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Hui Yao
Beijing Key Laboratory of Traffic Engineering, Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing, China

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Journal article
Published: 10 May 2021 in Scientific Reports
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Asphalt binder is the main material for road pavement and building construction. It is a complex mixture composed of a large number of hydrocarbons with different molecular weights. The study of asphalt binders and asphalt concretes from a molecular perspective is an important means to understand the intricate properties of asphalt. Molecular dynamics simulation is based on Newton’s law and predicts the microscopic performance of materials by calculating the intra- and intermolecular interactions. The asphalt binder can be divided into four components: saturates, aromatics, resins, and asphaltenes (SARA). A new molecular model of asphalt was proposed and verified in this study. Eight molecules selected from the literature were used to represent the four components of asphalt. The AMBER Cornell Extension Force Field was applied in this study to model building and the calculation of properties. The density of the asphalt model was calculated and compared with experimental results for validity verifications. The results show that the purposed model can be used to calculate the microscopic properties of the asphalt binder because the density of the model is close to the real value in the field. Besides, the proportions of different molecules in the model were adjusted to predict the relationship between the asphalt binder density and the hydrocarbon ratios and heteroatom contents of the molecular model. Moreover, the glass transition temperature of the asphalt binder model is predicted by the simulation of the heating process. The range of the glass transition temperature is determined by calculating the relationship between specific volume and temperature, and the calculated range is close to the experimental value.

ACS Style

Hui Yao; Junfu Liu; Mei Xu; Andreas Bick; Qing Xu; Jinxi Zhang. Generation and properties of the new asphalt binder model using molecular dynamics (MD). Scientific Reports 2021, 11, 1 -15.

AMA Style

Hui Yao, Junfu Liu, Mei Xu, Andreas Bick, Qing Xu, Jinxi Zhang. Generation and properties of the new asphalt binder model using molecular dynamics (MD). Scientific Reports. 2021; 11 (1):1-15.

Chicago/Turabian Style

Hui Yao; Junfu Liu; Mei Xu; Andreas Bick; Qing Xu; Jinxi Zhang. 2021. "Generation and properties of the new asphalt binder model using molecular dynamics (MD)." Scientific Reports 11, no. 1: 1-15.

Original research article
Published: 05 April 2021 in Frontiers in Materials
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The objective of this study is to investigate the compaction characteristics of cold recycled mixtures with asphalt emulsion (CRME) using the Superpave gyratory compactor (SGC) method. Five characteristic parameters were proposed and calculated including the compaction energy index, the compaction energy index, three compaction energy indicators at different compaction stages. The influence of these parameters and material compositions were analyzed for the pavement performance. The difference between SGC and Marshall double-sided compaction/heavy compaction method was compared. The results show that the proposed parameters can better reflect the compaction characteristics of CRME, and the mixture effect with SGC of 50 gyrations was close to that with 75 blows using the Marshall compaction. The asphalt emulsion contents and compaction temperatures had a significant effect on compaction characteristics, but the effect of aggregate gradations was not significant. The appropriate asphalt emulsion and the new aggregate content can increase the capability of the CRME to resist the permanent deformation. The optimum mixing water content of CRME obtained by the SGC method was reduced by 18%, but the density increased by 3.5%, compared with the heavy compaction method. Finally, a new idea to determine the optimum emulsified asphalt content of CRME was provided through analyzing the compaction characteristic parameters.

ACS Style

Decai Wang; Hui Yao; Jinchao Yue; Shengneng Hu; Junfu Liu; Mei Xu; Siyu Chen. Compaction Characteristics of Cold Recycled Mixtures with Asphalt Emulsion and Their Influencing Factors. Frontiers in Materials 2021, 8, 1 .

AMA Style

Decai Wang, Hui Yao, Jinchao Yue, Shengneng Hu, Junfu Liu, Mei Xu, Siyu Chen. Compaction Characteristics of Cold Recycled Mixtures with Asphalt Emulsion and Their Influencing Factors. Frontiers in Materials. 2021; 8 ():1.

Chicago/Turabian Style

Decai Wang; Hui Yao; Jinchao Yue; Shengneng Hu; Junfu Liu; Mei Xu; Siyu Chen. 2021. "Compaction Characteristics of Cold Recycled Mixtures with Asphalt Emulsion and Their Influencing Factors." Frontiers in Materials 8, no. : 1.

