On indices of temperature susceptibility of asphalt

In China, penetration index PI and equivalent softening point T₈₀₀ are utilized to evaluate the temperature susceptibility of asphalt. The penetration of four kinds of asphalt at five kinds of temperature is measured under two test conditions. PI and T₈₀₀ in four combinations of five kinds of temperature are obtained through regression, and their influenced factors are discussed.Moreover, T₈₀₀ and softening point are compared to G^*/sinδ, high thermal index in PG gradation of SHRP. According to recommendation of asphalt grade criterion in the Eighth Five year National Plan, high thermal grade of four kinds of asphalt is analyzed.