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Trajectory Guidance for Connected Human-Driving Vehicles through the Interactions between Drivers and Roadside Units 基于驾驶员与路边单元交互的联网人驾驶车辆轨迹引导
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-7875
Pinlong Cai, Guangquan Lu
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引用次数: 0
Modified Volume-Delay Function Based on Traffic Fundamental Diagram: A Practical Calibration Framework for Estimating Congested and Uncongested Conditions 基于交通基本图的改进体积延迟函数:一种估计拥挤与非拥挤的实用校准框架
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-7903
Yuyan “Annie” Pan, Han Zheng, Jifu Guo, Yanyan Chen
Traffic congestion occurs when there is a mismatch between the demand for road use and the available capacity. The volume-delay function (VDF) can quantify the relationship between travel time and the volume of traffic on a particular link, and also provide insight into the state of a traffic system, such as whether it is congested or uncongested. In this paper, we present a VDF model that is based on the fundamental diagram and has two main components: (1) an improved VDF with fewer parameters that can handle both congested and uncongested traffic conditions, based on a fundamental diagram, and (2) a model-based VDF practical calibration framework for practical traffic applications that can determine key parameters for a link in a corridor. Our experiments using corridors in Los Angeles and Beijing demonstrate that our proposed analytical methods effectively calculate road impedance under congested conditions. The results indicate that the proposed model is superior to other existing models in terms of the root mean squared error (RMSE) and mean absolute error (MAE). In addition, our calibrated results indicate that the travel time index (TTI) in Los Angeles is 2.12, in Beijing is 1.74. The model proposed in this paper provides a useful calibration tool for enhancing model performance and improving the accuracy of travel time and speed estimates in traffic assignment.
当道路使用需求与可用容量不匹配时,就会出现交通挤塞。容量延迟函数(VDF)可以量化特定路段上的旅行时间和交通量之间的关系,还可以洞察交通系统的状态,例如是否拥挤或不拥挤。在本文中,我们提出了一个基于基本图的VDF模型,该模型有两个主要组成部分:(1)基于基本图的改进的参数较少的VDF,可以处理拥塞和非拥塞交通状况;(2)基于模型的VDF实际校准框架,用于实际交通应用,可以确定走廊中链路的关键参数。我们在洛杉矶和北京的走廊上进行的实验表明,我们提出的分析方法有效地计算了拥堵条件下的道路阻抗。结果表明,该模型在均方根误差(RMSE)和平均绝对误差(MAE)方面优于现有模型。此外,我们的校准结果表明,洛杉矶的旅行时间指数(TTI)为2.12,北京为1.74。本文提出的模型为提高模型性能,提高交通分配中行驶时间和速度估计的准确性提供了一个有用的标定工具。
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引用次数: 1
Improved Speed Control Strategy for Mixed Traffic Flow Considering Roadside Unit 考虑路边单元的混合交通流改进速度控制策略
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-7428
Wei Hao, Donglei Rong, Zhaolei Zhang, Young-Ji Byon, Daxin Tian
The information exchange among vehicles and road infrastructure with wide sensing range can be accomplished by roadside units (RSUs). Communication delays occur and are influenced by different approaches of deployment of RSUs, which increases the complexity of vehicle automatic control in a mixed traffic flow. Therefore, a speed control strategy was proposed for mixed traffic flow considering RSU deployment distance, interaction radius, and communication delay, aimed at enhancing traffic safety and efficiency. The characteristics of RSU deployment were modeled as functions, where an adaptive efficiency function was proposed to evaluate different RSU deployment plans. An improved speed control model was then developed based on the characteristics of the RSU in the mixed traffic flow. In addition, numerical analysis and simulation were carried out to evaluate vehicle stability and traffic throughput based on the improved speed control model. The analysis results show that the proposed model is stable under different updating frequencies, with the best stability achieved when the velocity update frequency is 500 and the velocity update time interval is 0.01 s. Moreover, it was found that the spatial occupancy rate increases with the increment of penetration rate of autonomous vehicles, which improves the rate by at least 20% compared to the no-control scenario. Additionally, the average speed is also increased by 30% while under the influence of communication delays. This paper investigated the relationship between characteristics of RSUs and traffic performances, which is essential for DOTs to develop an effective RSU plan to adapt to the mixed traffic flow.
