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学者姓名：张金喜
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摘要 ：
The aim of this study is to investigate the influence of interface conditions on a backcalculated layer property for a flexible pavement with different base types. The simple friction model was utilized in the finite-element method (FEM) to simulate the interface condition, and four interface conditions were taken into account in analyses. The computed deflection time history indicated that the inadequate interface condition between the surface and base lead to the higher deflection peak for the pavement with a cement-treated base (CTB) and granular base (GB), while the interface condition between the base and subgrade has a significant influence on the deflection only for the pavement with a GB. The deflection time-history was backcalculated through a dynamic approach using the spectral element method (SEM) as a forward analysis engine in which the layers were treated as fully bonded. The results show that the interface condition shows an apparent influence on the backcalculated layer property. Due to the different contributions of each layer to the overall loading carrying capacity, the interface condition influence was different for different pavement scenarios, which should be appropriately considered for backcalculation and pavement evaluation. (C) 2021 American Society of Civil Engineers.
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| GB/T 7714 | Cao, Dandan , Zhao, Yanqing , Zhang, Jinxi et al. Investigation of the Interface Condition Influence on Backcalculated Layer Properties [J]. | JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS , 2021 , 147 (3) . |
| MLA | Cao, Dandan et al. "Investigation of the Interface Condition Influence on Backcalculated Layer Properties" . | JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS 147 . 3 (2021) . |
| APA | Cao, Dandan , Zhao, Yanqing , Zhang, Jinxi , Jing, Peng , Yao, Hui . Investigation of the Interface Condition Influence on Backcalculated Layer Properties . | JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS , 2021 , 147 (3) . |
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摘要 ：
The prediction of additional stresses in ballasted track due to subgrade deformation is the main objective of the present paper. In this context, a 2D finite element model of ballasted railway track was built using the ANSYS Workbench program. Based on this model, an investigation of stresses and deformation values of track elements was conducted in three cases with different contact types. It was found that the case introducing the status of a new track, which has frictional contacts between sleepers and ballast with bonded contacts between other elements, has lower stresses in most of the track elements. Moreover, this case was applied for studying the effect of the settlement on track elements. It was found that stresses increased with increasing the settlement value. The average percentages of increased stresses are 4.18%, 5.85%, and 7.21% in railhead, tie plate, and sleeper, respectively, due to a 1 mm increase in the settlement. Finally, a second-degree polynomial equation was derived to predict the additional stresses in each element due to track settlement. It is expected that this study would help to decrease the maintenance costs and extend the service life of the track elements by predicting the additional stresses in them.
关键词 ：
additional stress additional stress ballasted track ballasted track FEM FEM subgrade settlement subgrade settlement track element track element
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| GB/T 7714 | Ramadan, Ahmed Nabil , Jing, Peng , Zhang, Jinxi et al. Numerical Analysis of Additional Stresses in Railway Track Elements Due to Subgrade Settlement Using FEM Simulation [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (18) . |
| MLA | Ramadan, Ahmed Nabil et al. "Numerical Analysis of Additional Stresses in Railway Track Elements Due to Subgrade Settlement Using FEM Simulation" . | APPLIED SCIENCES-BASEL 11 . 18 (2021) . |
| APA | Ramadan, Ahmed Nabil , Jing, Peng , Zhang, Jinxi , Zohny, Haytham Nour EL-Din . Numerical Analysis of Additional Stresses in Railway Track Elements Due to Subgrade Settlement Using FEM Simulation . | APPLIED SCIENCES-BASEL , 2021 , 11 (18) . |
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摘要 ：
