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

Gao, Yangming; Zhang, Yuqing; Yang, Yang; Zhang, Junhui; Gu, Fan

doi:10.1016/j.apsusc.2019.02.121

Cited by 165 publications

(54 citation statements)

References 52 publications

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“…Therefore, this FTIR analysis approach cannot evaluate the ageing effects on the fatigue behaviour of bitumen binders. It is believed that the pavements are more susceptible to fatigue cracking at later stages of their service lives when the asphalt is severely aged [24,25], and ageing induced growth of oxidation products affects the binder-aggregate molecular adhesion properties [26,27]. Therefore, further studies are needed to show the links between the chemical functional groups and the fatigue performance of long-term aged (LT-aged) modified-asphalt binders.…”

Section: Oxidative Chemical Changes and Fatigue Behaviourmentioning

confidence: 99%

Rheological and fatigue characterisation of bitumen modified by anti-ageing compounds

Omairey

Zhang

et al. 2020

Construction and Building Materials

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When exposed to the ambient environment for an extended period, bitumen ages and causes the failure of asphalt pavement, the addition of anti-ageing compounds (AACs) to bitumen binders can prolong the service life of the pavement. This study investigates the effects of anti-ageing compounds on the fatigue performance of bitumen when subjected to different ageing conditions. The AAC-modified bitumen binders were tested by dynamic shear rheometer (DSR) and Fourier transform infrared spectroscopy test (FTIR) at different ageing conditions including unaged, short-term ageing by thin film oven test (TFOT) and long-term ageing by pressure ageing vessel (PAV). The fatigue performance of the AAC-modified bitumen was characterised by the dissipated energy ratio (DER), SHRP fatigue parameter and the DSR-cracking (DSR-C) approach developed by the authors. Linear amplitude sweep (LAS) tests were firstly run at 20 °C, 10 Hz and 0.1-15% controlled shear strain conditions, to obtain the phase angles and shear moduli at the undamaged conditions. Time sweep (TS) tests were then conducted at 5% shear strain, also at 20 °C and 10 Hz, and up to 24000 loading cycles to obtain phase angles, shear moduli and DER at damaged conditions. The crack lengths in the TS tests were calculated by DSR-C model and then validated by the image analysis method. The results suggest that, compared to the DER or SHRP fatigue parameter, DSR-C predicted crack lengths show a more consistent and reliable agreement with laboratory measurements. DSR-C test can differentiate fatigue cracking performance among binders modified with AACs, and the normalised carbonyl index may be a reliable parameter to reflect the impact of ageing products on the fatigue resistance of AAC-modified binders. Bitumen samples modified with 12% (1 furfural: 5 Irganox 1076), 15% Irganox 1076 and 3.5% (3 DLTDP: 4 furfural) demonstrated the best anti-ageing behaviour by retarding carbonyl content growth and decreasing the fatigue damage among selected AACs without sacrificing the stiffness of binder. However, rutting susceptibility at earlier stages of service life needs further investigations.

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Section: Oxidative Chemical Changes and Fatigue Behaviourmentioning

confidence: 99%

Rheological and fatigue characterisation of bitumen modified by anti-ageing compounds

Omairey

Zhang

et al. 2020

Construction and Building Materials

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“…Fatigue cracking is a primary distress in asphalt pavements and caused by a repeated traffic loading. The fatigue performance of asphalt pavements is strongly related to a bituminous binder that contributes to the rheology, cohesion and adhesion properties of asphalt mixtures (Gao, Dong, Li, Wang, & Sun, 2015;Gao, Zhang, Yang, Zhang, & Gu, 2019;Zhang, Luo, Luo, & Lytton, 2014). Therefore, accurate characterisation and quantification of the fatigue resistance of the bitumen are critical for optimising the asphalt mixture design and extending the service life of pavements.…”

Section: Introductionmentioning

confidence: 99%

Predicting crack growth in viscoelastic bitumen under a rotational shear fatigue load

Zhang

Gao

2019

Road Materials and Pavement Design

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This study develops a damage mechanics-based crack growth model to predict crack length in a typical viscoelastic material (i.e., bitumen) under a rotational shear fatigue load. This crack growth model was derived using torque and dissipated strain energy equilibrium principles. The crack length was predicted using bitumen's shear moduli and phase angles in the undamaged and damaged conditions, measured by linear amplitude sweep (LAS) tests and time sweep (TS) tests, respectively. The two tests were both performed using Dynamic Shear Rheometer (DSR), thus the crack growth model was named as a DSR-C model. To validate the DSR-C model, the crack lengths after the TS tests were measured using digital visualisation of cracking surfaces for one virgin bitumen and one polymer-modified bitumen at two temperatures (15, 20 °C), two frequencies (10, 20 Hz) and two strain levels (5%, 7%) under unaged and aged conditions. Results show that the DSR-C model can accurately predict the crack length in the viscoelastic bitumen under the rotational shear fatigue load at different loading and material conditions. The crack growth includes initial transition period, steady growth period and rapid growth period under a controlled strain loading mode. The degradation of the material property results from the crack growth that initiates from the outer edge toward the centre of the sample under the rotational shear load.

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“…The unit cell of albite was cleaved to achieve a (0 0 1) surface [ 37 ] with fractional thickness of 3.0. Then, the 4

1 supercell structure of albite was formed.…”

Section: Models and Simulation Methodsmentioning

confidence: 99%

The Effect of Moisture on the Adhesion Energy and Nanostructure of Asphalt-Aggregate Interface System Using Molecular Dynamics Simulation

et al. 2020

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In this work, the influences of moisture intruded into the asphalt-aggregate interface have been investigated at the atomistic scale. The molecular interactions of asphalt with limestone and granite were studied using molecular dynamics (MD) simulations and the mineral surface components of limestone and granite were detected using the hyperspectral image technique. Relative concentration and radial distribution function (RDF) were employed for the characterization of asphalt component aggregations on aggregates surface. Adhesion work and debonding energy were also evaluated to investigate interface energy variations in asphalt-aggregate systems. MD results showed that the presence of interfacial moisture modified asphalt nanostructure and affected the aggregation state and distribution characteristics of asphalt components near aggregate surface. The study also demonstrated that the external moisture that intruded into the interface of the asphalt-aggregate system can decrease the concentration distribution of the asphalt components with powerful polarity on aggregate surface, reduce the adhesion works of the asphalt-aggregate interface, and decline the water damage resistance of asphalt mixture.

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

Cited by 165 publications

References 52 publications

Rheological and fatigue characterisation of bitumen modified by anti-ageing compounds

Rheological and fatigue characterisation of bitumen modified by anti-ageing compounds

Predicting crack growth in viscoelastic bitumen under a rotational shear fatigue load

The Effect of Moisture on the Adhesion Energy and Nanostructure of Asphalt-Aggregate Interface System Using Molecular Dynamics Simulation

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