This report presents the results of an evaluation of laboratory mix design methods using Hveem and Marshall equipment for emulsified asphalt paving mixtures to determine if the design methods are adequate for selecting optimum asphalt emulsion and water contents for actual paving projects. It was found that neither of the methods (known as the University of Illinois method and The Asphalt Institute method) is totally satisfactory for selecting optimum asphalt and water contents and that there is a lack of compatibility between the results from the two methods. The results of a field study involving construction practices such as mixing, placement, and compaction of the emulsified asphalt mixtures are more critical than the initially selected or target asphalt emulsion contents determined from the laboratory mix design methods. Although only partially successful in terms of accomplishment of the objective of arriving at a proven laboratory mix design method, the report will be of interest and value to highway agency personnel involved in research, design, and construction of pavements using emulsified asphalts, particularly with regard to suggestions for modifying existing mix design methods. (Author).
Samenvatting