FRP抗剪加固混凝土梁的研究进展及展望

对混凝土梁构件进行抗剪加固可以有效提高其受剪承载力,避免脆性破坏模式地发生.对FRP抗剪加固混凝土梁的研究进展进行了较为系统的归纳与总结,并在此基础上作了展望.     

浅析柴油机拉缸的成因及预防措施

拉缸是柴油机常见的故障之一,直接影响柴油机的经济性、动力性和可靠性。文章介绍了船舶柴油机拉缸的主要征兆,分析了柴油机发生拉缸的原因,提出了针对柴油机拉缸所采取的相应措施。     

二次投料配制钢纤维粉煤灰混凝土、粉煤灰混凝土试验研究

利用粉煤灰材料活性，对二次投料原理，通过室内试配钢纤维粉煤灰混凝土和粉灰混凝土试验，以及铺筑试验路段的验证，表明该材料能满足路面强度要求，还可降低水泥用量和工程造价。     

浅谈普通混凝土配合比设计在实践应用中的问题及解决方法

普通混凝土配合比设计中常见的几个问题和解决方法。     

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.     

论混凝土拱桥施工中常见病及预防措施

介绍了混凝土拱桥施工中常见病及预防措施。     

混凝土结构裂缝成因分析与对策

混凝土结构的裂缝直接影响到构造物的使用安全并减少了构造物的使用寿命及使用年限。简要介绍混凝土结构裂缝的产生原因并探讨混凝土结构裂缝的防治和施工控制。     

水泥混凝土路面翘曲脱空与面板破坏原因分析

文章针对广西近年来水泥混凝土路面翘曲脱空与面板破坏的情况,分析产生病害的原因,介绍采用有限元程序对翘曲脱空后的路面在荷载作用下的受力进行计算的方法,对翘曲脱空后的路面寿命进行预估,同时提出翘曲脱空的防治对策。     

Impacts of trade related sustainability strategies on freight transportation: Modelling framework and application for France

The circular and functional economies are being presented in the literature as potential strategies for future sustainable societies. In terms of the consequences for supply chains, they will promote a much more dispersed and diversified, local and network based usage of goods than the current economy, which is comparatively linear, concentrated, long distance oriented and scale economy based. A gap in the literature is the assessment of the effects of these systems on freight transport flows. In our paper, we present a first attempt at estimating this impact using freight transport scenario building and quantitative modelling. In order to translate the main parameters that characterize these systems into factors determining freight transportation volumes, we develop a framework based on a typology of goods categories describing functional and spatial proximity between producers and consumers. In order to simulate changes in the economy, we develop scenarios for the shifting of goods from one category to another and, additionally, include internalization policies that should guide their realization. We calculate the impacts on freight flows using a new interregional transport model for France that includes distribution chains and produces estimates of external costs of transport. Our results show that circular and functional economies could lead to a 2–5% reduction of air pollutant emissions and up to a 14–26% reduction if combined with the internalization of external costs. The scenario with ongoing mass production for differentiated demand is found to lead to a 5% increase of environmental impacts compared to the baseline.