Lab assessment and discrete element modeling of asphalt mixture during compaction with elongated and flat coarse aggregates

Gong, Fangyuan; Liu, Yu; Zhou, Xiaodong; You, Zhanping

doi:10.1016/j.conbuildmat.2018.06.059

Cited by 75 publications

(19 citation statements)

References 20 publications

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“…For compacted asphalt mixture, studies are found on using the method for predicting and analysing bulk modulus, dilation, fracture or permanent deformation of the mixture (Collop, McDowell, & Lee, 2006;Kim & Buttlar, 2009;Ma, Zhang, Zhang, Wang, & Huang, 2018;You, Adhikari, & Dai, 2008). For uncompacted asphalt mixture, the method has been employed to investigate the mixture's compactability by simulating its densification process under different compaction modes and with different aggregate characteristics (Chen, Huang, Chen, & Shu, 2012;Chen, Huang, Shu, & Hu, 2014;Gong, Liu, Zhou, & You, 2018;Roozbahany & Partl, 2016). These studies indiate that DE method is able to simulate asphalt flow under certain conditions whereas, the mechanisms of the involved microstructural activities and how they affect the macroscopic responses of the mixture are still poorly understood.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Experimental and numerical analysis of asphalt flow in a slump test

Chen

Jelagin

Partl

2019

Road Materials and Pavement Design

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The mechanical behaviour of uncompacted asphalt mixtures is still not well understood, threatening directly to the pavement practices such as control of mixture's workability and segregation. This situation may become even worse due to the gradually increasing complexity and advances in paving materials and technologies. This study adopts a slump flow test based on concrete technology and a Discrete Element (DE)-based numerical tool to investigate the mechanical behaviour of uncompacted asphalt mixture from a microstructural point of view, particularly focusing on the bituminous binder effects. The combined experimental and numerical analysis indicates that bitumen distinctly influences the contact interactions within the mixture and thus its macroscopic flow, which can be physically interpreted as a combined effect of lubricated friction and bonding force. Additional case studies demonstrate that the DE model is capable of simulating the flow response of asphalt mixtures under changed particle contact conditions and driven force.

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Section: Introduction 1backgroundmentioning

confidence: 99%

Experimental and numerical analysis of asphalt flow in a slump test

Chen

Jelagin

Partl

2019

Road Materials and Pavement Design

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“…Thus, DE method shows its merit for studying the flow of uncompacted asphalt and, a number of research have been found on using the method to investigate asphalt compatibility, e.g. in [11][12][13][14]. When the unbound and asphalt mixtures are subjected to vibratory loading, several important factors could influence their flow behaviour: (1) the vibration condition, e.g., frequency, amplitude and time; (2) the material properties, e.g., gradation, shape, and density of particles; and (3) the contact interaction between particles, especially the adhesion effect from bituminous binder.…”

Section: Simulation Methods and Planmentioning

confidence: 99%

Vibration-induced aggregate segregation in asphalt mixtures

2020

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Aggregate segregation in asphalt mixture is a bothersome engineering issue during pavement construction. The practitioners have some measures to mitigate the segregation potential based on experiences which, however, can only reduce the risk to a certain extent. In this research, the authors aim to contribute to the discussion in a rational non-empirical way, by using novel experimental and numerical techniques. A case study is carried out to investigate the vibration-induced segregation in asphalt mixtures, corresponding to the circumstance arising during material transportation to the construction site. A novel experimental test is conducted for evaluating the segregation characteristics of asphalt mixtures under vertical vibration in laboratory conditions. A numerical investigation based on discrete element method is further performed to study the phenomenon from a micromechanical point of view. The obtained experimental and numerical results indicate that vibratory loading induces aggregate size segregation in asphalt mixtures, and the degree of segregation is influenced profoundly by the adhesive properties of bituminous binders and the aggregate gradation.

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“…Studies have shown that coarse aggregate particles in an asphalt mixture will move (migrate and rotate) during the compaction process, and elongated, flat aggregate particles tend to eventually become horizontal [33,34]. From the torque condition for an object under force, elongated, flat The crack encounters the aggregate after propagating a distance of ∆a.…”

Section: Mixture Fracture Path Analysismentioning

confidence: 99%

“…With reference to the fatigue test results and engineering application performance investigation of EAC on steel bridges for more than 12 years, the evaluated EAC showed good fatigue resistance. Studies have shown that coarse aggregate particles in an asphalt mixture will move (migrate and rotate) during the compaction process, and elongated, flat aggregate particles tend to eventually become horizontal [33,34]. From the torque condition for an object under force, elongated, flat aggregate particles are more likely to be broken off.…”

Section: Fatigue Property Of the Eac Analysismentioning

confidence: 99%

Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Wei

et al. 2020

Materials

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The flexural cracking resistance of an asphalt concrete mixture used in a steel bridge deck pavement needs to be higher than that of one used in ordinary pavement. In this study, mechanical experimental tests were used to evaluate the influence of the aggregate strength on the flexural cracking behavior of epoxy asphalt concrete (EAC). The aggregate fracture area of beam cross sections was quantitatively analyzed by digital image processing, and crack propagation in the mixture was analyzed using fracture mechanics theory. The bending test results showed that the EAC containing high-strength aggregates exhibited the highest flexural cracking resistance among all of the aggregate mixtures under the same conditions. The use of high-strength aggregates led to a reduction in the aggregate fracture area, thereby improving the flexural cracking resistance of the mixture. The aggregate strength had a significant influence on the flexural cracking propagation behavior of the mixture. Fatigue test results at strain-controlled levels of 600–1200 με and 15 °C showed that the aggregate strength had no evident influence on the fatigue properties of the EAC. It is recommended that high-strength aggregates are used to increase the fracture resistance of aggregates and the flexural crack resistance of EACs.

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Lab assessment and discrete element modeling of asphalt mixture during compaction with elongated and flat coarse aggregates

Cited by 75 publications

References 20 publications

Experimental and numerical analysis of asphalt flow in a slump test

Experimental and numerical analysis of asphalt flow in a slump test

Vibration-induced aggregate segregation in asphalt mixtures

Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

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