Journal Published Online: 13 February 2020
Volume 9, Issue 1

Investigation of the Changes in Asphalt Rubber Binder Fractions and Their Relation to Performance Enhancement

CODEN: ACEMF9

Abstract

The relation between the molecular attributes of crumb rubber–modified asphalt (CRMA) fractions and the enhancement in the CRMA in-service properties was investigated. This was achieved by investigating the relation between the enhancement of the CRMA physical properties expressed in terms of its stiffness (complex modulus [G*]) and elasticity (phase angle [δ]) and the change in its molecular structure. Gel permeation chromatography analysis on the liquid phase of CRMA fractions was employed to characterize the change in the CRMA fractions (saturates, asphaltenes, naphthene aromatics, and polar aromatics). Research results showed that, for most of the samples, there is a marked difference in the weight average molecular weight and polydispersity index in relation to enhancement of the physical properties. This indicates that the crumb rubber–modified components played a role in the change of the internal structure of the CRMA, leading to enhancement in its physical properties and thus its expected in-service performance.

Author Information

Ragab, Mohyeldin
Pure Asphalt Company, Chicago, IL, USA
Abdelrahman, Magdy
Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science & Technology, Rolla, MO, USA
Attia, Mohamed Ibrahim El-Sharkawi
Construction Engineering and Utilities Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt
Pages: 12
Price: $25.00
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Stock #: ACEM20190157
ISSN: 2379-1357
DOI: 10.1520/ACEM20190157