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Jiang Bian

Bio: Jiang Bian is an academic researcher from Nanjing Tech University. The author has contributed to research in topics: Asphalt & Medicine. The author has an hindex of 2, co-authored 2 publications receiving 8 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the micro-cracking behavior of asphalt mixtures in the indirect tensile test (IDT) was studied by the discrete element modeling in a user-defined discrete element model.

13 citations

Journal ArticleDOI
TL;DR: In this paper, an explicit finite element method for the modeling of ultrasonic wave propagation through asphalt concrete is presented, based on acoustic information (wave velocity) obtained in non-destructive testing (NDT) and density, the dynamic moduli of these asphalt concretes were evaluated and used in numerical modeling of ultra-frequency wave propagation using the commercial software package ABAQUS.
Abstract: Non-destructive ultrasonic testing has attained popularity due to its robustness and cost-effectiveness in monitoring the structural health and performance evaluation of pavements, thus replacing traditional methods. This paper presents the application of an explicit finite element method for the modeling of ultrasonic wave propagation through asphalt concrete. Prior to modeling, non-destructive ultrasonic testing was conducted on four different types of asphalt concrete (AC-13, SMA-13, AC-20, and AM-20). Based on acoustic information (wave velocity) obtained in non-destructive testing (NDT) and density, the dynamic moduli of these asphalt concretes were evaluated and used in numerical modeling of ultrasonic wave propagation using the commercial software package ABAQUS. The ultrasonic wave results obtained by numerical modeling were compared with experimental results. This comparison showed a good fit between the finite element (FE) results and the experimental results and confirmed a good FE approach for ultrasonic wave propagation. In addition, the influence of varying dynamic moduli, density, varying location, and crack size/depth on ultrasonic wave propagation was analyzed.

5 citations

Journal ArticleDOI
TL;DR: In this paper , a three-dimensional meso-structure discrete element model of asphalt pavement was generated with the FISH programming language and its mesomechanical response under vehicle load was analyzed.
Abstract: Numerical simulation is an effective way to study the mechanical response of asphalt pavement, which is very important for the pavement structural design. In this study, a three-dimensional meso-structure discrete element model of asphalt pavement was generated with the FISH programming language and its meso-mechanical response under vehicle load was analyzed. The contact forces within the asphalt pavement, in asphalt mastic, in coarse aggregates and between asphalt mastic and coarse aggregates were studied. The results of the study show that the contact forces within the asphalt mixture are highly uneven. The number of contact points in coarse aggregates account only for about 10% of all contact points while the sum of the contact forces in coarse aggregates contributes to over 50% of all contact forces. This demonstrates that the coarse aggregates bear most of the vehicle load. The average normal contact force in coarse aggregates is about 5 N and the average tangential contact force in coarse aggregates is about 2 N. The modeling results provide a quantitative understanding of the distribution of loading in asphalt pavement.

1 citations

Journal ArticleDOI
TL;DR: In this article , a series of tests were conducted using the bender element apparatus, and the influences of fines content (FC), relative density (Dr), and effective confining pressure (σ′3c) were taken into consideration.
Abstract: To study the small strain shear modulus (Gmax) of saturated sand-silt mixed soil materials, a series of tests were conducted using the bender element apparatus, and the influences of fines content (FC), relative density (Dr), and effective confining pressure (σ′3c) were taken into consideration. The test results indicate that the Gmax of the mixed soil materials decreases first and then increases with the FC up to 100% with Dr = 35% and 50%, while the Gmax decreases with the increasing FC when Dr = 60%. Moreover, for a given Dr, the Gmax increases with the increasing σ′3c, and the increase rate keeps constant under various FCs. The Gmax of specimens under various FCs decreases with the increase of the void ratio (e). The decrease rate between the Gmax and e differs when the σ′3c is given, which is influenced by the FC. The Gmax of the mixed soil materials can be evaluated by the Hardin model when the FC is determined. The best-fitting parameter A of the Hardin model first decreases and then increases as FC increases. The revised Hardin model, considering the influence of FC, σ′3c, and e, can be used to evaluate the Gmax for different types of sand-silt mixed soil materials. The error between the evaluated and tested Gmax is less than 10%.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a self-developed triaxial test method was adopted to characterize mechanical behavior of the asphalt mixture under three-dimensional stress states in a linear engineering model of asphalt mixture in σ oct - τ oct space.

19 citations

Journal ArticleDOI
TL;DR: In this paper, a relationship between the degree of compaction and the shear strength of soil (cohesion c and frictional angle ϕ) was established through indoor experiments, and the acceleration intelligent compaction value was proposed for a compaction meter value that indicates poor accuracy.
Abstract: During the compaction of a road subgrade, the mechanical parameters of the soil mass change in real time, but current research assumes that these parameters remain unchanged. In order to address this discrepancy, this paper establishes a relationship between the degree of compaction K and strain e. The relationship between the compaction degree K and the shear strength of soil (cohesion c and frictional angle ϕ) was clearly established through indoor experiments. The subroutine UMAT in ABAQUS finite element numerical software was developed to realize an accurate calculation of the subgrade soil compaction quality. This value was compared and analyzed against the assumed compaction value of the model, thereby verifying the accuracy of the intelligent compaction calculation results for subgrade soil. On this basis, orthogonal tests of the influential factors (frequency, amplitude, and quality) for the degree of compaction and sensitivity analysis were carried out. Finally, the ‘acceleration intelligent compaction value’, which is based on the acceleration signal, is proposed for a compaction meter value that indicates poor accuracy. The research results can provide guidance and basis for further research into the accurate control of compaction quality for roadbeds and pavements.

12 citations

Journal ArticleDOI
TL;DR: In this article, the facture failure of asphalt concrete at low temperature is considered as one of the main deterioration modes for asphalt pavement and experimental tests and heterogeneous simulations are combined.
Abstract: The facture failure of asphalt concrete at low temperature is one of the main deterioration modes for asphalt pavement. This study combines experimental tests and heterogeneous simulations ...

12 citations

Journal ArticleDOI
TL;DR: In this article, the authors combined forward ray tracing and synthetic aperture focusing technique (RF-SAFT) for the detection of void disease in ballastless track with multi-layer concrete structure.

9 citations

Journal ArticleDOI
TL;DR: In this article , a virtual approach for the thermal stress restrained specimen test (TSRST) was established based on the discrete element method (DEM) and the simulation software particle flow code in two-dimensional (PFC2D).

8 citations