Alligator Cracking or Fatigue Cracking🐊

Alligator cracking, also known as crocodile cracking or fatigue cracking, is a common type of distress in asphalt pavement on roads. 

It is characterized by interconnected or interlaced cracking in the asphalt layer that resembles the hide of a crocodile or alligator. The cracks typically form cell-like patterns with sizes up to 300 mm (12 in) across, but usually less than 150 mm (5.9 in).

🔹Causes: 

-Sub-base failure

-Poor drainage

-Repeated overloading

🔹Development: 

-Starts as longitudinal cracks (parallel to traffic flow)

-Progresses to include transverse cracks

-Forms interconnected, sharp-sided, prismatic pieces

🔹 Severity levels:

-Initial: Thin, sparsely distributed cracks

-Advanced: Interconnected cracks forming distinct patterns

-Severe: May involve pumping of fines, spalling, loose pavement pieces, and potholes

✅Solution:

-Assess the Extent: Determine the severity of the cracking. For extensive damage, a full-depth patch may be necessary.

-Remove Damaged Asphalt: Excavate the affected area down to the base.

-Repair the Base: If the base is compromised, repair or replace it.

Apply New Asphalt: Lay new asphalt and compact it to match the existing surface.

Proper maintenance and timely intervention can help prevent further deterioration and ensure the longevity of the asphalt.