Performance Comparison of PG 64-22 versus PG 64-28 Asphalt in Hot Mix Asphalt Placed in Connecticut.

摘要

This research was conducted to determine if switching from a low-temperature asphalt performance grade (PG) of -28DGC to -22DGC would be detrimental to the performance of Hot Mix Asphalt (HMA) pavements in Connecticut. Test sections were placed on two different resurfacing projects in CT in 2006, employing both PG 64-22 and PG 64-28 asphalt binders. Field tests and performance observations along with laboratory analysis and tests were used to determine the feasibility of increasing the cold temperature PG grade. The analysis was conducted utilizing several different methods, including field visits, photolog analysis, International Roughness Index (IRI) analysis, rutting analysis, cracking and distress analysis. Laboratory analyses included Asphalt Pavement Analyzer (APA) rut testing, tensile strength ratios, critical cracking temperature, PG grading and relaxation modulus. Results of all analysis and testing are not conclusive enough to make definitive statements regarding the use of PG 64-22 as compared with PG 64-