Research article
Published: 29 December 2020 in Advances in Civil Engineering
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The property of asphalt binder plays an important role in the performance of asphalt mixture. The natural rubber additive (NRA) was recommended as a modifier in the preparation of high viscosity asphalt (HVA) binder. Then, the gradation named LASTIKA-13 was adopted to design the high viscosity asphalt mixture (HVAM) according to the orthogonal test analysis and the optimized gradation. The performance of the proposed HVAM was evaluated through a series tests including the permanent deformation at high temperature, moisture stability, low-temperature cracks, and bending fatigue test. The results indicate that the proposed modified asphalt binder shows a comparable property with the conventional modified asphalt binder. The proposed HVAM with the NRA modifier has a superior performance to other conventional mixtures in the temperature susceptibility and resistance to moisture damage. Furthermore, the proposed HVAM was less sensitive to the temperature change and has good performance in terms of resistance to low-temperature cracks, bonding characteristics, and fatigue behaviors.

ACS Style

Xudong Hu; Sheng Li; Hui Yao; Hui Wang; Mei Xu; Dandan Cao; Mohd Rosli Mohd Hasan; Cong Duan; Ran Zhang. Gradation Design and Performance Evaluation of High Viscosity Asphalt Mixtures. Advances in Civil Engineering 2020, 2020, 1 -14.

AMA Style

Xudong Hu, Sheng Li, Hui Yao, Hui Wang, Mei Xu, Dandan Cao, Mohd Rosli Mohd Hasan, Cong Duan, Ran Zhang. Gradation Design and Performance Evaluation of High Viscosity Asphalt Mixtures. Advances in Civil Engineering. 2020; 2020 ():1-14.

Chicago/Turabian Style

Xudong Hu; Sheng Li; Hui Yao; Hui Wang; Mei Xu; Dandan Cao; Mohd Rosli Mohd Hasan; Cong Duan; Ran Zhang. 2020. "Gradation Design and Performance Evaluation of High Viscosity Asphalt Mixtures." Advances in Civil Engineering 2020, no. : 1-14.

Research article
Published: 21 December 2020 in Advances in Civil Engineering
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The clump-based discrete element model is one of the asphalt mixture simulation methods, which has the potential to not only predict mixture performance but also simulate particle movement during compaction, transporting, and other situations. However, modelling of asphalt sand mortar in this method remains to be a problem due to computing capacity. Larger-sized balls (generally 2.0–2.36 mm) were usually used to model the smaller particles and asphalt binder, but this replacement may result in the mixture’s unrealistic volumetric features. More specifically, replacing original elements with equal volume but larger size particles will increase in buck volume and then different particle contacting states. The major objective of this research is to provide a solution to the dilemma situation through an improved equivalent model of the smaller particles and asphalt binders. The key parameter of the equivalent model is the diameter reduction factor (DRF), which was proposed in this research to minimize the effects of asphalt mortar’s particle replacement modelling. To determine DRF, the DEM-based analysis was conducted to evaluate several mixture features, including element overlap ratio, ball-wall contact number, and the average wall stress. Through this study, it was observed that when the original glued ball diameters are ranging from 2.00 mm and 2.36 mm, the diameter reduction factor changes from 0.82 to 0.86 for AC mixtures and 0.80 to 0.84 for SMA mixtures. The modelling method presented in this research is suitable not only for asphalt mixtures but also for the other particulate mix with multisize particles.

ACS Style

Yu Liu; Peifeng Su; Miaomiao Li; Hui Yao; Junfu Liu; Mei Xu; Xiaodong Zhou; Zhanping You. How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar. Advances in Civil Engineering 2020, 2020, 1 -10.

AMA Style

Yu Liu, Peifeng Su, Miaomiao Li, Hui Yao, Junfu Liu, Mei Xu, Xiaodong Zhou, Zhanping You. How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar. Advances in Civil Engineering. 2020; 2020 ():1-10.

Chicago/Turabian Style

Yu Liu; Peifeng Su; Miaomiao Li; Hui Yao; Junfu Liu; Mei Xu; Xiaodong Zhou; Zhanping You. 2020. "How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar." Advances in Civil Engineering 2020, no. : 1-10.

