n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Development of the third-point loading fatigue and fatigue curves for LAMBS : technical paper




Fatigue failure of an asphalt layer is one of the primary structural distress modes found in flexible pavements, resulting from the repeated application of traffic-induced stresses. It is often exhibited as 'crocodile' cracking on the road surface. Various laboratory fatigue testing methods are used to characterize the fatigue performance of asphalt mixtures, but a more advanced method has been developed and the application to large aggregate mixes for bases (LAMBS) is discussed. The third-point loading fatigue testing method, specially modified, was incorporated. This fatigue testing system was used to determine the fatigue performance of a LAMBS mixture containing a nominal aggregate size of 37,5 mm. The LAMBS mixture was found to have a superior fatigue performance compared with a conventional continuously graded mixture with a 19 mm nominal aggregate size.


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