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原文传递 Field Validation of Wisconsin Modified Binder Section Guidelines.

题名：	Field Validation of Wisconsin Modified Binder Section Guidelines.
作者：	delgadillo, r. motamed, a. bahia, h.
关键词：	binders,pavements,asphalts/specification guidelines, parameter validation, mixing temperatures, compaction temperatures, fatigue, low temperature cracking, guidelines, databases, recommendations, methodolgy, highway construction materials, rutting/
摘要：	In June 2005, a report with Modified Binder Selection Guidelines for Wisconsin was finished under the sponsorship of the Wisconsin Highway Research Program. The report name is Development of Guidelines for PG Binder Selection in Wisconsin (SPR No. 0092-01-01). In that report five areas were covered for the guidelines: binder storage and stability; mixing and compaction temperatures of binders; fatigue characterization; low temperature cracking and rutting characterization. The results of the project included the development of new specification guidelines. The new specifications included some new parameters: Zero Shear Viscosity ZSV mixing and compaction temperatures limits; a critical cracking temperature obtained using BBR, DTT and Tg testing for low temperature characterization; a fatigue parameter called Np20 obtained by time sweep testing in the DSR; and a rutting parameter called Gv obtained by repeated creep and recovery using the DSR. The present report deals with the field validation of these new parameters. It is divided in four chapters. Each one dealing with one of the topics. The first chapter is Mixing and Compaction Temperatures. Eight different projects were surveyed and sampled for this section. The study concluded that compaction in the field happens at temperatures ranging from 120oC to 70oC. The compaction temperatures from ZSV are too high and no realistic. The temperature at which the binder has a low shear viscosity of 50 PaDTs is recommended as a lower limit for compaction in the field. The mixing temperatures using ZSV are lower and more appropriate than the ones recommended by the Superpave Criteria. The current procedure for determining ZSV temperatures, however, includes significant extrapolations that make the results inaccurate. A better procedure should be developed before implementing this method. Eight projects were considered for the fatigue validation. The fatigue parameter Np20 showed good correlation with the longitudinal cracking in the field. No good correlation was found between G*sin and the field data. A new surrogate test using stress sweep was also compared with field data and no good correlation was found. / NOTE: Final rept. 2003-2007. / Supplementary Notes: Sponsored by Wisconsin Dept. of Transportation, Madison. Div. of Transportation Infrastructure Development. / Availability Note: Product reproduced from digital image. 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.
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