Effects of Modern Concrete Materials on Thermal Conductivity
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 4
Abstract
Thermal conductivity, , is one of the key factors that control heat transfer in concrete. This paper presents the results of an experimental study conducted to analyze the effects of modern concrete materials, such as supplementary cementitious materials (SCMs), normal-weight, lightweight, and recycled aggregates, and steel and polypropylene (PP) fibers, on the thermal conductivity of concrete. The thermal conductivity tests were performed on cylindrical specimens of concrete mixes containing various amounts of these materials. The results indicate that values of concrete reduced with the amount of SCM (slag and fly ash) replacement for cement. The mineralogy and absorption of normal weight aggregate considerably affect value of concrete. Replacing normal weight coarse aggregate by lightweight or recycled aggregate reduced the value of concrete. Addition of steel fiber at a dosage higher than 0.25% (by volume) increased value of concrete noticeably, whereas the addition of up to 2% PP fiber showed little effect.
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Acknowledgments
The present study is a part of a research project “Evaluate, Modify, and Adapt the ConcreteWorks Software for Iowa’s Use,” sponsored by the Iowa Highway Research Board (IHRB). The authors acknowledge the sponsorship.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 10, 2019
Accepted: Jul 15, 2019
Published online: Feb 6, 2020
Published in print: Apr 1, 2020
Discussion open until: Jul 6, 2020
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