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首页> 外文期刊>Magazine of Concrete Research >Crack propagation in concrete at very early ages
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Crack propagation in concrete at very early ages

机译：早期混凝土中的裂纹扩展

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摘要

Surface defects and cracks in early-age concrete slabs have been observed to propagate under adverse conditions, impairing the performance and service life of these structures. However, the underlying mechanism of this form of crack propagation has remained largely unexplained, with very limited literature available. In this paper, simple yet sufficiently rigorous theoretical analyses of crack propagation in early-age concrete slabs, based on combined geotechnical engineering and fracture mechanics models, are presented. The results obtained clearly show how surface cracks can become unstable and propagate further, and either become stable again or develop through the full depth of the slab. They also convincingly demonstrate the roles of surface cracks and defects, pore moisture suctions and exposure conditions in this process. Importantly, the critical role of good construction practices in minimising this form of cracking is highlighted. These include proper compaction and effective curing as well as timely and adequate saw-cutting.
机译：已经观察到早期混凝土板的表面缺陷和裂缝在不利条件下会传播，从而损害了这些结构的性能和使用寿命。但是，这种形式的裂纹扩展的潜在机理在很大程度上尚无法解释，可用的文献非常有限。本文基于岩土工程和断裂力学模型，对简单混凝土板中的裂纹扩展进行了简单而严格的理论分析。所获得的结果清楚地表明了表面裂纹如何变得不稳定并进一步扩展，或者再次变得稳定，或者扩展到整个板坯深度。他们还令人信服地证明了在此过程中表面裂纹和缺陷，毛孔吸力和暴露条件的作用。重要的是，强调了良好的施工规范在最小化这种形式的裂缝中的关键作用。这些措施包括适当的压实和有效的固化，以及及时适当的锯切。

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  • 来源
    《Magazine of Concrete Research》 |2014年第14期|643-651|共9页
  • 作者

    Vinh T. N. Dao; Peter H. Morris; Peter F. Dux;

  • 作者单位

    School of Civil Engineering, University of Queensland, Brisbane, Queensland, Australia;

    School of Civil Engineering, University of Queensland, Brisbane, Queensland, Australia;

    School of Civil Engineering, University of Queensland, Brisbane, Queensland, Australia;

  • 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
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