![]() ![]() Place an HMA overlay over the entire pavement surface. Large fatigue cracked areas indicative of general structural failure.Remove the cracked pavement area then dig out and replace the area of poor subgrade and improve the drainage of that area if necessary. Small, localized fatigue cracking indicative of a loss of subgrade support.Fatigue crack repair generally falls into one of two categories: Once the characteristic alligator pattern is apparent, repair by crack sealing is generally ineffective. Any investigation should involve digging a pit or coring the pavement to determine the pavement’s structural makeup as well as determining whether or not subsurface moisture is a contributing factor. Repair: A fatigue cracked pavement should be investigated to determine the root cause of failure. Poor construction (i.e., inadequate compaction).Inadequate structural design (i.e., the pavement was designed too thin for the anticipated loads).Increase in loading (i.e., the pavement is being loaded more heavily than anticipated in design).The stripped depth contributes little to pavement strength so the effective HMA thickness decreases. Stripping on the bottom of the HMA layer.Water under a pavement will generally cause the underlying materials to become weak. Probably the most common reason is a loss of base, subbase or subgrade support from poor drainage.Decrease in pavement load supporting characteristics.Possible Causes: Inadequate structural support for the given loading, which can be caused by a myriad of things. Problem: Roughness, indicator of structural failure, cracks allow moisture infiltration into the base and subgrade, eventually results in potholes and pavement disintegration if not treated. After repeated loading, these longitudinal cracks connect forming many-sided sharp-angled pieces that develop into a pattern resembling the back of an alligator or crocodile. As the number and magnitude of loads becomes too great, longitudinal cracks begin to form (usually in the wheelpaths). Severe alligator cracking in a major Honolulu intersection.ĭescription: A series of interconnected cracks caused by fatigue failure of the HMA surface under repeated traffic loading. Severe alligator cracking near the stop line at a major arterial intersection. Please contact your state DOT or Pavement Association for assistance. There are always exceptions to the rule – the exact condition you are looking for may not be here. Index of Pavement Distressĭistressed pavement is often a result of a combination of factors, rather than just one root cause. Photos of each type of distress are accompanied by a description of the distress, the reason it is a problem, some of the most likely causes and basic repair strategy. ![]() If you are looking for a specific type, scroll down and look at the thumbnails to see which picture most closely matches the condition you are investigating. This section is organized alphabetically by type of surface distress. Provide some basic guidance into what kinds of conditions might lead to certain surface distresses.Provide some insight into why particular surface distresses are problematic.HMA pavement damage that is visible at the surface of the pavement is often called “surface distress”. Assist in identifying basic HMA pavement damage.However, like all pavements, HMA pavements can be damaged by certain conditions. Properly designed and maintained HMA pavements can provide many years of satisfactory service. ![]()
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