Postconstruction Evaluation of Subgrades Chemically Treated with Lime Kiln Dust
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 7
Abstract
An extensive field investigation was carried out to determine the properties of subgrade soils treated with lime in pavements that had been in service for at least five years. Six sites were selected for the field tests. At each site, standard penetration test (SPT), dynamic cone penetration test (DCPT), and falling weight deflectometer (FWD) tests were performed to evaluate the in situ stiffness and/or strength properties of the lime-treated subgrade. In addition, laboratory tests on soil samples taken from the SPT spoon were done to obtain index properties. The long-term performance of the subgrade was evaluated by comparing the soil indexes and stiffness and/or strength properties of the lime-treated subgrade soil with those of the natural soil. In addition, pH, X-ray diffraction (XRD), and thermogravimetric analysis (TGA) tests were conducted for both lime-treated and natural soils. The field and laboratory investigation showed that (1) the lime remains in the soil even after 11 years of service of the road; (2) the addition of lime decreases the plasticity of the soil and increases its California bearing ration (CBR); and (3) the construction quality determined from the field tests was highly variable.
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Acknowledgments
The work presented (SPR 3007) was supported by the Joint Transportation Research Program administered by the Indiana Department of Transportation and Purdue University. The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein, and do not necessarily reflect the official views or policies of the Federal Highway Administration and the Indiana Department of Transportation, nor do the contents constitute a standard, specification, or regulation. The authors are grateful to the Federal Highway Administration/Indiana Department of Transportation/Joint Transportation Research Project for supporting this research.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 7 • July 2011
Pages: 931 - 940
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 17, 2009
Accepted: Dec 17, 2010
Published online: Dec 20, 2010
Published in print: Jul 1, 2011
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