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Consideration of TDC in pavement design methods is . have proven a promising tool to assess flexible . The time required for the cracks to appear has been. . Taiwan Abstract Top-down cracks (TDC) initiate at the pavement surface and propagate downwards. They have been observed with increasing frequency in . 1 INTRODUCTION Top-down cracking (TDC) has been recognized as a . the globe have acknowledged the prevalence of TDC and the necessity of finding a . However, many recent studies and field experiences have shown that fatigue . (1987) conducted a study of top-down cracking (TDC) on HMA pavements in the . (2002) conducted a field investigation on areas with TDC. . gradients along the depth of the pavement have also been linked to top-down cracking (Roque et al. cracking. A. Nikolaides & E. Manthos Aristotle University of Thessaloniki, Thessaloniki, Greece ABSTRACT: Top-Down Cracking (TDC) is a pavement distress . 2010) have also gies determine pavement fatigue life considering the reported . Another opinion of surface cracking was that TDC was caused by the shear . and Roque have shifted their research focuses to the shear cracking mechanism . Several studies have been carried out in order to mainly identify the causes of top down cracking and explain how the phenomenon is propagating. In particular . (2002) conducted a field investigation on areas with TDC. They concluded that . of. Top-Down. Cracking. (TDC). propagation. in. asphalt. concrete. pavements . At the Minnesota road research facility, Mn/ROAD, longitudinal cracks have .