检索结果-南通市图书馆

Journal of Traffic and Transportation Engineering(English Edition) 2019年第3期6卷 256-272页

作者： Saisai Zhang Rui Li jianzhong pei School of Highway Chang’an University

The morphological characteristics of coarse aggregates, namely shape profile, angularity and surface texture, have a significant effect on the mechanical properties of asphalt mixtures. The identification methods and evaluation indexes of the morphological characteristics are crucial for the coarse aggregates. First, the visual identification technologies, including charged coupled device (CCD) image processing, X-ray tomography imaging and laser scanning technology, are summarized in term of the characteristics, research status and existing problems. Based on the deficiencies of visual identification technologies, it is proposed to improve the three-dimensional reconstruction of aggregate particles by increasing the number of two-dimensional projection directions or scanning sections. Moreover, the evaluation indexes of coarse aggregate morphology were summarized from the three aspects, namely shape profile, angularity and surface texture. It is found that evaluation of the indexes based on two-dimensional profile images or unrelated to pavement performance could not adequately evaluate the morphological characteristics of coarse aggregates. Therefore, the evaluation methods and indexes of coarse aggregate morphological characteristics have been recommended based on the performance of asphalt mixtures in this paper, which is helpful to establish a complete set of an evaluation system for coarse aggregate morphology.

关键词： Road material Coarse aggregate Morphological characteristic Identification method Evaluation index

Structural dimension optimization and mechanical response analysis of fabricated honeycomb plastic pavement slab

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Frontiers of Structural and Civil Engineering 2022年第7期16卷 896-908页

作者： Zixuan CHEN Tao LIU Xiao MA Hanyu TANG Jianyou HUANG jianzhong pei School of Highway Chang’an UniversityXi’an 710064China School of Civil Engineering Tianjin UniversityTianjin 300350China

Because of favorable mechanical properties,deformation resistance and being conducive to environmental protection,honeycomb fabricated plastic pavement slabs are highly recommended these *** present,most studies focus on the performance of plastic materials,however,the dimension optimization of fabricated plastic pavement slab is rarely *** this paper,an optimized geometry of the honeycomb pavement slab was determined through finite element *** response of honeycomb slabs with different internal dimensions and external dimensions were *** dimension factors were taken into consideration including the side length,rib thickness,the thickness of both top and bottom slabs of honeycomb structure and the length,the width and the thickness of the fabricated plastic *** results showed that honeycomb pavement slab with 6 cm bottom slab,12 cm top slab,18 cm side length and 6 cm rib thickness is recommended,additionally,an external dimension of 4 m×4 m×0.45 m is ***,the mechanical responses of this optimized fabricated plastic slab were further *** of different influencing factors,including wheel load,elastic modulus of plastic material,base layer thickness,soil foundation modulus and base layer modulus were ranked.

关键词： honeycomb structure plastic pavement dimension optimization mechanical response factor significance

Evaluation of the compatibility between rubber and asphalt based on molecular dynamics simulation

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Frontiers of Structural and Civil Engineering 2020年第2期14卷 435-445页

作者： Fucheng GUO Jiupeng ZHANG jianzhong pei Weisi MA Zhuang HU Yongsheng GUAN Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China Jiangsu Sinoroad Engineering Research Institute Co. LtdNanjing 211806China

Using of rubber asphalt can both promote the recycling of waste tires and improve the performance of asphalt ***,the segregation of rubber asphalt caused by the poor storage stability always appears during its *** stability of asphalt and rubber is related to the compatibility and also influenced by rubber *** this study,molecular models of different rubbers and chemical fractions of asphalt were built to perform the molecular dynamics *** solubility parameter and binding energy between rubber and asphalt were obtained to evaluate the compatibility between rubber and asphalt as well as the influence of rubber content on *** show that all three kinds of rubber are commendably compatible with asphalt,where the compatibility between asphalt and cis-polybutadiene rubber(BR)is the best,followed by styrene-butadiene rubber(SBR),and natural rubber(NR)is the *** optimum rubber contents for BR asphalt,SBR asphalt,and NR asphalt were determined as 15%,15%,and 20%,*** addition,the upper limits of rubber contents were found as between 25%and 30%,between 20%and 25%,and between 25%and 30%,respectively.