Journal article
Published: 01 November 2020 in Journal of Materials in Civil Engineering
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The goal of this paper is to reveal the influence of temperatures on the triaxial strength of asphalt mixtures. The triaxial compression and triaxial tensile tests, as well as plane tensile and compression/axial tensile tests, which were developed by the self-developed triaxial test equipment to carry out the complex stress state under different temperatures (5°C, 10°C, 15°C, 20°C, and 25°C), were performed on the asphalt mixture. The ultimate failure strength of the material shows that the temperature and stress state significantly affect the triaxial strength characteristics of the asphalt mixture, and the three-dimensional strength decreases by the increase in temperature. Under the triaxial compression and triaxial tensile stress state, the resistance of the octahedral shear stress increases with the hydrostatic stress. A three-dimensional strength calculation model is established based on the influence of temperature and characterization by the tensile meridian, compression meridian, and failure strength envelope. It reveals the change of failure strength envelope with increasing temperatures and decreasing hydrostatic stress under complex stress state. It provides experimental and theoretical references to the design of asphalt pavement structure of different temperature conditions according to the three-dimensional stress state.

ACS Style

Tuo Huang; Mi Li; Yi Yang; Jing Xie; Hongfu Liu; Hui Yao; Qing Xu; Shuai Qi. Unified Strength Models of an Asphalt Mixture under Different Temperatures and Three-Dimensional Stresses. Journal of Materials in Civil Engineering 2020, 32, 04020335 .

AMA Style

Tuo Huang, Mi Li, Yi Yang, Jing Xie, Hongfu Liu, Hui Yao, Qing Xu, Shuai Qi. Unified Strength Models of an Asphalt Mixture under Different Temperatures and Three-Dimensional Stresses. Journal of Materials in Civil Engineering. 2020; 32 (11):04020335.

Chicago/Turabian Style

Tuo Huang; Mi Li; Yi Yang; Jing Xie; Hongfu Liu; Hui Yao; Qing Xu; Shuai Qi. 2020. "Unified Strength Models of an Asphalt Mixture under Different Temperatures and Three-Dimensional Stresses." Journal of Materials in Civil Engineering 32, no. 11: 04020335.

Research article
Published: 10 December 2019 in Advances in Civil Engineering
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This study presented the preparation and performance of a kind of high viscosity and elastic recovery asphalt (HVERA) by using some modifiers. The performance of styrene-butadiene-styrene (SBS), rock asphalt (RA), crumb rubber (CR), and stabilizing agent (SA) for different modifiers was investigated by conventional binder test. Effects of modifiers on the high- and low-temperature properties of HVERA were investigated. The dynamic viscosity (DV) test, dynamic shear rheometer (DSR), and bending beam rheometer (BBR) analysis indicated that the high- and low-temperature rheological properties of asphalt were improved attribute to the addition of mixture of modifiers. Meanwhile, the short-term aging and long-term aging were simulated by rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. Furthermore, the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) measurements were conducted for obtaining the mechanism and microstructure distribution of the modified asphalt binders. From the test results in this study, it was evident that the addition of SBS, RA, CR, and SA into a neat asphalt binder could both significantly improve the viscosity of the binder at high temperature and lower the creep stiffness at low temperature, which was beneficial to better both high-temperature stability and low-temperature cracking resistance of asphalt pavements. It was proved that the high temperature grade of HVERA could be increased by increasing of RA and a proper percentage of modifiers could be improved by the low temperature grade of HVERA.

ACS Style

Liangchen Qu; Yingli Gao; Hui Yao; Dandan Cao; Ganpeng Pei; Bei He; Kairui Duan; Wenjuan Zhou. Preparation and Performance Analysis of High-Viscosity and Elastic Recovery Modified Asphalt Binder. Advances in Civil Engineering 2019, 2019, 1 -16.

AMA Style

Liangchen Qu, Yingli Gao, Hui Yao, Dandan Cao, Ganpeng Pei, Bei He, Kairui Duan, Wenjuan Zhou. Preparation and Performance Analysis of High-Viscosity and Elastic Recovery Modified Asphalt Binder. Advances in Civil Engineering. 2019; 2019 ():1-16.

Chicago/Turabian Style

Liangchen Qu; Yingli Gao; Hui Yao; Dandan Cao; Ganpeng Pei; Bei He; Kairui Duan; Wenjuan Zhou. 2019. "Preparation and Performance Analysis of High-Viscosity and Elastic Recovery Modified Asphalt Binder." Advances in Civil Engineering 2019, no. : 1-16.

Journal article
Published: 01 July 2019 in Journal of Materials in Civil Engineering
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This paper investigates the effects of different aging temperatures on the performance of asphalt binders through a comprehensive experimental procedure. Two kinds of asphalt binders with the same 70/100 penetration grade were used in this study. The two types of asphalt binders were short-term aged at three different temperatures: 123°C, 143°C, and 163°C. The short-term aged asphalt binders were long-term aged according to the standard pressure aging vessel (PAV) tests protocol. Dynamic shear rheometer (DSR) and Fourier-transform infrared spectroscopy (FTIR) were adopted to quantify the performance of asphalt binders under different aging conditions. The DSR results showed that different critical aging temperatures can be found for the two kinds of asphalt binders. The Superpave performance grading can reflect the viscoelastic property of asphalt binder, whereas penetration grading cannot do so in grading asphalt binder. The FTIR test results showed that the Ic═o and Is═o bonds were good indicators to evaluate the aging effect of different temperatures. The correlation between |G*| and IC═O+IS═O occurred for both asphalt binders under different aging conditions.

