共查询到20条相似文献,搜索用时 531 毫秒
1.
2.
为研究不同纤维类型及掺量对微表处混合料路用性能的影响,文章通过室内试验分别对不同掺量的聚丙烯纤维、木质素纤维和玄武岩纤维微表处混合料展开路用性能对比研究,得出以下结论:(1)随着纤维掺量的增加,微表处混合料的抗磨耗性能、抗水损性能及抗轮辙变形性能均呈先减小后增大变化,0.1%纤维微表处的抗磨耗性能及抗水损性能最优,0.2%纤维微表处的抗轮辙变形性能最佳;(2)纤维的掺入能有效抑制微表处混合料裂纹的扩展,增强其低温抗裂性能;(3)综合微表处各项指标试验结果,0.2%玄武岩纤维微表处的路用性能最优,可在预防性养护工程中大规模推广与应用。 相似文献
3.
4.
5.
6.
7.
以具体公路工程沥青路面微表处养护施工为例,进行了微表处混合料设计及施工过程的分析探讨.应用结果表明,微表处沥青路面养护施工技术施工速度快、工效高,微表处摊铺机可同时完成微表处混合料的拌和与摊铺施工,快速提升沥青路面抗滑性、抗磨耗性,还能增强沥青混合料抗车辙能力,且因其厚度较薄,加铺在沥青路面后并不影响排水. 相似文献
8.
9.
将水性环氧树脂与SBR改性乳化沥青进行复配,制备了复合改性乳化沥青,并将其应用于微表处混合料中,通过拌合试验、粘聚力试验、湿轮磨耗试验和负荷车轮碾压试验,研究了微表处混合料的施工性能和路用性能。结果表明:掺加水性环氧树脂使改性乳化沥青针入度和延度降低,软化点升高,抗老化能力增强;微表处混合料可拌合时间随水性环氧掺量和外加水量的增加而延长,推荐外加水量为7%;水性环氧树脂对微表处早期强度有不利影响,应将掺量控制在16%以下;随着水性环氧掺量的增加,1 h湿轮磨耗值先减小后增大,掺量达到8%时,微表处的耐磨耗性能最好;水性环氧树脂增强了微表处混合料水稳定性和抗车辙性能。 相似文献
10.
11.
Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
12.
13.
《Transportation Research Part A: General》1991,25(6):407-418
The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda. 相似文献
14.
介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。 相似文献
15.
明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。 相似文献
16.
天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本. 相似文献
17.
18.
Joseph N. Prashker 《Transportation》1979,8(4):329-346
Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area. 相似文献
19.