Experiment of Tension-compression Fatigue and Damage for Asphalt Mixtures

Abstract

A tension-compression beam fatigue test under continuous sine wave alternating loading for AC-13 was conducted to understand fatigue damage characteristics of an actual asphalt pavement structure under tension and compression stresses. Ten sion-compression fatigue damage characteristics of asphalt mixtures were investigated using phenomenology based on basic theory of damage mechanics. Tension-compression fatigue test method and influencing factors were introduced; and tension-compres sion fatigue equation was established via fatigue test results. A tension-compression fatigue damage model was developed based on the damage variable defined by elastic modulus. Damage parameters were determined by fitting fatigue test data. Tension compression fatigue damage evolution equation regarding stress level was constructed. Results show the following. (1) Fatigue damage parameters 0' and f3 increase with stress level; and relationship between damage parameters and stress level is linear.(2) Tension-compression fatigue damage evolution has approximately three stages: damage initiation, stable growth, and unsta ble failure. (3) The greater the nominal stress level is, the lower the curve of the damage evolution curve is, and the less fa tigue damage evolution speed varies with life radio.

Concept and Development of an Accelerated Repeated Rolling Wheel Load Simulator (ARROWS) for Fatigue Performance Characterization of Asphalt Mixture

“…The maximum axial stress and corresponding strain at the sample end increase sharply with the increase in load eccentricity. The proper experimental setup is necessary for avoiding eccentric tension [52,53]. Therefore, both TCFT and DTFT require test samples to have a firm connection to the test system.…”

Numerical Analysis of a New Test Method for Evaluating the Mechanics Characteristics of Steel Deck Pavement

“…Now it is widely accepted that maximum tensile stress (strain) on the top of deck pavement, maximum interface shear stress of steel deck pavement and maximum deflection of U rib, are considered as major designing parameters for steel deck pavement [8]. Also, the first designing parameter is proposed for fatigue cracks, which is major distress in the field.…”

“…Although composite beam is widely recommended to evaluate the fatigue performance of HMA in the steel deck pavement, there is no research on FE model of composite beam comparing with local steel deck pavement. According to different kinds of HMA materials, steel deck and load pressure, previous research [1][2]8] have shown that maximum tensile stress (strain) usually are 0.3Mpa-0.9Mpa and 300uԐ-600uԐ, respectively, which are much larger than normal asphalt pavement.…”

Laboratory and field study of fatigue cracking prediction in asphalt pavements.

“…The bottom of the surface layer is primarily under pressure when the vehicle wheel is close to a given point of the pavement; the bottom of the layer is under tension when vehicle crosses the given point; and then, it is under pressure once again when the vehicle leaves. By the end, the pavement structure is under tensile and compressive stresses (Qian et al, 2013). The test consists in applying a tension-compression sinusoidal loading in a cylindrical asphalt mix sample at 10Hz of frequency at different temperatures.…”