The influences and mechanisms of single and coupled effect of carbonation, dry-wet cycles and freeze–thaw cycles on the durability of three types of recycled aggregate concrete were studied. The compressive strength, chloride ion migration coefficient and micro pore parameters of recycled aggregate concrete were tested. The results showed that carbonation and dry-wet cycles can improve the pore tortuosity and reduce the connectivity of pores, while freeze–thaw cycles, coupling of carbonation and freeze–thaw cycles, and coupling of carbonation, dry-wet cycles and freeze–thaw cycles can significantly reduce the pore tortuosity and deteriorate the pore structure. The key reason for durability failure of recycled aggregate concrete in a complex environment is the increase of large pore volume fraction. When more factors are coupled, the increase in the pore volume fraction is greater. Based on the pore tortuosity and large pore volume fraction, an integrated pore index was proposed, and a prediction model of compressive strength and chloride ion migration coefficient of recycled aggregate concrete under complex environmental factors was established, which provided the basis to evaluate and maintain the durability of recycled aggregate concrete. © 2020 Elsevier Ltd
关键词 ：
Aggregates Aggregates Carbonation Carbonation Chlorine compounds Chlorine compounds Compressive strength Compressive strength Concrete aggregates Concrete aggregates Concretes Concretes Durability Durability Pore structure Pore structure Predictive analytics Predictive analytics Recycling Recycling Thawing Thawing Volume fraction Volume fraction
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| GB/T 7714 | Wang, Jiangang , Zhang, Jinxi , Cao, Dandan . Pore characteristics of recycled aggregate concrete and its relationship with durability under complex environmental factors [J]. | Construction and Building Materials , 2021 , 272 . |
| MLA | Wang, Jiangang et al. "Pore characteristics of recycled aggregate concrete and its relationship with durability under complex environmental factors" . | Construction and Building Materials 272 (2021) . |
| APA | Wang, Jiangang , Zhang, Jinxi , Cao, Dandan . Pore characteristics of recycled aggregate concrete and its relationship with durability under complex environmental factors . | Construction and Building Materials , 2021 , 272 . |
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摘要 ：
The effect of different aggregate treatment methods on the properties of both the recycled aggregate and the recycled concrete was studied. In this work, the compressive strength, dynamic elastic modulus, dry shrinkage rate, and chloride ion migration coefficient for five types of recycled concretes were investigated. Moreover, the Vickers hardness index and micro-morphology of new and old interfaces were analyzed. The results showed that "carbonation" significantly improved the mechanical properties and the dry shrinkage resistance of the recycled concrete. However, "slurry wrapping" greatly enhanced the chloride ion penetration resistance. Different aggregate treatment methods had different mechanisms to strengthen the interface. The influence of "carbonation" on the old interfacial zones (ITZ) was more significant than that on the new ITZ. A contrary influence of the "slurry wrapping" on both old and new ITZs was observed. The old interface had an obvious effect on the compressive strength and dynamic elastic modulus, while the new interface with different treatments had a non-negligible influence on the chloride penetration resistance. Besides, in this study, two optimization methods were proposed based on the improvement of "carbonation" and "slurry wrapping" treatment, respectively. These optimized methods can further improve the quality of recycled aggregate and the performance of recycled concrete. (C) 2019 Elsevier Ltd. All rights reserved.
关键词 ：
Aggregate treatment Aggregate treatment Durability Durability Mechanical properties Mechanical properties Recycled concrete Recycled concrete Vickers hardness Vickers hardness
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| GB/T 7714 | Wang, Jiangang , Zhang, Jinxi , Cao, Dandan et al. Comparison of recycled aggregate treatment methods on the performance for recycled concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2020 , 234 . |
| MLA | Wang, Jiangang et al. "Comparison of recycled aggregate treatment methods on the performance for recycled concrete" . | CONSTRUCTION AND BUILDING MATERIALS 234 (2020) . |
| APA | Wang, Jiangang , Zhang, Jinxi , Cao, Dandan , Dang, Haixiao , Ding, Bo . Comparison of recycled aggregate treatment methods on the performance for recycled concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2020 , 234 . |
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摘要 ：
Road roughness is a significant index to evaluate driving comfort and safety. However, the evaluation commonly used both in China and abroad shows great subjectivity due to the lack of information about passengers' physiological responses. To make evaluation more objective and comprehensive, this research analyzes the change of various physiological indexes on different roughness conditions. The result indicates that road roughness has a definite impact on physiological indexes and there is a logarithmic relationship between the range of heart rate and the average of international roughness index (IRI), which shows that it is reasonable to use the combination of IRI and heart rate to reflect road comfort and safety.
