主题：Modifying Laboratory Mixture Design to Improve Field Compaction

主讲人：Dr. John E. Haddock

时间：2015年6月9日10:00

地点：交通运输工程学院103

主讲人简介：

Dr. John E. Haddock is a professional engineer in Indiana and a professor of Civil Engineering at Purdue University where he also serves at the director of the Indiana Local Technical Assistance Program.

Prior to joining the Purdue faculty, Dr. Haddock worked in private industry as a materials engineer, as a senior research associate for the National Center for Asphalt Technology, as a research engineer for the Indiana Department of Transportation, and as a district engineer for the Asphalt Institute.

Dr. Haddock is a member of the American Society of Civil Engineers, ASTM International, the International Society for Asphalt Pavements, the Association of Asphalt Paving Technologists, and the American Road and Transportation Builders Association. He has also served on several committees for the Transportation Research Board and recently finished his six-year tenure as the chair of AFK30, Committee on the Characteristics of Non-asphalt Components of Asphalt Paving Mixtures. He also recently completed nine years of service as a member of the Federal Highway Administration’s Asphalt Mixture Expert Task Group.

主讲内容简介：

Field data collected in Indiana suggests that if asphalt mixtures were designed to be more compactable in the field, they could be compacted to a field density equivalent to the laboratory mixture design density, potentially increasing pavement durability. The objective of this research was to modify the mixture design in order to increase in-place mixture density without sacrificing permanent deformation characteristics. Three 100-gyration mixtures were used, each meeting applicable specifications and designed according to AASHTO M323. For each mixture, additional designs were completed using 30, 50, and 70 gyrations. Optimum binder content for these mixtures was chosen at five percent air voids, rather than four percent, and the effective binder content was held constant. Results indicate that the mixture produced using 30, 50, and 70 gyrations had equal or better permanent deformation characteristics than the original 100-gyration mixtures. A trial field project confirmed that mixtures designed at 5% air voids could be compacted to this level, showing that the approach is feasible from a construction viewpoint.

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