Modelling the performance of pavement marking in cold weather conditions

Inadequate and poorly maintained pavement markings are considered to be one of the largest contributing factors to fatal motor vehicle crashes. As a result, it is essential to apply the appropriate pavement marking material for all weather conditions in order to increase public safety and reduce motor vehicle crashes. Building a strategic plan to renew and re-stripe pavement marking is receiving increasing interest from companies/authorities that manage the pavement marking in order to reach the most cost-efficient management plan of the available pavement marking materials. The objective of this paper is to develop pavement marking performance models that predict the condition of different marking materials under various service conditions including weather, traffic and snow removal plans. The developed models are validated and the results show that the average percent validity varies from 87% to 99%. Marking performance is assessed using a condition rating scale, which numerically ranges from 1 to 5 and linguistically from excellent to critical, respectively. Deterioration curves are developed that assess the condition of the pavement marking based on the developed models. They are expected to benefit academics and practitioners (municipal engineers, consultants, and contractors) to prioritise inspection, stripping, and re-stripping planning for various pavement markings.     

浅谈路面管理系统的发展状况及趋势

通过对世界范围内路面管理系统的研究,总体介绍了路面管理系统的发展状况,并详细阐述了路面管理系统的发展趋势,从而协调各项路面活动,促使路面管理过程系统化。     

Aggregate and disaggregate statistical evaluation of the performance-based effectiveness of long-term pavement performance specific pavement study-5 (LTPP SPS-5) flexible pavement rehabilitation treatments

Engineers continually seek effective techniques for preserving highway infrastructure. Using data from the specific pavement study#5 of the long-term pavement performance (LTPP) programme's western region, this article evaluated the performance of eight flexible pavement rehabilitation treatments. Aggregate and disaggregate post-treatment performance models were developed for each treatment. Effectiveness was measured in the short term (roughness reduction) and long term (estimated treatment service life and area bounded by the performance curve (ABP)). The results showed that compared to 2-inch treatments, 5-inch treatments were on average more effective in terms of the following measures: 47% (estimated service life) and 35% (ABP) depending on the level of surface preparation, mix type and initial pavement condition. Also, relative to minimal surface preparation, intensive surface preparation generally yielded greater effectiveness: 25% (estimated service life) and 49% (ABP) depending on added thickness, mix type and initial pavement condition. Compared to recycled mix treatments, virgin mix was marginally more effective. Finally, compared to pavements treated in poor condition, those treated in good condition were significantly more effective. Treatment effectiveness models were developed for predicting the expected effectiveness of future treatments on the basis of attributes such as treatment type, added layer thickness, level of surface preparation and mix type.     

影响沥青混凝土路面平整度因素的探讨

分析了影响沥青路面平整度的几个因素，并针对此问题，提出了各主要施工环节相应的处理措施，以提高沥青路面的平整度，从而提高经济效益和社会效益。     

A condition assessment method for roadside assets

Infrastructure condition assessments provide key information for monitoring the quality of infrastructure, planning and budgeting of maintenance and rehabilitation activities and establishing performance goals. Although the literature is rich in condition assessment methods for roadway pavement and bridges (and to some extent for traffic signs), it is lacking such methods for roadside assets. This paper describes the development and validation of a condition assessment method for 12 roadside asset types and maintenance activities that are related to roadway safety, drainage, cleanliness and vegetation. These assets and maintenance activities are located in the area between the outside edges of the outside shoulders and the right-of-way boundaries. On divided highways, the median is also included. The developed condition assessment method consists of a set of performance standards, a visual inspection procedure to assess compliance with these standards and a statistical analysis procedure to determine the roadside level of service. To test and validate the developed method, it was applied to five highway corridors in Texas, USA, representing different climatic conditions, topography, traffic volume and population density (urban vs. rural). These field trials provided insights into the developed method, including practicality, reproducibility and probability distribution function which best represents the sample unit score.     

影响沥青路面平整度的因素

通过对路基和路面平整度、沥青混凝土的拌和质量、摊铺机械及摊铺工艺、压实机械及碾压工艺、纵横施工缝的处理等的分析,提出了影响沥青混凝土路面平整度的因素及相应的解决处理方法,从而提高路面平整度,延长道路使用寿命。     

影响沥青路面平整度的因素分析

通过祁临高速沥青面层施工实践,从热拌沥青混合料的质量、沥青混合料的摊铺、碾压工艺、接缝处理、摊铺机的使用与操作、基层的平整度等方面对影响沥青混凝土面层平整度的因素及注意事项进行了介绍,以保证沥青路面质量。     

浅析影响沥青混凝土路面平整度的因素

路基、基层、面层施工三方面分析了影响沥青混凝土路面平整度的因素，并提出了施工中应注意的有关问题．以保证公路的使用功能，发挥其最佳效益。     

水泥混凝土路面破碎板病害成因分析及处治

调查分析了某国道水泥混凝土路面破碎板病害,认为其主要成因包括交通量过大、超载严重、基层处理不善、面板设计厚度不足以及施工质量等,在正确分析的基础上,介绍了对该二级路段所采用的基于碎石化技术和破碎稳固技术的病害处治方案。     

