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Yuan C.,Shanghai JiaoTong University | Wang S.,Shanghai JiaoTong University | Zhu Y.,Jiangsu Baoli Asphalt Co. | Wang H.,Jiangsu Baoli Asphalt Co. | Zhang Y.,Shanghai JiaoTong University
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2012

Effect of the recycle of the typical polyolefin plastics such as high density polyethylene (PE-HD), polypropylene (PP) on their properties of modified asphalt was investigated. The distribution and thermal properties of the polyolefin in the asphalts matrix were characterized using optical microscope and differential scanning calorimetry. The results indicate that asphalts modified by recycled polyethylene (RPE-HD) has higher temperature resistance and shorter ductility at 15°C, shorter needle penetration at 25°C than asphalts modified by PE-HD, while the asphalts modified by recycled (RPP) shows poor temperature resistance compared with that modified by PP. The distribution of the polyolefin in asphalts does not change remarkably after recycling. The melting point and the heating fusion of polyolefin in the asphalt are higher than those of the pure polyolefin.


Zumin O.,Nanjing Southeast University | Fujian L.,JiangSu BaoLi Asphalt CO.
Energy Procedia | Year: 2014

An effective and accurate prediction of the high-speed railway ballastless track structure (BTS) temperature field can be quite useful in the analysis of stress produced by temperature gradient within the track structure. In this paper, an analytical solution to the conductive heat transfer process in CRTS-II (abbreviation for China railway track system II) is developed from one-dimensional semi-infinite system, subjected to a periodic variation of track slab surface temperature. The measurement of the slab surface temperature from three pieces of track slab on 'Jing-Hu' (Beijing- Shanghai) high-speed railway was used to determine the initial condition for CRTS-II heat conduction equation. With the analytical solution and initial condition, the temperature distribution of the CRTS-II track at different time was calculated. Finally, the comparison of the calculated temperature and the measured temperature at depth z=20cm (track slab bottom)showed that the analytical solution to the temperature field is reasonable for temperature profile in the CRTS-II structure. © 2014 The Authors. Published by Elsevier Ltd.


Zhai X.-L.,Xi'an Jiaotong University | Zheng X.,Xi'an Jiaotong University | Xi H.-H.,Xi'an Jiaotong University | Li W.-B.,Xi'an Jiaotong University | And 2 more authors.
Journal of the American Ceramic Society | Year: 2015

In this work, a novel low-temperature firing microwave dielectric ceramic LiKSm2(MoO4)4 was prepared via solid-state reaction method. Ceramic samples with relative densities about 94.6% were obtained at sintering temperature 640°C-680°C. The best microwave dielectric properties was obtained in ceramic sample sintered at 620°C with a permittivity about 11.5, a Q × f value about 39 000 GHz and a temperature coefficient of frequency about -15.9 ppm/°C. According to XRD patterns and backscattered electron micrograph, combined with Energy Dispersive Spectra analysis, of cofired samples with 30 wt% aluminum sintered at 620°C/4 h, the LiKSm2(MoO4)4 ceramic was found to be chemically compatible with Al but react seriously with Ag, forming AgSmMo2O8 phase, at its sintering temperature. © 2015 The American Ceramic Society.


Zhang H.,Hunan University | Shi C.,Hunan University | Han J.,Jiangsu Baoli Asphalt Co. | Yu J.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

The effect of organic layered silicates (OLSs) on the flame retardancy and aging properties of the bitumen was investigated as well as the microstructures of the binders. X-ray diffraction shows that organic rectorite (OREC) and organic montmorillonite (OMMT) modified bitumens form the intercalated nanostructures, while the organic expanded vermiculite (OEVMT) modified bitumen forms the exfoliated nanostructure. The mass change rate and viscosity aging index of the bitumen are decreased by OLSs after thin film oven test and pressure aging vessel aging. Compared with OREC and OMMT, OEVMT has more pronounced improvements in flame retardancy and aging resistance of bitumen. © 2012 Elsevier Ltd. All rights reserved.


Wu K.,Zhejiang University | Zhu K.,Zhejiang University | Wu H.,Technical University of Denmark | Han J.,Zhejiang University | And 4 more authors.
Chinese Physics B | Year: 2014

Asphalt materials will be ignited and release significant toxic fumes within tunnel fires. Thus, combustion characteristics of asphalt materials used in road tunnel should be studied in order to limit such an adverse effect. In the present work we study the influence of limestone fillers on combustion characteristics of asphalt mortar by thermogravimetric and kinetic analysis. It is shown that the combustion of asphalt mortar is not just a linear superposition of asphalt and limestone. The limestone will increase the ignition point and the activation energy of the primary volatile release, and will catalyze the char formation from the primary volatile release. Kinetic analysis shows that the primary volatile release stage of asphalt mortar combustion can be explained by a three-dimensional diffusion model, the secondary volatile release and char combustion stage can be explained by a model under the assumption of random nucleation and nuclei growth, whereas the limestone decomposition stage appears to follow the one-dimensional phase boundary model. © 2014 Chinese Physical Society and IOP Publishing Ltd.


