Impact of Fine Materials Content on the Transport of Dust Suppressants in Gravel Road Wearing Courses
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 8
Abstract
A significant problem when dust-suppressing agents are used on gravel roads is that they tend to leach during rainfall. The purpose of this study is to illustrate this problem by using laboratory studies and studies in situ. Both capillary rise and leaching of suppressants were examined by using cylinders filled with wearing course material. Chloride was more prone than lignosulphonate to transport upwards by means of capillary rise, and therefore, it showed a more effective performance over a longer period of time. Optimal percentages of fine material for minimal lignosulphonate and chloride leaching were found to be 15% by weight and 10–15% by weight, respectively. Ions of calcium chloride seemed to flocculate clay particles, which probably prevents them from leaching. To study the in situ longevity of fine material in general, calcium carbonate, mesa, was used as a marker. The fine material in gravel wearing courses must be replenished regularly. Mesa loss was up to 80% after 1 year.
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Acknowledgments
The Swedish Road Administration (SRA), through the Centre for Research and Education in Operation and Maintenance of Infrastructure (CDU) and the research centre Road Technology (RT), provided funding for this project. These organizations are gratefully acknowledged, as is the dust control team at Svevia, who dust suppressed the test gravel road sections and added the mesa. The authors would also like to express their deepest gratitude to Professor Michael Olsson, at Dalarna University, for valuable support and recommendations while using the SEM.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 8 • August 2011
Pages: 1163 - 1170
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 13, 2010
Accepted: Jan 25, 2011
Published online: Jan 28, 2011
Published in print: Aug 1, 2011
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