Laboratory Batching Procedure Corrected for Fines and Moisture
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 2
Abstract
A key step in mix design is the selection of an appropriate aggregate structure since this affects mix performance and the amount of asphalt in the mix. This paper explores the effects that fines adhered to larger particles have on the batch gradation and the resulting optimum binder content and dust proportion. It shows that conventional batching procedures can produce gradations with a substantially larger percent passing the sieve No. 200 relative to the target gradation. A batching procedure that corrects for fines adhered to larger particles and trapped moisture is proposed and shown to replicate the target gradation. Asphalt content was determined using the superpave method for both a gradation batched conventionally and a gradation batched with the corrected procedure. It is shown that the asphalt content and volumetrics obtained in both cases are substantially different. To obtain more-representative batch gradations, the corrected procedure is recommended for routine batching of specimens. Further research is recommended to assess potential changes in mix design criteria and effects on performance tests.
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Acknowledgments
The financial support by the State of Hawaii Department of Transportation, Airports Division, Oahu District is greatly appreciated and acknowledged. The contents of this paper reflect solely the view of the authors, who are responsible for the facts and accuracy of the data presented. This study was also made possible by the collaboration of: (1) Grace Pacific LLC, (2) Jas. W. Glover, Ltd (Oahu), and (3) Asphalt Hawaii. The authors would also like to thank Miss Bonni Saust for her assistance with the laboratory work.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 19, 2015
Accepted: May 19, 2015
Published online: Jul 9, 2015
Discussion open until: Dec 9, 2015
Published in print: Feb 1, 2016
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