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| GB/T 7714 | Zhang, Chen , Lu, Yang , Zhao, Wei et al. Study on the Applicability of Physiological Method for Evaluating Pavement Roughness [C] . 2019 : 905-915 . |
| MLA | Zhang, Chen et al. "Study on the Applicability of Physiological Method for Evaluating Pavement Roughness" . (2019) : 905-915 . |
| APA | Zhang, Chen , Lu, Yang , Zhao, Wei , Cao, Jiang , Rong, Jianguo , Ban, Xiaoyi et al. Study on the Applicability of Physiological Method for Evaluating Pavement Roughness . (2019) : 905-915 . |
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摘要 ：
The objectives of this study are to explore the mechanism of the self-healing or flow of asphalt binder on the surface of the aggregates and evaluate the contact angle between the asphalt binder and aggregates. The mastic samples (small size) were prepared with asphalt binder and fine aggregates of a small size (below 0.3 mm). The microscale dynamic X-ray tomography was used to observe the flow of asphalt binder in the mastic sample at 353.15 K (80 degrees C) using the Advanced Photon Source (APS) beamline 2-BM at Argonne National Laboratory. The activation energy for flow of the asphalt binder and the contact angle between the asphalt binder and aggregates were analyzed to explain the self-healing characteristics of the asphalt binder materials. The Molecular Dynamics (MD) method was employed to simulate the flow process of the molecules of asphalt binder at different temperatures and mimic the contact angle difference between the asphalt binder and aggregate models. Simultaneously, in the laboratory, the contact angle goniometer was selected to measure the contact angle between the asphalt binder droplet and aggregates at different temperatures. The results of tests and MD simulations show that (1) asphalt binder diffused after heating from the X-ray images, and the stages and mechanism of the flow process of asphalt binder on aggregates were investigated; (2) low contact angle was observed in the interface model of asphalt binder and aggregates at high temperatures using the MD method. The wetting condition changed from partial non-wetting to wetting after heating in the interface model; (3) contact angle results between the asphalt binder and aggregates demonstrated flow steps of the asphalt binder material. The test data was also compared with the MD simulation results at different temperatures. (C) 2019 Elsevier Ltd. All rights reserved.
关键词 ：
Asphalt binder Asphalt binder Contact angle Contact angle Flow Flow Molecular Dynamics (MD) Molecular Dynamics (MD)
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| GB/T 7714 | Yao, Hui , Dai, Qingli , You, Zhanping et al. Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2019 , 212 : 727-736 . |
| MLA | Yao, Hui et al. "Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method" . | CONSTRUCTION AND BUILDING MATERIALS 212 (2019) : 727-736 . |
| APA | Yao, Hui , Dai, Qingli , You, Zhanping , Zhang, Jinxi , Lv, Songtao , Xiao, Xianghui . Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method . | CONSTRUCTION AND BUILDING MATERIALS , 2019 , 212 , 727-736 . |
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摘要 ：
Concerning the overlap of ground penetrating radar (GPR) signal reflections at the different asphalt layers, which reduces the measurement accuracy of asphalt surface thickness, the WRELAX algorithm for time-delay estimation was adopted to analyze the air-launched GPR signal reflections with 1GHz center frequency for the purpose of improving the detection accuracy of thin-layer thickness of asphalt pavement, and simulation and field test were carried out to verify the effectiveness of the proposed method. The results show that (1) WRELAX time-delay estimation algorithm detects iteratively strong reflections and then subtract them from the original signal to reveal the weak reflections, thus protruding the time-delay and the amplitude; (2) WRELAX algorithm in 1GHz GPR signal processing can effectively detect thin-layer thickness of asphalt pavement, with relatively small variation ranges of estimation error; (3) WRELAX algorithm in 1GHz GPR signal processing is robust and is more effective than that in 2GHz GPR signal processing; and (4) the maximum relative estimation error of thin-layer thickness estimated by WRELAX algorithm is less than 5%, which meets the requirements for detection and evaluation of thin-layer thickness of asphalt pavement. © 2018, Editorial Department, Journal of South China University of Technology. All right reserved.
