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Asphalt cement chip seals in Oregon : construction report
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    Most chip seals in Oregon have been constructed using an emulsified asphalt binder. However, chip seals using an asphalt cement (hot oil) binder have been tried in limited situations in Oregon. This report includes a literature review and summarizes the construction and short term performance of asphalt cement chip seals constructed during the summer of 1999 in Lane, Clackamas, Lincoln and Deschutes Counties. The hot oil, supplied by Wright Asphalt, was AC-15-5TR which includes 5% tire rubber and 2.5 to 3.0% SBS polymer. Previous research on asphalt cement chip seals has been done in Texas. Freeman and Rmeili studied six types of maintenance treatments, including asphalt cement chip seals, on 20 test sites. They found that all chip seal treatments including asphalt cement, reduced alligator, transverse and longitudinal cracking. Gransberg and others documented the Texas Department of Transportation chip seal construction program including asphalt cement chip seals. They noted that asphalt cement chip seals are advantageous because "the roadway can be opened for traffic early." The Oregon Department of Transportation (ODOT) evaluated construction of asphalt cement chip seals constructed on OR Route 126, U.S. Route 101, four Clackamas County roads, and one Deschutes County road. The chip seals were applied using conventional construction techniques. Asphalt cement, pavement, air temperature and humidity measurements were recorded throughout construction operations. Samples of aggregate and asphalt cement were taken for laboratory analysis. Additionally, skid resistance testing was conducted on OR Route 126 and U.S. Route 101. The chip seals were monitored for chip retention and condition, one month after construction. Localized chip loss was observed on OR Route 126 between MP 29.0 and MP 31.6 in April 2000. Chip loss was attributed to variability in the underlying pavement surface and the low asphalt cement shot rate used during construction. Each chip seal section will be monitored annually for two years, and a final report prepared at the end of the monitoring period.
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