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Hainian Wang
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an, Shaanxi 710064, China

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Research article
Published: 09 December 2020 in Advances in Materials Science and Engineering
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Permeability is one of the most important engineering properties of clayey soil. However, the traditional method for determining the permeability coefficient is time-consuming. To establish a simple and accurate predictive method to obtain the permeability coefficient of artificial clayey soil based on the double cut-off transverse relaxation times (T2 cut-offs) using low-field nuclear magnetic resonance (NMR) technology, eight kinds of artificial clayey soil with different mineralogical compositions were prepared in the laboratory. Evaporation tests at 40°C were carried out on the saturated artificial clayey soil samples in an oven. During the evaporation process, NMR tests were also performed on the artificial clayey soil every hour. The results showed that the evaporation process could be divided into three stages according to different evaporation rates: the constant rate stage (CRS), the falling rate stage (FRS), and the residual stage (RS). The water evaporated in the CRS and FRS was defined as the absolute movable water and the partially movable water, respectively. The water that could not evaporate in the RS was defined as the immovable water. Based on the cumulative signal amplitudes in the T2 spectrum corresponding to different kinds of water, the double T2 cut-offs were defined. On the basis of the double T2 cut-offs and T2 spectrum of the saturated sample, an improved Timur–Coates (TC) model was established. The prediction capability of the improved model was evaluated by finding the determination coefficient (R2), mean absolute error (MAE), and root-mean-square error (RMSE). Compared with the typical TC model, the prediction accuracy of the improved model was much higher. In addition, the relationships between the double T2 cut-offs and fractal dimension (D) of the T2 spectrum of saturated artificial clayey soil were also identified.

ACS Style

Zhen Lu; Aimin Sha; Junfeng Gao; Meng Jia; Wentong Wang. An Improved Predictive Model for Determining the Permeability Coefficient of Artificial Clayey Soil Based on Double T2 Cut-Offs. Advances in Materials Science and Engineering 2020, 2020, 1 -14.

AMA Style

Zhen Lu, Aimin Sha, Junfeng Gao, Meng Jia, Wentong Wang. An Improved Predictive Model for Determining the Permeability Coefficient of Artificial Clayey Soil Based on Double T2 Cut-Offs. Advances in Materials Science and Engineering. 2020; 2020 ():1-14.

Chicago/Turabian Style

Zhen Lu; Aimin Sha; Junfeng Gao; Meng Jia; Wentong Wang. 2020. "An Improved Predictive Model for Determining the Permeability Coefficient of Artificial Clayey Soil Based on Double T2 Cut-Offs." Advances in Materials Science and Engineering 2020, no. : 1-14.

Review
Published: 28 June 2020 in Construction and Building Materials
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This article presented the latest development of testing methods concerning surface textures and skid resistance of asphalt pavements. A review of the repeatability and harmonization of field-testing methods for macrotexture is outlined. Measuring methods of skid resistance both in lab and in situ are reviewed. The harmonization research on the laboratory and field-testing methods are summarized. The recent progress of skid-resistance modeling of asphalt pavement from well-known research work is summarized. This article also suggests a few key research directions. First, compared with macrotexture, standard testing procedures for microtexture also need to be established for uniform and comparable characterization methods. Second, the gap between lab test and field test for skid resistance should be bridged to realize more accurate estimation of pavement frictional properties in the phase of lab design. There is the need for the International Friction Index (IFI) model to be reevaluated when the data is acquired from testers installed with ribbed tires. Third, the accurate tire modeling of the dynamically frictional contact between tire and pavement still needs to be improved. The parameters of pavement textures, traffic volume, water, hydroplaning, temperature, and friction law on tire-pavement friction should be considered in depth in the modeling aspect.

ACS Style

Miao Yu; Zhanping You; Guoxiong Wu; Lingyun Kong; Chaochao Liu; Junfeng Gao. Measurement and modeling of skid resistance of asphalt pavement: A review. Construction and Building Materials 2020, 260, 119878 .

AMA Style

Miao Yu, Zhanping You, Guoxiong Wu, Lingyun Kong, Chaochao Liu, Junfeng Gao. Measurement and modeling of skid resistance of asphalt pavement: A review. Construction and Building Materials. 2020; 260 ():119878.

Chicago/Turabian Style

Miao Yu; Zhanping You; Guoxiong Wu; Lingyun Kong; Chaochao Liu; Junfeng Gao. 2020. "Measurement and modeling of skid resistance of asphalt pavement: A review." Construction and Building Materials 260, no. : 119878.