关键词 ：
Geophysical prospecting Geophysical prospecting Frequency estimation Frequency estimation Iterative methods Iterative methods Ground penetrating radar systems Ground penetrating radar systems Time delay Time delay Asphalt pavements Asphalt pavements Timing circuits Timing circuits Asphalt mixtures Asphalt mixtures Geological surveys Geological surveys Radar measurement Radar measurement
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| GB/T 7714 | Song, Bo , Zhang, Jinxi , Xue, Zhongjun et al. Asphalt Thin-Layer Thickness Detection Based on WRELAX Time-Delay Estimation Algorithm [J]. | Journal of South China University of Technology (Natural Science) , 2018 , 46 (11) : 132-141 . |
| MLA | Song, Bo et al. "Asphalt Thin-Layer Thickness Detection Based on WRELAX Time-Delay Estimation Algorithm" . | Journal of South China University of Technology (Natural Science) 46 . 11 (2018) : 132-141 . |
| APA | Song, Bo , Zhang, Jinxi , Xue, Zhongjun , Ye, Shengbo , Zhang, Tao . Asphalt Thin-Layer Thickness Detection Based on WRELAX Time-Delay Estimation Algorithm . | Journal of South China University of Technology (Natural Science) , 2018 , 46 (11) , 132-141 . |
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摘要 ：
In recent years, the production of construction waste is increasing, and its composition is complex, especially the high content of red brick, which leads to the obvious higher water absorption rate of recycled aggregates compared to natural aggregates. Therefore, the original concrete mix design method isn't applicable any more. On the other hand, there is no safe and cheap backfill material for the trenches after laying underground pipelines. In order to solve these problems, the present study utilizes Construction and Demolition Waste to develop a fully-recycled concrete, namely backfilling concrete, which is specially used for supporting the backfilling of trenches. The water absorption of recycled aggregate soaking in water for different durations is tested. Based on the growth law of the water absorption of recycled aggregate, the additional water consumption is determined for the recycled concrete mixing process. The workability, including slump and bleeding rate, and compressive strength of the backfilling concrete with 16 compositions with different cement-water ratio and sand rates are studied in the paper. An empirical formula pertaining to the consumption of mixing water is proposed, and the parameters in the Bolomey formula concerning the performance of aggregate are modified based on the method for designing the regular concrete. At last, the finite element analysis is carried out with ABAQUS for the new type of recycled concrete. Experimental and simulation results show that slump of the mixtures using 30-min water absorption of recycled aggregates as additional water is around 10 cm, and the workability meets the practical requirements. The compressive strength of the construction-waste-based concrete is between 1 and 3 MPa. And backfilling concrete can effectively protect the underground pipelines and road structure under the vehicle load according to the finite element analysis. Consequently, in this paper, the original concrete mix design method is improved and completed, which can be applied to ultra-low strength recycled concrete. The newly proposed backfilling concrete has good workability and mechanical properties for backfilling of trenches. Moreover, cement consumption of it is low to 50 kg/m(3), which meets both economic and environmental requirements. (C) 2018 Elsevier Ltd. All rights reserved.