ACS Style

Dongdong Ge; Siyu Chen; Zhanping You; Xu Yang; Hui Yao; Mingxiao Ye; Yoke Khin Yap. Correlation of DSR Results and FTIR’s Carbonyl and Sulfoxide Indexes: Effect of Aging Temperature on Asphalt Rheology. Journal of Materials in Civil Engineering 2019, 31, 04019115 .

AMA Style

Dongdong Ge, Siyu Chen, Zhanping You, Xu Yang, Hui Yao, Mingxiao Ye, Yoke Khin Yap. Correlation of DSR Results and FTIR’s Carbonyl and Sulfoxide Indexes: Effect of Aging Temperature on Asphalt Rheology. Journal of Materials in Civil Engineering. 2019; 31 (7):04019115.

Chicago/Turabian Style

Dongdong Ge; Siyu Chen; Zhanping You; Xu Yang; Hui Yao; Mingxiao Ye; Yoke Khin Yap. 2019. "Correlation of DSR Results and FTIR’s Carbonyl and Sulfoxide Indexes: Effect of Aging Temperature on Asphalt Rheology." Journal of Materials in Civil Engineering 31, no. 7: 04019115.

Journal article
Published: 11 April 2019 in Construction and Building Materials
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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 °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.

ACS Style

Hui Yao; Qingli Dai; Zhanping You; Jinxi Zhang; Songtao Lv; Xianghui Xiao. Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method. Construction and Building Materials 2019, 212, 727 -736.

AMA Style

Hui Yao, Qingli Dai, Zhanping You, Jinxi Zhang, Songtao Lv, Xianghui Xiao. Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method. Construction and Building Materials. 2019; 212 ():727-736.

Chicago/Turabian Style

Hui Yao; Qingli Dai; Zhanping You; Jinxi Zhang; Songtao Lv; Xianghui Xiao. 2019. "Evaluation of contact angle between asphalt binders and aggregates using Molecular Dynamics (MD) method." Construction and Building Materials 212, no. : 727-736.

Research article
Published: 08 April 2019 in Advances in Civil Engineering
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The warm mix asphalt was fabricated with different moisture contents (0%, 1%, 2%, and 3%) of limestone aggregates using the Superpave gyratory compactor. The moisture susceptibility of asphalt mixtures with an organic wax additive RH was studied. The samples were compacted and tested using the modified Lottman test AASHTO T283, and the X-ray computed tomography technology was used to capture the internal structure images before and after the freeze-thaw cycles. The test results show that the air voids were distributed in the size range of 0–5 mm3 and 5–10 mm3. The number of air voids decreased with the increase of air void size and increased after freeze-thaw cycles. The air void content can be influenced by the residual moisture in aggregates. The higher the moisture content of aggregates is, the larger the air void content is. So, the air void content is likely to be sensitive to moisture damage. The increase ratio of the air void and moisture content of aggregates had good correlation with the indirect tensile strength and tensile strength ratio of the samples. The indirect tensile strength and tensile strength ratio of the samples decreased linearly, and the samples were sensitive to the moisture damage with the increases of increase ratio of the air void/moisture content in aggregates.

ACS Style

Jie Ji; Hui Yao; Zhikai Yuan; Zhi Suo; Ying Xu; Pengfei Li; Zhanping You. Moisture Susceptibility of Warm Mix Asphalt (WMA) with an Organic Wax Additive Based on X-Ray Computed Tomography (CT) Technology. Advances in Civil Engineering 2019, 2019, 1 -12.

AMA Style

Jie Ji, Hui Yao, Zhikai Yuan, Zhi Suo, Ying Xu, Pengfei Li, Zhanping You. Moisture Susceptibility of Warm Mix Asphalt (WMA) with an Organic Wax Additive Based on X-Ray Computed Tomography (CT) Technology. Advances in Civil Engineering. 2019; 2019 ():1-12.