Journal article
Published: 28 April 2020 in Applied Sciences
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In this paper, two types of Styrene-Butadiene-Rubber (SBR) were adopted to modify the Buton-rock asphalt (BRA) modified asphalt, aiming to select a binder with excellent comprehensive performances. Powder SBR and latex SBR (0%, 2%, 4%, 6%, and 8%), were mixed with the 15 w% BRA modified asphalt. The characterization of rheological properties included dynamic shear rheometer, rotational viscometer, and bending beam rheometer test. The short-term aging performance was characterized by the ratio of the complex shear modulus from the un-aged and rolling thin film oven (RTFOT) -aged asphalt. Besides, Fourier transform infrared spectroscopy and scanning electron microscopy were conducted to reveal the modification mechanism. It was observed that the two kinds of BRA-SBR modified asphalt had preferable anti-crack capacity at low temperatures than the BRA modified asphalt. Compared with latex SBR, the powder SBR significantly improved the high-temperature performance, and the anti-aging capacity was stable. However, some negative influence occurred by the addition of latex SBR on the anti-rutting and short-term aging property. According to the micro-mechanism analysis, adding powder SBR and latex SBR into BRA modified asphalt was a physical blending process, and they improved the dispersion state of BRA in asphalt. Based on the comprehensive performance, the recommended combination was BRA and powder SBR.

ACS Style

Fangting Qu; Songtao Lv; Junfeng Gao; Chaochao Liu. Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber. Applied Sciences 2020, 10, 3077 .

AMA Style

Fangting Qu, Songtao Lv, Junfeng Gao, Chaochao Liu. Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber. Applied Sciences. 2020; 10 (9):3077.

Chicago/Turabian Style

Fangting Qu; Songtao Lv; Junfeng Gao; Chaochao Liu. 2020. "Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber." Applied Sciences 10, no. 9: 3077.

Journal article
Published: 06 March 2020 in Construction and Building Materials
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In this study, the acoustic emission test has been performed on a three-point bending beam so as to simulate the initiation, propagation and penetration process of tensile cracks on an asphalt pavement under −10 °C. The characteristic parameters, such as the acoustic emission ringing count, signal energy, amplitude, average frequency under continuous load, have been obtained. In addition, the spatial evolution process of the internal micro-cracks have been tracked with the acoustic emission location. The results of the test show that the acoustic emission signal originates from the damage deformation in the area where the asphalt concrete specimen is weak. Its activity reflects the development level of the micro-cracks. The change curve of the acoustic emission (AE) parameters with the change in loading can be divided into three stages: calm period, slow-rapid growth period and step growth period. In the signal stepped growth period, the macro-crack “cracking point” of the specimen occurred. During this period, the sound emission ringing count and energy increased suddenly before falling back, and the signal amplitude and the dominant frequency range increased. These changes can be regarded as the forewarning generated by the acoustic emission before the occurrence of the macroscopic fracture damage of the specimen, and have certain predictability of the appearance of macro-cracks. The three-dimensional positioning of the acoustic emission technique can be utilized effectively to track the position of the main crack surface of the specimen, and reflect the dynamic evolution process of low temperature cracking of asphalt concrete. The acoustic emission has the potential for the detection of cracks in asphalt pavement in cold regions.

ACS Style

Hui Wei; Bing Hu; Feiyue Wang; Jianlong Zheng; Jiao Jin; Chaochao Liu. Temporal-spatial evolution characteristics of acoustic emission in asphalt concrete cracking process under low temperature. Construction and Building Materials 2020, 248, 118632 .

AMA Style

Hui Wei, Bing Hu, Feiyue Wang, Jianlong Zheng, Jiao Jin, Chaochao Liu. Temporal-spatial evolution characteristics of acoustic emission in asphalt concrete cracking process under low temperature. Construction and Building Materials. 2020; 248 ():118632.

Chicago/Turabian Style

Hui Wei; Bing Hu; Feiyue Wang; Jianlong Zheng; Jiao Jin; Chaochao Liu. 2020. "Temporal-spatial evolution characteristics of acoustic emission in asphalt concrete cracking process under low temperature." Construction and Building Materials 248, no. : 118632.

Journal article
Published: 01 November 2019 in Construction and Building Materials
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ACS Style

Junfeng Gao; Hainian Wang; Jiakang Chen; Xianwei Meng; Zhanping You. Laboratory evaluation on comprehensive performance of polyurethane rubber particle mixture. Construction and Building Materials 2019, 224, 29 -39.

AMA Style

Junfeng Gao, Hainian Wang, Jiakang Chen, Xianwei Meng, Zhanping You. Laboratory evaluation on comprehensive performance of polyurethane rubber particle mixture. Construction and Building Materials. 2019; 224 ():29-39.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Jiakang Chen; Xianwei Meng; Zhanping You. 2019. "Laboratory evaluation on comprehensive performance of polyurethane rubber particle mixture." Construction and Building Materials 224, no. : 29-39.