关键词 ：
Cement-water ratio Cement-water ratio Compressive strength Compressive strength Construction waste Construction waste Sand rate Sand rate Water consumption Water consumption
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| GB/T 7714 | Zhang, J. X. , Wang, B. , Song, B. . Composition design and performance characterization of a novel backfilling concrete derived from urban construction waste [J]. | JOURNAL OF CLEANER PRODUCTION , 2018 , 190 : 508-516 . |
| MLA | Zhang, J. X. et al. "Composition design and performance characterization of a novel backfilling concrete derived from urban construction waste" . | JOURNAL OF CLEANER PRODUCTION 190 (2018) : 508-516 . |
| APA | Zhang, J. X. , Wang, B. , Song, B. . Composition design and performance characterization of a novel backfilling concrete derived from urban construction waste . | JOURNAL OF CLEANER PRODUCTION , 2018 , 190 , 508-516 . |
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摘要 ：
Asphalt pavement temperatures greatly influence on the bearing capacity and performance, especially in high-temperature season. 'I he variation rules of pavement temperatures under the high-temperature range affect the design and maintenance management of the asphalt pavement, as well as the accurate prediction for pavement temperatures. However, asphalt pavement temperature is greatly affected by various strongly correlated environmental factors and cannot be measured directly or predicted effectively. In this project, temperature sensors were embedded in the pavement of in-service road to collect temperature data by continuous record measurement, and regression model was conducted by the partial least squares method through comprehensive analysis on the pavement temperature data and synchronously environmental data from local weather station measured in July 2013, July 2014, and July 2015. The quantitative relationships in high-temperature season between environmental factors and pavement temperature were determined, and a model was established to predict the temperature of asphalt pavement based on environmental data. The model was verified by the recorded data from July 1, 2016, to July 31, 2016, and the results indicated that the pavement temperature can be predicted accurately and reliably by the proposed model.
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| GB/T 7714 | Jing Chao , Zhang Jinxi . Prediction Model for Asphalt Pavement Temperature in High-Temperature Season in Beijing [J]. | ADVANCES IN CIVIL ENGINEERING , 2018 , 2018 . |
| MLA | Jing Chao et al. "Prediction Model for Asphalt Pavement Temperature in High-Temperature Season in Beijing" . | ADVANCES IN CIVIL ENGINEERING 2018 (2018) . |
| APA | Jing Chao , Zhang Jinxi . Prediction Model for Asphalt Pavement Temperature in High-Temperature Season in Beijing . | ADVANCES IN CIVIL ENGINEERING , 2018 , 2018 . |
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摘要 ：
Sixteen controlled low-strength material (CLSM) mixtures with various cement-to-sand (C/Sa) ratios and water-to-solid (W/So) ratios were prepared using recycled fine aggregate from urban red brick based construction waste. The fluidity and bleeding of the fresh CLSM mixtures were measured via the modified test methods, and the hardened CLSM mixtures were then molded to evaluate their compressive strength and durability. The results show that the fluidity of the fresh CLSM mixtures is 105 to 227 mm with the corresponding bleeding rate of 3.7% to 15.5%, which increases with the increase in fluidity. After aging for 28 d, the compressive strength of the hardened CLSM mixtures reaches 1.15 to 13.96 MPa, and their strength can be further enhanced with longer curing ages. Additionally, the strength increases with the increase of the C/Sa ratio, and decreases with the increase of the W/So ratio under the same curing age. Based on the obtained compressive strength, a fitting model for accurately predicting the compressive strength of the CLSM mixtures was established, which takes into account the above two independent variables (C/Sa and W/So ratios). Moreover, the durability of the hardened CLSM mixtures is enhanced for samples with higher C/Sa ratios. © 2017, Editorial Department of Journal of Southeast University. All right reserved.
关键词 ：
Aggregates Aggregates Brick Brick Compressive strength Compressive strength Curing Curing Durability Durability Fluidity Fluidity Hardening Hardening Mixtures Mixtures Recycling Recycling Testing Testing
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| GB/T 7714 | Ran, Jin , Zhang, Jinxi , Yang, Mijia et al. Controlled low-strength material incorporating recycled fine aggregate from urban red brick based construction waste [J]. | Journal of Southeast University (English Edition) , 2017 , 33 (4) : 496-501 . |
| MLA | Ran, Jin et al. "Controlled low-strength material incorporating recycled fine aggregate from urban red brick based construction waste" . | Journal of Southeast University (English Edition) 33 . 4 (2017) : 496-501 . |
| APA | Ran, Jin , Zhang, Jinxi , Yang, Mijia , Jia, Dongdong , Lu, Shengdi . Controlled low-strength material incorporating recycled fine aggregate from urban red brick based construction waste . | Journal of Southeast University (English Edition) , 2017 , 33 (4) , 496-501 . |
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