An investigation into the impact of warm mix asphalt additives on asphalt mixture phases through a nano-mechanical approach

Duraid, M.; Al-Khalid, Hussain; Akhtar, Riaz

doi:10.1016/j.conbuildmat.2018.08.165

Cited by 20 publications

(5 citation statements)

References 22 publications

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“…where τ p is the peak shear stress; the peak pseudo strain γ p R during this loading cycle can be calculated by Equation (7):…”

Section: S-vecd Modelmentioning

confidence: 99%

“…Generally, the modified asphalt mixture needs to achieve a better modification effect when the stirring temperature is 175-185 • C. This kind of high-temperature mixing not only seriously increases the degree of asphalt aging, but also leads to a serious increase in energy consumption costs, nitrogen and sulfide and other harmful soot emissions increased significantly [6,7]. In order to solve the problem of high construction temperature of modified asphalt mixture, a variety of asphalt warm mixing technologies emerge at the historic moment, which can reduce the construction temperature by 20-30 • C and still can be normally compacted, which is promoted in the industry as an important technical measure of energy saving and emission reduction.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Mechanism, Aging and Fatigue Performance of Warm Mixing Speed Melting SBS Modified Asphalt Binders

Zhuang

Yue

Men³

et al. 2023

Coatings

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In this study, two kinds of quick melting modifier SBS-T and SBS-W, as well as the traditional SBS modifier, were used in the optimization design of asphalt binders. The changes in material structure and fatigue properties of three polymer-modified asphalt after adding 3% Sasobit to warm mix agent were investigated. The feasibility of SBS-T and SBS-W in asphalt binder was discussed from the modification mechanism and fatigue properties. In order to reveal the modification mechanism, the interaction mechanism between the fast-melting SBS modifier and the base asphalt was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The temperature sensitivity and viscoelastic properties of SBS-T and SBS-W modified binders were determined by frequency scanning (FS). The fatigue properties of SBS-T and SBS-W modified binders were tested by linear amplitude scanning (LAS). The results of FTIR showed that there was no chemical reaction between the SBS-T and SBS-W and the base asphalt. XRD results showed that SBS-W-modified asphalt has stronger fluidity. The results of FS and LAS showed that the asphalt binder with Sasobit has good stiffness and elastic recovery ability, and the same SBS-T and SBS-W have better temperature sensitivity and deformation resistance. In addition, the fatigue life of asphalt binder under the linear viscoelastic continuous damage theory is increased 3.9 times by SBS-W.

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“…where τ p is the peak shear stress; the peak pseudo strain γ p R during this loading cycle can be calculated by Equation (7):…”

Section: S-vecd Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanism, Aging and Fatigue Performance of Warm Mixing Speed Melting SBS Modified Asphalt Binders

Zhuang

Yue

Men³

et al. 2023

Coatings

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show abstract

“…It can be seen from Figure 4 that the viscosity of all samples decreases with an increase in shear rate, which indicates shear thinning. All flow curves can be fitted with the Cross model using formula (9) to determine the zeroshear viscosity.…”

Section: Effect Of Surfactant Warm MIXmentioning

confidence: 99%

“…ese reductions in mixing and compaction temperatures greatly reduce asphalt smoke emissions and energy consumption and can greatly reduce the aging of the asphalt binder, thus increasing the service life of asphalt pavement [7,8]. As the compaction performance of low-temperature asphalt improves, asphalt's limited transportation and construction times can be extended [9]. In addition, the application of WMA to the recycling of waste asphalt mixtures can increase the proportion of reclaimed asphalt pavement (RAP) that can be reused [10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Physical Performance and Working Mechanism of Asphalt Containing a Surfactant Warm Mix Additive