Journal article
Published: 04 October 2019 in Construction and Building Materials
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The objective of this paper is to propose a normalized characterization method based on the yield criterion to eliminate the impacts of different stress models on the fatigue behaviors characterization of cement-treated aggregates. Based on the theory of octahedral shear stress strength and yield surface mode, the yield surface of cement-treated aggregates was established with four-point bending, compression, and indirect tensile strength value under different loading rates. Then, the fatigue stress and corresponding ultimate strength could be characterized by the yield surface, uniformly and uniquely. In the yield surface space (I1, J2), the fatigue stress growth route from initial stress to ultimate strength was identified as fatigue stress path. Based on the fatigue stress path, the fatigue stress ratios related to loading rate and stress model were calculated. With these stress ratios, the conventional S-N fatigue equation was modified, on the basis of which a normalized characterization method of fatigue behavior was proposed to characterize the fatigue behavior of cement-treated aggregates. Compared with the traditional characterized method, the normalized characterization method has considered the influence of loading rate and stress model on strength and fatigue test results. The test results demonstrated that different strength and fatigue test results were obtained under distinct stress model and loading rates. All strength values have been expressed indiscriminately in the yield surface. With the normalized characterization method, a unique fatigue curve was gained for cement-treated aggregates under different loading rates and stress models. Therefore, findings of this work realized the normalization characterization of fatigue behavior of cement-treated aggregates.

ACS Style

Chaochao Liu; Songtao Lv; Xinghai Peng; Jianlong Zheng. Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion. Construction and Building Materials 2019, 228, 117099 .

AMA Style

Chaochao Liu, Songtao Lv, Xinghai Peng, Jianlong Zheng. Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion. Construction and Building Materials. 2019; 228 ():117099.

Chicago/Turabian Style

Chaochao Liu; Songtao Lv; Xinghai Peng; Jianlong Zheng. 2019. "Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion." Construction and Building Materials 228, no. : 117099.

Journal article
Published: 27 September 2019 in Construction and Building Materials
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The objective of this study was to introduce lignin as a bio-additive to modify the base asphalt and investigate the high-temperature rheological performances of lignin modified asphalts and virgin asphalt. In this study, asphalt PG 58-28 was selected as the virgin asphalt, and four contents, 2%, 4%, 6% and 8%, of the total binder by weight of lignin were incorporated in the base binder. Rotational viscosity (RV), dynamic shear rheometer (DSR), and multiple stress creep recovery (MSCR) tests were conducted to characterize the rheological performances of different types of asphalts. Linear amplitude sweep (LAS) test was employed to evaluate the fatigue performance. The results showed that the incorporation of lignin increased the viscosity of virgin asphalt at different rotational speeds. The activation energy showed an increasing trend as the lignin increased compared with the virgin asphalt. Meanwhile, the lignin incorporated into the asphalt binder increased the elastic components, and improved the resistance of asphalt binder to the permanent deformation regardless of the lignin contents. The addition of lignin in the asphalt binder could retard oxidation reactions that occurred in the asphalt during the rolling thin film oven aging. In addition, the incorporation of lignin may degrade the fatigue life of asphalt. However, when the content of lignin was less than 8%, the reduction was small. This study could provide a prospective foundation for the utilization of lignin extracted from waste biomass as an exceptional and renewable bio-additive in the field of asphalt pavement engineering.

ACS Style

Junfeng Gao; Hainian Wang; Chaochao Liu; Dongdong Ge; Zhanping You; Miao Yu. High-temperature rheological behavior and fatigue performance of lignin modified asphalt binder. Construction and Building Materials 2019, 230, 117063 .

AMA Style

Junfeng Gao, Hainian Wang, Chaochao Liu, Dongdong Ge, Zhanping You, Miao Yu. High-temperature rheological behavior and fatigue performance of lignin modified asphalt binder. Construction and Building Materials. 2019; 230 ():117063.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Chaochao Liu; Dongdong Ge; Zhanping You; Miao Yu. 2019. "High-temperature rheological behavior and fatigue performance of lignin modified asphalt binder." Construction and Building Materials 230, no. : 117063.

Journal article
Published: 01 April 2019 in Construction and Building Materials
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ACS Style

Lingyun You; Zhanping You; Qingli Dai; Xinfeng Xie; Sarah Washko; Junfeng Gao. Investigation of adhesion and interface bond strength for pavements underlying chip-seal: Effect of asphalt-aggregate combinations and freeze-thaw cycles on chip-seal. Construction and Building Materials 2019, 203, 322 -330.

AMA Style

Lingyun You, Zhanping You, Qingli Dai, Xinfeng Xie, Sarah Washko, Junfeng Gao. Investigation of adhesion and interface bond strength for pavements underlying chip-seal: Effect of asphalt-aggregate combinations and freeze-thaw cycles on chip-seal. Construction and Building Materials. 2019; 203 ():322-330.

Chicago/Turabian Style

Lingyun You; Zhanping You; Qingli Dai; Xinfeng Xie; Sarah Washko; Junfeng Gao. 2019. "Investigation of adhesion and interface bond strength for pavements underlying chip-seal: Effect of asphalt-aggregate combinations and freeze-thaw cycles on chip-seal." Construction and Building Materials 203, no. : 322-330.

