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<p>This study systematically investigates the microcracking behavior of granite under high-temperature conditions with particular emphasis on the influence of heating rate. Controlled experiments were conducted on granite specimens at various heating rates, specifically 2.0&#xa0;°C/min, 5.0&#xa0;°C/min, 10.0&#xa0;°C/min, 15.0&#xa0;°C/min, and 20.0&#xa0;°C/min, with the target temperatures set at 100&#xa0;°C, 300&#xa0;°C, 500&#xa0;°C, and 600&#xa0;°C. The internal microstructure of thermally treated specimens was visualized using X-ray computed tomography (CT), enabling quantitative analysis of key parameters including areal porosity, volumetric porosity, fractal dimension, and crack size distribution. Results demonstrate that heating rate effects become significant above 300&#xa0;°C. Between 300&#xa0;°C and 600&#xa0;°C, areal porosity, volumetric porosity, and fractal dimension all increase with higher heating rates, while remaining largely rate-insensitive below this temperature threshold. The fractal dimension of microdefects remains below 1.0 at temperatures under 300&#xa0;°C, indicating that microdefects primarily exist as isolated pores. Above 500&#xa0;°C, the fractal dimension consistently exceeds 1.0, marking a transition to a crack-dominated microstructure. Additionally, at elevated temperatures, increased heating rates promote the development of medium- and large-scale cracks while reducing the population of small-scale cracks. These findings provide crucial insights into the thermal degradation mechanisms of granite under varying thermal loading conditions.</p>

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How heating rate governs microcrack-induced damage revealed by X-ray computed tomography?

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • L. F. Fan,
  • H. Y. Fan,
  • B. Qiu,
  • Q. H. Yang

摘要

This study systematically investigates the microcracking behavior of granite under high-temperature conditions with particular emphasis on the influence of heating rate. Controlled experiments were conducted on granite specimens at various heating rates, specifically 2.0 °C/min, 5.0 °C/min, 10.0 °C/min, 15.0 °C/min, and 20.0 °C/min, with the target temperatures set at 100 °C, 300 °C, 500 °C, and 600 °C. The internal microstructure of thermally treated specimens was visualized using X-ray computed tomography (CT), enabling quantitative analysis of key parameters including areal porosity, volumetric porosity, fractal dimension, and crack size distribution. Results demonstrate that heating rate effects become significant above 300 °C. Between 300 °C and 600 °C, areal porosity, volumetric porosity, and fractal dimension all increase with higher heating rates, while remaining largely rate-insensitive below this temperature threshold. The fractal dimension of microdefects remains below 1.0 at temperatures under 300 °C, indicating that microdefects primarily exist as isolated pores. Above 500 °C, the fractal dimension consistently exceeds 1.0, marking a transition to a crack-dominated microstructure. Additionally, at elevated temperatures, increased heating rates promote the development of medium- and large-scale cracks while reducing the population of small-scale cracks. These findings provide crucial insights into the thermal degradation mechanisms of granite under varying thermal loading conditions.