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<p>Accurate prediction of concrete crack development hinges on a thorough understanding of its crack strain behavior. This study employed Digital Image Correlation (DIC) technology to simultaneously quantify crack strain at both micro- and macro-scales in concrete containing fly ash and silica fume, aiming to analyze the differential influence mechanisms of mineral admixtures on concrete cracking behavior. Results indicated that at a 20% dosage, fly ash and silica fume increased microcrack tensile strain by 20% and 48%, respectively, while decreasing microcrack compressive strain by 22% and 59%. Macrocrack strain exhibited a similar decreasing trend to microcrack compressive strain. DIC technology clearly revealed the dual effect of fly ash and silica fume on concrete cracking behavior: they delay crack initiation by optimizing microstructure while promoting crack instability and propagation by increasing matrix brittleness. This discovery provides crucial insights for understanding crack development mechanisms in mineral admixture concrete and optimizing its crack resistance.</p>

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Digital Image Correlation (DIC)-Based Crack Strain Analysis of Concrete Containing Fly Ash and Silica Fume

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Jingwei Ying,
  • Wanfu Qiao,
  • Di Wu,
  • Baixi Chen,
  • Zewen Han,
  • Junzhou Huang

摘要

Accurate prediction of concrete crack development hinges on a thorough understanding of its crack strain behavior. This study employed Digital Image Correlation (DIC) technology to simultaneously quantify crack strain at both micro- and macro-scales in concrete containing fly ash and silica fume, aiming to analyze the differential influence mechanisms of mineral admixtures on concrete cracking behavior. Results indicated that at a 20% dosage, fly ash and silica fume increased microcrack tensile strain by 20% and 48%, respectively, while decreasing microcrack compressive strain by 22% and 59%. Macrocrack strain exhibited a similar decreasing trend to microcrack compressive strain. DIC technology clearly revealed the dual effect of fly ash and silica fume on concrete cracking behavior: they delay crack initiation by optimizing microstructure while promoting crack instability and propagation by increasing matrix brittleness. This discovery provides crucial insights for understanding crack development mechanisms in mineral admixture concrete and optimizing its crack resistance.