县乡公路改建工程中路面平整度的控制措施

平整度是衡量沥青路面质量好坏的重要指标.不平整现象主要包括路面出现坑凹、接缝台阶、波浪、碾压车辙、桥涵与路面接茬不平、跳车等.对改建公路工程中沥青路面产生不平整的原因及处理措施进行了论述.     

水泥路面改沥青路面施工技术

水泥路面改沥青路面是当前常见的路面改造工程之一。文章探讨了水泥路面改沥青路面的施工技术,从旧路面病害处理、沥青混凝土面层施工工艺以及沥青路面层施工质量控制、成品保护等方面详细阐述了处理要点。     

道路路面平整度的若干问题

随着高等级公路的迅速发展,对于路面平整度要求越来越高,路面平整度的合格率既反映了行车舒适程度,又反映了施工队伍的水平。近年来,马平、平西高速、西湟倒一级公路、宁大高速、平阿高速修补时出现了不同程度的波浪、沉陷、碾压车辙、跳车等路面不平整现象,就出现的某些现象借此分析,提出沥青路面产生不平整的原因及处理措施。     

沥青路面的离析控制

沥青路面离析是高等级公路路面早期损坏的一个重要原因,结合日常监督检测的经验,从沥青路面离析的成因、检测及防治等方面,论述了沥青路面的离析控制.     

浅析沥青路面水损害及防治

随着我国高等级公路的迅速发展,沥青路面作为一种高级路面被广泛采用,然而沥青路面却易出现早期损害现象,主要表现在坑槽、松散、脱皮、麻面等方面.产生这些病害的主要原因是水的损害.从沥青路面设计、施工及管理等方面谈谈水对沥青路面造成的损害及预防措施.     

基于沥青路面半刚性结构的破损研究及评价

半刚性基层路面的性能评价是对路面养护、铺装、维护的有力依据。然而依据现行公路技术评价体系对西部高速公路进行评价时,路面状况指数经常超限。针对这一问题,文章基于国内外沥青路面破损及评价研究现状,从计算弯沉值、路面结构强度指数PSSI、路面车辙状况RDI等方面,研究了半刚性基层沥青路面结构破损状况的计算方法,并结合工程实例进行了应用分析,为沥青路面半刚性结构破损评价提供理论依据。     

提高沥青路面压实度的对策分析

路面压实度是影响沥青路面使用年限的一项重要指标,本文从混合料性质、摊铺碾压温度、压实工艺等方面分析、探讨提高沥青路面压实度的对策。     

高速公路改能扩建工程技术难点分析

本文以青海省西宁至互助公路扩能改建工程中关键技术为例,分别研究了该项目的路线选线、路基路面拼接、桥涵拼接、交通组织规划等。提出了高速公路路线选线、路基路面、桥涵拼接关键技术、交通组织方案的的注意事项。     

沥青路面温缩裂缝的成因与防治

论述了沥青混凝土路面低温开裂机理:严冬期温度骤降导致的横向收缩裂缝、温度疲劳导致的裂缝、反射导致的裂缝;论述了沥青路面低温开裂的影响因素:沥青性质、沥青混和料的组成、路面结构、基层等;提出了从沥青及沥青混和料、路面结构、施工等三个方面防治高原沥青路面温缩裂缝的措施。     

高等级路面水损坏处理措施

高等级沥青路面水稳性不足影响路面的整体稳定性和强度,从而降低路面的耐久性.根据沥青混合料配合比、组成材料要求和施工控制等方面,分析高等级路面水损坏处理措施.     

Modelling of the pavement acoustic longevity in Hong Kong through machine learning techniques

Traffic noise emission has long been a pervasive environmental and ecological problem, especially in the metropolitan cities with large-scale traffic network and high population density. Low noise road surface (LNRS) has been actively developed and applied as an effective measure to maintain the quieter environment of mobility service system. However, when LNRS is applied for noise abatement, the relationship between the acoustic performance and degradation of pavement has not been fully understood yet. To this end, this study aims to model the acoustic longevity of asphalt pavement as a function of the thickness, binder content, maximum aggregate size, and air void content of the pavement surface, as well as vehicle speed based on the long-term tyre-road noise data collected from 270 asphalt pavement sections in Hong Kong. Two machine learning techniques, namely artificial neural networks (ANN) and support vector machines (SVM), were employed and compared. It was found that both ANN and SVM could successfully model the pavement acoustic performance with acceptable model performance metrics. A case study showed that the ANN model was more aligned with the aging mechanisms of porous road surface, but the SVM model showed better training performance. The predicted acoustic deterioration rates of the porous surface case varied from −0.1 to 0.28 dB(A)/month rather than keeping a constant linear increasing trend, depending on pavement ageing periods and vehicle speed levels. The two-dimension sensitivity analysis (2D-SA) revealed the relative importance of pavement age and vehicle speed in controlling the acoustic performance.     

