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Aggregate loss in asphalt surface treatments has been a major problem in Alaska. A study completed in 1982 entitled "Performance of Bituminous Surface Treatments" recommended specification changes. Most important of these was the adoption of the McLeod design method and limiting the construction season. The project reviewed these recommendations by constructing test sections. The McLeod design method provides an excellant starting point for asphalt and aggregate spread rates. It is further recommended that the percent passing the No. 200 sieve be reduced to 0.5 percent. A survey of seal coating practices and philosophies was also made. Most states feel that surface sealing is economically desirable. Maintenance funds are normally used.
This research report presents recommended emulsion performance grade (EPG) specifications for asphalt emulsions used in three pavement preservation surface treatments (PSTs): chip seal, microsurfacing, and spray seals. These EPG specifications are climate-driven and applicable to traffic loads that are anticipated during the service life of each PST. The report also presents recommended test protocols for evaluating some of the properties of binders for which test methods are not readily available. The information contained in the report will guide materials and maintenance engineers in evaluating, selecting, and specifying the binders for use in PSTs that will provide acceptable performance and service life. The information contained in the report will be of immediate interest to materials and maintenance engineers and others involved in specifying and evaluating materials intended for use in PSTs.