Journal article
Published: 12 March 2019 in Construction and Building Materials
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Fog seal with sand (FSS) became a promising technique for the preventive maintenance of flexible pavements. However, there is no quick and effective test method to evaluate whether it is possible to open the road to traffic shortly after the rehabilitation work. This study aims to introduce a new evaluation method to confirm the exact traffic opening time. In this paper, experimental works were performed based on the empirical tests, in terms of penetration, ductility, softening point, viscosity, permeability, and sand optimization tests to determine the best material. Evaporation and load abrasion tests were conducted to attain essential information that will help in establishing the new evaluation method and standard. Meanwhile, Damping test was conducted to prepare the stained pad specimens for the image analysis using Image Processing Technology (IPT). Results show that Material C (from SealMaster) had the best performance of rejuvenation and permeability. In addition, when the application rate ranged from 1.4 kg/m2 to 1.68 kg/m2 and the temperature interval ranged from 20 °C to 40 °C, it took four hours or more to complete the curing process. Finally, 2% of the stained pixel was confirmed as a terminal condition. A standard protocol based on the damping test and IPT has been established to decide the exact curing time required prior to opening the road for traffic.

ACS Style

Xiang Zhang; Hainian Wang; Mohd Rosli Mohd Hasan; Junfeng Gao; Muhammad Irfan. Traffic open time prediction of fog seal with sand using image processing technology. Construction and Building Materials 2019, 209, 9 -19.

AMA Style

Xiang Zhang, Hainian Wang, Mohd Rosli Mohd Hasan, Junfeng Gao, Muhammad Irfan. Traffic open time prediction of fog seal with sand using image processing technology. Construction and Building Materials. 2019; 209 ():9-19.

Chicago/Turabian Style

Xiang Zhang; Hainian Wang; Mohd Rosli Mohd Hasan; Junfeng Gao; Muhammad Irfan. 2019. "Traffic open time prediction of fog seal with sand using image processing technology." Construction and Building Materials 209, no. : 9-19.

Journal article
Published: 30 January 2019 in Applied Sciences
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To uniform the evaluation indicators of Styrene-Butadiene-Styrene (SBS) modified asphalt, the SK70# and SK90# matrix asphalt were modified by different SBS modifier dosage in this study. The test methods in China and Superpave were used to test the performance of each SBS-modified asphalt respectively, from which the appropriate evaluation index of SBS-modified asphalt was determined. The results showed that the addition of SBS modifier improved the high temperature performance and lowered the temperature sensitivity of asphalt binder, while it increased the viscosity of asphalt binder in high temperatures. Due to the variability that appeared in the results of the penetration test by the swelling of SBS-modified asphalt, the penetration test was not recommended to evaluate the performances of SBS-modified asphalt. The softening point of SBS-modified asphalt with the modifier dosages of 4.5%, 5%, 5.5% and 6% increased 5.7%, 12.8%, 22.5% and 26.4% respectively compared to the matrix asphalt for SK70# matrix asphalt, and increased 21.2%, 26.3%, 33.6% and 46.6% respectively compared to the matrix asphalt for SK90# matrix asphalt. The effect of SBS-modifier on the softening point of SK90# matrix asphalt is significantly better than that of SK70# matrix asphalt. The improvement effect of SBS modifier on low temperature performance of matrix asphalt decreased with a decrease in test temperature. When studying the influence of the SBS modifier on the low temperature performance of asphalt binder, it was recommended to use the bending beam rheometer (BBR) test to evaluate the low temperature performance of SBS-modified asphalt.

ACS Style

Chen Zhang; Hainian Wang; Zhanping You; Junfeng Gao; Muhammad Irfan. Performance Test on Styrene-Butadiene-Styrene (SBS) Modified Asphalt Based on the Different Evaluation Methods. Applied Sciences 2019, 9, 467 .

AMA Style

Chen Zhang, Hainian Wang, Zhanping You, Junfeng Gao, Muhammad Irfan. Performance Test on Styrene-Butadiene-Styrene (SBS) Modified Asphalt Based on the Different Evaluation Methods. Applied Sciences. 2019; 9 (3):467.

Chicago/Turabian Style

Chen Zhang; Hainian Wang; Zhanping You; Junfeng Gao; Muhammad Irfan. 2019. "Performance Test on Styrene-Butadiene-Styrene (SBS) Modified Asphalt Based on the Different Evaluation Methods." Applied Sciences 9, no. 3: 467.

Journal article
Published: 19 December 2018 in Applied Sciences
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In order to systematically study the rutting resistance performance of High-Modulus Asphalt Concrete (HMAC) pavements, a finite element method model of HMAC pavement was established using ABAQUS software. Based on the viscoelasticity theory of asphalt, the stress and deformation distribution characteristics of HMAC pavement were studied and compared to conventional asphalt pavement under moving loads. Then, the pavement temperature field model was established to study the temperature variation and the thermal stress in HMAC pavement. Finally, under the condition of continuous temperature variation, the creep behavior and permanent deformation of HMAC pavement were investigated. The results showed that under the action of moving loads, the strain and displacement generated in HMAC pavement were lower than those in conventional asphalt pavement. The upper surface layer was most obviously affected by outside air temperature, resulting in maximum thermal stress. Lastly, under the condition of continuous temperature change, HMAC pavement could greatly reduce the deformation of asphalt material in each surface layer compared to conventional asphalt pavement.

