Inorganic Nanoparticle-Modified Asphalt with Enhanced Performance at High Temperature
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 3
Abstract
Seven types of inorganic nanoparticles were selected to modify the base asphalt used in asphalt concrete pavement. The most suitable one, silicon dioxide (), was screened out based on its excellence in improving asphalt pavement performance. nanoparticles as a modifier, along with silane coupling agent, stearic acid, and polyethylenimine as the respective dispersants, were prepared at different levels to manufacture various nanoparticle-modified asphalt, from which the level of nanoparticle–modified 5% silane coupling agent was selected because of its outstanding performance. This nanoparticle-modified asphalt was then subjected to dynamic shear rheometer (DSR) tests and bending beam rheometer (BBR) tests to evaluate its performance when used in pavement, and scanning electron microscopy (SEM) tests, Fourier transform infrared (FTIR) spectroscopy tests, gel permeation chromatography (GPC) tests, and differential scanning calorimetry (DSC) tests to analyze the microscopic mechanism of nanoparticles in asphalt modification. It was found that nanoparticles can significantly improve asphalt performance at high temperatures. It was also evident from the frequency sweep test that the effect of nanoparticles on the complex viscosity weakens gradually as the frequency increases, indicating that nanoparticles improve asphalt performance more significantly at low-frequency conditions than at high-frequency conditions. Laboratory test results of pavement performance of asphalt concrete mixture show that nanoparticles also considerably improve high-temperature stability and water stability of base-asphalt concrete mixture.
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Acknowledgments
This study is sponsored by Shanghai PPD Transportation Science & Technology Limited and in part by the National Natural Science Foundation of China under grants U1134206 and by the Natural Science Foundation of Jiangsu Province under grants SBK200910046, to which the authors are very grateful.
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© 2016 American Society of Civil Engineers.
History
Received: Nov 18, 2015
Accepted: Jul 11, 2016
Published online: Sep 23, 2016
Discussion open until: Feb 23, 2017
Published in print: Mar 1, 2017
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