Effect of Recycled Concrete Aggregate on Rutting and Stiffness Characteristics of Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 10
Abstract
This study aims to evaluate the influence of the addition of coarse recycled concrete aggregate (CRCA) on the rutting and stiffness of Ontario Superpave mixtures. Mix designs of asphalt mixtures were performed for two types of CRCA at various proportions. To enhance the properties of CRCA, a combination of different treatment methods was investigated. The physical characteristics of treated and untreated CRCA were evaluated. The impact of treated and untreated CRCA on the rutting resistance of asphalt mixtures was determined. The obtained results indicated that the use of a combination technique of different treatment methods is a highly successful method for improving various physical properties. The addition of two types of untreated CRCA in various proportions produces higher rutting resistance and higher stiffness than the control mix. The CRCA type has an effect on the rutting characteristics of asphalt mixtures. The application of treated CRCA with heat treatment and short mechanical treatment leads to an increase in the rutting resistance, a decrease in the total rut depth, a slight increase in the stiffness, and an increase in the rutting parameter of asphalt mixtures depending on the type of CRCA. The application of treated CRCA with a presoaking method and short mechanical treatment results in an increase in the stiffness and rutting factor of mixtures depending on the type of CRCA. The results indicate that the application of different CRCA types in various forms—treated and untreated—is very successful and can contribute significantly toward more RCA applications with asphalt pavements.
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Acknowledgments
The authors gratefully acknowledge funding provided by the Ministry of Higher Education and Scientific Research/Iraq through the Iraqi Scholarship/Doctoral Program. The authors are also grateful to Steed and Evans Limited in St. Jacobs, Ontario for providing recycled concrete aggregate material and the Miller Group in Toronto, Ontario for supplying the natural aggregate and asphalt binder.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 12, 2018
Accepted: Mar 5, 2019
Published online: Jul 24, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 24, 2019
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