ACS Style

Chundi Si; Hang Cao; Enli Chen; Zhanping You; Ruilan Tian; Ran Zhang; Junfeng Gao. Dynamic Response Analysis of Rutting Resistance Performance of High Modulus Asphalt Concrete Pavement. Applied Sciences 2018, 8, 2701 .

AMA Style

Chundi Si, Hang Cao, Enli Chen, Zhanping You, Ruilan Tian, Ran Zhang, Junfeng Gao. Dynamic Response Analysis of Rutting Resistance Performance of High Modulus Asphalt Concrete Pavement. Applied Sciences. 2018; 8 (12):2701.

Chicago/Turabian Style

Chundi Si; Hang Cao; Enli Chen; Zhanping You; Ruilan Tian; Ran Zhang; Junfeng Gao. 2018. "Dynamic Response Analysis of Rutting Resistance Performance of High Modulus Asphalt Concrete Pavement." Applied Sciences 8, no. 12: 2701.

Journal article
Published: 15 October 2018 in Construction and Building Materials
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The reuse of waste tire and biomass is important to environmental protection. The main objective of this study is to investigate the effect of bio-oil on the high-temperature performance of crumb rubber modified asphalt. Two types of crumb rubber powder produced from waste tire, 80-mesh and 20-mesh, were used to prepare the crumb rubber modified asphalt. Four weight ratios of bio-oil to rubber asphalt, 0%, 5%, 10%, and 15%, were chosen to prepare the composite modified asphalt binder in this study. Temperature sweep test and multiple stress creep recovery (MSCR) test were conducted to evaluate the high-temperature of the composite modified asphalt. The results showed that the viscosities of asphalts modified by 20-mesh crumb rubber were greater than that modified by 80-mesh ones. With the addition of bio-oil into crumb rubber asphalt, the viscosities of the composite modified asphalts first increased then decreased. Bio-oil can enhance the high-temperature performance of crumb rubber modified asphalt due to the physical and chemical interactions in a heated asphalt. The short-term aging process may improve the degree of blending between crumb rubber and bio-oil in the heated asphalt dispersion system and enhance the elastic property of crumb rubber modified asphalt.

ACS Style

Yong Lei; Hainian Wang; Ellie H. Fini; Zhanping You; Xu Yang; Junfeng Gao; Shi Dong; Guan Jiang. Evaluation of the effect of bio-oil on the high-temperature performance of rubber modified asphalt. Construction and Building Materials 2018, 191, 692 -701.

AMA Style

Yong Lei, Hainian Wang, Ellie H. Fini, Zhanping You, Xu Yang, Junfeng Gao, Shi Dong, Guan Jiang. Evaluation of the effect of bio-oil on the high-temperature performance of rubber modified asphalt. Construction and Building Materials. 2018; 191 ():692-701.

Chicago/Turabian Style

Yong Lei; Hainian Wang; Ellie H. Fini; Zhanping You; Xu Yang; Junfeng Gao; Shi Dong; Guan Jiang. 2018. "Evaluation of the effect of bio-oil on the high-temperature performance of rubber modified asphalt." Construction and Building Materials 191, no. : 692-701.

Journal article
Published: 07 July 2018 in Construction and Building Materials
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The microstructure characteristic of asphalt mixture has substantial effects on its macroscopic mechanical properties. The study on the structural characteristics of asphalt mixtures involving the microscopic scale has rarely been considered. This study investigates the effects of the angularity of coarse aggregate on the microstructure of two commonly practiced asphalt mixture gradations (AC-16 and SMA-16) based on the X-ray Computed Tomography (XCT). Three-dimensional angularity was introduced based on the XCT images. Four indicators including average contact point number (ACN), average contact length (ACL), average vertical contact index (AVCI) and average horizontal contact index (AHCI) were proposed to evaluate the skeleton contact characteristics within the asphalt mixture through iPas. The volume of air voids, equivalent diameter and roundness were used to characterize the void characteristic of the asphalt mixtures with different angular aggregates by the analysis of Image-Pro Plus (IPP). The results indicate that the three-dimensional angularity (3DA) could characterize the angularity of coarse aggregate. The angularity has a significant influence on the skeleton contact characteristics of asphalt mixture, whereas a lower angularity has resulted in weaker skeleton contact characteristics. A skeleton contact characteristic of SMA-16, with a dense coarse aggregate structure, is stronger than AC-16, which belongs to the dense suspension structure. The shape of the voids at the top and bottom of the asphalt mixture specimen is the most complex and irregular, while the shape of air voids in the middle section of the specimen is simple and regular. This study could provide support for the further research and application of microscopic properties of asphalt mixtures.

