Influence of the Type of Binder and Crumb Rubber on the Creep and Recovery of Crumb Rubber Modified Bitumen
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 4
Abstract
This investigation reports the influence of the type of binder and crumb rubber gradation and dosage rate on the creep and recovery properties of crumb rubber modified bitumen (CRMB). Two types of binders, air blown and blended, were used with two gradations of crumb rubber, fine and coarse, at three dosage rates, 8, 10, and 12%. The morphology of these 12 binders were characterized by using environmental scanning electron microscopy (ESEM). Furthermore, energy dispersive X-ray spectroscopy was carried out on the samples to identify the chemical composition of the network structure as seen from ESEM. All the samples were subjected to creep and recovery tests by using a dynamic shear rheometer at five different temperatures of 46, 52, 58, 64, and 70°C. A generalized Voigt-Kelvin model was used to model the creep and recovery response of the material for all the temperatures tested. It was found that the nature of the binder plays a critical role on the development of morphology of CRMB. This morphology influences the creep and recovery characteristics of the final blend. The fibril diameter and the number of network junctions as determined through the image processing of ESEM images and the Voigt-Kelvin model parameters were found to be related.
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Acknowledgments
The authors would like to acknowledge Ms. Sonal Maheswarai, Senior Scientist, R&D, M/s Bharat Petroleum Corporation Limited for manufacturing these binders and sharing the same with us. They thank Ms. Shanthi, Material Testing Facility at the Department of Metallurgy, IIT Madras for help with the use of ESEM. The authors would like to acknowledge here the permission given by Dr. Abhijit P. Deshpande, Department of the Chemical Engineering, IIT Madras for the use of dynamic shear rheometer.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 4 • April 2013
Pages: 438 - 449
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 22, 2011
Accepted: Jun 7, 2012
Published online: Aug 25, 2012
Published in print: Apr 1, 2013
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