Analysis on the Rigid-Flexible Composite Base of Asphalt Pavement of an Expressway in Guangdong

The typical structures of frequently used semi rigid base, asphalt treated macadam laying on semi-rigid base and graded broken stone laying on semi-rigid base in Guangzhou-Heyuan Expressway were analyzed on structural stress. Comparative analyses on the load response characters with asphalt pavement structure layers with different base were carried out. Combined effects of gradation, modulus, and thickness of Asphalt treated macadam layer with field investigation of composite base, design schemes of asphalt pavement with rigid-flexible composite base were proposed for expressway in Guangdong.