METHOD TO ASSESS FATIGUE OF ASPHALT CONCRETE UNDER CYCLIC DYNAMIC LOADS

摘要

FIELD: test equipment.;SUBSTANCE: smallest size of a cross section of a sample made in the form of a bar makes at least three sizes of the largest fraction of the filler. The sample is rested against an elastic base that models the underlying layer of the road surface, and two supports at the ends of the sample. The sample is loaded with cyclic load by zero-to-tension stress cycle corresponding to the frequency range of 2-30 Hz and level of loading 0.3-200 kgf, with separate fixation of loading frequency and level of force action at a sample of asphalt concrete. In process of tests they ensure permanent contact of the sample and the elastic base, simultaneously, sample sagging is measured, its bending, stretching deformations and deformations of the elastic base are measured, afterwards they determine the module of elasticity, the coefficient of elastic base bed, the area of hysteresis loop in coordinates as, the density of internal energy depending on the number of deformation cycles up to sample damage.;EFFECT: increased validity of assessment of parameters of strength fatigue of asphalt concrete under cyclic dynamic actions.;3 dwg