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From page 1... ... NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Responsible Senior Program Officer: Edward T Harrigan January 2015 Research Results Digest 391 INTRODUCTION Earthwork and unbound aggregates, collectively called compacted geomaterials, are a significant portion of the construction of pavements. Read the entire page →
From page 2... ... 2The construction specification should be ideally tied to a ME design algorithm. The response models in the ME algorithms can be as simple as axisymmetric linear-elastic layered models where a single modulus should be assigned to each layer or as complex as three-dimensional nonlinear finiteelement models where the modulus is defined by two to five parameters. Read the entire page →
From page 3... ... 3phase II Phase II implemented the Phase I work plan to develop the specification. It included laboratory, smallscale, and controlled field testing programs. Read the entire page →
From page 4... ... 4• Appendix D: Process for Converting Non linear Parameters from MEPDG Model to Ooi's Model • Appendix E: Impact of Moisture Variation on ModulusBased Device Measurements (Small Scale Study) • Appendix F: Evaluation of Numerical Mod els with Experimental Response of Pavement Through SmallScale Testing • Appendix G: Field Evaluation at Louisiana Transportation Research Center • Appendix H: Observations from Implementa tion of Specification -- Site I.1 • Appendix I: Observations from Implemen tation of Specification -- Site I.2 • Appendix J: Observations from Implementa tion of Specification -- Site I.3 • Appendix K: Observations from Implemen tation of Specification -- Site II.1 • Appendix L: Observations from Implementa tion of Specification -- Site II.2 sUMMaRY Of ResUlTs phase I In Phase I, the relevant worldwide engineering and soils science literature on the following topics was reviewed, analyzed, and summarized: • National and international state of practice in modulusbased quality management, • Opportunities for and obstacles to the adop tion of a modulusbased specification by the state highway agencies, • Technologies for rapidly measuring relevant field parameters for a modulusbased specifi cation, and • Relevant modulusmoisture content prediction models. