Report No.	CP16 (jot this number down to order)
Title	Performance Monitoring of Rubber Modified Asphalt Demonstration Projects
Authors	John Emery Geotechnical Engineering Limited
Publisher
Pub. Date	November, 1997
Pages	239
Keywords
Description	In 1996 and 1997, a program of detailed performance monitoring (consisting of visual inspections, distress surveys, deflection and frictional properties testing, and pavement profile measurements) of twelve rubber-modified asphalt (RMA) pavement projects completed in Ontario was conducted by John Emery Geotechnical Engineering Limited, Consulting Engineers (JEGEL) on behalf of the Ontario Ministry of Environment (MOE). Visual inspections only were completed for an additional twelve projects that were constructed in 1993. The purpose of this performance monitoring was to assess the Ontario RMA projects and compare their performance with conventional pavements and each other to determine the performance benefits attributable to the various RMA technologies, and provide recommendations for future RMA pavements in Ontario. While it is still relatively early in the life of the RMA demonstration sites, it is clear that 'dry process' RMA sections are deteriorating at a faster rate that conventional asphalt pavements and 'wet process' asphalt rubber (AR) sections. Recent 'moist process' RMA trials constructed using finer crumb rubber modifier are performing better than the dry process sections and comparably to conventional pavement. Terminal blend AR sections are performing similar to or slightly better than conventional pavements. All of the RMA processes appear, at this relatively early point in the pavement life, to be significantly more costly than conventional pavements; extension of the current monitoring program will assist in substantiating the relative performance benefits for RMA life cycle costing.
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