Estimation of pavement rehabilitation cost using pavement management data

Estimation and scheduling of future pavement maintenance and rehabilitation (M&R) works are one of the primary concerns of highway agencies due to the limited allocations in budget and resources. Two approximate methods for estimation of pavement rehabilitation cost are presented and compared in this study based on highway present condition index (HPCI) and rehabilitation history. The former is based on pavement condition, while the latter is based on historical and statistical trends. Database from a pavement management system (PMS) of various highway sections surveyed in Korea were used in this study to establish a relationship between HPCI and pavement service life and to analyse the trends of rehabilitation periods. The two simple methods presented provide useful information and probable range for the various highway agencies to guide them in the preliminary planning, budgeting, estimating and scheduling of their future pavement M&R works.     

影响沥青路面平整度的原因及控制方法

针对沥青路面平整度的重要性,分析了影响沥青路面平整度的因素,并针对性地提出了提高沥青路面平整度的措施,以提高沥青路面的平整度水平,从而提高沥青路面的舒适度,延长道路的使用寿命.     

沥青路面施工中的质量控制研究

结合沥青路面施工中原材料、机械设备的选择、试验路段的试拌试铺、沥青混合料施工的质量控制及接缝的质量控制等几个重要环节,介绍了沥青路面质量控制的重点,用以指导沥青路面的施工。     

考虑层间状态的沥青路面温度与荷载耦合行为分析

沥青路面是典型的层状体系,层间黏结状态的好差直接影响到路面的使用性能.采用三维非线性有限元软件ABAQUS,同时考虑沥青混合料的劲度模量随温度变化的特性,数值模拟计算了沥青路面在不同温度场状况下分别与水平及竖向荷载耦合作用的关键力学响应,分析各响应指标随层间接触状态变化的特性.研究结果表明由于接触模型作用机理的不同,其关键力学指标响应要比连续模型下的大;除路表竖向变形大小几乎与层间接触状态无关外,其他指标在低温状况下,层间接触条件变化对其影响较小,而在高温状况下,特别当层间接触摩擦系数μ＜0.6时影响很大,尤其对基层、底基层的最大拉应力及面层的最大剪应力影响显著.研究成果为科学解释沥青路面在不同环境温度与车辆荷载综合作用下的破损特征与行为机理提供了有力依据,为改善层问黏结条件有利于提高路面整体性能提供了理论支撑.     

沥青路面水损坏的影响因素和对策分析

结合工作实践,从水的来源、施工因素、重载交通等角度分析了我国高速公路上水损坏产生的原因和影响因素,并提出了相应的处治对策,以期提高沥青路面质量,确保运行安全。     

城市沥青路面大修方案的探讨

根据东环大道沥青路面破坏的现状、成因分析、使用质量评价,着重对不同沥青路面大修方案的优缺点进行了分析、比较,为沥青路面大修提供一条值得借鉴的思路.     

高温条件下沥青路面结构剪应变分析

温度和应力荷载的耦合效应是评价沥青路面结构稳定性的关键因素。温度梯度和外荷载是路面结构变形和破坏的直接原因。基于沥青混合料热粘弹变形理论,建立了高温动态载荷作用下路面破坏的耦合动力学模型,模拟分析了沥青路面温度场和应力场的分布规律以及影响沥青路面破坏的关键因素。模拟结果与监测结果基本一致,表明该模型用于沥青路面日变温度分析是可靠的。天气情况对监测结果有很大影响,温度变化直接影响模量,进而影响压缩性和抗剪强度,但对竖向应力影响不大。通过对不同温度下沥青路面变形的监测和模拟结果的比较,进一步验证了模型的可靠性,为沥青路面的优化设计和损坏控制技术提供了关键参数。     

水泥混凝土路面碎石化改造技术介绍

介绍了碎石化技术的起源、概念及相关设备,阐述了水泥混凝土路面碎石化改造技术的工艺流程及施工要求,并通过工程实例的分析,得出碎石化技术的应用带来了显著的综合效益,可推广应用。     

对影响沥青混凝土路面平整度因素的分析

简述了高等级公路建设中平整度的重要性，对影响沥青混凝土路面平整度的因素进行了分析，并论述了相应的提高沥青混凝土路面的措施，以提高沥青路面的平整度，从而达到提高汽车行驶速度、平稳性、舒适性的目的。     

探讨抑制冻结铺装的效果

通过不同温度条件下冰附着强度试验,进行了物理系和化学系抑制冻结铺装的抑制结冰能力研究,结果显示物理化学综合类抑制冻结铺装在不同温度条件下均有较好的抑制结冰效果。     

影响沥青路面平整度的因素及改善措施

分析了影响沥青路面不平整产生的主要原因，从路基压实、基层养护、摊铺、碾压、接缝处理等方面介绍了提高路基及路面基层平整度的措施，以确保路面施工质量。