具有宽传感范围的车辆与道路基础设施之间的信息交换可以通过路边单元(rsu)来完成。在混合交通流中,不同的rsu部署方式会对通信延迟产生影响,从而增加了车辆自动控制的复杂性。为此,提出了一种考虑RSU部署距离、交互半径和通信时延的混合交通流速度控制策略,以提高交通安全和效率。将RSU部署的特征建模为函数,提出了一种自适应效率函数来评估不同的RSU部署方案。基于混合交通流中RSU的特性,建立了改进的速度控制模型。此外,基于改进的速度控制模型,对车辆稳定性和交通吞吐量进行了数值分析和仿真。分析结果表明,所提模型在不同更新频率下都是稳定的,其中速度更新频率为500、速度更新时间间隔为0.01 s时稳定性最好。此外,研究发现,随着自动驾驶汽车渗透率的增加,空间占用率也会增加,与无控制场景相比,空间占用率至少提高了20%。此外,在通信延迟的影响下,平均速度也提高了30%。本文研究了道路交通单元特征与交通性能之间的关系,为制定适应混合交通流的有效道路交通单元方案提供了理论依据。
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引用次数: 0
Passenger-Oriented Resilience Assessment of an Urban Rail Transit Network under Partial Disturbances 局部扰动下面向乘客的城市轨道交通网络弹性评价
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-8017
Jinqu Chen, Xiaowei Liu, Bo Du, Wenxin Li, Yong Yin, Xinyue Xu
In daily operation, urban rail transit (URT) systems often experience disturbances that result in a partial reduction in transport capacity [partial disturbances (PDs)] rather than disturbances leading to a complete reduction in transport capacity. However, research that assesses the resilience of URT networks under PDs remains limited. This paper addresses this gap by proposing a passenger-oriented resilience assessment model for URT networks under PDs, considering the travel behaviors of passengers and different relations (i.e., linear, concave, and convex) between the velocity coefficient and failure severity. A simulation-based assessment approach was developed to solve the resilience assessment model. A numerical experiment was conducted on the Chengdu subway network in China. The results demonstrate that the performance indicator employed herein reflects the impact of passenger travel time distribution on network performance. Deliberate PDs cause more significant performance losses than random PDs. Moreover, the network is the least resilient under PDs considering the convex relation between the velocity coefficient and failure severity. The resilience-based critical link of each line is not fixed and varies with the failure severity and disturbance occurrence time. Increasing the failure severity of PDs results in more severe performance losses than increasing the number of PDs. Additionally, the passenger-oriented resilience of a URT network can be enhanced by improving the passengers’ tolerable delay time and disturbance duration.
