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

Hong Nam Thai, Ken Kawamoto, Hoang Giang Nguyen, Toshihiro Sakaki, Toshiko Komatsu and Per Moldrup
Additional contact information
Hong Nam Thai: Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
Ken Kawamoto: Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
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

Sustainability, 2022, vol. 14, issue 4, 1-22

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.

Keywords: thermal conductivity; heat capacity; construction and demolition waste (CDW); autoclaved aerated concrete (AAC); recycled aggregates; urban heat islands (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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