矿区构筑物耐久性影响因素分析

INFLUENTIAL FACTORS ANALYSIS ON DURABILITY OF CONCRETE STRUCTURES IN COAL MINE AREA

  • 摘要: 和其它地区一样,矿区混凝土结构的耐久性问题也逐渐得到了人们的重视。以平顶山煤业集团的地面生产构筑物为例,结合环境对建筑的可能的腐蚀因素进行了分析。通过矿区的大气环境和降水环境的全面监测,结合对矿区构筑物的无损检测,定性地表明二氧化碳的碳化和冻融破坏是导致混凝土结构耐久性下降的主要环境因素。另一个腐蚀原因是生产构筑物的使用年限问题,当前矿区一些混凝土构件已经超过其设计年限,导致其耐久性的下降。而通过对不同时间段和不同环境段的结构构件的混凝土强度降低率比较,认为使用年限是首要的影响因素,而大气环境是次要的影响因素。最后提出了今后矿区在设计构筑物时要注意的一些问题。

     

    Abstract: The durability issues of concrete structures have received extensive attention in coal mine area. Using the surface structures in Pingdingshan Coal Group as examples, some possible factors that influence concrete members are analyzed. By using atmosphere and rainfall monitoring, it is found that concrete carbonization and frost-and-thaw damage are the main environment factors influencing the concrete durability .More importantly, structure service life is another key influential factor and the durability of some structures that have been in service longer than its design life have severely decreased. Based on comparison of the reduced rate of concrete strength in different environment and for different service life spans, it is concluded that service life is the primary influential factor and atmospheric environmental is the secondary one. Finally, some measures for improving the structure durability were presented in the paper.

     

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