在日常运行中,城市轨道交通(URT)系统经常会遇到导致运输能力部分减少的干扰[部分干扰(pd)],而不是导致运输能力完全减少的干扰。然而,评估pd下URT网络弹性的研究仍然有限。本文通过考虑乘客的出行行为以及速度系数与故障严重程度之间的不同关系(线性、凹形和凸形),提出了一种面向乘客的轨道交通网络弹性评估模型,解决了这一空白。提出了一种基于仿真的评估方法来求解弹性评估模型。对中国成都地铁网络进行了数值试验。结果表明,本文所采用的性能指标反映了乘客出行时间分布对网络性能的影响。故意pd比随机pd造成更大的性能损失。考虑速度系数与故障严重程度之间的凸关系,网络在pd下的弹性最小。每条线路基于弹性的关键环节不是固定的,而是随着故障严重程度和扰动发生时间的变化而变化。增加pd的故障严重程度会导致比增加pd数量更严重的性能损失。此外,可以通过提高乘客的可容忍延迟时间和干扰持续时间来增强轨道交通网络面向乘客的弹性。
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引用次数: 0
Evaluation of Motorway Lane Control Strategies for Mixed Flow of Autonomous and Human-Driven Vehicles 自动驾驶与人工驾驶混合流高速公路车道控制策略评价
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-7870
Yu Sun, Erik Jenelius, Wilco Burghout, Binglei Xie
The introduction of automated vehicles (AVs) is commonly expected to improve different aspects of transportation. A long transition period in which AVs will coexist with human-driven vehicles (HVs) is expected until AVs become prevalent. Dedicated lane strategy is considered an effective way to improve road capacity and promote AV use. However, there is a lack of comprehensive research on when and how to implement lane management strategies, and further verification is needed to determine to what extent lane management strategies will affect traffic flow. The dedicated lane strategy will first be applied in highway scenarios, and the merging area is an important zone prone to congestion on highways. There are many impacts of AV on the merging area of highways, but research on the issue that the traffic flow is continually affected after the completion of merging is still lacking. Therefore, this study establishes a lane control strategies framework to investigate the effect on road capacity on the multilane freeway after the merging area. This paper explores the traffic performance of three different lane control strategies with mixed AV/HV traffic flow and investigate when the tested strategies make sense and how sensitive they are to varying AV rates and demands. Specifically, using the open-source microscopic traffic simulation tool SUMO, this study investigates the impacts on traffic performance in terms of throughput, travel time and space mean speed on two-lane motorways at increasing penetration rates of AVs. Moreover, three different lane control strategies (two mixed lanes, one reserved AV lane, and one reserved HV lane) are compared under various demand and AV rates. The simulation results demonstrate that road capacity increases convexly with AV rates. In addition, the results show that the capacity on a one-way two-lane motorway road can be improved with appropriate lane control strategies, especially under high demand and at low to medium AV rates.Practical ApplicationsThe simulation experiments are described in this study, in which a SUMO-based study is designed to evaluate the different capacities for pure HV or AV traffic, and different lane control strategies under different AV rates and traffic demands, together with the results and the traffic performance in terms of changes in capacity, by measuring throughput. We first evaluate the traffic performance of three different lane control strategies with mixed AV/HV traffic flow and investigate when the tested strategies make sense and how sensitive they are to varying AV rates and demands. According to the results, lane strategy can improve traffic capacity. Based on the giving quantized extent of the capacity improvement, the authorities can make decisions on when and how to deploy to dedicated lanes systematically. Lane strategies can significantly improve traffic performance; it should be deployed first on highways, as there is less interference, especially in merging areas, wh
