Thermal Conductivity of Sand–Tire Shred Mixtures
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 11
Abstract
Sand–tire shred mixtures are useful as thermal backfills due to their lower unit weight and thermal conductivity than those of most soils. In this study, a series of thermal conductivity tests on sand–tire shred mixtures and pure sand were performed to investigate the effects of volumetric mixing ratio and tire shred particle size. A volumetric mixing ratio of 40% was found to yield the greatest decrease in thermal conductivity from that of pure sand, with a maximum percentage difference of 72%. Using tire shreds with a larger relative size ratio was found to result in higher thermal conductivity, and the maximum variation in the thermal conductivity percentage difference with the relative size ratio reached about 20% at a volumetric mixing ratio of 40%. An empirical model proposed to predict of the thermal conductivity of quartz sand–tire shred mixtures captured trends in the experimental data.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The authors acknowledge the financial support from the 111 Project (Grant No. B13024), the National Science Foundation of China (Grant Nos. 51509024 and 51678094), the Fundamental Research Funds for the Central Universities (Grant No. 106112017CDJQJ208848), and the Special Financial Grant from the China Postdoctoral Science Foundation (Grant No. 2017T100681). The third author acknowledges support from the National Science Foundation (Grant No. CMMI 1230237).
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©2019 American Society of Civil Engineers.
History
Received: Jul 18, 2018
Accepted: Jun 2, 2019
Published online: Aug 20, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 20, 2020
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