Viscoelastic micromechanical model for dynamic modulus prediction of asphalt concrete with interface effects

Dong, Man Sheng; Gao, Yangming; Li, Ling lin; Wang, Li Na; Sun, Zhi

doi:10.1007/s11771-016-3140-y

Cited by 17 publications

(7 citation statements)

References 27 publications

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“…Recently, Li and Greenfield [23,24] However, limited work has been focused on the effects of bitumen's oxidative aging on the adhesion of the bitumen-mineral interface at the molecular scale, particularly when the minerals are different and water are present. The authors' previous studies have found that the interfacial adhesion between the bitumen and aggregate played a critical role in determining the viscoelastic characteristics and cracking performance of the asphalt mixtures [27][28][29][30][31]. The interfacial interaction between bitumen and mineral surfaces has been investigated using…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Molecular dynamics investigation of interfacial adhesion between oxidised bitumen and mineral surfaces

Gao

Zhang

Yang

et al. 2019

Applied Surface Science

161

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The interfacial adhesion between oxidised bitumen and mineral surfaces at dry and wet conditions was investigated using molecular dynamics (MD) simulations. Molecular models were built for virgin and oxidised bitumen components including saturate, aromatic, resin and asphaltenes. The bitumen models and four representative mineral substrates (namely quartz, calcite, albite and microcline) were employed to construct bitumen-mineral interface systems. These models were validated by the experimental results and MD simulations reported in the literature. The hardening mechanism of the aged bitumen was analysed by comparing the density, cohesive energy density and fraction of free volume between the virgin and oxidised bitumen. Work of adhesion was computed to quantify the adhesive bonding property of the bitumen-mineral interface systems for the virgin, lightly oxidised and heavily oxidised bitumen models under dry and wet conditions. Results show that the oxidised products (carbonyl and sulfoxide) strengthen the intermolecular bonding, resulting in molecular

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Section: Accepted Manuscriptmentioning

confidence: 99%

Molecular dynamics investigation of interfacial adhesion between oxidised bitumen and mineral surfaces

Gao

Zhang

Yang

et al. 2019

Applied Surface Science

161

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“…They found that the bond energy of an asphalt mixture dominated the crack initiation and propagation processes and it increases with aging period and loading rate and decreases with temperature [3][4]. Previous studies have reported that the mechanical properties of asphalt mixtures had a strong dependency upon the interfacial bond between bitumen and aggregate [5][6]. Therefore, the adhesion of the bitumen-aggregate interface needs to be strong and durable under the complex traffic and environment conditions.…”

Section: Introductionmentioning

confidence: 99%

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Gao

Zhang

et al. 2018

Construction and Building Materials

161

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This study aims to evaluate the effects of mineral types and water on the adhesion properties and debonding behaviours of bitumen-mineral interface systems. A molecular dynamics modelling approach was employed to simulate the interactions between minerals and bitumen with and without the presence of water. Four representative minerals (quartz, calcite, albite and microcline) were selected to build the mineral-bitumen interface systems and the mineralwater-bitumen interface systems in the molecular dynamics models. The adhesion property between minerals and bitumen was quantified by work of adhesion, defined as the energy required to separate a unit area of the bitumen-mineral interface. The debonding behaviour between minerals and bitumen is characterised by work of debonding, defined as the energy required to displace bitumen by water at the mineral-bitumen interface. The simulation results were validated by available experimental results reported in the literature. It was found that the work of adhesion and the work of debonding for the four bitumen-minerals interface systems are ranked microcline > albite > calcite > quartz at both dry and wet conditions. Moisture can reduce the adhesion between minerals and bitumen by 82%, 84%, 18% and 1% for the quartz, calcite, albite and microcline, respectively. The adhesion between minerals and bitumen is attributed to the non-bond interaction energy, in which the major component is van der Waals interaction for neutral minerals (e.g., quartz) and the electrostatic interaction for the alkali minerals (e.g., calcite, albite and microcline). The bitumen-mineral debonding is a thermodynamically favourable process with reduced total potential energy of the system. It is concluded that the bitumen-mineral adhesion and debonding behaviours strongly depends on the chemistry and mineralogical properties of the minerals. This work provides a fundamental understanding of the adhesion and debonding behaviours of the bitumen-mineral interface at the atomistic scale.

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“…The tested specimens are typical composites, whose constituents with different mechanical performance include limestone aggregate, asphalt and air voids [4,10,34]. However, the same limestone columns may have some differences in physical properties among them, and the fabricating process of specimens may also contribute to the non-uniform asphalt films.…”

Section: Analysis and Evaluation Of The General Test Resultsmentioning

confidence: 99%

“…In general, the rheological properties of asphalt mixture are the basis for a better understanding of the mechanical behavior of asphalt pavements. During the research of the rheological properties of asphalt materials, one must be clear about the temperature, bonding condition and other influence factors, because the mechanical behavior which is susceptible to internal bonding condition and experiment process shows elasticity, viscoelasticity, viscoplasticity in stages [2][3][4]. Numerous studies [5][6][7] prove that the physical properties and mechanical performance of asphalt mixtures are directly dominated by the different manufacturing methods and morphological features at mesoscale level, such as shapes, distribution, asphalt content and void ratio.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism analysis of asphalt–aggregate systems subjected to direct shear loading

et al. 2017

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In order to investigate the mechanical behavior of asphalt-aggregate systems subjected to direct shear loading and reveal the shear failure mechanism, four groups of direct shear tests were conducted on composite specimens under different experimental conditions with a self-manufactured direct shear test apparatus at 25°C. Comparative studies were conducted to evaluate the effects of stone surface treatment, asphalt film thickness and loading rate on the shear mechanical behavior of asphaltaggregate specimens. Results showed that two kinds of the complete stress-displacement curves, including the general single-peak curve and the first-known double-peak curve, were clearly observed for each condition. In addition, the internal failure mechanisms were analyzed based on qualitative and quantitative methods. It can be concluded that the potential failure modes of the direct shear test include adhesive failure at the asphalt-aggregate interface and cohesive failure within the asphalt film. The research results enhance understanding of the shear mechanical behavior and failure mechanism of asphalt mixture, and also provide a reference for the interfacial failure.

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Viscoelastic micromechanical model for dynamic modulus prediction of asphalt concrete with interface effects

Cited by 17 publications

References 27 publications

Molecular dynamics investigation of interfacial adhesion between oxidised bitumen and mineral surfaces

Molecular dynamics investigation of interfacial adhesion between oxidised bitumen and mineral surfaces

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Failure mechanism analysis of asphalt–aggregate systems subjected to direct shear loading

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