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This dissertation presents the findings of a literature review and information regarding selection, implementation and development of a chemical composition procedure for asphalt cements. The chemical composition analysis selected was the Corbett-Swarbrick procedure standarized as ASTM D4124. The procedure is a selective adsorption / desorption (solid / liquid) chromatography which separates asphalts in four distinct generic fractions. During the implementation of the Corbett-Swarbrick method, a number of refinements were made to improve its efficiency. These are presented in a comprehensive user manual as an appendix of this dissertation. The chemical procedure selected in conjunction with other rheological measurements of asphalt was used in a comprehensive study to characterize asphalt pavement material properties. Eight highway projects located throughout the State of Oregon were included in the present research. The highway projects were chosen to represent a wide variety of environmental and traffic conditions. Asphalt fractional composition was statistically related to asphalt theological properties and asphalt temperature susceptibility. Asphalt material properties were also included in the selection of prediction models and related to pavement performance. Fractional composition was also used for the evaluation of four different asphalt extraction / recovery procedures and the evaluation of a pressure oxygen bomb device, used for asphalt laboratory aging. The major findings of the research were: Fractional compositional analysis of asphalt showed that recovered asphalt may not represent the same characteristics of the actual asphalt present in the mix. Some rheological properties of asphalt showed good correlation to asphalt composition in the higher temperature range. At lower temperature, however, relationships were more scattered. Different temperature susceptibility parameters have different relationships with chemical fractional composition, and, do not correlate with each other. Different extraction / recovery procedures yield different chemical fractional composition for the same asphalt. Pavement performance statistically relates to groups of asphalt properties and asphalt mix properties.
This final report, in four volumes, of Strategic Highway Research Program (SHRP) Project A-002A describes intensive investigations of the chemical and physical properties of petroleum asphalts used in the construction of highway pavements. The model and predictive capability constitute the major portion of volume 1.
The chemical composition of asphalt cement will determine its quality, which in turn will ultimately influence the performance of bituminous roadways. This investigation was conducted to determine if the chemical composition of asphalts as measured by high pressure liquid chromatography (HPLC) could be used to determine the significant differences between asphalts from good and bad roads. If so, perhaps this method could be used in a predictive manner for improved asphalt specification requirements. HPLC analysis of asphalt cements from roadways which varied in quality from good to bad showed highly significant differences. Using these differences, these roadways were classified into good, fair, poor and bad. Coupling these data with the relative amounts of asphalt sub-fractions and physical tests such as penetration at 77 deg. F and ductility at 40 degree F, a reasonable explanation for why a given roadway had reduced performance was established. Using HPLC analysis and sub-fraction quantities, a qualified prediction on the asplalt quality used in two newly constructed roadways has been advanced.
Recent research on asphalt binder aging and rejuvenatorsKey data on asphalt performance and formulationsUpdates on tests and specificationsFully-searchable text on CD-ROM (included) This series volume comprises research papers and technical reports developed within the U.S.-based Association of Asphalt Paving Technologists. The book is divided into sessions focused on technology, specifications, cold recycling of RAP, and rejuvenators, with special emphasis on aging and on how rejuvenators are modeled, formulated and used to improve asphalt binders and prevent cracking. The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article. Search features on the CD-ROM can be by full text including all key words, article title, author name, and session title. The CD-ROM has Autorun feature for Windows 2000 with Service Pack 4 or higher products along with the program for Adobe Acrobat Reader with Search 11.0. One year of technical support is included with your purchase of this product.
Gel permeation chromatography (GPC), Corbett analysis, Heithaus test and other physical and chemical tests have been used to characterize asphalts and to relate chemical properties, physical properties and performance. The asphalts used in the present study consisted of periodic samples of virgin asphalt from various suppliers to Texas in the last two years, the test pavement asphalts in Dickens, Dumas and Lufkin, Texas from study 287, and a group of asphalts which had been rated according to tenderness.