人们普遍期望自动驾驶汽车(AVs)的引入能够改善交通的各个方面。预计在无人驾驶汽车普及之前,无人驾驶汽车将与人类驾驶的汽车(hv)共存,这将是一个漫长的过渡期。专用车道策略被认为是提高道路通行能力和促进自动驾驶汽车使用的有效途径。然而,对于何时以及如何实施车道管理策略缺乏全面的研究,需要进一步验证来确定车道管理策略对交通流的影响程度。专用车道策略首先应用于高速公路场景,而合并区是高速公路上容易发生拥堵的重要区域。自动驾驶汽车对高速公路合流区域的影响是多方面的,但对合流完成后交通流持续受到影响的问题的研究还比较缺乏。因此,本研究建立了车道控制策略框架,研究合并区后对多车道高速公路通行能力的影响。本文研究了三种不同的车道控制策略在AV/HV混合交通流下的交通性能,并研究了测试策略在什么情况下有效,以及它们对不同的AV率和需求有多敏感。具体而言,本研究利用开源微观交通模拟工具SUMO,从吞吐量、行驶时间和空间平均速度三个方面考察了自动驾驶汽车普及率提高对双车道高速公路交通性能的影响。此外,还比较了不同需求和AV率下的3种车道控制策略(2条混合车道、1条保留AV车道和1条保留HV车道)。仿真结果表明,道路通行能力随自驾车率呈凸增长。此外,研究结果还表明,采用适当的车道控制策略可以提高单双车道高速公路的通行能力,特别是在高需求和中低AV率的情况下。本文通过仿真实验,设计了一种基于sumo的研究方法,通过测量吞吐量来评估纯HV或AV交通在不同AV速率和交通需求下的不同通行能力,以及不同车道控制策略,以及结果和随通行能力变化的交通性能。我们首先评估了三种不同的车道控制策略在混合AV/HV交通流下的交通性能,并研究了测试策略何时有意义,以及它们对不同的AV率和需求有多敏感。结果表明,车道策略可以提高通行能力。基于容量改善的量化程度,当局可以系统地决定何时以及如何部署专用车道。车道策略能显著改善交通性能;它应该首先部署在高速公路上,因为干扰较少,特别是在容易发生交通拥堵的合并地区。后续的测试可以在不同的道路环境中进行,以获得更全面的结果。
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引用次数: 0
Static and Dynamic Scheduling Method of Demand-Responsive Feeder Transit for High-Speed Railway Hub Area 高速铁路枢纽区需求响应支线交通静态与动态调度方法
Q Engineering Pub Date : 2023-11-01 DOI: 10.1061/jtepbs.teeng-7838
Yiqi Hou, Min Yang, Lichao Wang, Mingye Zhang, Da Lei
Demand-responsive feeder transit (DRFT) is an emerging urban public transport mode with the advantage of offering flexible door-to-door services in the high-speed railway hub area. However, the existing bus scheduling schemes can hardly meet personalized and diversified passenger transfer demands in the station-city integrated high-speed railway hub, reducing the attractiveness of DRFT. This paper studies the DRFT scheduling problem considering static and dynamic travel demands under the background of mobility as a service (MaaS). An information-based DRFT system framework is proposed, where the K-means clustering algorithm is implemented to select target bus stops from regional road networks for passengers to get on and off. A two-stage mixed integer programming model is first formulated to generate operational routes and optimize the static and dynamic scheduling before and after departure. The objective functions reflect the operating benefits of public transport enterprises and the travel costs of passengers, and the demand characteristics in different driving directions are taken into account in the model. Then, an improved genetic algorithm is developed to solve the model, which is called the genetic algorithm-exact algorithm (GA-EA) in this paper. Finally, the proposed model and algorithm are evaluated using the case study of the Nanjingnan Railway Station area. The experiment results show that the optimal scheme can provide a 100% demand-response rate, reasonable service time, and valid driving routes. In addition, compared with GA, the average search time of GA-EA is shortened by 43.5% and the total objective function value is increased by 2.16%. The findings in this paper can provide practical guidance on DRFT scheduling and improve the efficiency of bus feeder service.