Chicago/Turabian Style

Jie Ji; Hui Yao; Zhikai Yuan; Zhi Suo; Ying Xu; Pengfei Li; Zhanping You. 2019. "Moisture Susceptibility of Warm Mix Asphalt (WMA) with an Organic Wax Additive Based on X-Ray Computed Tomography (CT) Technology." Advances in Civil Engineering 2019, no. : 1-12.

Review
Published: 07 January 2019 in Construction and Building Materials
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The objectives of this review paper are to document current practices in wet-freeze climate zones and introduce emerging technologies that would be largely implemented in wet-freeze climate zones in the near future. A current practice is defined as a procedure that has been shown by research or experience to produce acceptable results and that is established or proposed as a standard suitable for widespread adaptation. An emerging technology is defined as a technique or a material that can improve the asphalt pavement performance, partly replace general materials, and contribute to more sustainable asphalt pavements. This review identified the criteria used to determine locations in the United States and two Canadian provinces with a similar wet-freeze climate. In addition, asphalt binders, asphalt additives/modifiers, asphalt mixture types, reclaimed asphalt mixtures, asphalt mixture test methods, asphalt mixture design methods, and deicers were reviewed. This review concluded with some recommendations in terms of using environmentally friendly materials and selecting cracking and rutting failure criteria to design asphalt mixtures with enhanced performance in wet-freeze climates.

ACS Style

Siyu Chen; Zhanping You; Naser P. Sharifi; Hui Yao; Fangyuan Gong. Material selections in asphalt pavement for wet-freeze climate zones: A review. Construction and Building Materials 2019, 201, 510 -525.

AMA Style

Siyu Chen, Zhanping You, Naser P. Sharifi, Hui Yao, Fangyuan Gong. Material selections in asphalt pavement for wet-freeze climate zones: A review. Construction and Building Materials. 2019; 201 ():510-525.

Chicago/Turabian Style

Siyu Chen; Zhanping You; Naser P. Sharifi; Hui Yao; Fangyuan Gong. 2019. "Material selections in asphalt pavement for wet-freeze climate zones: A review." Construction and Building Materials 201, no. : 510-525.

Journal article
Published: 15 November 2018 in Journal of Testing and Evaluation
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The objective of this research is to study the properties of waterborne epoxy–modified emulsified asphalt binder (WEMEAB). The WEMEAB was prepared with a method of preemulsification and modification. The optimum asphalt-water ratio (ratio of base asphalt binder to emulsifier), emulsifier content, and waterborne epoxy content were determined through an orthogonal test with three factors and three levels. Based on the penetration system, the high- and low-temperature properties and storage stability of WEMEAB were evaluated. The distribution of waterborne epoxy in the modified emulsified asphalt binder and the microstructure of WEMEAB were observed through the Fluorescence Optical Microscopy (FOM) and Atomic Force Microscopy (AFM) tests. The test results indicated that the high- and low-temperature properties of WEMEAB were noticeably improved and that the waterborne epoxy was distributed uniformly in the modified emulsified asphalt binder with an asphalt-water ratio of 65:35, 4 % waterborne epoxy and 1.4 % emulsifier. The FOM and AFM images showed that cross-linking and interpenetration network structure and “bee-like” structures had formed on the surface of the WEMEAB.

ACS Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Ying Xu; Song Han; Shifa Xu; Zhanping You. Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB). Journal of Testing and Evaluation 2018, 48, 1 .

AMA Style

Jie Ji, Hui Yao, Wenhua Zheng, Zhi Suo, Ying Xu, Song Han, Shifa Xu, Zhanping You. Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB). Journal of Testing and Evaluation. 2018; 48 (4):1.

Chicago/Turabian Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Ying Xu; Song Han; Shifa Xu; Zhanping You. 2018. "Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB)." Journal of Testing and Evaluation 48, no. 4: 1.

Article
Published: 03 September 2018 in Journal of Applied Polymer Science
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The performance and modification mechanism of Buton rock asphalt (BRA) modified asphalt were analyzed. The road performance of modified asphalt was observed and compared with SBS modified asphalt to confirm the modification mechanism. Four‐component test, and dynamic shear rheological tests were conducted to identify the performance of modified asphalt. Fourier transform infrared spectroscopy was carried out to analyze the modification mechanism of modified asphalt. Finally, the rutting, low‐temperature bending beam failure, and freeze–thaw splitting tests were used to evaluate the high‐temperature performance, low‐temperature cracking resistance, and water stability performance of mixtures, respectively. The results show that the high‐temperature performance of asphalt can be improved by BRA with asphaltene and resin increased. It is likely that there is no new functional group generated and this process was physical changes mainly. The honeycomb structure of BRA ashes/particles increased the contact area between the base asphalt and BRA ashes/particles, which makes the asphalt change from the homogeneous body into a two‐phase continuous structure system. Consequently, the adhesion between asphalt and BRA ashes/particles was enhanced, and the dynamic stability, bending coefficient and splitting strength ratio were improved. It indicates that the test results of asphalt mixtures verified the modification effect of BRA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46903.

