Resumen
Fatigue failure of any kind of material is of great concern while designing any component of Civil Engineering Structure. A fluctuating stress i.e. with positive and negative phase is the root cause of fatigue failure. Even controlling the peak amplitude stress, failure may take place due to fatigue, by initiating micro cracks due to fluctuating stress. This control in peak amplitude stress transform to number of cycle which material can take. Thus, there is existence of hypothesis that there exists stress amplitude below which it can take infinite number of load cycles; this limit is defined as endurance limit or fatigue endurance limit (FEL). Literature has records of bituminous concrete pavement which have been performing for 40 years without exhibiting any fatigue damage. It is the endurance limit of bituminous mixes, in these long lasting pavements which has controlled the damage due to fatigue. But still this concept is not fully established because establishment of endurance limit for different bituminous mixes itself is a challenging task reason being that many parameter and test methods control it. Different test methods like Four Point Bending Beam Test, Uniaxial tension test are followed in laboratory for establishment of endurance limits. Different test methods have their own test methodology and failure criteria. So depending upon, kind of available expertise/equipment the test method is selected, but mostly bending beam fatigue test method is adopted because of more control in data capturing and easy to analyze.