Effect of Coarse Aggregate Composition on Physical and Mechanical Properties
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 10
Abstract
Aggregates, as main components of asphalt mixtures, have a great influence on the road performance of mixtures. Similar to biological genes determining biological traits, the macroscopic performances of aggregates are determined by the aggregates’ properties. Specifically, the crushing process determines morphological characteristics of aggregates, and the chemical composition determines the physical and mechanical properties. In order to predict aggregates’ properties and rationally select aggregates, the effect of chemical composition on the properties of coarse aggregates was investigated in this paper. The physical and mechanical properties of different aggregates were tested, including the apparent relative density, water absorption, crushing value, and Los Angeles wear value. The chemical composition was measured by X-ray fluorescence (XRF). Moreover, the Pearson correlation of chemical compositions and physical and mechanical properties of coarse aggregates was analyzed by Statistic Package for Social Science (SPSS) software, and results showed that and can improve the properties of coarse aggregates, whereas CaO had a negative effect on aggregate performance. Therefore, aggregates with higher and content can be selected for pavements with high strength requirements.
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Acknowledgments
This work was supported by the Special Fund for Basic Scientific Research of Central College of Chang’an University (Nos. 300102218413, 310821153502, and 300102218405) and the Department of Science and Technology of Shaanxi Province (Nos. 2016 ZDJC-24 and 2017KCT-13).
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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: Dec 15, 2018
Accepted: Apr 29, 2019
Published online: Aug 10, 2019
Published in print: Oct 1, 2019
Discussion open until: Jan 10, 2020
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