Selection of Optimal Warm-Mix Additive for Recycled Crumb-Rubber Modified Asphalt Binder Based on Rheological Tests and Viscoelastic Models
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 5
Abstract
Low-carbon environmental protection and reduction of pollution have become development goals for asphalt pavement. Crumb-rubber modified asphalt binder (CRAB) made from recycled scrap tires provides an economical and practical way to salvage the natural raw materials but results in carbon and toxic emissions. Warm-mix technology has been applied to recycled CRABs, forming warm-mixed crumb-rubber asphalt binders (W-CRABs) as effective and efficient green materials to reduce energy consumption and mitigate environmental pollution. In addition, the type and dosage of warm-mix additives are key factors affecting rutting and cracking pavement distress. This study aims to correlate Superpave protocol results with those of fractional viscoelastic models to estimate the high- and low-temperature properties of W-CRABs, including recycled crumb rubber, viscosity reducer (1%, 2%, 3%), and surfactant (0.4%, 0.6%, 0.8%). Bending beam rheometer and dynamic shear rheometer tests were performed to determine experimental parameters such as complex modulus, phase angle, and the ratio of creep rate to creep stiffness (). The fractional derivative model (a connection composed of one spring, one linear dashpot, and two Abel dashpots in series) and the generalized fractional viscoelastic model (a combination of two spring-spot fractional elements in series) were developed to investigate viscoelasticity of W-CRABs. In conclusion, by experimental and modeling methods, this study recommends that, for northwest China with significant temperature differences, the optimal resistance to cracking and rutting can be achieved by mixing 0.6% surfactant and CRABs.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the support from National Natural Science Foundation Project (11762012) and Inner Mongolia Transportation Science and Technology Project (NJ-2015-1).
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© 2023 American Society of Civil Engineers.
History
Received: Jan 5, 2022
Accepted: Aug 23, 2022
Published online: Mar 1, 2023
Published in print: May 1, 2023
Discussion open until: Aug 1, 2023
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