Subgrade Resilient Modulus for Pavement Design and Evaluation : Final Report PDF
Preview Subgrade Resilient Modulus for Pavement Design and Evaluation : Final Report
SCHOOL L CIVIL ENGINEERING lfi INDIANA DEPARTMENT OF HIGHWAYS i JOINT HIGHWAY RESEARCH PROJECT FHWA/INDOT/JHRP-92-23 Final Report SUBGRADE RESILIENT MODULUS FOR : PAVEMENT DESIGN AND EVALUATION : Woqjin Lee, Nihal C. Bohra, Adolph G. Altschaeffl, and Thomas D. White o >v \L7f> PURDUE UNIVERSITY JOINT HIGHWAY RESEARCH PROJECT - FHWA/INDOT/JHRP-92-23 Final Report SUBGRADE RESILIENT MODULUS FOR PAVEMENT DESIGN AND EVALUATION Woojin Lee, Nihal C. Bohra, Adolph G. Altschaeffl, and Thomas D. White Digitized by the Internet Archive in 2011 with funding from LYRASIS members and Sloan Foundation; Indiana Department of Transportation http://www.archive.org/details/subgraderesilien9231leew Final Report SUBGRADE RESILIENT MODULUS FOR PAVEMENT DESIGN AND EVALUATION To: DDrr.. VViinncceenntt DDrraaeevviicchh August 16, 1993 Joint Highway Research Project Project: C-36-52N From: Adolph G. Altschaeffl File: 6-20-14 Attached is the Final Report of the HPR study entided "Subgrade Resilient Modulus for Pavement Design and Evaluation", prepared by Woojin Lee, N. Bohra, A. G. Altschaeffl, and T. D. White. This reportouUines a set ofprocedures and testresults on subgrade soils in Indiana to enable INDOT engineers to evaluate resilient modulus values for use in the design of pavements. A fully automated testing method has been developed to determine resilient modulus values in the laboratory according to AASHTO T 274-82. Results are reported for both the laboratory and the field compacted samples. The effect of environmental factors on resilient modulus—freeze-thaw andpost-compactionmoisturechanges—hasbeenconsideredby simulating these conditions in the laboratory. Freeze-thaw cycles were simulated in a freeze-thaw chamber. An injection technique has been developed to achieve moderate increase in the post-compaction water content. Fabric studies were performed to explain the resilient response of the soil investigated. Correlations were developed between the fabric parameters, clay content, and maximum attainabledry unit weight. A nonparametric statistical study was carried out—based on a previous study on a silty clay (CL, A-6 soil)—to identify laboratory compaction procedure capable of replicating the field compacted fabric. Fabrics ofthe laboratory and field compacted soils—both compacted and uncompacted (powdered) samples—were determined using mercury intrusion porosimetry. Resilient response is correlated with the fabric parameters, pore water, and clay content. Respectfully submitted. A. G. Altschaeffl Research Engineer cc: A. G. Altschaeffl W. L. Dolch C. W. Lovell G. Shoener L. Bandy V. P. Draevich D. W. Lucas K. C. Sinha M. Byers A. R. Fendrick B. Mason D. L. Tolbert P. L. Bourdeau J. D. Fricker B. G. McCullouch L. Tucker M. D. Bowman K. R. Hoover B. K. Partridge R. VanCleave M. J. Cassidy R. B. Jacko F. P'Pool T. D. White L. M. Chang L. S. Jones J. A. Ramirez L. E. Wood E. Cox C. V. Kahl G. F. Rorbakken J. R. Wright S. Diamond R. H. Lee C. F. Scholer Final Report SUBGRADE RESILIENT MODULUS FOR PAVEMENT DESIGN AND EVALUATION by Woojin Lee, Nihal C. Bohra, Adolph G. Altschaeffl, and Thomas D. White Joint Highway Research Project Project No.: C-36-52N File No.: 6-20-14 Prepared for an Investigation Conducted by the Joint Highway Research Project Engineering Experiment Station Purdue University in cooperation with the Indiana Department of Transportation and the U. S. Department of Transportation Federal Highway Administration The contents of this report reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Purdue University West Lafayette, Indiana 47907 August 16, 1993 TECHNICALREPORT STANDARDTITLEPAGE 1. ReportNo. 2. GovernmentAccessionNo. 3. Recipient'sCatalogNo. FHWA/LNDOT/JHRP-92-23 4. TitleandSubtitle 5. ReportDate August 16, 1993 Subgrade Resilient Modulus for Pavement Design and Evaluation 6. PerformingOrganizationCode 7. Auihor(s) 8. PerformingOrganizationReportNo. Woojin Lee, N.C. Bohra, FHWA/LNDOT/JHRP-92-23 A.G. Altschaeffl, and T.D. White 9. PerformingOrganizationNameand Address 10. Work UnitNo. Joint Highway Research Project Civil Engineering Building 11. ContractorGrant No. Purdue University West Lafayette, LN 47907 13.TypeofReportand PeriodCovered 12. SponsoringAgency Nameand Address Indiana Department of Transportation Final Report State Office Building 100 North Senate Avenue 14. SponsoringAgencyCode Indianapolis, IN 46204 15. SupplementaryNotes 16. Abstract The main goal of this study was to develop a set of testing procedure for resilient modulus and to provide a set of resilient modulus data on typical Indiana soils. Soils tested were five cohesive soils and one granular soil. Resilient modulus tests were performed in the laboratory on a fully automated repeated-load triaxial equipment according to AASHTO T 274-82. A set of correlations was developed between the resilient modulus and the unconfined compression test results for normal and thawed subgrade conditions, based on the test results on the specimen sampled from existing subgrades. Freeze-thaw and post compaction water content increase effects were simulated in the laboratory by using a freeze-thaw chamber and an injection technique respectively. The resilient modulus for frozen subgrade was also determined. A nonparametric statistical technique was applied to identify a laboratory compaction method capable of replicating the field compacted fabric. Fabric studies on the soils investigated were performed using a mercury intrusion porosimeter. Deformability and resilient response were explained by the fabric of compacted and uncompacted (powdered) soils. A simplified design procedure was developed and it can be incorporated into 1986 AASHTO Guide for Design of Pavement Structures. Developed correlation for normal subgrade condition will help field engineers control the resilient properties of subgrade during construction. Also provided is the procedure to determine the resilient modulus at specific levels of stresses using the design charts developed. 17. KeyWords 18. DistributionStatement No restrictions. This document is available Resilient Modulus, pavement design, to the public through the subgrade, soil fabric National Technical Information Service, Springfield, Virginia 22161 19. Security Classif. (ofthis report) 20. SecurityClassif. (ofthispage) 21. No. ofPages 22. Price Unclassified Unclassified 349 Form DOT F 1700.7 (8-69)
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