Hydration of Concrete Containing Hybrid Recycled Demolition Powders
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 7
Abstract
If not properly managed, the hybrid powders produced during recycling mixed construction and demolition (C&D) materials will present a serious hazard to the environment and human health. Recent studies have found that a potential green way to reuse these powders is to add them as a cement replacement in concrete. In this study, the mechanisms of the concrete–clay brick hybrid recycled powder (CB-HRP) in cement hydration have been comprehensively investigated by utilizing isothermal calorimetric test, Raman spectroscopy measurement, and nanocharacterization including atomic force microscopy (AFM) and scanning electron microscopy (SEM) imaging analysis. Based on its behavior in heat generation, it is found that the CB-HRP serves as a filler material in concrete that exhibits a higher heat of wetting than normal portland cement. In the Raman identification, the spectrum of concrete containing the CB-HRP is compared with that of the benchmark samples. It is noticed that the calcium–silicate–hydrate (C─ S─ H) peak in the spectrum, which is absent in over two-thirds of the samples made of normal concrete, appears in all the samples containing the CB-HRP. In the SEM scan, the backscattered electron (BSE) technique was used to probe the distribution of different phases in concrete microstructure. Based on the contrast image, it is found that C─ S─ H phase and calcium hydroxide (CH) phase are precipitated along the boundary of the CB-HRP. This is further confirmed by the modulus profile and phase distribution obtained by the AFM characterization. The present investigation shows that the CB-HRP will promote the cement hydration by serving as a precipitation host.
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Acknowledgments
Financial support from the National Science Foundation (CMMI-1265983), the Department of Civil and Environmental Engineering and the Graduate School Diversity Research Grant for Graduate Students (CODRE) at the University of Louisville are highly appreciated. The authors also thank the Conn’s Center for Renewable Energy Research at the University of Louisville (Kentucky) for providing the Raman spectroscopy.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 16, 2016
Accepted: Oct 4, 2016
Published ahead of print: Mar 26, 2017
Published online: Mar 27, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 27, 2017
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