集成监控技术在公路隧道中的应用

简要介绍了隧道监控系统的功能特点和发展方向，对隧道集成监控技术和隧道监控的智能化发展进行了分析。     

广西道路客运企业战略转型对策研究

文章阐述了广西道路客运企业转型的必要性和紧迫性,分析了道路客运的优势,提出了道路客运企业转型的基本思路,并深入探讨了道路客运企业转型的对策。     

Estimation of road transport related air pollution in Saint Petersburg using European and Russian calculation models

The paper analyzes Russian and European emission and dispersion models aimed at the estimation of road transport related air pollution on street and regional scale as exemplified with St. Petersburg, Russia. It demonstrates the results of model calculations of peak concentrations of main harmful substances (NО_X, CO and PM₁₀) along the St. Petersburg Ring Road at high traffic volume and adverse meteorological conditions (calm, temperature inversion) executed by means of a Russian street pollution model, and it evaluates the computed results against the measurements from monitoring stations. The paper also examines the ways of adaptation of the COPERT IV model – a software tool for calculation of air pollutant and greenhouse gas emissions from road transport on regional or country scale – to the inventory conditions of the Russian Federation, compares the COPERT IV numerical estimates with the national inventory data. It also reveals the obstacles and possibilities in the harmonization of the Russian and European approaches.     

辽宁地区桥梁混凝土防盐冻腐蚀构造研究

国内外大量桥梁破坏实例表明:混凝土结构不是由于设计强度不够而破坏,而是由于混凝土随时间劣化(耐久性不够)而过早破坏。通过对桥梁防盐冻腐蚀有关构造进行研究,并提出防撞墙、桥面铺装混凝土、主梁、盖梁等防腐构造建议。     

热拌沥青混合料面层施工及质量控制

总结了热拌沥青混合料面层施工的设备要求、材料质量要求、施工工艺要求和监理控制重点,并在多条高速公路中运用,取得了一定的效果,在高速公路施工中可以借鉴。     

水泥混凝土路面设计关键问题探讨

通过分析水泥混凝土路面设计过程中应注意的一些关键问题,从路面结构组成、隔离封层和缓冲封层设置、板块划分、接缝设计、钢筋网等五个方面阐述了相应的设计要点及应注意的问题.     

Do reforms reduce the magnitudes of cost overruns in road projects? Statistical evidence from Norway

Although governments often respond to the prevalent cost overruns of transportation projects by reforming the agencies charged with overseeing the construction of projects, the transportation research literature has not provided statistical evidence as to whether such reforms assist in reducing cost overruns. This paper provides such evidence using the Norwegian road sector as a case study. The agency in question was reformed twice, from a monopolistic to a semi-monopolistic organization, and finally, to a fully competitive organization in which road construction was divided out into a separate company and privatized. In this work, we use statistical inferences to explore the related issues. The data set is composed of 1045 projects evenly distributed across the three organizational forms. The results demonstrate that the impact of the reforms has not been equal. The most important impact occurred in the final reform of full competition in which both the cost overruns and delays in construction among larger projects were greatly reduced. The second reform appears to have had a contrasting impact. For transportation research in general, we call for additional studies that will reveal the extent to which efforts carried out by governments (such as reforms) improve the efficiency of these sectors.     

Assessing greenhouse gas and related air pollutant emissions from road traffic counts: A case study for Mauritius

The road transport sector is one of the major contributors of greenhouse gases and other air pollutants emissions. Regional emissions levels from road vehicles were investigated, in Mauritius, by applying a fuel-based approach. We estimated fuel consumption and air emissions based on traffic counts on the various types of classified roads at three different regional set ups, namely urban, semi urban and rural. The Relative Development Index (RDI), a composite index calculated from socio-economic and environmental indicators was used to classify regions. Our results show that the urban motorways were the most polluting due to heavy traffic. Some rural areas had important pollution levels as well. Our analysis of variance (ANOVA), however, showed little difference in emissions among road types and regions. The study can provide a simple tool for researchers in countries where data are very scarce, as is the case for many developing countries.     

北美岩沥青干湿法改性机理比较分析

文章采用显微镜手段和DSO微观表征手段分别对干法和湿法工艺的北美岩沥青改性机理进行了研究,并对这两种不同工艺生产的沥青混合料性能进行了比较分析。研究结果表明：干法改性的沥青混合料有更好的路用性能。     

防城花岗岩集料及沥青混合料性能的试验评价

为论证防城花岗岩集料在高速公路沥青路面中应用的可行性,文章对花岗岩集料密度、针片状含量、粘附性、压碎值及级配等特性进行了试验分析,并对花岗岩集料沥青混合料AC-25的路用性能进行了检验。结果表明:防城花岗岩集料的吸水率比石灰岩集料的略大0.1%～0.3%、针片状含量偏大,花岗岩集料的粘附性为三级,(0～5)mm石屑的级配偏粗,其高温压碎值满足技术要求;花岗岩沥青混合料AC-25的油石比与石灰岩集料相比约增大0.3%;未掺配抗剥落剂或水泥的花岗岩沥青混合料AC-25的水稳定性能不满足现行规范的技术要求。