浅层压浆技术在提高沥青混凝土路面强度中的应用

重点介绍浅层压浆技术在惠河高速公路提高沥青砼路面强度中的实践应用,解决了路面结构强度不足的问题,保证了行车舒适性和安全性。该施工工艺费用低、操作简单、工效高。     

水下容器开启过程流场特性仿真研究

水下容器开启过程中,海水快速灌入容器内,对载体的平衡产生较大的影响.采用Mixture多相流计算模型求解气液两相流场,网格更新方法采用域动分层法,对不同开启角度进行数值计算.结果表明:开启角度越小,容器底部压力和容器内部进水量波动越大,且峰值越大,随着开启角度的增大,两者波动范围有所减缓,研究成果可为水下容器总体设计、系统使用流程优化提供理论支撑.     

6000DWT沥青船液货梯级加热系统设计

提出一种利用船舶主机余热的沥青船液货梯级加热系统,包括四个加热回路,即缸套冷却水余热提取环路、废气热油锅炉环路、燃油热油锅炉环路、沥青加热环路和相应的控制装置。该加热系统可以实现船舶主机缸套冷却水余热、废气余热的梯级利用。经过经济性计算,该系统可节省燃料60%以上,十二个航程便可收回增加的设备投资,节能效果明显。     

Short-term statistics of ice loads on ship bow frames in floe ice fields: Full-scale measurements in the Antarctic ocean

Ship operation and ice loading in floe ice fields have received considerable interest during recent years. There have been several numerical simulators developed by different institutes which can simulate ship navigation through floe ice fields and estimate ship performance and local ice loads. However, public data obtained from full-scale measurement covering comprehensively ship performance and ice loads under various ice thicknesses, concentrations and floe sizes are rare. The 2018/19 Antarctic voyage of the Polar Supply and Research Vessel (PSRV) S.A. Agulhas II gathered considerable data of the ship in floe ice fields under various thicknesses, concentrations, and floe sizes. The aim of this paper is to carry out statistical analysis to seek suitable probability distributions which adequately fit the measured ice load and therefore suitable to be used as parent distributions for long-term estimation. For this aim, three categories of probability distributions, namely standard distributions, truncated distributions and mixture distributions are tested. It is found that truncated distributions can fit the load data better than standard distributions bounded at the threshold. In addition, mixture distributions are shown to have promising features, which fit the data well and are able to separate distribution components. Subsequentially, the well-performed distributions are used as parent distributions to make long-term load estimations. The estimation results demonstrate that long-term estimations are sensitive to the selection of parent distribution, which addresses the importance of finding correct distribution to model short-term ice loads. The data of ten selected cases will be published for the use of other researchers.     

VGELES1800型摊铺机故障分析一例

以 VO¨ GEL E S180 0型摊铺机在摊铺工作中出现的故障为例 ,介绍了分析、解决问题的全过程 ,着重分析了熨平板严重磨损后对摊铺造成的影响 ,并提出了减轻熨平板磨损的几项措施。     

沥青混凝土路面冷铣刨机的性能试验与参数优化

沥青混凝土路面冷铣刨机的设计理论尚不完善,为了探索其设计理论和方法,本文依据实物试验和理论分析,确定了沥青混凝土路面冷铣刨机各性能参数较合理的匹配关系,为该机型的设计提供了依据.     

沥青路面早期破坏原因分析与防治

主要介绍了沥青路面早期破坏原因及防治措施。     

天然岩沥青对沥青路用性能的影响研究

采用布敦岩沥青及国产青川岩沥青分别对基质沥青进行改性,应用动态剪切流变试验、低温弯曲梁流变试验及旋转薄膜老化试验,全面研究岩沥青类型及掺量对沥青的高温流变性能、低温流变性能和抗老化性等路用性能的影响。试验结果表明:岩沥青的掺加对基质沥青的路用性能具有良好的改善作用;对于不同类型岩沥青,沥青的高温流变性能均随着岩沥青掺量的不断增大而不断改善,低温流变性能则略有降低,抗老化性能不断增强;在相同岩沥青掺量条件下,国产青川岩沥青对沥青的高温性能、低温性能及抗老化性能等路用性能的改善效果均优于布敦岩沥青。     

沪宁高速公路常州段沥青中,下面层机械化施工

以沪宁高速公路常州段路面工程为例，介绍了工程用材料的规格、质量要求以及施工机械的配套，并且详细介绍了沥青混凝土中下面层机械化施工概况。     

Tyre/road noise damping characteristics using nomographs and fundamental vibroacoustical relationships

Several studies have successfully developed laboratory and field measurement techniques to estimate tyre/road noise damping characteristics. However, laboratory–field noise correlations of pavement types in the form of nomographs is essential to cognize the pavements’ acoustical properties from a practical perspective. A toolkit that readily provides field tyre/road noise intensity of different pavement materials is needed. Thus, the main objective of this study was to develop nomographs with relationships for tyre/road noise versus pavement materials’ viscoelastic–vibroacoustical properties. Isothermal and isochronal nomographs of phase angle–tyre/road noise as toolkits were developed based upon well-established phase angle and noise intensities typical of mixtures, making the nomograph correlations very authentic, realistic, and novel along with benefit to predict tyre/road noise at any desired temperature and traffic speed (or frequency) combination. This study is envisaged to benefit in the discernment of road materials’ damping capabilities from vibroacoustical and field noise–viscoelastic relation aspects.