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This paper presents the research results on the thermal properties, including thermal conductivity and fire resistance, of lightweight concrete using hollow microspheres from coal-fired power plant fly ash (cenospheres) as lightweight aggregates (FAC LWC). The research results indicate that using cenospheres to replace sand in varying ratios from 0 to 100% by volume can produce lightweight concrete with a density reduced from 2180 kg/m3 to 1322 kg/m3 and corresponding compressive strength of approximately 74.1 MPa to 63.3 MPa, with significantly improved thermal properties. Specifically, the thermal conductivity of the concrete decreases from 1.236 W/m·K to 0.363 W/m·K, while fire resistance, including integrity and insulation properties, is also significantly improved. FAC LWC achieves an integrity rating of EI210 to EI260 when sand is replaced with cenospheres. With this level of fire resistance, FAC LWC can be used to manufacture fire-resistant components in high-rise buildings according to the national technical regulation QCVN 06:2020/BXD on fire safety for building constructions.

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Thermo-Physical Properties of High-Strength Light-Weight Concrete Using Hollow Microsphere from Fly Ash

  • 会议论文

  • 发表日期：

    2025年

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  • Viet-Hung Le,
  • Thanh-Qui Duong,
  • Trung-Thanh Le,
  • Van-Tuan Nguyen

摘要

This paper presents the research results on the thermal properties, including thermal conductivity and fire resistance, of lightweight concrete using hollow microspheres from coal-fired power plant fly ash (cenospheres) as lightweight aggregates (FAC LWC). The research results indicate that using cenospheres to replace sand in varying ratios from 0 to 100% by volume can produce lightweight concrete with a density reduced from 2180 kg/m3 to 1322 kg/m3 and corresponding compressive strength of approximately 74.1 MPa to 63.3 MPa, with significantly improved thermal properties. Specifically, the thermal conductivity of the concrete decreases from 1.236 W/m·K to 0.363 W/m·K, while fire resistance, including integrity and insulation properties, is also significantly improved. FAC LWC achieves an integrity rating of EI210 to EI260 when sand is replaced with cenospheres. With this level of fire resistance, FAC LWC can be used to manufacture fire-resistant components in high-rise buildings according to the national technical regulation QCVN 06:2020/BXD on fire safety for building constructions.