Resilient and Tensile Properties of New York State Asphalt Concrete Mixes

摘要

Due to growing interest nationwide and in New York, a two-phase laboratory program was undertaken to measure resilient and tensile properties of New York's top-course Mix Types 6F and 7F. Resilient modulus was measured on 28 asphalt concrete mixes at 40, 77, and 100 F using repeated-load indirect-tension test equipment according to ASTM D 4123-82 procedures. Indirect tensile strength and stiffness were measured with static tensile strength equipment at speeds of 2 in. per minute at 77 F only. Test properties of the 28 mixes are summarized in the report. Resilient modulus differences were found to be insignificant for 6F and 7F mixes and between crushed stone and gravel at 40 and 77 F. Significant differences were found, however, between mix and aggregate types at 100 F. Differences in tensile strength and stiffness were found to be significant for mix and aggregate types. Measured resilient modulus and stiffness compared poorly to the modulus predicted using McLeod's method and the Asphalt Istitute equation. Regression techniques used to relate structural properties to mix formulation factors are described. Structural layer coefficients obtained from resilient modulus were found to be sensitive in terms of pavement service lives based on the AASHTO design equation.