Meso-structural characteristics of asphalt mixture main skeleton based on meso-scale analysis

Shi, Liwan; Wang, Duanyi; Xiao, Xin; Qin, Xiao

doi:10.1016/j.conbuildmat.2019.117263

Cited by 39 publications

(10 citation statements)

References 27 publications

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“…Because the specimen has a small transverse deformation, the x-axial CR value of 9.5-4.75 mm aggregates is small when these aggregates are the major part of the skeleton structure. This also shows that coarse aggregates play an important role in resisting permanent deformation [50,51]. In addition, compared with the CR value of aggregates with diameters larger than 4.75 mm for rutting deformation, the x-axial CR value of these aggregates only has a little change.…”

Section: Analysis and Discussionmentioning

confidence: 75%

Investigation on the Micro Deformation Mechanism of Asphalt Mixtures under High Temperatures Based on a Self-Developed Laboratory Test

Guo

Meng

et al. 2020

Materials

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Rutting has always been considered the main disease in asphalt pavement. Dealing with rutting disease would be benefitted by understanding the formation of rutting and testing the rutting performance of mixtures more reasonably. The objective of this paper is to systematically investigate the rutting mechanism by employing a self-designed rutting tester along with the corresponding numerical simulations. The deformation of different positions of the existing tracking tester was found to be inconsistent, and the loading was not in line with reality. Accordingly, a more practical tester was proposed: the reduced scale circular tracking (RSCT) tester integrates the functions of asphalt mixture fabrication and rutting monitoring. The results demonstrated that the loading of the new tester is closer to the actual situation. In addition, determining the stress and displacement characteristics of particles in the asphalt mixture was found to be difficult due to the limitations of the testing methods. Therefore, a two-dimensional virtual rutting test based on the RSCT was built using PFC2D (Particle Flow Code 2 Dimension) to investigate the mechanism of formation in rutting and to obtain the corresponding guidance. The numerical simulation showed that all particles of the specimen tended to move away from the load location. The main cause of rutting formation was the eddy current flow of asphalt mastic driven by coarse aggregates. The aggregates with diameters ranging from 9.5 to 4.75 mm were observed to have the greatest contribution to rutting deformation. Therefore, the aggregate amount of these spans should be focused on in the design of mixture grading.

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Section: Analysis and Discussionmentioning

confidence: 75%

Investigation on the Micro Deformation Mechanism of Asphalt Mixtures under High Temperatures Based on a Self-Developed Laboratory Test

Guo

Meng

et al. 2020

Materials

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“…As shown in Figure 10, the CT index of sample 1 is bigger than that of sample 3 which means that SMA-13 mixture has slower crack propagation rate than the SUP-13 mixture. The reason for this phenomenon is because the SMA asphalt mixture is a kind of mixture that has a dense skeleton structure [33] and the coarse aggregates inside the SMA mixtures are more than the fine aggregate. The coarse aggregate could form a solid skeleton to disperse the stress when there is a force being added on the SMA asphalt mixtures.…”

Section: Effect Of Gradation Type On the Ideal Test Resultsmentioning

confidence: 99%

Comprehensive Study about Effect of Basalt Fiber, Gradation, Nominal Maximum Aggregate Size and Asphalt on the Anti-Cracking Ability of Asphalt Mixtures

Lou

Kang

et al. 2021

Applied Sciences

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There are many parameters that could affect the properties of asphalt mixtures, such as the fiber additive, gradation type, nominal maximum aggregate size (NMAS), and asphalt. To evaluate the influence of these factors on the crack resistance of asphalt mixture, 10 different types of asphalt mixtures were prepared. The indirect tensile asphalt cracking test (IDEAL-CT) and semi-circle bending test (SCB) were adopted to test the anti-cracking ability of the test samples. The parameters of these two test results were also used to conduct the correlation analysis to find the correlation between different parameters, and scanning electron microscope (SEM) test was also used to analyze the micro cracks of asphalt mixture. The results showed that basalt fiber could further enhance the anti-cracking ability of asphalt mixture. Stone matrix asphalt (SMA) showed better anti-cracking performance than Superpave (SUP) asphalt mixtures. The increase in the nominal maximum aggregate size could decrease the anti-cracking ability of asphalt mixtures. Styrene-Butadiene-Styrene (SBS) modified asphalt could better reinforce the anti-cracking ability than pure asphalt. The CTindex of IDEAL-CT test and Flexibility index (FI) value of SCB test results showed better correlation. This paper has certain significance in guiding the design of asphalt mixtures having good crack resistance.

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“…Recent studies of the load transfer mechanism in asphalt mixture focus on three aspects: contact mechanical behavior, contact force characteristics, and force chain characteristics. The research on contact mechanical behavior of asphalt mixture is mainly focused on analyzing the aggregate contact, such as aggregate contact zone [ 16 ], aggregate contact chain structure [ 2 , 17 , 18 , 19 ], and aggregate contact number characteristics [ 20 , 21 ]. For contact force characteristics, the most common studies are statistical analysis of contact force, including contact force distribution characteristics [ 9 , 22 , 23 ] and contact force evolution characteristics in the compaction process [ 5 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Review on Load Transfer Mechanisms of Asphalt Mixture Meso-Structure

Wang

Miao

et al. 2023

Materials

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Asphalt mixture is a skeleton filling system consisting of aggregate and asphalt binder. Its performance is directly affected by the internal load transfer mechanism of the skeleton filling system. It is significant to understand the load transfer mechanisms for asphalt mixture design and performance evaluation. The objective of this paper is to review the research progress of the asphalt mixture load transfer mechanism. Firstly, this paper summarizes the test methods used to investigate the load transfer mechanism of asphalt mixtures. Then, an overview of the characterization of load transfer mechanism from three aspects was provided. Next, the indicators capturing contact characteristics, contact force characteristics, and force chain characteristics were compared. Finally, the load transfer mechanism of asphalt mixtures under different loading conditions was discussed. Some recommendations and conclusions in terms of load transfer mechanism characterization and evaluation were given. The related work can provide valuable references for the study of the load transfer mechanism of asphalt mixtures.

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Meso-structural characteristics of asphalt mixture main skeleton based on meso-scale analysis

Cited by 39 publications

References 27 publications

Investigation on the Micro Deformation Mechanism of Asphalt Mixtures under High Temperatures Based on a Self-Developed Laboratory Test

Investigation on the Micro Deformation Mechanism of Asphalt Mixtures under High Temperatures Based on a Self-Developed Laboratory Test

Comprehensive Study about Effect of Basalt Fiber, Gradation, Nominal Maximum Aggregate Size and Asphalt on the Anti-Cracking Ability of Asphalt Mixtures

Review on Load Transfer Mechanisms of Asphalt Mixture Meso-Structure

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