Softening and local self-heating of bituminous mixtures during cyclic loading

Three-Dimensional Linear Viscoelastic Properties of Two Bituminous Mixtures Made with the Same Binder

“…To observe linear behavior, the axial strain amplitude was lower than 10 −4 m=m (Perraton et al 2016;Di Benedetto et al 2001;Airey et al 2003;Nguyen et al 2015b;Graziani et al 2014;Godenzoni et al 2017). In addition to avoid biasing effects such as transient effects (Nguyen et al 2015a;Gayte et al 2016), self-heating, and thixotropy (Mangiafico et al 2015;Babadopulos et al 2017;Riahi et al 2017) few cycles were applied for each frequency.…”

“…The sinusoidal axial strain (average of the three extensometers) was used to monitor the amplitude of axial strain during cyclic loading. To limit any bias that could exist for this type of test (e.g., heating due to viscous dissipation, thixotropy, and so on) (Di Benedetto et al 2011;Nguyen et al 2012;Mangiafico et al 2015;Babadopulos et al 2017), fewer than 100 cycles were applied at each testing frequency. The data acquisition and the analysis procedure were detailed by Perraton et al (2016).…”

Application of Miller yield criterion to develop a unified fatigue law of asphalt mixture for different loading modes

“…The first one is that there is a fundamental difference between tests such as UT/UC and IDT or 3PB: While uniaxial loading in cylinders or prisms generates homogeneous states of stress that are directly interpretable in terms of stress and strain distributions, the other tests need the solution of a structural problem to assess stress/strain states, which are only valid at the beginning of the tests. The second one is that many phenomena such as physical nonlinearity, self‐heating, and thixotropy may bias any fatigue interpretation method due to the fact that they happen with great implication in lab fatigue life results (where continuous loading is applied) and probably are minor in the field (where the load is intermittent) 21–24 . Specifically, Poulikakos et al compared the fatigue performance of an aged asphalt mixture under two‐point and four‐point bending modes 25 .…”

“…The second one is that many phenomena such as physical nonlinearity, self-heating, and thixotropy may bias any fatigue interpretation method due to the fact that they happen with great implication in lab fatigue life results (where continuous loading is applied) and probably are minor in the field (where the load is intermittent). [21][22][23][24] Specifically, Poulikakos et al compared the fatigue performance of an aged asphalt mixture under two-point and four-point bending modes. 25 They found that the slopes of fatigue lines obtained under the two modes are different from each other.…”