Study On The Design Method And The Pavement Performance Of Asphalt Treated Base Course Mixture

Asphalt treated base(for short ATB), different from semi-rigid base which is often used in our country, belongs to the category of flexible base. ATB has great shearing strength and good capability of fatigue resistance, and can control and reduce reflecting crack. Using ATB is economical and can bring fine pavement performances. ATB is widely used abroad, but seldom used at home. The study on ATB has just started in our country.Based on consulting a large number of domestic and foreign documents concerning this subject, the paper proposes several gradations of ATB mixture, and determines the optimum asphalt-aggregate ratio through the mechanics index method which is complemented with marshall test of 6-inch diameter specimen. The paper also study the pavement performances of ATB mixture, which include mechanical properties, high-temperature stability, low-temperature anti-cracking performance and fatigue resistance. Finally, the paper study the v ibratory molding method of ATB mixture, and find out the optimum combination of vibratory parameters, and compare the mechanical properties of mixture under vibratory compaction and marshall compaction.