Laboratory Investigation of Different Standards of Phase Separation in Crumb Rubber Modified Asphalt Binders
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 12
Abstract
The phase separation between polymer additives and virgin asphalt binders during hot storage is an important issue in the asphalt industry. Traditionally, it has been customary to evaluate the degree of phase separations in polymerized asphalts by laboratory testing, such as the cigar tube test (CTB). However, the test circumstances, temperature, and storage time vary depending on different standards used in many countries. Based on a comprehensive literature review, the range of temperatures and oven storage times were selected to be 140–180°C and 2–7 days, respectively. The phase separation of 11 storage stability conditions selected from 12 different places using crumb rubber modified asphalts (CRMAs) were compared and evaluated in this study. The CRMAs produced in the laboratory were made with PG 64-22 virgin binder and ambient crumb rubber with various concentrations (10, 15, and 20% by weight of virgin binder). The CTB was used as the storage stability test method, and percent separation was obtained from the relationship between the top and bottom portion of the tube. The storage stability tests indicated that the viscosity of the CRMAs had a significant influence in the phase separation of the binders; the higher the viscosity of the binder, the less the degree of the separation.
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 12 • December 2013
Pages: 1975 - 1978
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 23, 2012
Accepted: Nov 30, 2012
Published online: Dec 3, 2012
Discussion open until: May 3, 2013
Published in print: Dec 1, 2013
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