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<p>Concrete’s heterogeneous nature influences its response to elevated temperatures; its components not only respond individually but also interactively under the effect of elevated temperatures. This study investigated the effect of elevated temperatures (200&#xa0;°C, 400&#xa0;°C, 600&#xa0;°C and 800&#xa0;°C) on concrete containing different types of coarse aggregate (limestone, granite, marble, and geopolymer artificial aggregate). Partial replacement of 50% and total replacement from the control (limestone) were investigated. Compressive strength test, XRD, TGA and SEM were obtained. The results showed that the properties of concrete were affected by the difference in the type of aggregate before and after exposure to high temperatures. The combination of 50% granite and 50% limestone aggregates showed the highest compressive strength values at temperatures of 26&#xa0;°C, 400&#xa0;°C, 600&#xa0;°C and 800&#xa0;°C, while 100% marble exhibited the highest at 200&#xa0;°C. Additionally, the geopolymer artificial aggregate displayed optimal performance and improved residual compressive strength at elevated temperatures. The findings at high temperatures align with the microstructure of ITZ and the formation of Voids due to the breakdown of calcium silicate hydrate (CSH) and a reduction in calcium hydroxide in addition to the decomposition of aggregate materials. This is further supported by XRD analysis and confirmed by TGA, which shows a decrease in mass due to the decomposition of the aggregate.</p>

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Thermal and mechanical properties of concrete containing different types of aggregates at elevated temperatures

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Amr E. Ali,
  • A. Serag Faried,
  • Khaled M. Osman

摘要

Concrete’s heterogeneous nature influences its response to elevated temperatures; its components not only respond individually but also interactively under the effect of elevated temperatures. This study investigated the effect of elevated temperatures (200 °C, 400 °C, 600 °C and 800 °C) on concrete containing different types of coarse aggregate (limestone, granite, marble, and geopolymer artificial aggregate). Partial replacement of 50% and total replacement from the control (limestone) were investigated. Compressive strength test, XRD, TGA and SEM were obtained. The results showed that the properties of concrete were affected by the difference in the type of aggregate before and after exposure to high temperatures. The combination of 50% granite and 50% limestone aggregates showed the highest compressive strength values at temperatures of 26 °C, 400 °C, 600 °C and 800 °C, while 100% marble exhibited the highest at 200 °C. Additionally, the geopolymer artificial aggregate displayed optimal performance and improved residual compressive strength at elevated temperatures. The findings at high temperatures align with the microstructure of ITZ and the formation of Voids due to the breakdown of calcium silicate hydrate (CSH) and a reduction in calcium hydroxide in addition to the decomposition of aggregate materials. This is further supported by XRD analysis and confirmed by TGA, which shows a decrease in mass due to the decomposition of the aggregate.