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Heavy-weight concrete (HWC) is recently widely adopted as the radiation shielding material in nuclear industry. This paper proposed a new-type HWC called ultra-heavy-weight concrete (UHWC) using iron sand (IS) and steel slag coarse aggregate (SSCA) simultaneously. A total of 8 mixes were designed, which replaced river sand (RS) with 50% or 100% IS, crushed granite gravels with 50% or 100% SSCA and/or Ordinary Portland Cement (OPC) with 15%, 25% or 35% fly ash (FA) by volume. After 28-day curing, the heating test with target temperatures of 400 °C, 600 °C, 800 °C and 1000 °C was carried out. The heating curves, mass loss, surface change, residual compressive strength and elastic modulus after fire, as well as the X-ray diffraction (XRD) before and after exposure to elevated temperatures, were studied. Incorporating SSCA into UHWC significantly boosted its insulation capability, thanks to the material’s lower thermal conductivity. Besides, the residual mechanical properties of UHWC were impaired at high SSCA/IS content. In summary, the concrete mix IS50-SSCA50-FA25 exhibited better performance before and after fire (compressive strength and elastic modulus at ambient temperature of 36.2 MPa and 27.7GPa, residual strength index (RSI) after exposure to 400 °C of 0.87, residual elastic modulus index (REMI) after exposure to 400 °C of 0.76), with unit weight of 3017 kg/m3 showing the excellent radiation shielding potential.

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The Synergetic Effect of IS and SSCA on the Pre- and Post-fire Behavior of Ultra-heavy-Weight Concrete

  • 会议论文

  • 发表日期：

    2025年

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  • Zicheng Huang,
  • Qibin Gan,
  • Boxi Zhang,
  • Johnny Ching Ming Ho,
  • Mianheng Lai

摘要

Heavy-weight concrete (HWC) is recently widely adopted as the radiation shielding material in nuclear industry. This paper proposed a new-type HWC called ultra-heavy-weight concrete (UHWC) using iron sand (IS) and steel slag coarse aggregate (SSCA) simultaneously. A total of 8 mixes were designed, which replaced river sand (RS) with 50% or 100% IS, crushed granite gravels with 50% or 100% SSCA and/or Ordinary Portland Cement (OPC) with 15%, 25% or 35% fly ash (FA) by volume. After 28-day curing, the heating test with target temperatures of 400 °C, 600 °C, 800 °C and 1000 °C was carried out. The heating curves, mass loss, surface change, residual compressive strength and elastic modulus after fire, as well as the X-ray diffraction (XRD) before and after exposure to elevated temperatures, were studied. Incorporating SSCA into UHWC significantly boosted its insulation capability, thanks to the material’s lower thermal conductivity. Besides, the residual mechanical properties of UHWC were impaired at high SSCA/IS content. In summary, the concrete mix IS50-SSCA50-FA25 exhibited better performance before and after fire (compressive strength and elastic modulus at ambient temperature of 36.2 MPa and 27.7GPa, residual strength index (RSI) after exposure to 400 °C of 0.87, residual elastic modulus index (REMI) after exposure to 400 °C of 0.76), with unit weight of 3017 kg/m3 showing the excellent radiation shielding potential.