关键词： rubber asphalt compatibility rubber content molecular dynamics simulation

Using thermodynamic parameters to study self-healing and interface properties of crumb rubber modified asphalt based on molecular dynamics simulation

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 109-122页

作者： Dongliang HU jianzhong pei Rui LI Jiupeng ZHANG Yanshun JIA Zepeng FAN School of Transportation Southeast UniversityNanjing 211189China School of Highway Chang’an UniversityXi’an 710064China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China

The thermodynamic property of asphalt binder is changed by the addition of crumb rubber,which in turn influences the self-healing property as well as the cohesion and adhesion within the asphalt-aggregate *** study investigated the self-healing and interface properties of crumb rubber modified asphalt(CRMA)using thermodynamic parameters based on the molecular simulation *** molecular models of CRMA were built with representative structures of the virgin asphalt and the crumb *** aggregate was represented by SiO2 and Al2O3 *** selfhealing capability was evaluated with the thermodynamic parameter wetting time,work of cohesion and *** interface properties were evaluated by characterizing the adhesion capability,the debonding potential and the moisture susceptibility of the asphalt-aggregate *** self-healing capability of CRMA is found to decrease as the rubber content *** asphalt-Al2O3 interface with higher rubber content has stronger adhesion and moisture *** the influence of crumb rubber on the interfacial properties of asphalt-SiO2 interface has no statistical *** with the interfacial properties of the asphalt-SiO2 interface,the asphalt-Al2O3 interface is found to have a stronger adhesion but a worse moisture susceptibility for its enormous thermodynamic potential for water to displace the asphalt binder.

关键词： crumb rubber modified asphalt surface free energy self-healing interface properties molecular dynamics simulation

Effects of Conductive Carbon Black on Thermal and Electrical Properties of Barium Titanate/Polyvinylidene Fluoride Composites for Road Application

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Journal of Renewable Materials 2023年第5期11卷 2469-2489页

作者： Zhenguo Wang Lenan Wang Yejing Meng Yong Wen jianzhong pei School of Highway Chang’an UniversityXi’an710064China

In the field of roads,due to the effect of vehicle loads,piezoelectric materials under the road surface can convert mechanical vibration into electrical energy,which can be further used in road facilities such as traffic signals and street *** barium titanate/polyvinylidene fluoride(BaTiO_(3)/PVDF)composite,the most common hybrid ceramic-polymer system,was widely used in various fields because the composite combines the good dielectric property of ceramic materials with the good flexibility of PVDF *** studies have found that conductive particles can further improve the dielectric and piezoelectric properties of other ***,few studies have investigated the effect of conductive carbon black on the dielectric and piezoelectric properties of BaTiO_(3)/PVDF *** this study,BaTiO_(3)/PVDF/conductive carbon black composites were prepared with various conductive carbon black contents based on the optimum ratio of BaTiO_(3)to *** effects of conductive carbon black content on the morphologies,thermal performance,conductivities,dielectric properties,and piezoelectric properties of the BaTiO_(3)/PVDF/conductive carbon black composites were then *** addition of conductive carbon black greatly enhances the conductivities,dielectric properties,and piezoelectric properties of the BaTiO_(3)/PVDF/conductive carbon black composites,especially when the carbon black content is 0.8%by weight of ***,the conductive carbon black does not have an obvious effect on the morphologies and thermal stabilities of BaTiO_(3)/PVDF/conductive carbon black composites.

关键词： Dielectric property piezoelectric property conductivity thermal stability BaTiO_(3)/PVDF composites conductive carbon black

Design and evaluation of glasphalt mixtures by using recycled waste cullet

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Journal of Southeast University(English Edition) 2019年第2期35卷 198-205页

作者： Zhou Bochao pei jianzhong Lü Lei Zhang Jiupeng Qiu Ji Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi’an 710064China

A glass crusher was developed to improve the waste glass crushing *** waste glass was recycled,crushed and sieved to different particle sizes as glass aggregates,and the surface of glass aggregates was treated by nano-Fe2O3 suspension to improve the anti-striping *** glasphalt mixture made by partly replacing mineral aggregates with glass aggregates was designed and *** sizes of glass aggregates were selected to be 2.36 and 4.75 mm,and the optimum concentration of nano-Fe2O3 suspension was determined to be 10%.The optimum asphalt content(OAC)was determined by the Marshall method and the glass aggregate *** influence of the glass aggregate content on the technical properties of glasphalt mixtures were analyzed by the rutting test,three-point bending test,freeze-thaw splitting test and skid resistance *** results show that the optimal content of glass aggregates and OAC are recommended to be 15%and 4.4%,*** environmentally-friendly glasphalt mixtures can solve the problem of environmental pollution caused by waste glass,as well as reducing the cost of pavement materials and construction.

