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New Approach for Selecting Crumb-Rubber-Modified Asphalts for Rutting and Permanent Deformation Resistance
Advances in Civil Engineering Materials
  • Mohyeldin Ragab
  • Magdy Abdelrahman, Missouri University of Science and Technology
  • Amir Ghavibzaoo
Abstract

In the current research, the introduction of a new selecti on approach for crumb-rubber-modified asphalts (CRMA), based on their rutting and permanent deformation resistance, is carried out. This new approach involves selecting CRMA according to their rheological properties [complex modulus (G*) and phase angle (δ) values] by utilizing a proposed three-dimensional (3D) parametric diagrams approach. This was carried out for the different asphalt and crumb-rubber (CR) types investigated. Three-dimensional parametric diagrams for both the G* and δ were constructed through controlling the interaction time, speed, and temperature for the CRMA synthesis. This was carried out to illustrate the combined effect of interaction speed and temperature, with the increase of interaction time, on the produced rutting and permanent deformation resistance properties of CRMA. It was found that, for all the asphalt types investigated, the utilization of a high interaction mixing speed of 50 Hz with a medium interaction temperature (190°C) for the mixing of cryogenic processed CR with asphalt produced the best results in terms of complex modulus (G*) and phase angle (δ) values. For ambient processed CR, on the other hand, the utilization of a low interaction temperature (160°C), with both interaction speeds utilized (10 and 30 Hz), produced enhanced properties (G* and δ) for the CRMA. Based on the results obtained in this research, the new selection approach presents an efficient way to provide an expected profile for the asphalt in-service required properties with relation to their synthesis conditions.

Department(s)
Civil, Architectural and Environmental Engineering
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2013 ASTM International, All rights reserved.
Publication Date
6-1-2013
Publication Date
01 Jun 2013
Disciplines
Citation Information
Mohyeldin Ragab, Magdy Abdelrahman and Amir Ghavibzaoo. "New Approach for Selecting Crumb-Rubber-Modified Asphalts for Rutting and Permanent Deformation Resistance" Advances in Civil Engineering Materials Vol. 2 Iss. 1 (2013) p. 360 - 378 ISSN: 2165-3984
Available at: http://works.bepress.com/magdy-abdelrahman/63/