Life cycle assessment of bituminous pavements produced at various temperatures in the Belgium context

Bituminous mixture is the premier material for road construction in Belgium. Innovative technologies to improve energy efficiency of pavement constructions are necessary. Warm mix asphalt may provide significant energy savings to the asphalt industry, but the environmental impact of the total life cycle has to be investigated. The use of additives may counteract the reduced environmental impact due to energy savings. This paper presents the results of an environmental impact assessment of four wearing course test sections. Using life cycle assessment, hot mix asphalt is compared to a cold asphalt mix with emulsion and warm mix asphalt with two types of additives: a synthetic zeolite and an organic Fischer–Tropsch wax. Neither hot nor warm mix asphalt could be preferred based on the results of this study, because the additive has a major influence on the environmental results. It was seen that the production of bitumen, the transport and energy in order to generate heat mainly contribute to the total environmental impact. The results from the sensitivity analyses show that the total environmental impact of the life of the pavement can vary significantly based on the choice of the specific data source and service life.     

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.     

旧水泥砼路面加铺沥青面层结构技术经济分析

文章结合某高速公路水泥混凝土路面大修情况,介绍不同路段采用不同的加铺沥青层设计方案,并就路面维修建设费用和使用寿命间的经济关系进行分析和研究,为同类维修项目提供参考。     

Factors affecting the environmental impact of pavement wear

Wear at the interface between flexible pavements and tires influences pavement life, pavement cycle costs, and tire consumption, and is a source of environmental harm. Wear-related processes evolve over time and are affected by a number of boundary conditions, such as interface fluids, water and fuels. We develop a model explaining and predicting mass losses in flexible pavements under carefully controlled conditions, and with estimation of the related environmental costs. We also employed an accelerated loading test. Under normal conditions, the environmental impact of pavement wear is not greatly influenced by mix type or volumetrics. Indeed, the presence of hazmat materials, traditional, dense mixes have an environmental impact that is appreciably lower than that of porous European mixes.     

岩沥青改性沥青混合料应用技术和效益分析

岩沥青改性剂是天然的改性剂,加工合成不会造成环境污染,而且岩沥青改性剂与普通的沥青改性剂相比造价低,因此岩沥青改性剂具有良好的经济和社会效益。本文详细介绍了岩沥青改性剂优点,并通过路面实体工程的分析,证明了岩沥青改性沥青混合料的技术性能和效益优越,是一种值得推广的路面改性剂。     

高等级公路路面施工技术

文章从企业的发展历程入手,介绍了企业的高等级公路路面施工及设备情况,详细阐述了SBS改性沥青、GTM试验配合比、沥青混凝土转运车及非接触式平衡梁、SMA混合料的推广应用,为推进高等级公路路面施工技术发展奠定了坚实的基础。     

Multi-objective optimization for asphalt pavement maintenance plans at project level: Integrating performance,cost and environment

Traditionally, asphalt pavement maintenance mainly considers pavement performance and cost and largely ignores the environment while substantial amount of environmental burdens are released in the process. In this study, a multi-objective optimization model was developed integrating the three elements in order to optimize the asphalt pavement maintenance plans at the project level. Pavement performance element was decided as the multiplier of pavement serviceability index and traffic volume. Cost element was represented by the net present value, including components of agency cost, vehicle operation cost and salvage value. Environmental element, integrating energy consumption, global warming potential, acidification potential and respiratory effects potential, was measured by the life cycle assessment model. A hypothetic asphalt pavement maintenance case study was conducted using the developed multi-objective optimization model and harvested 103 sets of feasible combinations of maintenance plans, each of which is non-dominated by the others. Trade-offs analysis was performed among the three objectives and visualized in both two- and three-dimension forms. It is found there is an opportunity of reducing the cost and environmental impacts to 80.3% and 77.8% and increasing the pavement performance to 146.6% compared to the base case. However, they are mutually compromised and cannot be reached simultaneously. The developed model reveals the quantitatively interactive relationship of the three objectives and helps optimize the asphalt pavement maintenance plans.     

试论沥青路面材料的再生工艺及专用机械设备的发展

沥青混凝土路面是目前国内外道路交通的主要面层结构,而沥青材料的热溶解特性,使沥青混合料能够较为容易地实现再生利用。作为节能减排和固废利用的重要组成部分,沥青混合料再生利用的工程规模及其技术进步也反映了一个国家或地区国民经济的发展和技术进步的总体水平。注重并优化沥青混凝土路面材料的再生工艺,并以符合技术条件的专用设备完成作业是路面材料高质量再生利用的前提和必要条件。     

沥青路面冷再生沥青混合料配合比设计研究

冷再生沥青混合料施工技术是一种节能环保的公路路面修复技术,不但可以有效减少石料、沥青、水泥的需求量,降低工程成本,减少了资源浪费,并且与热再生技术相比可以有效降低CO2排放量。配合比设计是影响冷再生沥青混合料质量的关键因素,本文以某公路沥青路面修复工程为例,对沥青路面冷再生沥青混合料配合比进行研究,以加强冷再生沥青混合料质量控制。     