Jian

Fan

Wang

et al. 2020

Advances in Materials Science and Engineering

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This paper analyzes the influence of a surfactant warm mix additive on unmodified asphalt’s conventional performance, viscosity-temperature characteristics, surface energy, and spreading performance on aggregate surfaces. The effect of the additive on asphalt’s microstructure was explored by infrared (IR) spectral analysis. The results show the additive has little influence on the penetration, softening point, ductility, and viscosity-temperature characteristics of asphalt; this suggests that the additive does not work by lowering viscosity. The additive can reduce the zero-shear viscosity of asphalt, and adding too much can reduce antirutting performance. The additive also increases the asphalt’s surface energy and the asphalt-water contact angle, while the polar component of surface energy decreases. The additive improves the spreading performance of asphalt on aggregate surfaces and reduces the asphalt-aggregate contact angle; the lower the temperature, the greater the reduction. IR spectral analysis shows that the additive does not react with asphalt—only physical blending occurs. The addition of a surfactant warm mix additive to asphalt allows asphalt mixtures to be more easily mixed and compacted at lower temperatures, thereby saving energy.

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“…Compared with hot mix asphalt (HMA), warm mix asphalt (WMA) can be mixed with aggregate at lower temperatures and reduces energy consumption. The mixing temperature of WMA is usually 20 to 40 °C lower than that of HMA [ 1 , 2 , 3 , 4 ]. WMA can improve the workability of asphalt binders and reduce the emission of harmful gases.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Adhesion Performance of Wax Based Warm Mix Asphalt with Molecular Dynamics Simulation

et al. 2022

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Compared with traditional hot mix asphalt (HMA), wax based warm mix asphalt (WWMA) can be mixed with the aggregate at a lower temperature and achieve the desired compaction. However, the adhesion performance of WWMA on aggregate is uncertain. To evaluate the adhesion performance of asphalt and aggregate, researchers used contact angle test, pull-off test, and ultrasonic washing experiments. However, these tests cannot adequately explain the microscopic mechanism of the interface between asphalt and aggregate. Molecular dynamics (MD) can better explain the adhesion mechanism of asphalt aggregates because they can be simulated at the molecular scale. So, the purpose of this research is to use the MD method to study the adhesion performance between WWMA and aggregate. Two aggregate oxides (CaCO3 and SiO2) models, the matrix asphalt model and WWMA models, were built in Materials Studio (MS) software. The adhesion work of asphalt and aggregate oxides was calculated. With the increase of wax modifier content, the adhesion work of asphalt and aggregate oxides (CaCO3 and SiO2) first increases and then decreases. When the wax modifier is increased to 3 wt%, the adhesion works of the WWMA-SiO2 and WWMA-CaCO3 increase by 31.2% and 14.0%, compared with that of matrix asphalt. In this study, the accuracy of the MD calculation result was verified by the pull-off experiments and the contact angle experiments. WWMA was prepared by a high-shear mixer emulsifier. In the pull-off experiments and the contact angle experiments, the tensile strength and the adhesion work between the aggregate and the asphalt containing 3% wax modifier reaches peak values. These values are 140.7% and 124.9%, compared with those between the aggregate and the matrix asphalt. In addition, the results of the pull-off experiments and the contact angle experiments are in good agreement with that of the MD simulation. Finally, Fourier transform infrared spectroscopy (FTIR) shows that the carbonyl content of WWMA is greater than that of matrix asphalt. It explains well that the wax modifier promotes the adhesion between asphalt and aggregate. This paper provides an important theoretical basis to understand the adhesion performance of WWMA and aggregate.

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An investigation into the impact of warm mix asphalt additives on asphalt mixture phases through a nano-mechanical approach

Cited by 20 publications

References 22 publications

Experimental Study on Mechanism, Aging and Fatigue Performance of Warm Mixing Speed Melting SBS Modified Asphalt Binders

Experimental Study on Mechanism, Aging and Fatigue Performance of Warm Mixing Speed Melting SBS Modified Asphalt Binders

Evaluation of the Physical Performance and Working Mechanism of Asphalt Containing a Surfactant Warm Mix Additive

Investigation of Adhesion Performance of Wax Based Warm Mix Asphalt with Molecular Dynamics Simulation

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