Effect of Taconite on Healing and Thermal Characteristics of Asphalt Binder
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 12
Abstract
Based on the positive effect of metal material on the healing property of asphalt binder, this study evaluated the merits of using taconite (an iron-containing filler from iron-mine tailings) to promote the healing performance of asphalt binder. Samples of asphalt binder modified with three different dosages of taconite were tested by a thermal conductivity (TC) device. The presence of taconite can provide TC values in asphalt mastic and thereby allow inductive heating to improve healing in asphalt pavement. Laboratory experiments were used to evaluate the healing property of asphalt mastic containing 10%, 20%, or 30% by weight taconite. The healing property was measured using a healing index based on the complex modulus. The TC values were tested using a new testing method, and then the relationship between TC values and healing performance was analyzed. In the range of content of taconite used in this study, TC gradually increased with increased taconite. The results of the study showed that the presence of taconite improved the healing property of asphalt mastic. For a healing time of 900 s, a loading strain of 5%, and degree of damage of 50%, an increased dosage of taconite led to an increased healing property of modified asphalt binder, although the increase in the promoting effect on healing performance was not significant. This study also evaluated the effect of several factors that influence the healing property of asphalt mastics. The content of taconite, the healing time, the loading strain level, and the degree of damage affected the healing performance of asphalt mastics modified by taconite. Since taconite is a byproduct of mining iron-bearing sedimentary rock in which the iron minerals are interlayered with quartz, chert, or carbonate, our use of this so-called waste from mining and its application in construction is expected to promote resource conservation and recycling while enhancing sustainability in pavements.
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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
This research was funded by the China Scholarship Council (Certificate 201908500149), which also paid the author’s living expenses in the US. We also received support from the Postgraduate Research Innovation Fund Project of Chongqing Jiaotong University (2018B0103). The research was conducted also under the partial support of the 2014 Chongqing University Outstanding Achievement Transformation Funding Project (KJZH14104) and the National Science Foundation (Award No. 1928807). The authors greatly appreciate Jeff Long and Peter Goguen at Arizona State University for their assistance and guidance in connection with conducting the laboratory experiments.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 12 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 25, 2021
Accepted: Jul 8, 2021
Published online: Sep 17, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 17, 2022
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