SAWI在水泥混凝土路面薄层罩面中的应用

文章结合广清高速公路水泥混凝土薄层罩面结构设计实例,介绍了应用高弹改性沥青应力吸收层（SAWI）的水泥混凝土加铺薄沥青层的路面结构设计过程,阐述了SAWI的性能特点与施工质量控制的方法和重点,并对其实际使用性能进行了跟踪检测。结果表明：应用SAWI的水泥混凝土薄沥青层加铺技术可较好地抵抗反射裂缝,并能减少路面厚度,降低工程造价,是一项具备良好发展前景的水泥路面加铺新技术。     

彩色沥青路面的应用与发展

彩色沥青路面作为功能性路面和景观道路,已引起了人们的广泛关注与重视.文章结合国内外彩色沥青路面的发展现状,介绍了彩色沥青路面的种类、设备、相关指标标准、配合比设计及施工工艺等,指出了彩色沥青路面目前存在的主要问题,为开展相关研究提供参考.     

沥青路面动力响应分析方法研究

西部交通建设科技项目"沥青路面动力响应分析方法研究"旨在建立车辆-道路系统动力学模型,研究高速重载车辆荷载作用下沥青路面结构的动力响应情况,分析动力载荷对沥青路面结构使用性能的影响,从而提出适合重载交通条件的沥青路面动力响应理论分析方法。本篇对该项目的技术创新点、主要研究成果、社会经济效益及推广应用前景进行了介绍,为今后沥青路面的结构改造与设计提供理论依据。     

热拌沥青混合料降温规律试验研究

文章通过室内试验,对不同摊铺厚度及环境温度下的不同基质沥青、级配类型的热拌沥青混合料的降温情况进行研究,得出了热拌沥青混合料的降温规律,为热拌沥青混合料的室内试验及生产施工控制提供参考依据。     

The effect of time on acoustic durability of low noise pavements – The case studies in Poland

The tyre/road noise depends on type and speed of vehicles and on the characteristics of road pavement. Vehicle traffic load and weather conditions lead to significant changes in the characteristics of the materials used to build the wearing course. This applies especially to road pavements with the increased void contents. Clogging of the pores, changes in the characteristics of the binder and the damage to the wearing course influence changes in the acoustic properties of the road pavement over time. The article presents the results of the studies on noise level carried out in 2011 and 2014 by the Statistical Pass-By method (SPB) on porous asphalt concrete (PAC), very thin asphalt concrete (VTAC) and stone mastic asphalt (SMA). The wearing courses with the increased void contents immediately after building constitute a very advantageous solution compared with traditional road pavements (dense asphalt concrete, stone mastic asphalt). However, the unfavourable location of the road with porous wearing course, lack of systematic cleaning of porous layers or inappropriate maintenance methods in winter lead to the loss of the acoustic durability of low-noise pavements within a few years of their exploitation.     

多功能沥青路面检测机器人设计探讨

在沥青混凝土路面施工工艺中,温度、摊铺厚度以及压实度的良好控制是确保沥青路面质量的重要保证,从而使公路沥青路面检测在施工质量控制与保障方面显得尤为重要。文章开发设计出一种沥青路面检测机器人,替代沥青路面检测人员的人工检测职能,以求降低劳动强度,减少高温、核子仪带来的各种风险,提高施工安全性能以及沥青路面施工质量。     

多孔沥青混合料路面降温机理研究

如何降低路面高温、减少城市热岛效应影响成为了近年来一个较为关注的问题。文章通过分析多孔沥青混凝土路面的热环境,提出多孔沥青混凝土路面的降温原理及方式。     

沥青混凝土路面机群施工评价指标体系探讨

在沥青混凝土路面机械化施工中,当施工条件或工况发生变化时,机械的联合作业系数就会相应产生变化,进而导致整个施工系统的运行状态产生波动。文章从顾客排队长度、机械联合作业系数、沥青混凝土施工温度、机械班台费的损失和利用率五个方面,建立了沥青混凝土机群施工系统的评价指标体系,并分析了机械化施工作业技术经济性评价指标,提出了各指标的具体计算方法。     

柳州绕城高速公路沥青路面施工质量控制

文章结合广西柳州国道过境公路雒容-洛满段高速公路沥青路面施工工程实例,介绍了影响沥青路面施工质量的几个关键环节,指出了沥青路面施工的质量控制要点,为沥青混凝土路面的设计与施工提供借鉴。     

RAC-13橡胶沥青混合料级配设计及路用性能分析

文章结合隆百高速公路橡胶沥青混凝土复合式路面工程实例,介绍了RAC-13橡胶沥青混合料的原材料组成及其性能指标,并对5种级配设计方案的路用性能进行了对比分析,提出了RAC-13橡胶沥青混合料的级配范围,为薄层橡胶沥青复合式路面的设计与施工提供借鉴。     

钢箱梁桥面环氧沥青铺装施工工艺

通过环氧沥青混凝土铺装施工技术,探讨在气候恶劣、建设条件复杂的桥区,进行大规模环氧沥青混凝土铺装的施工工艺改进情况。