Survey on the Formation Top-down Crack 

Jianfeng ZHENG 

Institute of Civil Engineering and Construction, Chongqing Jiaotong University, Chongqing, 400074, CHINA 

Abstract: This paper mainly from the flexible asphalt pavement how to generate top-down cracking (selforiented development of cracks and damage of pavement cracks in this the problem started, combined with domestic and foreign experts on top-down cracking produced the mechanism study of contrast, by of asphalt mixture and asphalt pavement forming mechanics analysis, based on asphalt mixture of top-down crack of asphalt pavement were analyzed, the main consideration of aggregate ratio, asphalt pavement aging degree, grade three main factors, by using orthogonal experiments respectively on three main factors make produce top-down crack this problem analysis. The stress intensity factor K is used to analyze the mechanical stress of the asphalt pavement which is produced by the combination of the first type of fracture and the second type crack ｏｒ the two crack. At last, this paper tries to give prevention and improvement suggestions for the analysis of asphalt mixture and asphalt pavement. 

Keywords: Top-Down crack; Asphalt mixture; Fracture mechanics; Aging of asphalt pavement