关键词： waste glass glass aggregates glasphalt mixtures Nano-Fe2O3 suspension

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多年冻土地区路基工程研究进展

路基工程 2006年第4期 4-6页

作者：裴建中长安大学特殊地区公路工程教育部重点实验室陕西西安710064

全面回顾了多年冻土地区路基工程若干关键技术的研究进展,主要包括路基合理高度、路基中的水热力过程、路基稳定性及路基病害理论、路基病害的预防技术等方面的国内外研究现状与未来发展趋势及进一步研究建议。

关键词：多年冻土地区路基工程研究进展

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高路堤稳定控制技术研究

路基工程 2006年第3期 74-76页

作者：裴建中长安大学特殊地区公路工程教育部重点实验室陕西西安710064

结合新的路基施工技术规范关于高路堤部分的研究与修订,提出了高路堤的施工稳定监控方法、试验工程的实施、冲击与强夯压实技术,最后提出了沉降标准与压实标准建议值。

关键词：高路堤施工监测试验工程压实技术沉降标准压实标准

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连续变温下沥青路面车辙分析与高温预警

同济大学学报（自然科学版） 2011年第2期39卷 242-246,258页

作者：张久鹏裴建中王秉纲长安大学特殊地区公路工程教育部重点实验室陕西西安710064

以南京地区气候特征为例,采用连续变温车辙分析方法模拟不同温度场、不同接地压力下沥青路面车辙的变化规律,分析影响车辙的显著因素,并据此建立考虑气候的日车辙预估模型.结果表明,利用连续变温的路面车辙模拟分析方法可更符合实际地... 详细信息

以南京地区气候特征为例,采用连续变温车辙分析方法模拟不同温度场、不同接地压力下沥青路面车辙的变化规律,分析影响车辙的显著因素,并据此建立考虑气候的日车辙预估模型.结果表明,利用连续变温的路面车辙模拟分析方法可更符合实际地进行车辙模拟分析;车辙主要产生于平均气温高于20℃的高温季节的高温时段,且车辙日发展规律呈"S"曲线.因此以5月份平均气象条件下车辙量为基准,提出以车辙指数IRD为依据的高温预警等级与防护措施.

关键词：沥青路面车辙连续变温车辙指数高温预警

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基于正戊烷沥青质的温拌沥青老化动力性能

东南大学学报（自然科学版） 2014年第5期44卷 1068-1071页

作者：张久鹏杜慧裴建中徐士翠长安大学特殊地区公路工程教育部重点实验室西安710064 广东交通实业投资有限公司广州510100

在不同老化温度和老化时间下,对温拌沥青、基质沥青进行了老化试验,测试了老化前后沥青中正戊烷沥青质含量,建立了以正戊烷沥青质含量为参数的老化动力学模型,计算了老化反应速率常数和老化反应活化能等参数,据此对比研究了温拌沥青与... 详细信息

在不同老化温度和老化时间下,对温拌沥青、基质沥青进行了老化试验,测试了老化前后沥青中正戊烷沥青质含量,建立了以正戊烷沥青质含量为参数的老化动力学模型,计算了老化反应速率常数和老化反应活化能等参数,据此对比研究了温拌沥青与基质沥青的老化动力特性.研究结果表明:沥青老化遵循一级反应动力学方程,老化过程中正戊烷沥青质含量均随时间的延长和温度的升高而增大,而温拌沥青具有较低的反应速率常数和较高的反应活化能,因此抗老化性能更好.以正戊烷沥青质含量为参数的老化动力学方程,能够较好地区分温拌沥青与基质沥青老化过程的差异.

关键词：温拌沥青老化动力学正戊烷沥青质反应速率常数反应活化能