Modulated differential scanning calorimetry study of wax-doped asphalt binders

Kovinich, Jen; Hesp, Simon A.M.; Ding, Haibo

doi:10.1016/j.tca.2021.178894

Cited by 27 publications

(8 citation statements)

References 25 publications

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“… a Note: the m -value is the unitless slope of the stiffness master curve of log S ( t ) versus log( t ) at a loading time of 60 s, which is determined according to the EN 14771 (2012) standard. The wax content is determined by the differential scanning calorimetry (DSC) method …”

Section: Methodsmentioning

confidence: 99%

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Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Zhang

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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The cracking resistance performance of an asphalt binder is a significant factor affecting the durability of asphalt pavements, and wax-based warm mix additives are devoted to improving the crack resistance of asphalt pavements. However, different components of wax-based warm mix additives (Fischer–Tropsch (F–T)-, fatty acid amide (FAA)-, polyethylene (PE)-, and linear aliphatic hydrocarbon (LAH)-based waxes) have different effects on the cracking resistance performance of the asphalt binder. Therefore, the optimum component of additives was determined by the combination of a microscopic method and a macroscopic test. The average carbon numbers of four additives were determined by a high-temperature gas chromatography (HTGC) test. The multiple stress creep recovery (MSCR), double-edge-notched tension (DENT), and extended bending beam rheological (ExBBR) tests were used to characterize the macroscopic performance of a modified asphalt binder. The F–T wax with long-chain molecules improved the high-temperature performance and lowered the degree of acceleration of thermoreversible aging. The FAA, PE, and LAH waxes with short-chain molecules enhanced the ductile fracture resistance performance. Therefore, the average carbon number as the optimum component of wax-based additives was recommended as C40 to C60.

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Section: Methodsmentioning

confidence: 99%

“…Pertinent Properties of Base Asphalt for the Wax-Based Additive Experiment a determined according to the EN 14771 (2012) standard. The wax content is determined by the differential scanning calorimetry (DSC) method 19. …”

mentioning

confidence: 99%

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Zhang

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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“…Di erential scanning calorimetry (DSC), as a representative of modern thermal analysis methods, can accurately and quickly analyze the thermodynamic properties of samples, because of simple operations such as without the need to add internal or external standard substances. e DSC has been widely used in a diverse of di erent elds, such as environmental analysis [1,2], drug purity determination [3], and rapid determination of melting point [4]. Among these applications, the accuracy of the melting point of samples is receiving growing attention from DSC.…”

Section: Introductionmentioning

confidence: 99%

Differential Scanning Calorimetry Material Studies: Benzil Melting Point Method for Eliminating the Thermal History of DSC

Zhu

Yin

et al. 2022

Journal of Chemistry

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How to eliminate the thermal history present in differential scanning calorimetry, this question has been widely concerned. Benzil has a serious thermal history that is not well eliminated by conventional thermal history methods. Herein, using benzil as a target, we developed a freeze-gradient temperature rate heating up method to eliminate the thermal history of DSC. Compared with the conventional method, this method avoids the introduction of new thermal histories by new crystalline forms that may appear during the cooling crystallization process. The results show that the peak shape of the melting peak is sharper and the peak emergence position is closer to the theoretical melting point after the elimination of the thermal history by the freeze-gradient heating up method. Based on this method, we optimized other factors to establish a complete method for the determination of melting point by DSC, analyzed the uncertainty of the method, and obtained an extended uncertainty of 0.19°C for DSC in this method. The validation results show that the p-nitrotoluene of the melting point reference substance was 52.64°C, which is within its reference value of (52.53 ± 0.20) °C, showing that this method is reliable. This study provides a reference for other thermal analysis methods to eliminate thermal history.

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“…Not only does it have wax deposition in petroleum transportation and storage projects, but it is also an important factor affecting the low-temperature durability of road surfaces. 3 In areas rich in waxy crude oil, road asphalt refining from waxy crude oil usually requires a complex dewaxing process, so the cost of producing high-quality road asphalt is high. Inhibiting the precipitation of crystalline wax in waxy asphalt is a new way to achieve low-cost upgrading of waxy asphalt.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Through dynamic mechanical analysis (DMA), 12 the steady state of the heterogeneous and homogeneous phases can be understood from kinetics and free energy. Through the differential thermal analysis (DTA) and modulated differential scanning calorimetry (MDSC), 3 the glass transition temperature and various thermal effect information can be provided. Crystallization, melting, glass transition characterization, crystal phase transition temperature and corresponding enthalpy change and entropy change, and thermodynamic properties of phase transition can be directly analyzed.…”

Section: ■ Introductionmentioning

confidence: 99%

Variable-Temperature Raman Spectroscopy Study of the Phase Transition Mechanism in Asphalt Binders

Qiu

Liu

et al. 2023

Energy Fuels

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To better understand the mechanism of precipitation and dissolution of the crystalline wax in asphalt, it is necessary to investigate the phase transition process of asphalt at different temperatures. Variabletemperature Raman spectroscopy has been employed to analyze the phase transition properties of eight asphalt binders from the SHRP material reference library. More abundant Raman spectral structure information is obtained by introducing silver nanoparticle colloids (Ag NPs) as a surfaceenhanced Raman scattering (SERS) substrate to quench the selffluorescence. The findings show that Raman spectroscopy can effectively identify different aging states of asphalt according to characteristic peaks. In the temperature range of 20−100 °C, three areas of the Raman spectrum, including 500−1200, 1300−1800, and 2500−3000 cm −1 , indicate that the asphalt has transformed from an ordered phase to a disordered phase and to a liquid phase. The order parameters are selected to represent the change of ordered and disordered structures in asphalt. The phase transition occurs mainly from the changes in the intensity and frequency of the Raman crest related to the crystal structure and distorted conformation. The temperature range of phase transitions from an ordered to a disordered range of asphalt has an obvious correlation with the wax melting point of asphalt, and the disorder degree and molecular defects of asphalt are also positively correlated with the wax content in asphalt.

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Modulated differential scanning calorimetry study of wax-doped asphalt binders

Cited by 27 publications

References 25 publications

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Differential Scanning Calorimetry Material Studies: Benzil Melting Point Method for Eliminating the Thermal History of DSC

Variable-Temperature Raman Spectroscopy Study of the Phase Transition Mechanism in Asphalt Binders

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