ACS Style

Junfeng Gao; Hainian Wang; Yin Bu; Zhanping You; Mohd Rosli Mohd Hasan; Muhammad Irfan. Effects of coarse aggregate angularity on the microstructure of asphalt mixture. Construction and Building Materials 2018, 183, 472 -484.

AMA Style

Junfeng Gao, Hainian Wang, Yin Bu, Zhanping You, Mohd Rosli Mohd Hasan, Muhammad Irfan. Effects of coarse aggregate angularity on the microstructure of asphalt mixture. Construction and Building Materials. 2018; 183 ():472-484.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Yin Bu; Zhanping You; Mohd Rosli Mohd Hasan; Muhammad Irfan. 2018. "Effects of coarse aggregate angularity on the microstructure of asphalt mixture." Construction and Building Materials 183, no. : 472-484.

Journal article
Published: 03 June 2018 in Applied Sciences
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The demand for bituminous materials is continuously growing; crude oil-based asphalt binders are non-renewable, and are facing rapid depletion. With the increase of petroleum-based asphalt prices, seeking an alternative, renewable material such as bio-asphalt has become a hot research topic. However, shortcomings in this research area have been identified, notably concerning the high-temperature performance of bio-asphalt at present. This research aims to comprehensively apply conventional tests to, and study the rheological behavior of, the high-temperature performances of bio-asphalt binders, i.e., by temperature and frequency sweeps, using a dynamic shear rheometer (DSR). It will also assess the chemical functional groups of specimens prepared by different aging conditions. Fifty penetration grade base asphalt binder (50#), bio-oil modified asphalt binders with 0%, 5%, 10%, and 30% bio-oil contents by mass, and bio-oil modified asphalt binder with combinations of 5% bio-oil-1% SBS, and 10% bio-oil-1% SBS were used in this study. The conventional performance of bio-asphalt binders was tested using penetration, ductility, and softening point, before and after short-term aging conditioning. The temperature sweep and frequency sweep of bio-asphalt under different bio-oil contents were carried out via DSR. Two-logarithmic equations of rutting factor and temperature were established, and the temperature sensitivity of bio-asphalt was analyzed. The master curves of virgin asphalt and bio-asphalt were constructed at 64 °C. The results indicate that the incorporation of bio-oil reduced the anti-rutting performance of asphalt, and the bio-oil content had a significant effect on the mass loss of the bio-asphalt binder. The performance of bio-oil modified asphalt binders using 5% bio-oil, 5% bio-oil-1% SBS, and 10% bio-oil-1% SBS, could meet the requirements of 50# grade asphalt. The temperature sensitivity of bio-asphalt did not show obvious change before and after short-term aging, whereas the temperature sensitivity of bio-asphalt with 5% bio-oil was relatively small. With an increase in temperature, the phase angle increased gradually. In contrast, the storage modulus, loss modulus, and complex modulus decreased progressively. The complex modulus and rutting factor of bio-asphalt with 5% bio-oil steadily increased with the increase in testing frequency. Otherwise, chemical reactions were detected in the 50# base asphalt modified with the bio-oil.

ACS Style

Junfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan; Yong Lei; Muhammad Irfan. Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders. Applied Sciences 2018, 8, 919 .

AMA Style

Junfeng Gao, Hainian Wang, Zhanping You, Mohd Rosli Mohd Hasan, Yong Lei, Muhammad Irfan. Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders. Applied Sciences. 2018; 8 (6):919.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan; Yong Lei; Muhammad Irfan. 2018. "Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders." Applied Sciences 8, no. 6: 919.

Journal article
Published: 17 April 2018 in Construction and Building Materials
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Bio-oil is a sustainable and environment-friendly material. The application of bio-oil in paving material, especially into asphalt binder territory, has attracted great attentions. This study focuses on the effect of bio-oil on mechanical and rheological characteristics of asphalt mastic. Bio-oil acting as a modifier was incorporated into asphalt binder by a weight percentage of 15%. Eight types of asphalt mastics were fabricated by means of mixing binder with various amounts of mineral powder filler. The effect of bio-oil on the shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics was investigated by the cone penetration test, multiple stress creep recovery test and bending beam test, respectively. The result showed that the critical thermostability temperature of petroleum-based asphalt binder was 1.5 times higher than that of bio-modified asphalt binder. The shear strength of asphalt mastic with and without bio-oil increased with an increase in filler-to-binder ratio. The incorporation of bio-oil enhanced the high temperature stability of asphalt mastic. Asphalt mastic with and without bio-oil exhibited a great anti-deformation potential at high temperature of 64 °C when the filler-to-binder ratio reaches to 1.2. Filler-to-binder ratio had little influence on the corresponding deflection of bio-modified asphalt mastic at −10 °C.

