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原文传递 Evaluation of a Hot Mix Asphalt Perpetual Pavement.

题名：	Evaluation of a Hot Mix Asphalt Perpetual Pavement.
作者：	I. Battaglia; B. Bischoff; J. Ryan; S. Reichelt;
关键词：	perpetual pavement,hot mix asphalt,evaluation;strain gage instrumentation, mechanistic analysis, premature cracking;
摘要：	In 2003, WisDOT constructed two perpetual pavement test sections on the entrance ramp to I-94 from the Kenosha Safety and Weigh Station Facility in Southeastern WI. Test section 1 (TS1) HMA layers were constructed as follows: 2-in surface layer (PG 76-28, 6%air voids); 4.5-in middle layer (PG 70-22, 6%air voids); 4.5-in lower layer (PG 64-22, 4%air voids). Test section 2 HMA layers were constructed as follows: 2-in surface layer (PG 70-28, 6%air voids); 4.5-in middle layer (PG 70-22, 6%air voids); 4.5-in lower layer (PG 64-22, 6%air voids). The test sections were subjected to nearly 100%truck traffic with a projected 75 million ESALs over 20 years. After seven years in service, premature longitudinal and alligator cracking was present in the wheel paths of both test sections, with TS1 displaying a slightly higher level of distress. No rutting was observed in either test section. Forensic coring showed that the cracking was top-down. The early distresses were likely due to segregation and over-compaction that occurred during construction. Strain induced by trucks with known loads was measured using strain gages installed during construction. Strain at the bottom of the HMA pavement was typically lower than 70x10-6, the currently-accepted HMA fatigue endurance limit. Strains up to 100x10-6 were measured with high axle loads (47 kips), slow travel speeds (32 mph) and high pavement temperatures (90-103DGF). The perpetual pavement performance was acceptable overall. Distresses were limited to the surface HMA layer, which can be milled and replaced without affecting the lower layers. Strains were low at the bottom of the HMA pavement, indicating that the pavement system adequately resisted fatigue damage. Mechanistic analysis showed that low air voids (4 to 5%) in the lower layer provided the longest fatigue life. Low air voids are therefore recommended in the bottom layer to achieve maximum service life. / Title Note: Final rept. / Supplementary Notes: Sponsored by Federal Highway Administration, Madison, WI. Wisconsin Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A06 / NTIS In-house Control Codes: dotfha;12091,1101
报告类型：	科技报告