Surface Treatment on Recycled Coarse Aggregates with Nanomaterials
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 2
Abstract
Surface treatment, using two slurries containing nanomaterials, was applied to recycled aggregate (RA). Experimental studies were conducted (1) to compare properties of RA before and after the surface treatment; and (2) to examine the modification effects of the surface treatment with nanomaterials on the microstructure and macroproperties of recycled aggregate concrete (RAC). The nanoindentation technique was used to achieve elastic modulus of different interface transition zones (ITZs) and old and new mortars in RAC. Test results show that both nanoslurries enhanced new ITZs between the old and new cement mortars. Although they did not work on old ITZs between the virgin aggregate and the old cement mortar, old mortars were surface strengthened. It is also proved that properties of both RA and RAC on the macroscale were improved by the surface treatment using nanomaterials.
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Acknowledgments
Financial support from the National Specialized Research Fund for Doctoral Program (20120101110025) and the New Century Excellent Talents in University (NCET-12-0493) are gratefully acknowledged. The authors also want to express thanks to Dr. Gajendra Shekhawat, at Northwestern University, for his support. Nanoindentation tests in this work used the NIFTI facility (NUANCE Center-Northwestern University).
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 22, 2014
Accepted: Apr 29, 2015
Published online: Jul 2, 2015
Discussion open until: Dec 2, 2015
Published in print: Feb 1, 2016
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