Non-isothermal low-temperature reversible aging of commercial wax-based warm mix asphalts

Qiu, Yanjun; Ding, Haibo; Su, Ting

doi:10.1080/10298436.2020.1757670

Cited by 22 publications

(5 citation statements)

References 45 publications

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“…The binodal distribution begins to appear with the decrease of the average carbon number, and the distribution shape of the LAH wax shows the Gaussian and binodal distributions. As expected, the results of the carbon number distribution are almost consistent with the results of the differential scanning calorimetry (DSC) test . There is another endotherm peak above 100 °C in the DSC test, which can be because the hydrocarbons with a higher carbon number are out of the detecting range of HTGC.…”

Section: Resultssupporting

confidence: 84%

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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: Resultssupporting

confidence: 84%

“…As expected, the results of the carbon number distribution are almost consistent with the results of the differential scanning calorimetry (DSC) test. 40 There is another endotherm peak above 100 °C in the DSC test, which can be because the hydrocarbons with a higher carbon number are out of the detecting range of HTGC.…”

Section: ■ Experimental Methodsmentioning

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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“…The other process is ductile failure. The link between thermoreversible aging and wax components in the asphalt has been confirmed by many researchers. − Solid–solid transitions (wax restructuring), rigid amorphous phase formation, and spinodal decomposition (paraffinic demixing) are three mechanisms that can explain how crystalline wax contributes to the thermoreversible aging of a binder. Once crystalline wax precipitates from the asphalt matrix during gradual cooling or isothermal conditioning, more interfacial phases are created.…”

Section: Introductionmentioning

confidence: 89%

Balancing the Use of Wax-Based Warm Mix Additives for Improved Asphalt Compaction with Long-Term Pavement Performance

Ding

Hesp

2021

ACS Sustainable Chem. Eng.

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Using wax-based warm mix additives allows contractors to lower production and compaction temperatures of asphalt, thereby reducing greenhouse and other harmful gas emissions in pavement construction. However, excessive wax can adversely affect the long-term durability of the pavement. In order to quantify solid wax, the effects of selected commercial additives on spectral and thermal properties of asphalt binder were studied by variable-temperature Fourier-transform infrared spectroscopy (VT-FTIR) and differential scanning calorimetry (DSC). The VT-FTIR reduced spectral area versus temperature plots for waxdoped asphalt binder were found to have three distinct parts from which solid wax contents could be determined. The wax precipitation temperature (WPT), obtained from DSC measurements of heat flow during cooling, was found to increase with additive content. In contrast, the wax melting out temperature (WMT), determined upon heating, appears to be independent of the additive content.

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“…Kriz et al [10] and Isaac et al [11] believed that wax crystallization was the main cause of thermoreversible aging. Ding et al [12,13], Qiu et al [14] and Zhang et al [15] studied the influence of a variety of wax-based warm-mix additives on thermoreversible aging in asphalt, indicating that the influence of wax-based warm-mix additives on thermoreversible aging was less than that of oxidation aging, and recommended the best combination of carbon atoms for wax-based warm-mix additives. On the other hand, due to the low mixing temperature of wax-based warm-mix asphalt mixture, moisture in the asphalt mixture cannot be completely removed, resulting in a wax-based warm-mix asphalt mixture being more vulnerable to moisture than a hot-mix asphalt mixture [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

et al. 2022

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Wax is an important factor that affects the durability of asphalt binder. In order to understand the molecular weight distribution and branching of wax on the moisture sensitivity of asphalt binder, pure wax-doped asphalt binders are prepared and the performance of model asphalt binders are evaluated by surface free-energy (SFE) and binder bond strength (BBS) tests. In addition, asphaltene is regarded as an additive in this study. The results show that the addition of eicosane, triacontane, squalane and asphaltene can reduce the moisture sensitivity of asphalt, but not necessarily improve its moisture-induced damage resistance. The physical hardening effect of high-wax asphalt and its model asphalt is stronger than that of the corresponding low-wax asphalt and its model asphalt, and its moisture sensitivity is weaker than that of the low-wax asphalt. For all the model asphalts, there is a good correlation between the cohesion work, cohesion POTS (pull-off tensile strength), POTS ratio (the BBS moisture sensitivity index) and ER (the SFE moisture sensitivity index). When using the BBS test to characterize the moisture sensitivity of high-wax asphalt, it is recommended to leave the sample for some time until it is physically hardened and stable.

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Non-isothermal low-temperature reversible aging of commercial wax-based warm mix asphalts

Cited by 22 publications

References 45 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

Balancing the Use of Wax-Based Warm Mix Additives for Improved Asphalt Compaction with Long-Term Pavement Performance

Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

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