ACS Style

Yong Lei; Hainian Wang; Xi Chen; Xu Yang; Zhanping You; Shi Dong; Junfeng Gao. Shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics modified with bio-oil. Construction and Building Materials 2018, 174, 30 -37.

AMA Style

Yong Lei, Hainian Wang, Xi Chen, Xu Yang, Zhanping You, Shi Dong, Junfeng Gao. Shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics modified with bio-oil. Construction and Building Materials. 2018; 174 ():30-37.

Chicago/Turabian Style

Yong Lei; Hainian Wang; Xi Chen; Xu Yang; Zhanping You; Shi Dong; Junfeng Gao. 2018. "Shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics modified with bio-oil." Construction and Building Materials 174, no. : 30-37.

Journal article
Published: 01 February 2018 in International Journal of Pavement Research and Technology
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Most of the existing researches only focus on some performances of the bio-asphalt binders instead of the asphalt mixtures, and the relationship between the performance of bio-asphalt binder and the performance of the mixture has been rarely reported. To analyze the gray relational entropy of high temperature performance of bio-asphalt binder and mixture, the bio-asphalt modified by 1% SBS with the concentrations of 0% (50#), 5%, 10%, 15%, and 20% by the weight of bio-asphalt binder, respectively, was used in this study. The performance indexes of bio-asphalt binder were tested through the conventional performance test and Superpave test of asphalt. The correlation between the performance indexes of the asphalt binder and the dynamic stability of the mixture was studied through the gray relational entropy method. The results showed that the high temperature performance of bio-asphalt had a certain degree of reduction before RTFO with the incorporation of bio-oil. The binder test parameters showed different changes in the law with the changes of bio-oil content. The dynamic stability of bio-asphalt mixtures decreased with an increase in bio-oil content. The RTFO aging had a great influence on the entropy correlation between the performance indexes of the bio-asphalt binders and the dynamic stability of the mixture. The non-recoverable creep compliance of bio-asphalt with low content (1%) of SBS modifier was weakly correlated with the dynamic stability of the mixture. The dynamic viscosity of bio-asphalt and the dynamic stability of the mixture exhibited the highest gray entropy correlation, which could be used as the key index of high-temperature performance evaluation of bio-asphalt.

ACS Style

Junfeng Gao; Hainian Wang; Zhanping You; Xu Yang. Gray relational entropy analysis of high temperature performance of bio-asphalt binder and its mixture. International Journal of Pavement Research and Technology 2018, 1 .

AMA Style

Junfeng Gao, Hainian Wang, Zhanping You, Xu Yang. Gray relational entropy analysis of high temperature performance of bio-asphalt binder and its mixture. International Journal of Pavement Research and Technology. 2018; ():1.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Zhanping You; Xu Yang. 2018. "Gray relational entropy analysis of high temperature performance of bio-asphalt binder and its mixture." International Journal of Pavement Research and Technology , no. : 1.

Journal article
Published: 01 January 2018 in Construction and Building Materials
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Bio-asphalt is a binding agent that is made of bio-oil and petroleum asphalt, or bio-oil modified with incorporations of some other additives under certain conditions. This study was carried out to evaluate the properties of bio-asphalt binder-based in terms of the value of complex shear modulus (G∗) and the phase angle (δ) tested by dynamic shear rheometer (DSR). Four bio-oil dosages of 5, 10, 15, and 20% based on the weight of asphalt (S100) were used to alter the SBS-modified binder. Whereby, the SBS content is approximately 1% of the weight of the virgin asphalt. The complex shear modulus and frequencies of virgin and short-term aged binders were tested. The master curves of rutting factor (G∗/sinδ) of different bio-asphalt were then generated to survey its rheological properties in a broad range of frequencies and temperatures. Based on the results, it was found that the addition of bio-oil extracted from sawdust has significantly increased the complex shear modulus of asphalt binder at the same frequency conditions after going through rolling thin film oven (RTFO), which is desirable for rutting prevention of asphalt mixtures. The rheological properties of bio-binders are more susceptible to the RTFO aging condition compared to the reference binder. The master curve of rutting factor of bio-binder indicated that the rutting factor of bio-asphalt increased with the increase of frequency before and after RTFO. Additionally, incorporations of bio-oil into the SBS modified asphalt, has greatly increased the rutting factor (G∗/sinδ) after RTFO, regardless of the loading frequency. However, the degree of enhancement was dominated by the percentage of bio-oil and aging condition.

ACS Style

Junfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan. Research on properties of bio-asphalt binders based on time and frequency sweep test. Construction and Building Materials 2018, 160, 786 -793.

AMA Style

Junfeng Gao, Hainian Wang, Zhanping You, Mohd Rosli Mohd Hasan. Research on properties of bio-asphalt binders based on time and frequency sweep test. Construction and Building Materials. 2018; 160 ():786-793.

Chicago/Turabian Style

Junfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan. 2018. "Research on properties of bio-asphalt binders based on time and frequency sweep test." Construction and Building Materials 160, no. : 786-793.

