Fatigue Cracking in Bituminous Mixture Using Four Point Bending Test

摘要: This paper describes investigation into cracking in bituminous mixture using the four point bending notched fracture (FPBNF) test, which has been developed at University of Lyon/ Ecole Nationale de Travaux Publics l’Etat (ENTPE). A special loading path is applied on beam specimen a constant temperature - 4.5°C. monotonic was first until peak load and after unloading, many loading/unloading cycles small amplitude were carried out final failure specimen. Deflection crack mouth opening displacement (CMOD) are measured. Crack length determined experimentally propagation gauges. It also obtained with an improved method, called Displacement Ratio (DRCL) ENTPE laboratory, allows back calculating length. method based relation between two experimental measurements: deflection beam. The results from this discussed compared measured During behaviour investigated. studied as function cycle number. stress intensity factor evaluated. Two different domains evolution distinguished: domain where pre-existing progressively re-opens, second propagates. Paris fatigue law could be