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Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Author

Listed:
  • Chia-Ho Wu

    (Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Chih-Hong Huang

    (Department of Architecture, National Taipei University of Technology, Taipei 10608, Taiwan
    Research Center of Energy Conservation for New Generation of Residential, Commercial and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Yeou-Fong Li

    (Research Center of Energy Conservation for New Generation of Residential, Commercial and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan
    Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Wei-Hao Lee

    (Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Ta-Wui Cheng

    (Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
    Research Center of Energy Conservation for New Generation of Residential, Commercial and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan)

Abstract

Basic oxygen furnace slag (BOFs) is difficult to reutilize because it contains excessive free lime, and thus causes serious expansion. For this reason, how to reuse BOF slag has turned out to be an imperative issue in order to meet the concept of a circular economy. The key intention of this research work is to develop a new way to reutilize BOF slag, which due to its high emissivity in the 8–13 µm wavelength range, can be used as a sustainable, passive radiative cooling material. Passive radiative cooling, without the consumption of any energy, achieves the cooling of a surface by reflecting the sunlight and radiating the heat throughout the outer space (not absorbed by the atmosphere). BOF slag is used as a radiative cooling material in geopolymeric coating. This coating possesses an emissivity of 0.95 within the range of 8–13 µm and also has high conductivity, but its gray appearance absorbs too much heat. Therefore, by improving the situation through a double-layer structure, a temperature drop of 5.9 °C was reached compared to non-coated concrete under simulated sunlight, simultaneously with a low heating rate and high cooling rate. Besides, the binding strength between the geopolymeric coating and Portland cement concrete is comparable to two commercial organic paints. It is highly probable that the utilization of BOF slag in geopolymeric coating is energy saving and also feasible for passive radiative cooling applications. Hence, it can greatly decrease indoor temperature and improve the comfort of people living in buildings.

Suggested Citation

  • Chia-Ho Wu & Chih-Hong Huang & Yeou-Fong Li & Wei-Hao Lee & Ta-Wui Cheng, 2020. "Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application," Sustainability, MDPI, vol. 12(10), pages 1-15, May.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:10:p:3967-:d:357051
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    References listed on IDEAS

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    1. Hiba Najini & Mutasim Nour & Sulaiman Al-Zuhair & Fadi Ghaith, 2020. "Techno-Economic Analysis of Green Building Codes in United Arab Emirates Based on a Case Study Office Building," Sustainability, MDPI, vol. 12(21), pages 1-22, October.
    2. Yeou-Fong Li & Po-An Yang & Chia-Ho Wu & Ta-Wui Cheng & Chih-Hong Huang, 2021. "A Study on Radiation Cooling Effect on Asphalt Concrete Pavement Using Basic Oxygen Furnace Slag to Replace Partial Aggregates," Sustainability, MDPI, vol. 13(7), pages 1-25, March.

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