Asphalt concrete properties and performance in Alaska : executive summary

48812320757558PDFResearch PaperFHWA-AK-RD-82-02AAsphalt concretePavement performanceProperties of materialsAlaskaAlaska. Dept. of Transportation and Public FacilitiesMcHattie, RLUnited States. Federal Highway AdministrationNTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATIONNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceUS Transportation CollectionA major study of asphalt concrete properties and performance of Alaska's highways was completed in 1982. The project data base was obtained from 117 statewide pavement sections through numerous core samples and measurements of cracking, patching and rutting. Primary research objectives were to: 1) provide an idea of the in-service composition of asphalt concrete, and 2) determine composition variations which produce the best performance. Because of the apparent rapidity of asphalt age hardening, performance relationships were derived using aged properties. Results indicate that best long-term performance is obtained from asphaltic materials which retain softness and relatively low tensile strengths throughout the pavement's service life. Aged materials specifications are presented which have provided optimum performance