旧水泥砼路面加铺沥青砼的施工技术探讨

文章通过对肇庆市国道G321线高要市小湘至封开涌口段路面大修工程实例进行分析,介绍了该路段在旧水泥混凝土路面上加铺沥青混凝土路面的设计方案、施工及质量控制方法,为此类工程提供借鉴。     

基于材料就地再生的多功能养护车作业工艺及经济效益分析

多功能养护车是完成沥青路面病害快速处置的现代化作业机具,而将路面材料的就地再生利用作为养护车的标准配置是其作业功能的重要拓展,且是道路养护现代化的主要标志之一。探讨路面材料再生工艺及相关技术参数的优化对于保证和提高再生材料的路用质量、降低加热能源消耗和环境保护具有重要的现实意义。     

Comparisons of the environmental footprint of heavy vehicles in the UK and Switzerland

The European Union project Eureka Logchain Footprint is an ongoing project to identify road and rail vehicles by means of their environmental footprint as characterised by dynamic load, noise, ground borne vibrations and gaseous emissions induced by the vehicle. Part of the project involves the installation of road and rail footprint monitoring stations throughout Europe. This paper presents results of the road stations in Switzerland and the UK. Individual vehicle data from weigh-in-motion and noise are compared. The results indicate that a significant number of vehicles surpass the limits set in both countries. It was shown that the UK sites are generating higher noise levels than their Swiss counterparts; in part due to the much coarser aggregate embedded in the running course of the pavement employed in the UK. Such data can be used to create an incentive for vehicle types with a low footprint and a penalty for vehicles with a large footprint.     

沥青路面抗滑性能影响因素识别研究进展

沥青路面作为公路建设的重要内容,其抗滑性能是道路安全问题的核心,探究其影响因素可以为提高路面抗滑性能提供依据。国内外学者对此做了大量研究,也取得了相应的进展。本文对国内外的研究成果进行了系统的归纳总结,将公路沥青路面抗滑性能影响因素分为了沥青混合料的材料特性、环境因素、车辆特性3个主要方面,其中在沥青混合料的材料特性方面,研究认为集料的结构特性与混合料配合比对抗滑性的影响较大;环境因素方面,研究认为温度对于抗滑性的影响较大;车辆特性对抗滑性的影响方面,研究认为主要体现在轮胎特性与荷载方面。此外随着行车速度的增加,路面的抗滑性能呈现降低趋势。     

国道大修工程沥青混凝土路面缺陷控制

沥青混凝土路面的结构设计及施工过程中对离析缺陷的控制,直接决定沥青混凝土面层的路面使用性能和使用寿命。文章结合G321国道肇庆市西段路面大修工程沥青混凝土路面的结构设计及施工工艺,介绍了在沥青混凝土路面施工过程中如何加强对离析等路面缺陷的控制。     

浅析沥青路面性能衰减规律

文章通过对重庆成渝高速公路某段运行后的车流量及路面性能状况进行调查,分析其路面病害状况及产生的原因,研究其路面衰减的规律,并针对各个阶段的路面性能,制定出适宜的养护方案。     

Comparative life-cycle assessment of conventional (double lane) and non-conventional (turbo and flower) roundabout intersections

This research studied and compared different construction techniques for the road subgrade, embankment and pavement of different types of roundabout intersections in order to assess their environmental sustainability. A Life Cycle Assessment (LCA) was carried out on double lane, turbo- and flower roundabouts.We considered virgin materials and reclaimed asphalt pavement (RAP) for the pavement construction. Also the environmental effects due to in situ lime stabilization of fine-grained soils were assessed in order to reduce the use of virgin material in road subgrades.The use of reclaimed asphalt pavement (RAP) can lead to a significant reduction in pollutant emissions and energy consumption (especially due to the lesser material transport) – though with a slightly different impact according to the different percentages employed – compared to the pavements constructed with virgin materials. The same consideration can be made for fine soils with in situ lime stabilization: on the one hand, the technique allows to improve significantly the mechanical properties of soils which would be otherwise dumped and, on the other, to provide considerable environmental benefits. The life cycle assessment of the pavement was carried out with the help of the PaLATE software (by comparing different maintenance scenarios) while emissions and energy consumption in the use phase at intersections were evaluated by means of closed-form models (to estimate vehicle delays and speeds of vehicles) and the COPERT software.Finally, the generalized costs covered in the whole life cycle of roundabouts (i.e. sum of construction, maintenance and environmental costs) were assessed and associated to the different construction options.     

The road network management system in Slovakia

Traffic on the road network in Slovakia is increasing greatly, as a result of the country's location in central Europe. In recent years, transit truck traffic has exceeded the network's capacity causing many accidents, low vehicle speed and rapid degradation of the pavement. To deal with this situation a Road Network Management System (RNMS) has been developed. This system is based on national standards that evaluate road parameters, characteristics, and traffic levels and on new methods that consider the environmental impact and methods based on international standards (HDM III). Using these, the RNMS was developed as one homogeneous unit, not only in terms of its capacity, traffic level and economic efficiency, but also to evaluate individual sections, to optimize action, and prepare a rehabilitation budget. It took only five years to develop the RNMS because Slovakia has much relevant experience based on high level research in highway design, structural pavement design and material engineering.     

浅析影响沥青路面压实的因素

压实是影响沥青路面耐用性能最重要的因素之一。文章结合桂林灵川一三塘高速公路A标段沥青路面施工的实际情况,探讨沥青路面的压实对沥青路面性能的影响,为提高沥青混合料的压实质量和沥青路面的使用品质提供参考。