Effects of kneading and impact action on the movement of aggregates in asphalt mixtures during compaction

Li, Yupeng; Jian, Wei; Xiao, Jingjing; Zhao, Funan; Zhang, Shuangjiao; Xing, Chengwei; Yuan, Dongdong

doi:10.1016/j.conbuildmat.2022.130210

Cited by 12 publications

(2 citation statements)

References 42 publications

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“…DEM allows for representing the different constituents (aggregates and binder) and modelling their interaction when subjected to time-constant or transient mechanical and thermal effects. The 3D rigid particle models with randomly distributed spherical particles and adopting elastic and/or simple viscoelastic models at the contacts are the standard approach [4], however, in recent years, a significant research effort is noted to incorporate realistic particle morphologies in the numerical models [5]. Several methods have been used to obtain the 3D models of individual particles and to represent them in the DEM assembly.…”

Section: Introductionmentioning

confidence: 99%

Improving asphalt discrete numerical modelling with realistic particle shapes

Micaelo,

Monteiro-Azevedo,

Câmara

2023

VIII International Conference on Particle-Based Methods

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Micromechanical modelling based on the Discrete Element Method (DEM) has been widely used to investigate asphalt behaviour due to its ability to represent an irregular microstructure with variable-sized aggregates, bitumen and voids. The 3D rigid particle models with randomly distributed spherical particles and adopting elastic and/or simple viscoelastic models at the contacts are the standard approach, however, in recent years, a significant research effort is noted to incorporate real particle morphologies in the numerical models. In this study, a previously developed 3D DEM model of asphalt employing a generalised Kelvin contact model formulation for the viscoelastic contacts is further improved with realistic particle shapes representing the coarse aggregates. A digital library of aggregate shapes was created from the X-ray computed tomography (CT) scan of an asphalt specimen, using an adaptive image-processing method to separate the aggregates in the CT images and the Delaunay triangulation method to define the aggregate 3D surface model. Several virtual aggregates with different sizes were selected from the library to represent the coarse aggregate gradation of the modelled 3D DEM asphalt specimen. Each virtual aggregate is discretized with smaller spherical particles and its deformability is taken into account through the inner particle contacts. The numerical asphalt specimens with realistic particle shapes were submitted to uniaxial tension-compression cyclic tests to determine the stiffness properties, and the results were compared with those of the numerical specimens with all constituents represented by single spherical rigid particles. As shown, the proposed methodology greatly enhances the 3D DEM model's ability to simulate the asphalt behaviour.

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Section: Introductionmentioning

confidence: 99%

Improving asphalt discrete numerical modelling with realistic particle shapes

Micaelo,

Monteiro-Azevedo,

Câmara

2023

VIII International Conference on Particle-Based Methods

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“…For the SMA asphalt surface pavement of a cement concrete bridge deck, balanced pavement compaction and skid resistance is the key to solve the problem of road wearing course construction quality. Early research on the influence of compaction methods was limited by technology, and the evaluation of compaction quality mainly focused on the macroscopic volume parameters and mechanical properties of the mixture specimens [18]. In this paper, the compaction effect of pavements under different rolling processes was analyzed through the construction of the upper layer of a highway bridge section, and the effect of construction temperature and the rolling process on the degree of wear of the structure was carried out according to digital image processing.…”

Section: Introductionmentioning

confidence: 99%

Research on the Rolling Process of SMA-13 Asphalt Surface Layer for Bridge Decks Based on Compaction and Skid Resistance Equilibrium Problems

Zhou,

Zhang,

Liang

et al. 2023

Buildings

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In order to solve the equilibrium problem related to compaction degree, structural integrity of skid resistance, and skid resistance of asphalt wearing layer on a concrete bridge deck, the influence of rolling mode on compaction degree, structural integrity of skid resistance, and skid resistance performance was analyzed according to compaction curve characteristics, image processing technology, and laser method from the compaction mechanism and temperature control of rolling equipment. The results showed that the compaction degree and rolling times of an SMA-13 asphalt wearing course on the bridge deck could be characterized by a logarithmic model, and the model parameters had clear physical significance. Compared with the vibratory roller, the oscillation roller could achieve a greater and more stable compaction degree of the mixture and maintain a better density, compaction degree, and void ratio after 5 times of oscillation rolling. The pavement wear characteristics were extracted by a digital image method. The results showed that with the increase in rolling times, the rolling temperature decreased gradually, and the wear rate of surface texture increased significantly. The multiscale evaluation of pavement antiskid performance by a laser method showed that the surface structure gradually decreased and tended to be stable (1.2 mm) with the increase in rolling times of the vibratory roller, the microscopic texture density increased with the increase in rolling times, and the proportion of acute angle (<90°) in the peak angle of the surface texture profile decreased with the increase in rolling times. The SMA-13 asphalt wearing course on the bridge deck was rolled by a vibratory roller for 6 times, so as to achieve the balance of compaction degree, structural integrity, and skid resistance.

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