United States Department of Transportation
i
A Study of Factors Affecting the Permeability of Superpave Mixes in Kansas: Final Report
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2004-11-01
[PDF-1.28 MB]
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TRIS Online Accession Number:987637
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OCLC Number:57447211
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Edition:Final Report
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Abstract:Permeability influences the performance of Superpave pavements. Percolation of water through interconnected voids of an asphalt pavement causes stripping of the asphalt-bound layer(s) as well as deterioration of the foundation layers. Laboratory (falling head) permeability tests were conducted on different Superpave mixtures with 19 mm and 12.5 mm nominal maximum aggregate sizes (NMAS), and coarse and fine gradations, to identify factors that affect the permeability of these mixtures in Kansas. Hamburg wheel tests were performed to study rutting and stripping potential of these mixtures. Field permeability tests were also conducted on different projects with 19 mm and 12.5 mm NMAS Superpave mixtures in order to study the correlation between laboratory-measured and field permeability values. The results show that for any given nominal maximum size Superpave mixture, the fine-graded mixture is generally less permeable than the coarse-graded mixtures. Percent material passing 600-micron (No. 30) sieve, asphalt film thickness and air voids significantly influence the permeability of 12.5 mm NMAS mixtures. For 19 mm mixtures, significant variables are percent air voids in the compacted mixture sample, percent material passing 600-micron (No. 30) sieve and the number of gyrations required to reach the target air void. Superpave mixtures with lower permeability values performed, irrespective of gradation, very well under the Hamburg wheel rut tester indicating that less permeable mixtures are less susceptible to stripping and rutting. Optimum limits for the significant variables found in this study were determined so that the permeability of Superpave mixtures could be minimized. No significant relationship between the laboratorymeasured and the field permeability values was found.
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