谈高速公路路面维修养护措施

随着高速公路建设的快速发展,如何有效实施路面的维修养护迫在眉睫。本文就高速公路路面的维修养护措施进行了分析,介绍了微表处技术、信息化技术和含砂雾封层技术这三种公路路面维修养护措施。根据路面的不同情况,选择合适的维修养护措施,不仅提高了路面的使用年限,还减少路面维修养护的费用。     

高速公路路面养护维修工程质量控制

近年来高速公路路面病害不同程度出现,养护维修工程越来越多.重点阐述了高速公路路面维修工程质量控制的各个环节.     

济青高速公路沥青混凝土路面养护维修

从济青高速公路路面病害分析、维修设计及施工管理等几个方面,总结了高速公路路面养护维修管理经验,简要介绍了改性沥青混合料SMA-13型路面结构在济青高速公路路面维修加铺罩面中的应用情况,提出了高速公路路面维修养护施工应注意的问题与建议.     

水泥混凝土路面的养护维修技术应用

对水泥混凝土路面养护维修技术作简要论述,以期提高和完善水泥混凝土路面维修技术,从而进一步推广其应用。     

大粒径透水性沥青混合料基层在东青高速公路路面维修中的应用

在2011年东青高速公路路面维修工程施工中,为能够有效解决路面基层病害的维修处理和缩短高速公路施工工期要求,提高路面基层的抗车辙、抗反射裂缝和抗疲劳性能,采用大粒径透水性沥青混合料基层,配合顶管和碎石盲沟施工工艺处理路面基层病害。     

沥青路面典型剥落病害的成因分析及养护对策

为了解决沥青路面在经过长期使用后产生路面剥落问题,采取科学合理的方案对路面病害进行维修,提出采用路面损坏调查、钻芯取样、弯沉检测等现场检测方法,对A道路沥青路面的表层病害和结构内部情况进行评定和分析,确定路面剥落病害产生的原因,从而提出针对性的路面剥落维修养护对策。     

市政道路复合式路面维修方案探讨

文章以南宁市市政道路复合式路面维修工程为例,探索市政道路复合式路面维修的方案,提出了浅层病害维修、中层病害维修及深层病害维修三种方案,并对反射裂缝的防治进行专门设计,可为类似工程项目提供参考。     

国道322线水泥路改造工程路面使用效果评价

文章对国道322线全州-桂林一级公路维修改造工程的维修方案及各种路面结构设计进行了介绍,并结合改造工程完工后的路面状况调查,评价了各种路面结构的使用效果,推荐了适合于广西水泥砼路面改造的路面结构型式。     

沥青混凝土路面病害维修

半刚性路面基层、沥青混凝土路面的结构,强度和病害发展,分析了路面结构病害产生及维修.     

高液限红黏土路基处理方案经济效益分析

采用高液限红黏土填筑路基会导致路面出现早期破坏,而在工程中不同的路基处理方式其工程效果和经济效果也不相同。文章采用全寿命周期经济理论,以典型路面宽度为10 m的二级公路为代表,统计分析25年内路面维修费用与初期不同路基处理方案的增加费用,比较不同处置方式的综合经济效益以及不同处理方式在不同工程条件下的适用性,为红黏土路基处理方案决策提供依据。     

旧水泥砼路面加铺级配碎石补强层施工工艺探讨

如何有效防治旧水泥混凝土路面上加铺沥青面层产生反射裂缝,是路面修复工程中所面临的一个较普遍问题。文章以国道324线田阳段利用级配碎石作为补强层成功处理该问题为实例,探索了旧水泥砼路面加铺级配碎石补强层的设计与施工方法。     

材料参数变化对沥青加铺层结构应力的影响

采用沥青加铺层结构是修补旧水泥路面的有效方法,但由于旧水泥路面裂缝的存在,沥青加铺层易产生反射裂缝。文章建立三维有限元模型,模拟在交通荷载作用下,通过分别改变加铺层模量、夹层模量、加铺层厚度、夹层厚度以及基础模量,得出加铺层应力响应的变化规律。其结论对实际工程中选取合理的修补方案具有一定的参考意义。     

Traffic modelling in system boundary expansion of road pavement life cycle assessment

This paper uses a case study of a UK inter-urban road, to explore the impact of extending the system boundary of road pavement life cycle assessment (LCA) to include increased traffic emissions due to delays during maintenance. Some previous studies have attempted this but have been limited to hypothetical scenarios or simplified traffic modelling, with no validation or sensitivity analysis. In this study, micro-simulation modelling of traffic was used to estimate emissions caused by delays at road works, for several traffic management options. The emissions were compared to those created by the maintenance operation, estimated using an LCA model. In this case study, the extra traffic emissions caused by delays at road works are relatively small, compared to those from the maintenance process, except for hydrocarbon emissions. However, they are generally close to, or above, the materiality threshold recommended in PAS2050 for estimating carbon footprints, and reach 5–10% when traffic flow levels are increased (hypothetically) or when traffic management is imposed outside times of lowest traffic flow. It is recommended, therefore, that emissions due to traffic disruption at road works should be included within the system boundary of road pavement LCA and carbon footprint studies and should be considered in developing guidelines for environmental product declarations of road pavement maintenance products and services.     

