Field Evaluation of Pavement Preservation Treatments Incorporating Stress Absorbing Membrane Interlayer Technologies

摘要

In 2011, the County of Lanark constructed a series of pavement preservation treatments along a 4.7 km section of Scotchline Road in Perth, Ontario. Unlike traditional practice however, three different Stress-Absorbing Membrane Interlayer (SAMI) technologies were placed upon the pavement surface and covered with micro-surfacing. SAMI treatments placed under Hot Mix Asphalt (HMA) have been used in the past to retard reflective cracking, however the use of SAMI technology with thin preservation treatments may provide additional benefit as compared to un-reinforced systems. The SAMI technologies included ⅰ) fibre-reinforced micro-surfacing, ⅱ) fabric-reinforced chip seal, and ⅲ) Fibremat, while a control section received two layers of un-reinforced micro-surfacing. The purpose of the experiment was to directly compare the performance of each individual treatment over time from a preservation perspective, as well as to determine whether any of the treatments provide cost-effective retardation/prevention of reflective cracking from the underlying pavement. After three years in service, significant differences in performance have been observed. This paper discusses the SAMI treatment technologies, observed performance, and the overall cost effectiveness under the conditions of the experiment. Recommendations are also provided to guide agencies wishing to incorporate SAMI technologies into their pavement preservation program.