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首页> 外文期刊>Magazine of Concrete Research >Bleeding and evaporation in concrete slabs with sequential placement
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Bleeding and evaporation in concrete slabs with sequential placement

机译:顺序放置的混凝土板的流血和蒸发

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摘要

An analytical method that can predict the occurrence of plastic shrinkage cracking in sequentially placed concrete slabs is proposed on the basis of a numerical model introduced in previous studies by the current authors. The influence on plastic shrinkage cracking of design variables such as the number of placement steps and the time interval between layers is quantitatively analysed through parametric studies using the previously introduced analytical method. In addition, two regression equations that take into account the effect of the sequential placement on plastic shrinkage cracking in concrete slabs are introduced. The first estimates the time at which the surface of the concrete slab begins to dry and the second determines the critical time interval to prevent surface drying in each concrete layer. The timing of the curing and the sequence of concrete placement, which are important factors in the prevention of plastic shrinkage cracking, can be planned effectively using the introduced equations without rigorous analysis.
机译:在现有作者先前的研究中引入的数值模型的基础上,提出了一种可预测顺序放置的混凝土板中塑性收缩裂纹的发生的分析方法。使用先前介绍的分析方法通过参数研究定量分析了设计变量(例如放置步骤的数量和层之间的时间间隔)对塑性收缩开裂的影响。此外,引入了两个回归方程,这些方程考虑了顺序放置对混凝土板塑性收缩裂缝的影响。第一个估计混凝土板表面开始干燥的时间,第二个确定防止每个混凝土层表面干燥的临界时间间隔。固化时间和混凝土浇注顺序是防止塑性收缩开裂的重要因素,可以使用引入的方程式进行有效规划,而无需进行严格的分析。

著录项

  • 来源
    《Magazine of Concrete Research》 |2008年第10期|p.769-783|共15页
  • 作者

    H.-G. Kwak; S.-J. Ha;

  • 作者单位

    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701,South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水泥工业;
  • 关键词

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