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Evaluation of the gyratory compactor for use in designing asphaltic concrete mixtures : final report.
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1966-12-01
[PDF-5.60 MB]
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Alternative Title:Evaluation of the gyratory compactor for use in designing asphaltic concrete mixtures : Louisiana highway research.
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Abstract:The primary objective of this study was to evaluate the gyratory kneading compactor and to investigate the possibilities and capabilities of this type of equipment.
Curves were developed for six different asphaltic concrete mixes with varying compactive efforts and asphalt contents. These curves indicated that a wide range of compactive efforts can be applied by the gyratory compactor which would be a definite advantage over the presently used Marshall impact hammer.
Results showed that the optimum asphalt content can be obtained by means of the gyrographs which indicate whether or not the asphalt content for a mix at a given compactive effort is excessive.
Results of cores taken after 6 months of service showed that the void contents had decreased below the 75 blow laboratory design, indicating the need for a higher compactive effort in the laboratory, which may be beneficial in extending the service life of pavements.
The test results discussed herein deal with the gyratory machine as a compaction machine only. However, it is anticipated tot supplement this study to evaluate the shear and bearing resistance of asphaltic concrete mixes in the laboratory using the gyratory machine, and attempt to correlate these results with similar mixes in the field.
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