Han J.,Zhejiang University | Wu S.,Wuhan University of Technology | Huang Z.,Zhejiang University | Zhou D.,Jiangsu Baoli Asphalt Co. | Li F.,Jiangsu Baoli Asphalt Co.
Sustainable Construction Materials 2012 - Proceedings of the 2nd International Conference on Sustainable Construction Materials - Design, Performance, and Application | Year: 2013

Bitumen is widely used in road construction, but it is an organic mixture with complex compounds and chemical structures which will change after exposed to heat, oxygen, and ultraviolet radiation (UV) and make the physical properties worse, especially at low temperature. In this paper, different aging levels (TFOT, UV-6days) of asphalt binders with various mass ratio of layer clay powder to asphalt (0,3%,5%) were considered to investigate the low temperature rheological properties of aged asphalt binders and low temperature strength as well as fatigue properties. Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM) were used to evaluate low temperature properties of bitumen and mixture. The ageing evaluation shows that the ageing resistance of bitumen and its mixture is improved and this improvement at low temperature properties can be better maintained compared to base asphalt. © 2013 American Society of Civil Engineering.


Zhang Y.-D.,Xi'an Jiaotong University | Han J.,Jiangsu Baoli Asphalt Co. | Liang R.,China University of Mining and Technology | Zhou D.,Xi'an Jiaotong University
Materials Letters | Year: 2015

In this work, dielectric properties of the (1-x)Li2(Mg0.95Zn0.05)3Ti4O12-xLi2TiO3 (x=0.727, 0.778, 0.821, and 0.889) ceramics system prepared by a conventional solid state reaction method have been investigated. As x value varied from 0.727 to 0.889, temperature coefficient of the ceramics varied from -6.98 ppm/°C to +17.89 ppm/oC. At x=0.778, the 0.222Li2(Mg0.95Zn0.05)3Ti4O12-0.778Li2TiO3 ceramic sintered at 1260 °C was found to possess excellent properties with a relative dielectric constant ∼20.2, a quality factor (Q×f) ∼35,000 GHz at a resonant frequency of 7.93 GHz, and a temperature coefficient ∼ -3.29 ppm/°C. X-ray diffraction and scanning electron microscopy were employed to study the phase composition and microstructure of the ceramics. © 2015 Elsevier B.V. All rights reserved.


Li F.,Jiangsu Baoli Asphalt Co. | Han J.,Chinese Research Institute of Highway | Zhou D.,Zhejiang University | Hong T.,Jiangsu Baoli Asphalt Co.
Sustainable Construction Materials 2012 - Proceedings of the 2nd International Conference on Sustainable Construction Materials - Design, Performance, and Application | Year: 2013

In this study, the objective was to dedicate to the application of coal tar pitch in road engineering construction. The present application situation of the coal pitch was discussed. The asphalt and the asphalt mix were designed. Appropriate adjustment of the proportion of coal pitch and petroleum asphalt improved the technical indexes of asphalt. The optimal bitumen-aggregate ratio based on the closest skeleton-interlocking dense condition principle is selected. Results indicated that the mix with modified coal tar pitch and the designed optimal bitumen-aggregate ratio had good performances, involving high temperature stability, low temperature cracking resistance and water stability. Besides, it was also found that the construction temperature can be reduced by the warm mix asphalt additive decreasing the volatile of polycyclic aromatic hydrocarbon which was a carcinogenic substance in coal pitch. The conclusion of this paper is valuable for the further application of coal tar pitch. © 2013 American Society of Civil Engineering.


Wu K.,Zhejiang University | Zhu K.,Zhejiang University | Han J.,Zhejiang University | Han J.,Jiangsu Bao Li Asphalt Co. | And 3 more authors.
Chinese Physics B | Year: 2013

The combustion characteristics of styrene - butadiene - styrene (SBS) asphalt are studied by thermogravimetric analysis (TG/DTG) at four different heating rates. According to the saturates/aromatics/resins/asphaltenes (SARA) fractionation method, the combustion process of SBS asphalt can be divided by Gaussian peak fitting into three main stages: oil content release, resin pyrolysis, and asphaltene and char combustion. When the heating rate increases, the mass losses of the oil content and resin pyrolysis increase, and less asphaltenes are formed at a higher temperature. The activation energy values are calculated by the Coats - Redfern method to be in the range 61.6 kJ/mol-142.9 kJ/mol. The Popescu method is used for the kinetic analysis, and the result shows that the three stages of asphalt combustion can be explained by the sphere phase boundary reaction model, the second order chemical reaction model, nucleation, and its subsequent growth model, respectively. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Zhai X.-L.,Xi'an Jiaotong University | Zheng X.,Xi'an Jiaotong University | Xi H.-H.,Xi'an Jiaotong University | Li W.-B.,Xi'an Jiaotong University | And 2 more authors.
Journal of the American Ceramic Society | Year: 2015

In this work, a novel low-temperature firing microwave dielectric ceramic LiKSm2(MoO4)4 was prepared via solid-state reaction method. Ceramic samples with relative densities about 94.6% were obtained at sintering temperature 640°C-680°C. The best microwave dielectric properties was obtained in ceramic sample sintered at 620°C with a permittivity about 11.5, a Q × f value about 39 000 GHz and a temperature coefficient of frequency about -15.9 ppm/°C. According to XRD patterns and backscattered electron micrograph, combined with Energy Dispersive Spectra analysis, of cofired samples with 30 wt% aluminum sintered at 620°C/4 h, the LiKSm2(MoO4)4 ceramic was found to be chemically compatible with Al but react seriously with Ag, forming AgSmMo2O8 phase, at its sintering temperature. © 2015 The American Ceramic Society.

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