Comparison of various testing methods for low-temperature properties of asphalts

The Moriyoshi Breaking Point (MBP) test, Fraass Breaking Point (FBP) test, and conventional tests, i.e., performance-related grade tests developed by Strategic Highway Research Program, were conducted on asphalt of various ages at low temperatures, and the Thermal Stress Restrained Specimen Test on asphalt mixtures. A field investigation on relationships between the MBP of asphalt residuals aged by the High Temperature Long Time Durability test and pavement-cracking temperatures was performed. The MBP and/or FBP of asphalt cements were correlated strongly with the temperature at limiting stiffness. An especially strong correlation was found for asphalt in the tank state. The relationship between the rate of strain and brittle point of asphalt and/or mixture was linear based on the results obtained from various tests.