Long Term Pavement Performance Project Laboratory Materials Testing and Handling Guide

Protocol P46
Test Method for Resilient Modulusof Unbound Granular Base/Subbase Materials and Subgrade Soils (UG07, SS07)

“The Pro46 section of the FHWA-RD-07-052 document is now available in its entirety. Due to the increased size of this section with the inclusion of previously missing material, Pro46 has been created as a section separate from the rest of FHWA-RD-07-052. We apologize for any inconvenience.”

FormDOT F 1700.7 (8-72) Reproduction of completed page authorized

Table of Contents

• 1. SCOPE
  1. General
  2. Summary of Test Method
  3. Significance and Use
  4. Sample Storage
  5. Units
     
  
  
• 2. TESTING
  1. Testing Prerequisites
  2. Test Sample Locations and Assignment of Laboratory Test Numbers
  
  
• 3. DEFINITIONS
  
  
• 4. APPLICABLE DOCUMENTS
  1. AASHTO Standards
  2. LTPP Protocols
  3. ASTM Standards
  
  
• 5. UNBOUND MATERIALS TESTING PREREQUISITES
  1. Laboratory Testing Prerequisites for Unbound Granular Base/Subbase Materials
  2. Laboratory Testing Prerequisites for Untreated Subgrade Soils
  
  
• Chapter 6. APPARATUS
  1. Triaxial Pressure Chamber
  2. Loading Device
  3. Load and Specimen Response Measuring Equipment
  4. Specimen Preparation Equipment
  5. Thin-walled Tube Trimming Equipment
  6. Miscellaneous Apparatus
  7. System Calibration and Periodic Checks
  
  
• 7. PREPARATION OF TEST SPECIMENS
  1. GPS Materials Characterization Program - General
  2. GPS - Undisturbed Subgrade Soil Specimens
  3. GPS - Laboratory Compacted Specimens
  4. SPS Materials Characterization Program
  5. GPS and SPS - Compaction Methods and Equipment for Reconstituting Specimens
  
  
• 8. TEST PROCEDURE
  1. Resilient Modulus Test for Subgrade Soils
  2. Resilient Modulus Test for Base/Subbase Materials
  
  
• 9. CALCULATIONS
  
  
• 10. REPORT
  1. Specimen Identification
  2. Test Identification
  3. Data Reporting
  4. Comments
  
  

APPENDIX

• APPENDIX A SAMPLE PREPARATION
• APPENDIX B COMPACTION OF TYPE 1 SOILS
• APPENDIX C COMPACTION OF TYPE 2 SOILS
• APPENDIX D DETERMINATION OF APPLIED CONTACT LOAD

List of Figures

• Figure 1. Typical load and deformation versus time relationships
• Figure 2. Theoretical determination of maximum/minimum load and deformation
• Figure 3. Definition of resilient modulus terms
• Figure 4. Typical triaxial chamber with external LVDTs and load cell.
• Figure 5. Typical apparatus for vibratory compaction of Type 1 unbound materials.
• Figure 6. Typical apparatus for static compaction of Type 2 materials.
• Figure 7. Compaction of Type 2 soil, lift 1.
• Figure 8. Compaction of Type 2 soil, lift 2.
• Figure 9. Compaction of Type 2 soil, lift 3.
• Figure 10. Compaction of Type 2 soil, lift 4.
• Figure 11. Compaction of Type 2 soil, lift 5.

List of Tables

• Table 1. Testing sequence for subgrade soils
• Table 2. Testing sequence for base/subbase materials.
• Table 4. Example calculation matrix for Pcontact-mod
• Table 5. Example calculation matrix for modified Type 1 loadings

List of Worksheets

• Worksheet T46, January 2006 (Partial)
• Laboratory Data Sheet T46A - Recompacted Samples
• Laboratory Data Sheet T46A - Thinwall Tube Samples
• Laboratory Data Sheet T46 Worksheet

LIST OF ACRONYMS AND ABBREVIATIONS

Table of Contents | Back to FHWA-RD-07-052 | Next