In Situ and Laboratory Characterization of Nonlinear Pavement Layer Moduli / KP. George, W. Uddin
- Conference Author:
- Nondestructive Testing of Pavements and Backcalculation of Moduli: Second Volume (2nd : 1993 : Atlanta, GA)
- Physical Description:
- 1 online resource (15 pages) : illustrations, figures, tables
- Additional Creators:
- George, KP., Uddin, W., American Society for Testing and Materials, and ASTM International
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License restrictions may limit access. - Summary:
- The accuracy of five different backcalculation procedures for in situ characterization of granular/subgrade layers is studied by utilizing deflection data, both Dynaflect and Falling Weight Deflectometer. ELSDEF, BISDEF, MODCOMP2, MODULUS V.4 and FPEDD1/RPEDD1 are the programs evaluated with the authors' data as well as those from the literature. Included in this study is the gyratory resilient moduli of laboratory compacted samples from five sites in Mississippi. Another aspect of backcalculation procedure, lacking total consensus, is how to account for nonlinear response of granular and subgrade materials in a backcalculation algorithm. Patterned after the results of two decades of soil dynamic studies, the authors propose strain-softening models to effect correction of nonlinear behavior. The correction curve, otherwise known as shear strain attenuation curve is implemented in the FPEDD1/RPEDD1 programs. Backcalculated moduli with the FPEDD1 program show satisfactory agreement with laboratory moduli, validating the reasonableness of the strain-softening correction in light load devices. The accuracy of five different backcalculation procedures for in situ characterization of granular/subgrade layers is studied by utilizing deflection data, both Dynaflect and Falling Weight Deflectometer. ELSDEF, BISDEF, MODCOMP2, MODULUS V.4 and FPEDD1/RPEDD1 are the programs evaluated with the authors' data as well as those from the literature. Included in this study is the gyratory resilient moduli of laboratory compacted samples from five sites in Mississippi. Another aspect of backcalculation procedure, lacking total consensus, is how to account for nonlinear response of granular and subgrade materials in a backcalculation algorithm. Patterned after the results of two decades of soil dynamic studies, the authors propose strain-softening models to effect correction of nonlinear behavior. The correction curve, otherwise known as shear strain attenuation curve is implemented in the FPEDD1/RPEDD1 programs. Backcalculated moduli with the FPEDD1 program show satisfactory agreement with laboratory moduli, validating the reasonableness of the strain-softening correction in light load devices.
- Dates of Publication and/or Sequential Designation:
- Volume 1994, Issue 1198 (January 1994)
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- ISBN:
- 9780803152670 (e-ISBN)
9780803118652
0803118651 - Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 19.
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- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition. - Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1994. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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- Mode of access: World Wide Web.
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- ASTM International PDF Purchase price USD25.
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