道路透水路面不同面层材料的特性探讨

我国新近应用的透水路面具有很好的应用前景.文章从工程应用角度分析透水沥青混合料、透水水泥混凝土、透水路面砖等三种透水性面层材料的强度特性与耐候性,探讨其常见病害与维护、维修方法.     

柳南路旧路面沥青砼加铺层结构设计方法

结合柳南高速公路旧水泥砼路面改造工程,在综合基础资料调查结果及现有实际经验的基础上,依据加铺层结构设计原则,提出了旧水泥砼路面上沥青加铺层的结构方案,以及保证沥青加铺层使用性能的技术要求与措施。     

A comparative study of the emissions by road maintenance works and the disrupted traffic using life cycle assessment and micro-simulation

Life cycle assessment is being accepted by the road industry to measure such key environmental impacts as the energy consumption and carbon footprint of its materials and laying processes. Previous life cycle studies have indicated that the traffic vehicles account for the majority of fuel consumption and emissions from a road. Contractors and road agencies are looking for road maintenance works that have the least overall environmental impact considering both the roadwork itself and the disrupted traffic. We review life cycle assessment studies and describe the development of a model for pavement construction and maintenance, detailing the methodology and data sources. The model is applied to an asphalt pavement rehabilitation project in the UK, and the micro-simulation program VISSIM is used to model the traffic on that road section. The simulation results are fed into a traffic emissions model and emissions from the roadwork and the traffic are compared. The additional fuel consumption and emissions by the traffic during the roadwork are significant. This indicates that traffic management at road maintenance projects should be included in the life cycle assessment analysis of such work.     

Evaluating the effects of climate change on road maintenance intervention strategies and Life-Cycle Costs

Climate change has the potential to impact long-term road pavement performance. Consequently, to maintain pavements within the same ranges of serviceability as before, current pavement maintenance strategies need to be re-assessed and, if necessary, changed. Changes in maintenance may lead to different agency costs and user costs as a consequence. This paper commences by defining an assessment procedure, showing how maintenance intervention strategies and Life-Cycle Costs (LCC) may be affected by future climate. A typical Virginia flexible pavement structure and anticipated climate change was used as an example. This example is believed to be representative for a great number of localities in the United States. A method using historical climatic data and climate change projections to predict pavement performance using Mechanistic-Empirical Pavement Design Guide (MEPDG) under current or future climate was introduced. Based on pavement performance prediction, maintenance interventions were planned and optimized. The maintenance effects of three treatments (thin overlay, thin overlay with an intermediate layer, and mill & fill) were considered. A Life-Cycle Cost analysis is reported that used binary non-linear programming to minimize the costs (either agency costs or total costs) by optimizing intervention strategies in terms of type and application time. By these means, the differences in maintenance planning and LCC under current and future climate can be derived. It was found, that for this simplified case study, pavement maintenance and LCC may be affected by climate change Optimized maintenance may improve resilience to climate change in terms of intervention strategy and LCC, compared to responsive maintenance.     

Impact of environmental assessment and budgetary restrictions in pavement maintenance decisions: Application to an urban network

Road agencies are facing the challenges of aging pavements, deteriorating networks, and insufficient maintenance budgets. This study addresses two limitations in the current state of practice in pavement management. First, because the evaluation of maintenance strategies has traditionally focused on economic and technical aspects, it neglects the environmental impact of maintenance decisions. Second, current management systems often provide a unique, optimised pavement maintenance strategy based on a specific objective(s) and constraint(s). The main objective of the study is to analyse the effect of including environmental aspects and funding availability in the design of maintenance strategies. To achieve this objective, the study followed a three-step methodology. First, this study reviews existing practices on pavement maintenance and the criteria considered to trigger the application of maintenance treatments and their effects on pavement condition. Then, maintenance strategies are optimised considering three levels of budgetary capacity and a sustainable evaluation which incorporates technical, economic, and environmental aspects over the pavement lifecycle. Finally, a case study dealing with an urban pavement network in Chile is analysed. Results obtained from this case study show that an increment of 2% in maintenance budget allows to account for more sustainable maintenance decisions, such as cold in-place recycling and full-depth slab repair, whose greenhouse gas emissions are lower than other alternatives. Results also show that functional asphalt overlay and microsurfacing are more recommended in flexible pavements when budgetary restrictions are low, whereas recommended treatments for rigid pavements exhibit small variability with budgetary restrictions.     

A multi-year pavement maintenance program using a stochastic simulation-based genetic algorithm approach

The objective of this paper is to introduce a multi-year pavement maintenance programming methodology that can explicitly account for uncertainty in pavement deterioration. This is accomplished with the development of a simulation-based genetic algorithm (GA) approach that is capable of planning the maintenance activities over a multi-year planning period. A stochastic simulation is used to simulate the uncertainty of future pavement conditions based on the calibrated deterioration model while GA is used to handle the combinatorial nature of the network-level pavement maintenance programming. The effects of the uncertainty of pavement deterioration on the maintenance program are investigated using a case study. The results show that programming the maintenance activities using only the expected pavement conditions is likely to underestimate the required maintenance budget and overestimate the performance of pavement network.