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

Jian, Shi; Fan, Weiyu; Wang, Tihong; Zhao, Ping; Che, Fa

doi:10.1155/2020/8860466

Cited by 6 publications

(4 citation statements)

References 27 publications

(24 reference statements)

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“…Typical among those is the surfactant WMA, which is widely used in road engineering. Shi et al [14] systematically studied the mechanism of the surfactant WMA. The results showed that the additive mainly improved the warm mix effect by providing a lubrication effect at the asphalt-aggregate interface rather than directly reducing the viscosity of asphalt.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation to Investigate the Effect of the Molecular Structure of Warm-mix Additive on Its Adsorption Properties

Xu,

Zhou,

Zhao

et al. 2024

Preprint

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In this study, the effect of the molecular structure of an asphalt warm-mix additive (WMA) on its adsorption characteristics was determined by a molecular dynamics simulation. Calculation models were established of the adsorption-film forming of an imidazoline WMA on the surfaces of the typical minerals (CaCO3) and quartz (SiO2). The effect of the change in the length of the WMA's hydrophobic carbon chain on system adsorption and lubrication was further investigated. The simulation results show that the HOMO and LUMO orbital distributions of the long-chain aliphatic imidazoline WMA are mainly delocalized on the imidazoline ring and hydrophilic group. As the length of the carbon chain at the hydrophobic end of the WMA increases, the EHOMO of the WMA gradually increases, the ELUMO gradually decreases, and the energy difference between HOMO and LUMO decreases. Also, as that length increases, the adsorption energy of the WMA on SiO2 (0 0 1) and calcite (1 0 4) surfaces, as well as the film's cohesive energy, all increase continuously. In addition, the adsorption energy of the WMA on the SiO2 (0 0 1) surface and the film's cohesive energy exceed those on the calcite (1 0 4) surface. In the adsorption films formed on the SiO2 (0 0 1) and calcite (1 0 4) surfaces, the MSD of the WMA in each system increases with time. Meanwhile, as the hydrophobic-end alkyl chain length of the WMA increases, the MSD and the self-diffusion coefficient gradually increase, and the molecular diffusivity is enhanced. Additionally, the MSD and self-diffusion coefficient of the WMA on the SiO2 (0 0 1) surface exceed those on the calcite (1 0 4) surface. In conclusion, the study researched the adsorption-film-forming behavior of the surfactant WMA on the aggregate surface, providing a theoretical basis for the mechanism of warm-mixing and the development of a new WMA.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation to Investigate the Effect of the Molecular Structure of Warm-mix Additive on Its Adsorption Properties

Xu,

Zhou,

Zhao

et al. 2024

Preprint

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“…WMA technology originated in Europe [9], and has been widely used all over the world [10]. The purpose of WMA technology is to reduce the viscosity of asphalt binder at high temperature [11,12] by various methods such as the use of organic viscosity reduction additives [13], the foaming viscosity reduction method [14] or using surface-active viscosity reduction additives [15] without reducing the construction quality and mixture performance of the resulting asphalt mixtures, so as to reduce the mixing temperature of these mixtures [8,16]. Compared with HMA, WMA can reduce fuel consumption by more than 40% and reduce the asphalt aging effects caused by high temperatures [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of Low-Temperature Construction Additives (LCAs) on the Performance of Asphalt Mixtures

Feng

Chen

et al. 2022

Materials

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Green production of asphalt materials is very important to promote energy savings and emission reduction during the construction and maintenance of asphalt pavement. A low-temperature construction additive (LCA) made from the waste plastic and waste rubber is proposed, which belongs to a class of environmentally friendly additives for asphalt mixtures. Marshall stability was tested to evaluate the mechanical performance of LCA-modified asphalt mixtures (LCA-AMs). In order to determine the best preparation parameters of LCA-AMs, the influence of the content and LCA addition method on the strength of LCA-AMs was studied. In addition, the impact of epoxy resin (ER) on the mixtures’ performances was evaluated. The results show that the LCA can significantly reduce the formation temperature of asphalt mixtures, and the resulting asphalt mixtures have good workability in a lower temperature range (90–110 °C). The ER should be added to the LCA-AMs after 4 h of curing. All the volumetric properties satisfy the technical requirements. The low-temperature crack resistance and fatigue resistance of LCA-AMs were obviously improved with appropriate dosages of ER, which can effectively improve the mechanical performance of the asphalt mixtures. The ER can significantly increase the rutting resistance and water sensitivity of LCA-AMs, therefore making it feasible to improve the mixture performance by the enhancement provided by a low dosage of ER.

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“…Warm mix asphalt (WMA) refers to a form of asphalt mixture with mixing and compaction temperatures 20-55 • C lower than typical hot mix asphalt (HMA) [1][2][3]. The goal of WMA is to produce mixtures with substantially the same road performance and construction workability as HMA under significantly reduced production temperatures [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…However, thus far, the mechanism by which WMA technology makes the mixture easy to mix and compacted at low temperatures is not fully understood [18]. It was found that the reduction in binder viscosity caused by WMA additives was insufficient to explain the decrease in the production and compaction temperature of the final mixture in the field [2,19,20]. Conversely, in some cases, the addition of WMA additives strengthens the viscosity of the binder [18].…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanism of Surfactant Warm Mix Asphalt Additive-Based on Molecular Dynamics Simulation

Zhao

Dong

Yang³

et al. 2021

Coatings

Self Cite

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Warm mix asphalt (WMA) technology can bring certain environmental and technical benefits through reducing the temperature of production, paving, and compaction of mixture asphalt. Recent studies have shown that some WMA additives are able to reduce the temperature by increasing the lubricating properties of asphalt binder-based on the tribological theory, this paper studied the mechanism of adsorbing and lubricating film of base asphalt and WMA on the surface of stone by molecular dynamics (MD) simulation method, and the effect of surfactant WMA additive on the lubrication performance of the shear friction system of “stone–asphalt–stone”. The model of base asphalt lubricating film, including saturates, aromatics, resin and asphaltene, as well as the model of warm mix asphalt lubricating film containing imidazoline-type surfactant WMA (IMDL WMA) additive molecule, were established. The shear friction system of “stone–asphalt–stone” of base asphalt and warm mix asphalt was built on the basis of an asphalt lubrication film model and representative calcite model. The results show that the addition of IMDL WMA additive can effectively improve the lubricity of asphalt, reduce the shear stress of asphalt lubricating film, and increase the stability of asphalt film. The temperature in the WMA lubricating film rises, while the adsorption energy on the stone surface decreases with the increase of shear rate, indicating that the higher the shear rate is, the more unfavorable it is for the WMA lubricating film to wrap on the stone surface. In addition, the shear stress of the WMA lubricating film decreased with increasing temperature, while the shear stress of the base asphalt lubricating film increased first and then decreased, demonstrating that the compactability of the asphalt mixture did not improve linearly with the increase of temperature.

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

Cited by 6 publications

References 27 publications

Molecular Dynamics Simulation to Investigate the Effect of the Molecular Structure of Warm-mix Additive on Its Adsorption Properties

Molecular Dynamics Simulation to Investigate the Effect of the Molecular Structure of Warm-mix Additive on Its Adsorption Properties

Effects of Low-Temperature Construction Additives (LCAs) on the Performance of Asphalt Mixtures

Research on the Mechanism of Surfactant Warm Mix Asphalt Additive-Based on Molecular Dynamics Simulation

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