需求响应式支线交通(DRFT)是一种新兴的城市公共交通方式,具有在高速铁路枢纽地区提供灵活的门到门服务的优势。然而,现有的公交调度方案难以满足站城一体化高铁枢纽个性化、多样化的换乘需求,降低了DRFT的吸引力。研究了移动即服务(MaaS)背景下考虑静态和动态出行需求的DRFT调度问题。提出了一种基于信息的DRFT系统框架,利用k均值聚类算法从区域路网中选择目标公交站点供乘客上下车。首先建立了两阶段混合整数规划模型,生成运行路线,优化出发前后的静态和动态调度。目标函数反映了公共交通企业的经营效益和乘客的出行成本,并考虑了不同行驶方向的需求特征。然后,提出了一种改进的遗传算法来求解该模型,本文称之为遗传算法-精确算法(GA-EA)。最后,以南京火车站区域为例,对所提出的模型和算法进行了评价。实验结果表明,该优化方案能够提供100%的需求响应率、合理的服务时间和有效的行驶路线。与遗传算法相比,GA- ea算法的平均搜索时间缩短43.5%,总目标函数值提高2.16%。本文的研究结果可为公交接驳调度提供实用指导,提高公交接驳服务效率。
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引用次数: 0
Pavement Monitoring Using Unmanned Aerial Vehicles: An Overview 使用无人驾驶飞行器的路面监测:概述
Q Engineering Pub Date : 2023-09-01 DOI: 10.1061/jpeodx.pveng-1291
Pranav R. T. Peddinti, Harish Puppala, Byungmin Kim
Pavement monitoring involves periodic damage detection and condition assessment of pavements for efficient pavement management. Unmanned aerial vehicle (UAV)-based pavement monitoring requires multidisciplinary knowledge of pavement distress, drone type, payload, flight parameters, drone deployment, and image processing. Owing to the availability of various UAVs, data sensing devices, operating ecosystems, and post-processing tools, selecting an appropriate combination of these systems is crucial. Therefore, the primary objective of this study is to provide essential knowledge on the prevalent challenges of existing monitoring techniques and discuss the potential advantages of UAVs over conventional pavement monitoring practice. A state-of-the-art review emphasizing UAV technicalities in the context of image-based pavement monitoring is presented. A detailed workflow and checklist for drone deployment is drafted for novice users to ensure safe and high-quality data acquisition. Finally, the present challenges and future scope of UAV-based pavement monitoring is discussed. Overall, this study aims to provide inclusive and comprehensive information on UAV-based pavement monitoring to beginner researchers.
路面监测包括对路面的定期损伤检测和状况评估,以实现有效的路面管理。基于无人机(UAV)的路面监测需要多学科知识,包括路面破损、无人机类型、有效载荷、飞行参数、无人机部署和图像处理。由于各种无人机、数据传感设备、操作生态系统和后处理工具的可用性,选择这些系统的适当组合至关重要。因此,本研究的主要目的是提供有关现有监测技术普遍挑战的基本知识,并讨论无人机相对于传统路面监测实践的潜在优势。在基于图像的路面监测的背景下,强调无人机技术的最新审查被提出。为新手用户起草了无人机部署的详细工作流程和检查表,以确保安全和高质量的数据采集。最后,讨论了基于无人机的路面监测面临的挑战和未来的发展方向。总的来说,本研究旨在为初学者提供基于无人机的路面监测的全面信息。
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引用次数: 0
Analyzing Pedestrian Fatality Risk in a Developing Country: Empirical Assessment with Insights from Dar es Salaam, Tanzania 发展中国家行人死亡风险分析:基于坦桑尼亚达累斯萨拉姆的实证评估
Q Engineering Pub Date : 2023-09-01 DOI: 10.1061/jtepbs.teeng-7803
Henry P. Sawaki, John H. Kodi, Angela E. Kitali, Emmanuel Kidando, Geophrey Mbatta
Pedestrian safety is a critical societal concern, especially in low-income countries, as pedestrian crashes increase worldwide. Among other road users, pedestrians are most vulnerable to severe injury and mortality in traffic crashes. Several studies have examined factors associated with the severity of pedestrian crashes in developed countries. However, there are limited comprehensive studies on pedestrian safety in low-income countries. Therefore, this study explored factors influencing the severity of pedestrian crashes in Dar es Salaam, Tanzania, using a Bayesian logit model. The analysis involved 1,711 pedestrian crashes collected manually from the police logbook from 2015 through 2021. The results showed that young pedestrians (35 years and younger) are likely to sustain fatal injuries when involved in a crash. A higher fatality risk was also observed for pedestrian–vehicle crashes that occurred during winter and on streets. Crashes occurring at locations with wider medians and involving older pedestrians (55+) had a lower probability of a fatality. Identifying these risk factors for pedestrians provides valuable inputs that will assist with developing a comprehensive pedestrian safety action plan.
