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原文传递 Research on Fatigue of Asphalt Mixtures and Pavements in Nebraska.

题名：	Research on Fatigue of Asphalt Mixtures and Pavements in Nebraska.
作者：	aragao, f. t. s. kim, y. lee, j.
关键词：	nebraska, rutting, pavements, performance evaluation
摘要：	Hydrated lime has been recognized by the asphalt research community as a material capable to enhance various asphalt mixture properties and performance. In an attempt to mitigate moisture related damage, the Nebraska Department of Roads (NDOR) requires the use of 1.0 percent additional hydrated lime in the design of hot-mix asphalt (HMA) mixtures to be used in the roadways of the state. The 1.0 percent lime addition to pre-moistened aggregate may not be the best scenario to maximize pavement performance when pavement distresses such as fatigue cracking, rutting, and moisture damage are considered all together. Thus, it is necessary to investigate an appropriate amount of hydrated lime that would result in the most resistant mixture to various kinds of distresses when hydrated lime is specifically mixed with local asphalt paving materials in Nebraska. The current research project evaluated the stiffness (in the form of the dynamic modulus) and performance (permanent deformation and fatigue damage in both controlled-force and controlled-displacement modes) of mixtures with identical job mix formula and different only on the amount of additional hydrated lime (0.5 percent, 1.0 percent, 1.5 percent, 2.0 percent and 3.0 percent). Required testing facilities and devices were installed (or developed at the University of Nebraska (UNL) Geomaterials Laboratory) to allow this project to be conducted. Two testing modes were used: Indirect Tensile (IDT) and Uniaxial Tensile tests. The test results generally showed that the increasing trend of resistance to fatigue damage in controlled-force mode as more hydrated lime was added to the mixtures, which was not observed from the controlled-displacement fatigue tests. The number of cycles to failure reached its maximum value for the 1.5 percent additional hydrated lime case when the specimens were subjected to the controlled-displacement fatigue testing mode. Extra lime resulted in worse performance. The resistance of the mixtures to the permanent deformations was generally enhanced as more hydrated lime was added, but it seemed to have stabilized after the use of 2.0 percent hydrated lime. The findings from this project can be strengthened with more data and additional work. Suggested follow-up studies conclude this report. / NOTE: Research project rept. / Supplementary Notes: See also PB2007-104421. Sponsored by Nebraska State Dept. of Roads, Lincoln and the Federal Highway Administration, Lincoln, NE. Nebraska Div. / Availability Note: Available on CD-ROM and in color paper copy only. 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 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0817；60p
报告类型：	科技报告