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This is a documentation of the results of a literature review to collect, summarize and analyze information which relates to asphalt properties (chemical and physical) to pavement performance. The report consists of 5 chapters. The review attempts to determine those properties of asphalt cement and asphalt concrete mixes which can significantly influence pavement performance with an emphasis on asphalt cement properties.
Pavement cracking and related distress are the major problem with Utah highways. This study was initiated to isolate the causes and propose solutions to this problem. The most significant factor influencing transverse cracking was found to be the source of asphalt crude. This difference in asphalt performance was found to be related to the parameters temperature susceptibility, Force Ductility, ductility, aging index, chemical composition, and cannon cone viscosity. The viscosity and penetration grading methods were found to be inadequate in controlling pavement cracking. The longitudinal cracking was related to accumulated 18-kip loads, temperature susceptibility, and percent asphalt. Map cracking was significantly defined in terms of accumulated 18-kip loads, temperature susceptibility, and pavement age. The high level of air voids content (7.1%) was found to cause a more rapid hardening of the asphalt binder than the low level of air voids (2.6%). Asphalt hardening in the Rolling Thin Film Circulating Oven was found to not be representative of the field aging of the asphalts.
The goal of this literature review on asphalt modifiers was to better understand the effects of modifiers on the performance of in-service pavements. The scope of the review was to collect and summarize information in the technical literature relating modified asphalt properties to field pavement performance; to report the original findings and conclusions of the authors; and to note any trends or consensus. The resources reviewed included: published literature, state highway agency research reports, inquiries to associations and manufacturers, and a National Technical Information Service on-line computerized database search. Based on this review, it may be concluded that (a) asphalt modifiers do influence binder and mixture properties and, hence, performance and (b) the ability to accurately interpret the association between asphalt modifiers and pavement performance has not yet been established through field studies.