• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>The International Conference on Durability of Concrete Structures（2008年混凝土结构耐久性国际学术会议）论文集 >MODELING THE INFLUENCE OF STRESS LEVEL ON CHLORIDE TRANSPORT IN PRESTRESSED CONCRETE
【24h】

MODELING THE INFLUENCE OF STRESS LEVEL ON CHLORIDE TRANSPORT IN PRESTRESSED CONCRETE

机译：应力水平对预应力混凝土中氯离子输运的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The concrete under the state of tension or compression stress can influence themicro-structure of inner composite materials,and consequently change some properties ofconcrete,such as porosity and permeability. Therefore,the chloride transport in saturatedconcrete will also be influenced by the stress level of concrete because the transport processdepends on the porosity of concrete. In this study,three series of stressed concrete specimenswith W/C=0.40 and 0.50,Series A,Series B and Series C (compression stress,tension stressand none stress states,respectively),were subjected to accelerated salt fog aggressiveexperiment. The test results indicate that the chloride content at certain depth decreases withincreasing compressive stress levels while increases with increasing tensile stress levels,especially for high W/C specimens. Then,the surface chloride diffusion coefficient,Dsurf,iscalculated with error function solution when the diffusion is considered as the mainmechanism of chloride transport. And several factors influencing the chloride diffusioncoefficient in concrete are analyzed and the influential coefficient of concrete stress level isproposed particularly in this study. By comparing the calculated Dsurf,an approximately linearrelationship between diffusion coefficient and stress level is obtained.
机译：混凝土在拉伸或压缩应力状态下会影响内部复合材料的微观结构，从而改变混凝土的某些性能，例如孔隙率和渗透率。因此，氯化物在饱和混凝土中的传输也将受混凝土应力水平的影响，因为传输过程取决于混凝土的孔隙率。本研究分别对3个系列的W / C = 0.40和0.50的A系列，B系列和C系列应力混凝土标本（分别为压缩应力，拉伸应力和无应力状态）进行了盐雾侵蚀性加速实验。测试结果表明，在一定深度下，氯化物含量在压缩应力水平升高的情况下降低，而在拉伸应力水平升高的情况下则增加，特别是对于高W / C试样。然后，当扩散被认为是氯离子迁移的主要机理时，利用误差函数解计算了表面氯离子的扩散系数Dsurf。并分析了影响混凝土中氯离子扩散系数的几个因素，并提出了混凝土应力水平的影响系数。通过比较计算的Dsurf，获得扩散系数与应力水平之间的近似线性关系。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号