Journal article
Published: 01 December 2017 in Journal of Materials in Civil Engineering
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Developing new sustainable materials such as bioasphalt has become a research trend in recent years. In this study, bioasphalt modified with the addition of styrene-butadiene-styrene (SBS) was investigated to research whether it can replace petroleum asphalt binder of 50 penetration grade (50#) in road performance at a lower price. A series of laboratory tests were carried out to evaluate the performance of SBS-modified bioasphalt binders and mixtures, including penetration, softening point, ductility, rutting, moisture susceptibility, and low-temperature cracking. The SBS-modified bioasphalt was prepared with different of bio-oil content: 0, 5, 10, 15, and 20%. Moreover, a comprehensive evaluation was applied to all types of asphalt and a recommended selection of asphalts was provided. The research showed that the performance of SBS-modified bioasphalt could satisfy the specification requirements of 50# base binder when bio-oil concentration was less than 15%. The high-temperature stability of SBS bioasphalt mixture was worse than that of the 50# base binder mixture to some degree, but could still satisfy the specification requirements. The SBS-modified bioasphalt mixture had better thermal crack resistance and water stability than the 50# base binder mixture, and it had better adhesion at low temperatures, reaching its maximum adhesion value with an aggregate loss of 4.33% when the bio-oil content was 10%. The SBS-modified bioasphalt with 10% bio-oil (S110) is thus recommended according to the performance evaluation and cost analysis. Furthermore, from the standpoint of environmental protection and economic benefits, S110 has good development prospects.

ACS Style

Ran Zhang; Hainian Wang; Junfeng Gao; Xu Yang; Zhanping You. Comprehensive Performance Evaluation and Cost Analysis of SBS-Modified Bioasphalt Binders and Mixtures. Journal of Materials in Civil Engineering 2017, 29, 04017232 .

AMA Style

Ran Zhang, Hainian Wang, Junfeng Gao, Xu Yang, Zhanping You. Comprehensive Performance Evaluation and Cost Analysis of SBS-Modified Bioasphalt Binders and Mixtures. Journal of Materials in Civil Engineering. 2017; 29 (12):04017232.

Chicago/Turabian Style

Ran Zhang; Hainian Wang; Junfeng Gao; Xu Yang; Zhanping You. 2017. "Comprehensive Performance Evaluation and Cost Analysis of SBS-Modified Bioasphalt Binders and Mixtures." Journal of Materials in Civil Engineering 29, no. 12: 04017232.

Journal article
Published: 28 March 2017 in Construction and Building Materials
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Crude oil-based asphalt supplies are shrinking while its demand is increasing rapidly; this, in turn, has led to an increase in the price of asphalt binder. As the price of asphalt increases, seeking for alternative and renewable binder resources, such as bio-asphalt, has become a hot research topic. However, the high temperature performances of bio-asphalt are unsatisfactory according to many previous studies. This study aims to enhance the high temperature performance of bio-asphalt by adding SBS into the matrix asphalt. Five types of SBS modified bio-asphalts were studied. Studies included their viscosity, anti-rutting performance and temperature sensitivity through the rotational viscometer (RV) and dynamic shear rheometer (DSR). Among them, SBS dosage was 1% of SBS modified bio-asphalt and the 50 penetration grade binder was applied as the base binder. The bio-oil contents for the five types of binders were 0%, 5%, 10%, 15% and 20% by weight of the SBS modified bio-asphalt. It was found that SBS modified bio-asphalt had higher viscosity than the base binder to some degree, and the effect of bio-oil on SBS bio-binder viscosity was small when the bio-oil content and testing temperature were high. The mixing and compaction temperatures of SBS modified bio-asphalt were about the same as those of the 50# base binder when the bio-oil content was more than 10%. Before RTFO testing, the SBS bio-binder had more viscous characteristics and a lower anti-rutting performance, but was not significantly different from that of the base binder. However, an opposite trend was observed after the RTFO test. Meanwhile, SBS bio-binder was less sensitive to temperature than the base binder and such sensitivity decreased with the increase in bio-oil content before RTFO. After RTFO, the temperature sensitivity of the SBS bio-binder was still lower than that of the 50# base binder when bio-oil content was less than 20%, and grew with the increase in bio-oil content.

ACS Style

Ran Zhang; Hainian Wang; Junfeng Gao; Zhanping You; Xu Yang. High temperature performance of SBS modified bio-asphalt. Construction and Building Materials 2017, 144, 99 -105.

AMA Style

Ran Zhang, Hainian Wang, Junfeng Gao, Zhanping You, Xu Yang. High temperature performance of SBS modified bio-asphalt. Construction and Building Materials. 2017; 144 ():99-105.

Chicago/Turabian Style

Ran Zhang; Hainian Wang; Junfeng Gao; Zhanping You; Xu Yang. 2017. "High temperature performance of SBS modified bio-asphalt." Construction and Building Materials 144, no. : 99-105.