Development of Electrically Conductive Cold Weather Cement Concrete
Publication: Journal of Cold Regions Engineering
Volume 37, Issue 1
Abstract
Placing fresh cement concrete is not permitted during cold weather under normal conditions due to the risk of frost damage. On the other hand, electrically conductive concrete can be used for deicing/snow-melting applications. This paper presents laboratory investigations to develop electrically conductive cold weather concrete (ECCWC) that can be cast and cured below freezing temperatures and has sufficient electrical conductivity for Joule heating. The concrete has additive-based freeze protection (ABFP) systems that consist of optimized amounts of accelerators and corrosion-inhibiting admixtures. Several mixture proportions were made with 0.5%, 0.75%, and 1.0% carbon fibers by volume of concrete to increase the concrete’s conductivity. ECCWC specimens were mixed, cast, and cured at −5°C. The measured freezing points of fresh concrete mixtures were below −5°C. The compressive strength development of ECCWC cured at −5°C was slow compared with the strength development of conductive concrete cured at 20°C. However, ECCWC could reach 55 MPa at 28 days of age. The temperature of hardened ECCWC increased by 18.5°C within 20 min when subjected to a potential difference of 30 V (alternating current). ABFP implemented in the ECCWC mixtures reduces the risk of frost damage and provides the opportunity to place fresh conductive cold weather concrete at ambient temperatures of −5°C without the need for taking curing precautions. The developed ECCWC introduces a new method for constructing multifunctional concrete structures to be placed and cured in cold regions.
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Acknowledgments
The use of trade, product, or firm names in this document is for descriptive purposes only and does not imply endorsement by the US government. The tests described and the resulting data presented herein, unless otherwise noted, are based upon work supported by the US Army ERDC under Contract No. W913E518C0008P00001. Permission was granted by the Director, Cold Regions Research and Engineering Laboratory to publish this information. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.
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© 2022 American Society of Civil Engineers.
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Received: Apr 9, 2022
Accepted: Oct 14, 2022
Published online: Dec 13, 2022
Published in print: Mar 1, 2023
Discussion open until: May 13, 2023
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