This paper presents an application of fracture mechanics to determine crack growth rates of the suggested anti-cracking overlay systems. Two different reinforcing methodologies are applied; 1: addition of chopped glass fibers to the HMA; 2: reinforcing asphalt overlay by glass grids. Asphalt mixture designing tests, three points bending tests and fatigue crack propagation tests were carried out. Fracture toughness K_(IC) is determined for plain and reinforced asphalt concretes. The crack growth rate is determined for each type of anti-cracking systems, the cracking process is analyzed. One of the significant points in this study is the attempt to give better understanding of the crack propagation for multilayer asphalt overlay. The results indicate that the reinforcing materials improve anti-cracking characteristics of the asphalt concrete and composite structure anti cracking overlay gives a good solution for reflective cracking phenomenon over old cracked pavements.
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