Evaluation of Fatigue (Alligator) Cracking in the LTPP SPS-6 Experiment

Evaluation of Crack, Seat, and Overlay (CS&O) pavement section performance is done in terms of fatigue cracking (also known as alligator cracks). Two categories based on weather region (namely Wet-with-Freeze (WF) and Wet-with-No-Freeze (WNF)) were used to divide data extracted from the Long Term Pavement performance (LTPP) SPS-6 experiment. Regression models were developed after these data were analyzed. California pavement section data were evaluated separately, leading to a third regression model's development. Alligator crack minimization in sections with unbound bases did not appear to be helped by thicker overlays in the WF region. In the WF region, sections with unbound bases were outperformed by sections with bound bases. In the California sections, alligator crack reduction was assisted by increasing the leveling course thickness from about 30.5 to 63.5mm. It is suggested by regression analyses that WNF region sections will outperform counterparts in California and the WF region up to an age of approximately 12 years. After 10 years of service, it is expected that the California sections will exhibit approximately 56% alligator cracks.

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  • Authors:
    • Rahim, A M
    • Fiegel, G
    • Ghuzlan, K
  • Publication Date: 2009-1


  • English

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  • Accession Number: 01140900
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 21 2009 6:20PM