A study on the oxidation kinetics of warm mix asphalt

Liu, Guanlan; Glover, Charles J.

doi:10.1016/j.cej.2015.05.074

Cited by 37 publications

(9 citation statements)

References 24 publications

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“…Typically, the asphalt oxidation, and subsequently stiffening, is distinguished in two phases, a non-linear fast-rate reaction and a linear constant-rate reaction phase (see Figure 1) (Van Oort 1956, Liu et al 1996, Jin et al 2011, Herrington 2012, Glaser et al 2013, Liu and Glover 2015, Herrington et al 2017, Jing 2019. Previous works focused on constant-rate kinetics of aging asphalt binder as well due to the fact that the duration of the fast rate period is considered to be relatively short of small impact on the long-term asphalt performance (Liu et al 1996, Domke et al 1999.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Oxidative aging of epoxy asphalt

Apostolidis

Liu

Erkens

et al. 2020

International Journal of Pavement Engineering

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Oxidative aging is responsible for the irreversible asphalt stiffening and embrittlement leading to asphalt pavements of increased susceptibility to fatigue and thermal cracking. In recent years, various flexible binders have been introduced in asphalt industry to produce long-life pavements and the epoxy asphalt binders are among them. Nevertheless, in-depth understanding of the oxidative aging mechanism of epoxy asphalt binders and binding systems is still needed to enable reliable predictions of material degradation through service life. In this research, the compositional and rheological changes of epoxy asphalt, with and without filler, were analysed by means of Fourier Transform Infrared spectroscopy and Dynamic Shear Rheometer. Especially, kinetics (Arrhenius) parameters of epoxy asphalt have been determined by tracking the chemical composition changes. Oxidation of carbon species in epoxy asphalt is compositional dependent, and low values of activation energy accompany in low values of reaction rate are shown by adding epoxy in asphalt. Furthermore, the epoxy asphalt mastics (binders with filler) have been subjected to rheological testing to evaluate the stiffening effect as oxidation proceeds. Increase of modulus over a wide range of frequencies, decrease of frequency dependency of modulus of epoxy asphalt and shifting of phase angle to lower values are some important observations noticed as well. Overall, oxidation in epoxy asphalt materials occurs slowly yielding to oxygen-resistant binders when epoxy compounds are incorporated in asphalt binders.

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Section: Ftir Spectroscopymentioning

confidence: 99%

Oxidative aging of epoxy asphalt

Apostolidis

Liu

Erkens

et al. 2020

International Journal of Pavement Engineering

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“…The additive selection is an expert choice, which can be based on the above-discussed findings. The WMA additives do not have any adverse effect on ageing of the asphalt binder (Liu & Glover, 2015). Besides, this process extends the investigation to the asphalt mastic and mixture level.…”

Section: Proposed Anti-ageing Additives Performance Evaluation Processmentioning

confidence: 54%

Anti-aging additives: proposed evaluation process based on literature review

Camargo

Dhia

Loulizi

et al. 2021

Road Materials and Pavement Design

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Asphalt binder ageing alters its chemical and physical properties in a manner to make it brittle and more susceptible to thermal and fatigue cracking. The ageing rate of asphalt binders depends on a combination of different factors related to their chemical composition, environmental conditions and mix design. In order to prevent ageing, anti-ageing additives are used. The selection of the optimal additive should follow an iterative process. The additive choice is made concerning each case studied. Then, the selected modified asphalt binder is short-term aged by RTFOT and long-term aged by PAV and ultraviolet (UV) weathering. Rheology performance parameters are measured by DSR and BBR before and after ageing. Consequently, ageing indices are calculated to evaluate the appropriateness of the additive. The paper discusses several findings on the rheological level accordingly to the literature. Finally, a process is proposed to harmonise the research and the engineering practices in studying anti-ageing additives effects on asphalt binders.

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“…According to the time-temperature equivalence principle, the |G * | at different temperatures and frequencies could be shifted to one master-curve under one reference temperature by the WLF function as Equation (2) shows. Given that, the composition of the mastics is complex compared to the neat asphalt binder, including different filler contents and different modified asphalt binders, the shape parameter m e of the master-curve may not be equal to 1, so the CAM model [25] was used to fit the complex modulus mastercurve of the mastics as Equation (3) exhibits. Equation 4shows the calculation of the parameter R.…”

Section: Test Setupmentioning

confidence: 99%

“…In Figure 8a, the aging index increased with the increasing filler content in a quadratic function, and the R 2 could reach 0.99. Since the oxidation of mastics is a diffusion mechanism [25,26], the effect of filler content on the aging index may come from the different binder film distributions caused by different volume of fillers inside the binder. Additionally, as shown in Figure 8b, the aging index of the mastic with unmodified binder was larger than mastics with SBS modified binder, so the modification of the binder can also influence the aging properties of mastics.…”

Section: Analysis Of Aging Indexmentioning

confidence: 99%

Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method

Jiang

Song

et al. 2019

Applied Sciences

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Asphalt mastic is a combination of binder and filler. The binder-filler system within asphalt mixtures plays an important role in adhesion between mineral aggregates. The aging of binders in pavement always happens with fillers inside or contact with mineral aggregates, so it is critical to investigate the evolved rheological property of binder-filler systems during oxidative aging. In this study, simple film oven aging methods for the aging of mastics (binder-filler system) were conducted and verified by comparing the master-curves of aged mastics at different oven positions or different aging times. The frequency sweep test was performed to measure the changing stiffness of mastics with a different combination of binders and filler contents. Test results show that oven positions could influence the aging effect of the mastics significantly, given the influence of circulation. With increasing aging times, the complex modulus increases while phase angle decreases. Comparing the mastics which were first aged then mixed with mastics which were first mixed then aged, it was observed that fillers inside the binder could accelerate aging of the mastics. Additionally, the aging index of mastics with different combinations showed that both the modification of binders and filler contents could affect the aging rate of the mastics.

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A study on the oxidation kinetics of warm mix asphalt

Cited by 37 publications

References 24 publications

Oxidative aging of epoxy asphalt

Oxidative aging of epoxy asphalt

Anti-aging additives: proposed evaluation process based on literature review

Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method

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