current test methods specify that the angle of gyration of a Superpaver gyratory compactor (SGC) be measured externally or outside of the mold. The external angle of gyration may not accurately portray the actual angle inside the mold during compaction. Significant differences in compacted density have been observed in specimens compacted with different SGCs. Measuring the angle of gyration inside the mold would reveal the cause for varied levels of compaction in different SGCs. The dynamic angle validator (DAV) was developed to measure the internal angle of gyration. The Florida Department of Transportation evaluated the DAV with several mixtures and compactors. Mixture stiffness had an effect on the internal angle measurement in some SGCs. Measuring and setting SGC angles of gyration internally statewide should reduce the variability in compacted density among different SGCs. Other factors not related to angle of gyration can contribute to density variability. The compactor needs to be clean and in good working order, and the molds and plates need to be checked for wear. These factors should also be addressed on a statewide basis.
Evaluation of the Dynamic Angle Validator
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 1891 , 1 ; 191-197
2004-01-01
Article (Journal)
Electronic Resource
English
Evaluation of the Dynamic Angle Validator
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