Comparing Effects of Biobinder with Other Asphalt Modifiers on Low-Temperature Characteristics of Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 3
Abstract
This paper examines effects of a new biobased modifier, “biobinder,” on low-temperature properties of asphalt binder and compares the results with those of conventional modifiers: crumb rubber, Gilsonite, styrene-butadiene-styrene (SBS), and polyphosphoric acid (PPA). Low-temperature characteristics of modified and nonmodified asphalts were studied using experimental and modeling approaches. A three-point bending beam rheometer was used to measure the stress-strain response of each specimen. A theoretical approach was used to determine stiffness and stress release rate; in addition, the Burgers model was implemented to predict the stored and dissipated energy ratio and quantity of derivation of creep compliance in each of modified and nonmodified asphalt specimens. Effects of various modifications were compared based on both the calculated stored and dissipated energy ratio and quantity of derivation of creep compliance. The proposed biobinder is produced from the thermochemical conversion of biomass (including animal waste, switch grass, and woody biomass). Biobinder is then blended with virgin binder to produce biomodified binder (BMB). This paper argues that the improved low-temperature rheological properties in biomodified binder is reflected in the enhancement in energy dissipation ratio and quantity of derivation of creep compliance.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 3 • March 2014
Pages: 429 - 439
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 9, 2012
Accepted: Apr 11, 2013
Published online: Feb 14, 2014
Published in print: Mar 1, 2014
Discussion open until: Jul 14, 2014
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