United States Department of Transportation
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TRIS Online Accession Number:01054645
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Edition:Final Report
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Abstract:Providing adequate drainage to a pavement system is an important consideration to prevent premature failures due to water related problems, such as pumping action, loss of support, and rutting. Ohio Department of Transportation has adopted several types of materials specifications for permeable bases: (a) ODOT 307 base, including IA, NJ, and CE types, (b) ODOT 306 Cement Treated Base, (c) ODOT 308 Asphalt Treated Base. This research is aimed at investigating the effectiveness of these drainable base materials under asphalt pavements. Both laboratory tests and in-situ monitoring has been carried out. Specific conclusions are as follows: (I) There was no evidence of developing full saturation in the cohesive subgrade soils; (II) The order of drainage efficiency can be established into three categories: (a) ODOT 306 Cement Treated base (25,345 ft/day) and ODOT 308 Asphalt Treated base (25,061 ft/day), (b) ODOT 307 NJ base (3,830 ft/day), ODOT 307 CE (3,705 ft/day), and ODOT 307 IA base (2,280 ft/day), and (c) ODOT 304 medium gradation (1,417 ft/day); (III) The cement treated base materials exhibit the highest resilient modulus values, even after 15 cycles of freeze/thaw conditioning; (IV) The asphalttreated base materials exhibit relatively higher resilient modulus values than the unbound base materials; (V) The resilient modulus of the unbound base materials, particularly ODOT 304 fine gradation, is sensitive to the percentage of fine content and saturation; (VI) The resistance to permanent deformation of ODOT specific drainable base materials can be ranked from high to low as follows: Cement-treated base, ODOT 307 CE, ODOT 307 IA, ODOT 304, ODOT 307 NJ, ODOT 308 (asphalt treated base) at 77 degree F, and ODOT 308 at 104 degree F.
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