Crack initiation in asphalt mixtures under external compressive loads

Zhang, Yuqing; Luo, Xue; Luo, Rong; Lytton, Robert L.

doi:10.1016/j.conbuildmat.2014.09.009

Cited by 80 publications

(28 citation statements)

References 46 publications

(61 reference statements)

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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

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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

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161

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“…(1) When the load cycle is zero (N = 0), c is equal to the average air void size, which has a regression relation with the air void content as follows [30]:…”

Section: Assessment Of Field Fatigue Performancementioning

confidence: 99%

Implementation of pseudo J-integral based Paris’ law for fatigue cracking in asphalt mixtures and pavements

2015

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Pavement analysis and design for fatigue cracking involves a number of practical problems like material assessment/screening and performance prediction. A mechanics-aided method can answer these questions with satisfactory accuracy in a convenient way when it is appropriately implemented. This paper presents two techniques to implement the pseudo J-integral based Paris' law to evaluate and predict fatigue cracking in asphalt mixtures and pavements. The first technique, quasi-elastic simulation, provides a rational and appropriate reference modulus for the pseudo analysis (i.e., viscoelastic to elastic conversion) by making use of the widely used material property: dynamic modulus. The physical significance of the quasi-elastic simulation is clarified. Introduction of this technique facilitates the implementation of the fracture mechanics models as well as continuum damage mechanics models to characterize fatigue cracking in asphalt pavements. The second technique about modeling fracture coefficients of the pseudo J-integral based Paris' law simplifies the prediction of fatigue cracking without performing fatigue tests. The developed prediction models for the fracture coefficients rely on readily available mixture design properties that directly affect the fatigue performance, including the relaxation modulus, air void content, asphalt binder content, and aggregate gradation. Sufficient data are collected to develop such prediction models and the R 2 values are around 0.9. The presented case studies serve as examples to illustrate how the pseudo J-integral based Paris' law predicts fatigue resistance of asphalt mixtures and assesses fatigue performance of asphalt pavements. Future applications include the estimation of fatigue life of asphalt mixtures/pavements through a distinct criterion that defines fatigue failure by its physical significance.

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“…ΔG = bond energy of the asphalt mixture, which represents a combined bond energy for cohesive fracture and adhesive fracture. A higher temperature or a lower loading rate induces more percentage of cohesive fracture and therefore leads to a lower bond energy (4). The temperature and rate dependent bond energy for an asphalt mixture is modelled as:…”

Section: Viscofracture (Vf)mentioning

confidence: 99%

“…11,12,16,19,and 24). The authors have also presented systematic testing and data analysis methods in previous studies to determine the material properties and model parameters, details of which are not repeated in this paper but referred to the publications (4,5,17,25,37). Four asphalt mixtures were selected to validate the VEPF models and the weak form PDE based FE modeling.…”

Section: Materials Properties As Model Inputsmentioning

confidence: 99%

Viscoelasticplastic–Fracture Modeling of Asphalt Mixtures Under Monotonic and Repeated Loads

Zhang

Birgisson

et al. 2017

Transportation Research Record: Journal of the Transportation R

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Rutting and cracking occur simultaneously in asphalt mixtures as observed in the field and laboratory. Existing mechanical models have not properly addressed viscoelastic and viscoplastic deformation together with cracking due to model deficiencies, parameter calibration and numerical inefficiency. This study develops viscoelastic-plastic-fracture (VEPF) models characterizing viscoelasticity (VE) by Prony model and viscoplasticity (VP) by Perzyna's flow rule with a Generalized Drucker-Prager (GD-P) yield surface and a non-associated plastic potential. Viscofracture (VF) damage is modelled by a viscoelastic Griffith criterion and a pseudo J-integral Paris' law for crack initiation and propagation, respectively. The VEPF models are implemented in a finite element (FE) program using a weak form partial differential equation (PDE) modeling technique with no need to program user-defined material subroutines. Model parameters were derived from fundamental material properties using dynamic modulus, strength and repeated load tests. Simulations indicate that the VE-VP-VF characteristics are effectively modelled by the VEPF models for different asphalt mixtures at different confinements and temperatures. An asphalt mixture under monotonic compressive loads exhibits a sequenced process including a pure VE deformation stage, a coupled VE-VP deformation stage, a VE-VP deformation coupled with VF initiation and propagation stage, and then a VE-VF rupture stage with saturated VP deformation. The asphalt mixture under repeated loads yields an increasing VP strain at an increasing rate during the first half of the haversine load while a decreasing VP strain increment with load cycles. The PDE-based FE is capable of effectively modeling the coupled VE-VP-VF behaviors of the asphalt mixtures.

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Crack initiation in asphalt mixtures under external compressive loads

Cited by 80 publications

References 46 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

Implementation of pseudo J-integral based Paris’ law for fatigue cracking in asphalt mixtures and pavements

Viscoelasticplastic–Fracture Modeling of Asphalt Mixtures Under Monotonic and Repeated Loads

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