ACS Style

Songtao Lv; Xiyan Fan; Hui Yao; Lingyun You; Zhanping You; Guopeng Fan. Analysis of performance and mechanism of Buton rock asphalt modified asphalt. Journal of Applied Polymer Science 2018, 136, 1 .

AMA Style

Songtao Lv, Xiyan Fan, Hui Yao, Lingyun You, Zhanping You, Guopeng Fan. Analysis of performance and mechanism of Buton rock asphalt modified asphalt. Journal of Applied Polymer Science. 2018; 136 (1):1.

Chicago/Turabian Style

Songtao Lv; Xiyan Fan; Hui Yao; Lingyun You; Zhanping You; Guopeng Fan. 2018. "Analysis of performance and mechanism of Buton rock asphalt modified asphalt." Journal of Applied Polymer Science 136, no. 1: 1.

Journal article
Published: 01 February 2018 in Construction and Building Materials
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ACS Style

Hui Yao; Qingli Dai; Zhanping You; Andreas Bick; Min Wang. Modulus simulation of asphalt binder models using Molecular Dynamics (MD) method. Construction and Building Materials 2018, 162, 430 -441.

AMA Style

Hui Yao, Qingli Dai, Zhanping You, Andreas Bick, Min Wang. Modulus simulation of asphalt binder models using Molecular Dynamics (MD) method. Construction and Building Materials. 2018; 162 ():430-441.

Chicago/Turabian Style

Hui Yao; Qingli Dai; Zhanping You; Andreas Bick; Min Wang. 2018. "Modulus simulation of asphalt binder models using Molecular Dynamics (MD) method." Construction and Building Materials 162, no. : 430-441.

Journal article
Published: 01 January 2018 in Construction and Building Materials
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ACS Style

Songtao Lv; Chaochao Liu; Hui Yao; Jianlong Zheng. Comparisons of synchronous measurement methods on various moduli of asphalt mixtures. Construction and Building Materials 2018, 158, 1035 -1045.

AMA Style

Songtao Lv, Chaochao Liu, Hui Yao, Jianlong Zheng. Comparisons of synchronous measurement methods on various moduli of asphalt mixtures. Construction and Building Materials. 2018; 158 ():1035-1045.

Chicago/Turabian Style

Songtao Lv; Chaochao Liu; Hui Yao; Jianlong Zheng. 2018. "Comparisons of synchronous measurement methods on various moduli of asphalt mixtures." Construction and Building Materials 158, no. : 1035-1045.

Journal article
Published: 10 November 2017 in Applied Sciences
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This paper aims to study the preparation and viscoelastic properties of asphalt binder modified by tetrahydrofuran soluble fraction (THFS) extracted from direct coal liquefaction residue. The modified asphalt binders, which blended with SK-90 (control asphalt binder) and 4%, 6%, 8% and 10% THFS (by weight of SK-90), were fabricated. The preparation process for asphalt binder was optimized in terms of the orthogonal array test strategy and gray correlation analysis results. The properties of asphalt binder were measured by applying Penetration performance grade and Superpave performance grade specifications. In addition, the temperature step and frequency sweep test in Dynamic Shear Rheometer were conducted to predict the rheological behavior, temperature and frequency susceptibility of asphalt binder. The test results suggested the optimal preparation process, such as 150 °C shearing temperature, 45 min shearing time and 4000 rpm shearing rate. Subsequently, the addition of THFS was beneficial in increasing the high-temperature properties but decreased the low-temperature properties and resistance to fatigue. The content analysis of THFS showed the percentage of 4~6% achieved a balance in the high-and-low temperature properties of asphalt binder. The asphalt binder with higher THFS content exhibited higher resistance to rutting and less sensitivity to frequency and temperature.

ACS Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Yuefeng Shi; Ying Xu; Hao Wu; Zhanping You. Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue. Applied Sciences 2017, 7, 1155 .

AMA Style

Jie Ji, Hui Yao, Wenhua Zheng, Zhi Suo, Yuefeng Shi, Ying Xu, Hao Wu, Zhanping You. Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue. Applied Sciences. 2017; 7 (11):1155.