行人安全是一个重要的社会问题,特别是在低收入国家,因为世界范围内行人碰撞事故不断增加。在其他道路使用者中,行人最容易在交通事故中受到严重伤害和死亡。在发达国家,有几项研究调查了与行人撞车严重程度相关的因素。然而,对低收入国家行人安全的综合研究有限。因此,本研究采用贝叶斯逻辑模型探讨了坦桑尼亚达累斯萨拉姆行人碰撞严重程度的影响因素。该分析涉及从2015年至2021年的警察日志中手动收集的1711起行人撞车事故。结果表明,年轻行人(35岁及以下)在发生碰撞时很可能遭受致命伤害。在冬季和街道上发生的行人与车辆碰撞也有较高的死亡风险。发生在中位数较宽且涉及老年行人(55岁以上)的撞车事故的死亡概率较低。识别行人的这些风险因素,将有助于制定全面的行人安全行动计划。
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引用次数: 0
Evaluation of Bicycle Network Connectivity Using Graph Theory and Level of Traffic Stress 基于图论和交通压力水平的自行车网络连通性评价
Q Engineering Pub Date : 2023-09-01 DOI: 10.1061/jtepbs.teeng-7776
Md Mintu Miah, Stephen P. Mattingly, Kate Kyung Hyun
The quality of the bicycle network determines ridership, safety, connectivity, equity, and livability. Very few former research studies investigated network connectivity for individual user types and identify network needs and barriers based on these rider types. This study measures the network connectivity for different rider types using level of traffic stress (LTS) and graph theory concepts. As a symbolic representation of a road network and its connectivity, a graph represents the structural properties of networks and compares one measure over another by taking into account spatial features. In addition, this study defines a bicycle network for different types of riders using LTS metrics based on traffic speed, road geometry, and traffic volume. This study evaluates the OpenStreetMap (OSM) bicycle network for Portland, Oregon, as a case study. Three transit stations in the downtown, riverside, and residential area were considered to assess the connectivity and barriers with a home at block level for last and first-mile coverage. The analysis shows that 29% of links in Portland need to be improved with more bicycle facilities to provide access to basic adult riders, and 33% of links require improvement for children. The networks are well connected for “strong and fearless” and “confident and enthused” users but not well connected for basic adults and children in many neighborhoods with low alpha and grid tree pattern (GTP) indices. The results indicate that planners and designers need to improve their network connectivity for all types of users to ensure equal active transportation opportunities beyond a particular portion of the network.Practical ApplicationsIn general, a well-connected network is important to provide the shortest route from origin to destination and safe traveling paths for all ages of people. It is critical for cities or government agencies to understand how their network is connected to different users because this knowledge will provide a fundamental basis for resource prioritizations on bicycle network improvement. This study developed a strategy using traffic stress and geometric properties of the network to assess their network connectivity. Practitioners can apply these techniques on a small scale (e.g., around transit stations) as well as large scale (e.g., entire city network) to identify the network connectivity. This study extends the applications to evaluate transportation equity in bicycle networks using served/ unserved populations where disparities in network connectivity exist to favor higher-income people.
