Appendix A Pavement Distress Types and Causes

Appendix APavement Distress Types and CausesThis Appendix provides descriptions of the Types and Causes of the distresses that occur inasphalt, concrete, and asphalt-overlaid concrete pavements, and asphalt and concreteshoulders. Many of the photos used in this Appendix are from the LTPPD istress Pavement DistressesFatigue (Alligator) CrackingFatigue (also called alligator) cracking, which is caused by fatigue damage, is the principalstructural Distress which occurs in asphalt pavements with granular and weakly stabilizedbases. Alligator cracking first appears as parallel longitudinal cracks in the wheelpaths, andprogresses into a network of interconnecting cracks resembling chicken wire or the skin of analligator. Alligator cracking may progress further, particularly in areas where the support isweakest, to localized failures and A-1. Fatigue (alligator) cracking in asphalt which influence the development of alligator cracking are the number and magnitude ofapplied loads, the structural design of the Pavement (layer materials and thicknesses), thequality and uniformity of foundation support, the consistency of the asphalt cement, the asphaltcontent, the air voids and aggregate characeristics of the asphalt concrete mix, and the climateof the site ( , the seasonal range and distribution of temperatures).

Appendix A Pavement Distress Types and Causes This Appendix provides descriptions of the types and causes of the distresses that occur in asphalt, concrete, and asphalt-overlaid concrete pavements, and asphalt and concrete

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