A new asphalt mixture suitable for use in cold regions was designed. The stress-strain curves for the matrix asphalt, asphalt mastic, body of the asphalt, and fine aggregate at low temperatures were obtained with a bending test.The low-temperature anti-cracking property of the binding materials above could be evaluated by the index of flexural strain energy density. A rubber powder of different specifications was blended and the gradation was made to be identical with AC-13. Fifty percent of the conventional fine aggregate was replaced by rubber powder and a new asphalt mixture was designed. The pavement performance of the new asphalt mixture in cold regions was evaluated by a wheel rutting test, bending test, and freeze-thaw splitting test. The results show that the prime reason for cracking in the mixture was due to the poor anti-cracking properties of the body of the asphalt and fine aggregate. The pavement performance of the asphalt mixture improved significantly after substituting some gradation rubber powder for the fine aggregate. The low-temperature anti-cracking property and water stability of the asphalt mixture improved, but the high temperature stability of asphalt mixture decreased slightly. The results establish the theoretical foundation for the design and construction of asphalt pavements in cold regions.
high performance asphalt mixture