Engineering Physical Properties of Asphalt Binders through Nanoclay–Asphalt Interactions
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 12
Abstract
Increasing traffic volumes, heavier loads, higher tire pressures, and performance problems with asphalt concrete mixtures under adverse conditions are leading state highway departments to using modified binders to enhance the physical properties of asphalt mix. This paper reports the advantages of modified nanoclays (NC) as asphalt modifiers. Dynamic mechanical analysis, flexural creep stiffness, and flexural tests were conducted on the NC-asphalt nanocomposite. In addition, Fourier transform infrared (FTIR) testing was conducted to evaluate the nature of the interactions between NC and asphalt. Increasing NC concentration in asphalt enhances temperature susceptibility of asphalt, as well as increasing the complex modulus in addition to decreasing phase angle. FTIR experiments indicate a significant change in vibration from NC, indicating strong nonbonded interactions of tetrahedra with asphalt. These changes in vibrations suggest both distortion in tetrahedra as well as stronger interactions between asphalt and NC. Further, X-ray diffraction (XRD) testing results show intercalation of asphalt in clay galleries indicated by an enlarged -spacing of up to 43.17 Å. The -spacing decreases with NC content. These experiments suggest that the addition of engineered nanoclays to asphalt has tremendous potential in tailoring the properties of asphalt based on type of application.
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Acknowledgments
Partial support is provided by the National Science Foundation under Grant Number 0846861. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writer(s) and do not necessarily reflect the views of the National Science Foundation.
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 2, 2013
Accepted: Jan 3, 2014
Published online: Jan 6, 2014
Discussion open until: Nov 30, 2014
Published in print: Dec 1, 2014
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