Fatigue performance evaluation of modified asphalt binder using of dissipated energy approach

Ameri, Mahmoud; Seif, Mohammadreza; Abbasi, Massoumeh; Molayem, Mohammad; KhavandiKhiavi, Alireza

doi:10.1016/j.conbuildmat.2017.01.010

Cited by 23 publications

(9 citation statements)

References 9 publications

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“…3b). However, several researchers published their work employing a cylindrical specimen shape for fatigue testing of pure binder or mastic [14,16,18,20,[22][23][24][25][28][29][30][31][32]. Some researchers came to the same conclusion regarding the disadvantageous use of a cylindrical specimen shape for fatigue testing [15,21].…”

Section: Test Parameters and Sample Geometrymentioning

confidence: 93%

Introducing a new specimen shape to assess the fatigue performance of asphalt mastic by dynamic shear rheometer testing

2018

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Early failure of asphalt pavements is a common issue all around the world. Damages are caused by various reasons like insufficient binder or aggregate quality, an inadequate mix design or improper handling in the production/construction process. The effects of binder, aggregates and mix design have been widely studied and state-of-the-art testing methods are available for both, hot-mix asphalt (HMA) and for each component. An important part in HMA belongs to the asphalt mastic, where no standardized method is available to allow a quality control. Asphalt mastic is the mix of bitumen with aggregates smaller than 63 (125) lm and covers the coarse aggregates as the actual binding component in the mix. This research aims at developing a testing method for asphalt mastic based on fatigue tests. The dynamic shear rheometer (DSR) was found as a suitable device for this purpose. The DSR fatigue test consists of the 8 mm parallel-plate geometry widely used for binder performance grading with a sample height of 3 mm. Instead of a cylindrical specimen shape, a hyperboloid of one sheet is applied. This shape predetermines the point of failure and prevents adhesion/interface failures between the mastic specimen and the upper or lower DSR stainless steel plate.The specimens are prepared directly in the DSR employing a silicone mould to ensure an exact specimen shape. This test can be applied to all DSR devices without costly changes or additional equipment as long as sufficient cooling capacity and torque can be provided from the DSR. This fatigue test makes it possible to assess the fatigue performance of binders and mastic samples.

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Section: Test Parameters and Sample Geometrymentioning

confidence: 93%

Introducing a new specimen shape to assess the fatigue performance of asphalt mastic by dynamic shear rheometer testing

2018

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“…N before is the fatigue life of the asphalt binder before healing, and N after is the fatigue life of the asphalt binder after healing. HI 3 is the ratio of dissipated energy (DE) before and after rest, which can also indicate the healing capacity of the asphalt binder. , In eq , DE i is the dissipated energy by the i th loading cycle, and ε i , δ i , and G i * are the strain, phase angle, and complex shear modulus under the i th loading cycle, respectively. W before and W after are the accumulative dissipated energy before and after rest, respectively.…”

Section: Experimental Sectionmentioning

confidence: 99%

Enhanced Self-Healing Process of Sustainable Asphalt Materials Containing Microcapsules

Sun

Pang

Zhu

et al. 2017

ACS Sustainable Chem. Eng.

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Asphalt is a typical self-healing material, but the healing process is rather inefficient. Therefore, melamine–urea–formaldehyde (MUF) microcapsules containing rejuvenator were fabricated to enhance the self-healing ability of asphalt. Optical and scanning electronic microscopy (SEM) morphologies showed that the prepared microcapsules were intact, and the outer surface of the microcapsule was rough, with both observations were beneficial for the interaction between asphalt and microcapsules. Microcapsules were mixed with asphalt by a proportion of 3 wt %, and almost all the microcapsules were kept intact even when experiencing 160 °C high temperature and mechanical agitation. It is noted that microcapsules were distributed homogeneously, which were highly likely to release rejuvenator after meeting with microcracks. A ductility self-healing test, along with fluorescence microscopy observations, was conducted to demonstrate how MUF microcapsules performed in asphalt. The test found that microcapsules were broken by the fracture energy at the tip of the crack, and thus a rejuvenator channel among microcapsules and cracks was formed to let the rejuvenator capillary-flow into the crack before the closure of microcracks. The DSR (dynamic shear rheometer) fatigue–healing–fatigue test and direct tensile test were further carried out to evaluate the healing efficiency of asphalt binder containing different contents of microcapsules.

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“…Each test was performed at 3 shear strain levels to allow for determining the following fatigue model coefficients. The initial dissipated energy model was selected among different models based on the dissipated energy method after balancing the accuracy and convenience . Testing conditions for the time sweep test are also listed in Table .…”

Section: Experimental Planmentioning

confidence: 99%

Fatigue resistance investigation of warm‐mix recycled asphalt binder, mastic, and fine aggregate matrix

Chen

et al. 2017

Fatigue Fract Eng Mat Struct

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Fatigue cracking is one of the primary distresses in warm‐mix recycled asphalt pavements. This paper evaluates the fatigue resistance evolution of warm‐mix recycled asphalt materials in different scales during the service period. The strain sweep test and time sweep test were performed, respectively, by dynamic shear rheometer to determine the linear viscoelastic limits and to characterize the fatigue behavior of warm‐mix recycled asphalt binder, mastic, and fine aggregate matrix with different ageing levels and recycling plans. The dissipated energy method was used to define the failure criterion and to construct the fatigue model. Effects of ageing levels and recycling plans on stiffness and fatigue resistance were investigated. Performance correlations among warm‐mix recycled asphalt binder, mastic, and fine aggregate matrix were developed, respectively, by the statistical method to determine the critical material scale for stiffness and fatigue resistance.

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Fatigue performance evaluation of modified asphalt binder using of dissipated energy approach

Cited by 23 publications

References 9 publications

Introducing a new specimen shape to assess the fatigue performance of asphalt mastic by dynamic shear rheometer testing

Introducing a new specimen shape to assess the fatigue performance of asphalt mastic by dynamic shear rheometer testing

Enhanced Self-Healing Process of Sustainable Asphalt Materials Containing Microcapsules

Fatigue resistance investigation of warm‐mix recycled asphalt binder, mastic, and fine aggregate matrix

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