自行车网络的质量决定了乘客数量、安全性、连接性、公平性和宜居性。以前很少有研究调查个人用户类型的网络连接,并根据这些用户类型确定网络需求和障碍。本研究使用交通压力水平(LTS)和图论概念来测量不同乘客类型的网络连通性。作为道路网络及其连通性的象征性表示,图形表示网络的结构属性,并通过考虑空间特征来比较不同的测量。此外,本研究使用基于交通速度、道路几何形状和交通量的LTS指标定义了不同类型骑行者的自行车网络。本研究以俄勒冈州波特兰市的开放街道地图(OSM)自行车网络为例进行了评估。市中心、河边和住宅区的三个交通站点被认为是评估最后和第一英里覆盖范围内街区水平的住宅的连通性和障碍。分析显示,波特兰29%的道路需要改善,增加更多的自行车设施,为基本的成年骑手提供通道,33%的道路需要改善,以供儿童使用。对于“坚强无畏”和“自信热情”的用户,网络连接良好,但对于许多alpha和网格树模式(GTP)指数较低的社区的基本成人和儿童,网络连接不佳。研究结果表明,规划师和设计师需要为所有类型的用户改善网络连通性,以确保在网络的特定部分之外有平等的主动交通机会。一般来说,一个连接良好的网络对于为所有年龄段的人提供从起点到目的地的最短路线和安全的旅行路径非常重要。对于城市或政府机构来说,了解他们的网络如何连接到不同的用户是至关重要的,因为这些知识将为改善自行车网络的资源优先级提供基本基础。本研究开发了一种利用交通压力和网络几何特性来评估其网络连通性的策略。从业者可以在小规模(例如,在交通站点周围)和大规模(例如,整个城市网络)上应用这些技术来识别网络连接。本研究扩展了应用程序,以评估自行车网络中的交通公平性,使用服务/未服务人群,其中网络连通性存在有利于高收入人群的差异。
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引用次数: 0
Effects of Liquefied Waste Plastics on Chemical and Rheological Properties of Bitumen 废塑料液化对沥青化学和流变性能的影响
Q Engineering Pub Date : 2023-06-01 DOI: 10.1061/jpeodx.pveng-1153
Albert M. Hung, Mingxia Li, Guoxiong Wu, Elham H. Fini
This paper studies the merits of applying liquified polyethylene (PE) as a modifier for bitumen. Chemical recycling of PE is often incomplete and generates some amount of waste “PE oil”. The viscoelasticity and chemical characteristics of bitumen modified with PE oil were examined using dynamic shear rheometry, infrared spectroscopy, and adhesion measurements in comparison and in conjunction with bitumen modified with wax, which is one of the most common additives in warm-mix bitumen. The study found that PE oil softens bitumen without severely increasing the creep compliance or viscoelastic damping properties. Wax-modified bitumen showed enrichment of crystallized alkanes at the free bitumen surface that negatively impacted adhesion and interface healing. The introduction of PE oil to wax-modified bitumen did not appreciably decrease the fraction of crystallized wax. Thus, PE oil may not be effective as an additive for warm-mix wax-modified bitumen. However, the PE oil showed potential in protecting bitumen against ultraviolet (UV) aging, and it is worth further exploration as an anti-aging agent, or as a rejuvenator for reclaimed asphalt pavement. The outcomes of this study promote plastic recycling by presenting the merits of applications of liquefied waste PE in the design and engineering of bituminous composites.
研究了液化聚乙烯(PE)作为沥青改性剂的优点。PE的化学回收往往不完全,产生一定量的“PE油”废弃物。采用动态剪切流变法、红外光谱法和附着力测量方法对PE油改性沥青的粘弹性和化学特性进行了研究,并与温混合沥青中最常见的添加剂之一蜡改性沥青进行了比较。研究发现,PE油软化沥青,但不会严重增加其蠕变特性或粘弹性阻尼特性。蜡改性沥青在自由沥青表面有丰富的结晶烷烃,这对粘结力和界面愈合产生不利影响。在蜡改性沥青中掺入PE油并没有明显降低蜡的结晶率。因此,PE油可能不能有效地作为热混合蜡改性沥青的添加剂。然而,PE油在保护沥青抗紫外线老化方面显示出潜力,值得进一步探索作为抗老化剂或再生沥青路面的再生剂。本研究结果通过展示液化废PE在沥青复合材料设计和工程中的应用优点,促进了塑料的回收利用。
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引用次数: 0
期刊
Journal of Transportation Engineering
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