Effect of temperature on fatigue life of asphalt mixture Hossein Asadi 1 , Colin Leek 2 , Hamid Nikraz 3 Abstract Fatigue failure of asphalt or other bound layers is one of the most fundamental flexible pavement deteriorations and results from induced strain from repetitive traffic movements. Extensive study has been undertaken by many researchers to estimate the fatigue life of pavement for Mechanistic- Empirical design procedure. However many practitioners report that the fatigue transfer function currently prescribed in the Austroads method does not fit with observed performance. Hence developing an appropriate model for asphalt behaviour is of great importance. For this reason in depth testing has been performed at Curtin University Geotechnical Lab using the 4 Point Bending Beam Test to compare the fatigue life of samples of a control asphalt mix at a range of temperatures and frequencies. This paper outlines the effect of temperature on fatigue performance of pavement. A methodology to develop a shift factor to convert the laboratory results to better replicate the field condition is proposed. Keywords: Fatigue, 4 Point Bending Beam, Temperature, Shift Factor Introduction The two fundamental types of deterioration in asphalt pavements are fatigue cracking evidenced as crocodile cracking and shear failure evidenced as rutting, also known as permanent deformation. Fatigue cracking is one of the pavement failure modes that have been investigated by many researchers. One of the most well-known tests to investigate laboratory fatigue performance is the four point bending beam apparatus. Generally there are two types of the test modes for four point bending beam tests, constant stress and constant strain. Twelve tests have been performed at Curtin University Geotechnical Laboratory using the EN standard tester provided by IPC Global. Generally tests continued for 2 million cycles or the number of cycles to 40 percent of initial flexural stiffness, noting that the fatigue life of beams is determined as the number of cycles to achieve 50 percent of the initial stiffness. Background The allowable number of repetitions to reach the fatigue life of a material can be related to either level of strain or stress and the sample flexural modulus. The simplified equation generally adopted for allowable load repetition is of the form given in equation 1 and 2:   =   (    )   (1)   =   (    )   (2) Where   = Number of allowable repetition 1 PhD candidate, Curtin University, Civil Engineering Department, hossein.asadi@curtin.edu.au 2 Lecturer, Curtin University, Civil Engineering Department, C.Leek@curtin.edu.au 3 Professor and Head of Department, Curtin University, Civil Engineering Department, H.Nikraz@curtin.edu.au