Use of Atomic Force Microscopy for Evaluation of the Adhesion Mechanism of Bituminous Binder Modified with Nano Hydrated Lime
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 10
Abstract
The durability of flexible pavements is affected by the presence of moisture, which leads to failure of bitumen-aggregate bonds. The failure of the bond has been explained by various mechanisms. The use of hydrated lime (HL) has been found to improve this bond and reduce moisture damage. However, a unique mechanism leading to the improvement in the bond requires further research and has motivated the introduction of nanotechnology in its determination. The present study is based on the use of synthesized NHL in varying percentages to modify bituminous binder. Atomic force microscopy (AFM) was carried out on the base and modified binders to evaluate bond strength and bond length of the modified bituminous binder, and unique observations were made. The peak force corresponding to bond strength is found to increase up to 10% with the addition of NHL, after which saturation is observed. The distance corresponding to this peak force, however, keeps on increasing with incremental usage of NHL. This observation was attributed to an increase in charge density due to addition of inorganic NHL.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including data for preparing AFM graphs.
Acknowledgments
The authors are grateful to the Sophisticated Training and Instrumentation Facility (STIC), Cochin, India for providing the TEM images, as well as to the Micro and Nano Characterization Facility (MNCF), Centre for Nano Science and Engineering (CeNSE), Indian Institute of Science, Bangalore, India for carrying out the AFM.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 10 • October 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Dec 3, 2019
Accepted: Mar 17, 2020
Published online: Jul 21, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 21, 2020
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