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Measurements and Modeling of Thermal Conductivity of Recycled Aggregates from Concrete, Clay Brick, and Their Mixtures with Autoclaved Aerated Concrete Grains

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  • Hong Nam Thai

    (Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
    Faculty of Bridges and Roads, Hanoi University of Civil Engineering, Hai Ba Trung, Hanoi 11616, Vietnam)

  • Ken Kawamoto

    (Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
    Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, Hai Ba Trung, Hanoi 11616, Vietnam)

  • Hoang Giang Nguyen

    (Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, Hai Ba Trung, Hanoi 11616, Vietnam)

  • Toshihiro Sakaki

    (Environmental Science and Engineering Consulting LLC, Nishinomiya-shi 662-0842, Japan)

  • Toshiko Komatsu

    (Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan)

  • Per Moldrup

    (Department of the Built Environment, Aalborg University, DK-9220 Aalborg, Denmark)

Abstract

Cool road pavements contribute to mitigating urban heat islands. To evaluate the heat balance in paved surfaces and to select appropriate road construction materials that help suppress heat islands, an accurate understanding of heat transport parameters such as thermal conductivity ( λ ) and heat capacity ( HC ) is important. Recycled aggregates from construction and demolition waste, including scrap construction materials and industrial by-products, are often used for road construction; however, λ and HC of recycled aggregates especially for roadbeds are not fully understood. This study involved a series of laboratory tests to measure λ and HC of recycled concrete and clay brick aggregates (<40 mm) and their mixtures with autoclaved aerated concrete grains (<2 mm) under varied moisture conditions. The measured λ and HC increased with increasing volumetric water content ( θ ). Closed-form models for estimating λ ( θ ) were proposed using normalized thermal conductivity ( λ e ) and effective saturation ( S e ). The new λ e ( S e ) models performed well for the measured data compared to previously proposed models and would be useful to evaluate λ of recycled aggregates for roadbed materials.

Suggested Citation

  • Hong Nam Thai & Ken Kawamoto & Hoang Giang Nguyen & Toshihiro Sakaki & Toshiko Komatsu & Per Moldrup, 2022. "Measurements and Modeling of Thermal Conductivity of Recycled Aggregates from Concrete, Clay Brick, and Their Mixtures with Autoclaved Aerated Concrete Grains," Sustainability, MDPI, vol. 14(4), pages 1-22, February.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:4:p:2417-:d:753846
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    References listed on IDEAS

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    1. Hoang Giang Nguyen & Dung Tien Nguyen & Ha Tan Nghiem & Viet Cuong Tran & Akira Kato & Akihiro Matsuno & Yugo Isobe & Mikio Kawasaki & Ken Kawamoto, 2021. "Current Management Condition and Waste Composition Characteristics of Construction and Demolition Waste Landfills in Hanoi of Vietnam," Sustainability, MDPI, vol. 13(18), pages 1-29, September.
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    Cited by:

    1. Laura Moretti & Giuseppe Cantisani & Marco Carpiceci & Antonio D’Andrea & Giulia Del Serrone & Paola Di Mascio & Paolo Peluso & Giuseppe Loprencipe, 2022. "Investigation of Parking Lot Pavements to Counteract Urban Heat Islands," Sustainability, MDPI, vol. 14(12), pages 1-21, June.

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