Chicago/Turabian Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Yuefeng Shi; Ying Xu; Hao Wu; Zhanping You. 2017. "Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue." Applied Sciences 7, no. 11: 1155.

Journal article
Published: 01 September 2017 in Composites Part B: Engineering
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ACS Style

Shuaicheng Guo; Qingli Dai; Zigeng Wang; Hui Yao. Rapid microwave irradiation synthesis of carbon nanotubes on graphite surface and its application on asphalt reinforcement. Composites Part B: Engineering 2017, 124, 134 -143.

AMA Style

Shuaicheng Guo, Qingli Dai, Zigeng Wang, Hui Yao. Rapid microwave irradiation synthesis of carbon nanotubes on graphite surface and its application on asphalt reinforcement. Composites Part B: Engineering. 2017; 124 ():134-143.

Chicago/Turabian Style

Shuaicheng Guo; Qingli Dai; Zigeng Wang; Hui Yao. 2017. "Rapid microwave irradiation synthesis of carbon nanotubes on graphite surface and its application on asphalt reinforcement." Composites Part B: Engineering 124, no. : 134-143.

Original articles
Published: 19 March 2017 in Petroleum Science and Technology
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The objective of this study is to explore the self-healing process or diffusion of the asphalt materials on aggregates through the experiments and molecular dynamics (MD) simulations. The asphalt mastic samples were prepared with binders and fine aggregates. The microscale dynamic X-ray computed tomography was conducted to capture the self-diffusion process of the binder in the asphalt mastic controlled at 353.15 K using Advanced Photon Source beamline 2-BM. The Mean Square Displacements were analyzed to describe the self-healing behaviors of binders by an MD method. The results of tests and MD simulations show that the molecules of the asphalt model on the nanoscale at high temperatures move faster those at low temperatures. The asphalt molecules move forward to aggregate layer and expand contact area to reduce the system energy.

ACS Style

Hui Yao; Qingli Dai; Zhanping You. Investigation of the asphalt–aggregate interaction using molecular dynamics. Petroleum Science and Technology 2017, 35, 586 -593.

AMA Style

Hui Yao, Qingli Dai, Zhanping You. Investigation of the asphalt–aggregate interaction using molecular dynamics. Petroleum Science and Technology. 2017; 35 (6):586-593.

Chicago/Turabian Style

Hui Yao; Qingli Dai; Zhanping You. 2017. "Investigation of the asphalt–aggregate interaction using molecular dynamics." Petroleum Science and Technology 35, no. 6: 586-593.

Journal article
Published: 01 March 2017 in Journal of Materials in Civil Engineering
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Different modifiers composed of polyethylene glycol, paraformaldehyde, polystyrene, and polyphosphoric acid at different ratios (designated CD-0, CD-1, CD-2. CD-3, and CD-4) were added to coal tar pitch. The resulting modified pitches were prepared and designated control D-0 and D-1, D-2, D-3, and D-4, correspondingly. The objective of this study was to evaluate the properties of the control and modified coal tar pitches by the dynamic shear rheometer (DSR) test and microscopic imaging technology. The complex shear modulus G* and phase angle δ of the modified coal tar pitches decreased with increased temperature, which indicated a decline in the gradual capacity for resistance to permanent deformation at high temperatures. There was good correlation between the Christensen-Andersen-Marasteanu (CAM) model and the complex modulus master curve of the modified coal tar pitches. The test results showed that D-4 had a higher complex viscosity η* than that of the control D-0 and the other modified coal tar pitches (D-1, D-2, and D-3), along with a higher glassy complex modulus Gg*, cross frequency fc, rheological parameter r, and better resistance to rheological deformation. Control D-4 also had a strong capability to resist high-temperature permanent deformation. In addition, the homogeneity of D-4 was better than that of the control D-0 and the other modified pitches, as observed in microscopic images. Therefore, it could be concluded that D-4 had better properties compared with the others.

ACS Style

Jie Ji; Hui Yao; Zhi Suo; Haiyan Zhang; Dongwei Cao; Zhanping You; Baichang Li. Rheological Properties of Modified Coal Tar Pitches. Journal of Materials in Civil Engineering 2017, 29, D4016002 .

AMA Style

Jie Ji, Hui Yao, Zhi Suo, Haiyan Zhang, Dongwei Cao, Zhanping You, Baichang Li. Rheological Properties of Modified Coal Tar Pitches. Journal of Materials in Civil Engineering. 2017; 29 (3):D4016002.

