Asphalt Review - Volume 32 Number 3 (Jun / Juy 12) - Australian ...

ASPHALT REVIEWFigure 2. Pavement Response Under Trafficthickness were noted and adjusted for duringdata analysis. Each section was placed on thesame 6-inch aggregate base and subgradefoundation. Additionally, gauges wereinstalled in each section during constructionto measure pavement response under trafficthroughout the two-year experiment.Testing and EvaluationConstruction was completed and thesections were opened to traffic on August28, 2009. A fleet of five triple-trailervehicles circled the Test Track 16 hours aday, five days a week for a two-year periodto accumulate approximately 10 millionstandard axle loads. During this time,extensive monitoring using the embeddedgauges, pavement deflection testing, andperformance monitoring were conducted.Additionally, extensive laboratory testing oneach material was conducted to evaluatemechanistic properties and performancecharacteristics.Pavement ResponseUnder TrafficWeekly pavement response measurementswere made to determine how much thepavement was deforming under the appliedtraffic. Figure 2 shows the measured tensilestrain in the bottom lift of each section versusmeasured mid-depth temperature. Thecontrol section clearly flexed more than eitherof the RAP sections.Though the RAP-WMA fitted curve is slightlyhigher than the RAP-HMA curve, they werenot found to be statistically different so theirresponse could be considered about the same.The differences in the RAP sections comparedto the control were much greater at warmertemperatures than cooler. For example, therewas approximately a 30% reduction in strainlevel at 110°F when switching from the controlThe Road toInnovationEver increasing truck traffic, extreme climatesand the continuous need for maintenanceand growth-based construction pressure roadbudgets around the world every day.Our wide range of polymer-based solutions notonly deliver improved durability and resistanceto rutting and cracking, but also offer flexibilityto overcome the most challenging sources ofbitumen.For all your paving needs, Kraton Polymersis your single source for highly innovativesolutions, service and support.Delivering solutionsto your toughest challengesis what we do best.For more information, call+ 1-800-4-KRATONOr visit our website atwww.pavewithkraton.com