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<p>Concrete structures are frequently exposed to high temperatures, especially during fires, which can compromise their performance. This study investigates the effects of elevated temperatures on the compressive strength, workability, and thermal stability of concrete incorporating lime and pumice powder as partial cement replacements. A total of 25 concrete mixes were prepared, varying lime (0–20%) and pumice powder (0–40%) content, while maintaining a constant water–cement ratio of 0.55. Workability was assessed immediately after mixing. Compressive strength was measured after 7, 14, and 28&#xa0;days of curing, then again after exposure to 150, 300, and 600&#xa0;°C for 2&#xa0;h, followed by a 12-h cooling period. Results indicated that 10% lime increased compressive strength, while higher lime contents reduced it. Pumice powder consistently decreased strength, with greater losses at higher dosages. All mixes experienced strength reduction at elevated temperatures, particularly at 600&#xa0;°C. Although lime and pumice offer environmental and economic advantages, their effects on high-temperature performance must be considered. A combination of 10% lime and 10% pumice powder is recommended for optimal balance.</p>

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Assessment of concrete performance with partial cement replacement using lime and pumice under elevated temperature conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月2日

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  • Tesfaye Alemu Mohammed,
  • Temesgen Ejigu Alene,
  • Bililign Firdawek

摘要

Concrete structures are frequently exposed to high temperatures, especially during fires, which can compromise their performance. This study investigates the effects of elevated temperatures on the compressive strength, workability, and thermal stability of concrete incorporating lime and pumice powder as partial cement replacements. A total of 25 concrete mixes were prepared, varying lime (0–20%) and pumice powder (0–40%) content, while maintaining a constant water–cement ratio of 0.55. Workability was assessed immediately after mixing. Compressive strength was measured after 7, 14, and 28 days of curing, then again after exposure to 150, 300, and 600 °C for 2 h, followed by a 12-h cooling period. Results indicated that 10% lime increased compressive strength, while higher lime contents reduced it. Pumice powder consistently decreased strength, with greater losses at higher dosages. All mixes experienced strength reduction at elevated temperatures, particularly at 600 °C. Although lime and pumice offer environmental and economic advantages, their effects on high-temperature performance must be considered. A combination of 10% lime and 10% pumice powder is recommended for optimal balance.