Chicago/Turabian Style

Jie Ji; Hui Yao; Zhi Suo; Haiyan Zhang; Dongwei Cao; Zhanping You; Baichang Li. 2017. "Rheological Properties of Modified Coal Tar Pitches." Journal of Materials in Civil Engineering 29, no. 3: D4016002.

Journal article
Published: 01 March 2017 in Journal of Materials in Civil Engineering
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Traditional rejuvenators normally have a great deal of heavy fuel oils to supply the light oil component of asphalt binders, which decreases throughout a long-term aging process. However, heavy fuel oils can easily volatilize at a high recycling temperature (above 180°C), and this leads to a limited portion of reclaimed asphalt pavement (RAP) materials utilized in the recycled asphalt mixture (with a recycling rate less than 30%). Vegetable oils are rich in unsaturated fatty acids, which are similar to the light oil components, and have a better temperature resistance. Therefore, there is potential that vegetable oils can be utilized to recover the aged asphalt binder based on the asphalt rejuvenating mechanism. In this study, two rejuvenators with waste cooking vegetable oils (corn oil and soybean oil) to replace heavy oils and a commercial rejuvenator were used to recover the aged asphalt (extracted from RAP materials) with different ratios (by weight of asphalt) of 2, 4, 6, 8, and 10%. Dynamic shear rheometer (DSR) and rotational viscosity (RV) tests were used to evaluate the physical properties of the recovered asphalt binder. The low-temperature performance of the recovered asphalt binder was also evaluated by the bending beam rheometer (BBR) test. The laboratory tests and statistical analysis of variance (ANOVA) results show that the vegetable oil rejuvenators can effectively decrease the viscosity and stiffness of aged asphalt binder, which is beneficial for both fatigue and low-temperature cracking resistance. Furthermore, the rejuvenator can lower the viscosity and stiffness of the aged asphalt binder with a larger amount of vegetable oil. Overall, the vegetable oil content (6% to 8%) in the rejuvenator is proposed for recovering the aged asphalt binder in consideration of the rutting resistance under high temperatures.

ACS Style

Jie Ji; Hui Yao; Zhi Suo; Zhanping You; Haoxin Li; Shifa Xu; Lijun Sun. Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders. Journal of Materials in Civil Engineering 2017, 29, 1 .

AMA Style

Jie Ji, Hui Yao, Zhi Suo, Zhanping You, Haoxin Li, Shifa Xu, Lijun Sun. Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders. Journal of Materials in Civil Engineering. 2017; 29 (3):1.

Chicago/Turabian Style

Jie Ji; Hui Yao; Zhi Suo; Zhanping You; Haoxin Li; Shifa Xu; Lijun Sun. 2017. "Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders." Journal of Materials in Civil Engineering 29, no. 3: 1.

Research article
Published: 21 February 2017 in Advances in Materials Science and Engineering
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The objectives of this paper are to use Direct Coal Liquefaction Residue (DLCR) to modify the asphalt binders and mixtures and to evaluate the performance of modified asphalt mixtures. The dynamic modulus and phase angle of DCLR and DCLR-composite modified asphalt mixture were analyzed, and the viscoelastic properties of these modified asphalt mixtures were compared to the base asphalt binder SK-90 and Styrene-Butadiene-Styrene (SBS) modified asphalt mixtures. The master curves of the asphalt mixtures were shown, and dynamic and viscoelastic behaviors of asphalt mixtures were described using the Christensen-Anderson-Marasteanu (CAM) model. The test results show that the dynamic moduli of DCLR and DCLR-composite asphalt mixtures are higher than those of the SK-90 and SBS modified asphalt mixtures. Based on the viscoelastic parameters of CAM models of the asphalt mixtures, the high- and low-temperature performance of DLCR and DCLR-composite modified asphalt mixtures are obviously better than the SK-90 and SBS modified asphalt mixtures. In addition, the DCLR and DCLR-composite modified asphalt mixtures are more insensitive to the frequency compared to SK-90 and SBS modified asphalt mixtures.

ACS Style

Jie Ji; Hui Yao; Di Wang; Zhi Suo; Luhou Liu; Zhanping You. Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture. Advances in Materials Science and Engineering 2017, 2017, 1 -11.

AMA Style

Jie Ji, Hui Yao, Di Wang, Zhi Suo, Luhou Liu, Zhanping You. Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture. Advances in Materials Science and Engineering. 2017; 2017 ():1-11.

Chicago/Turabian Style

Jie Ji; Hui Yao; Di Wang; Zhi Suo; Luhou Liu; Zhanping You. 2017. "Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture." Advances in Materials Science and Engineering 2017, no. : 1-11.