Thickness Design of PCC/FBC Composites for Secondary/County Roads
Publication: Journal of Transportation Engineering
Volume 138, Issue 8
Abstract
Tests were conducted in the laboratory and field to determine the extent to which fluidized bed combustion (FBC) spent bed and pulverized coal combustion (PCC) fly ash, by products of the coal industry, can be used in low-volume county and secondary roads. Various proportions of prehydrated FBC spent bed (as a secondary aggregate and an agent to activate pozzolan oxides), PCC fly ash (as a primary cementitious binder), natural fine aggregate (as a primary filler), and a low dosage of Portland cement (as a secondary cementitious compound) were blended and compacted at their optimum moisture content to ascertain their suitability as base course materials. These tests and experiments were used to assess the performance of the selected PCC/FBC base course composites. On the basis of the results, thickness-design tables of PCC/FBC base courses were developed. Results indicate that the engineering properties of the PCC/FBC composites exceed those of the conventional mixes used in low-volume roads. The field results verified that the engineering characteristics of the laboratory mixtures can be easily duplicated in field.
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Acknowledgments
This research was funded by the Office of Coal Combustion Residues Management Program (CCRM) through Grant No. 6-23428 and made possible by the Illinois Department of Energy and Natural Resources (IDENR) and Illinois Clean Coal Institute (ICCI). However, any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of IDENR, ICCI or the CCRM. Thanks are extended to a number of manufacturers who contributed materials.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 138 • Issue 8 • August 2012
Pages: 998 - 1005
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Oct 7, 2010
Accepted: Jan 6, 2012
Published online: Jan 10, 2012
Published in print: Aug 1, 2012
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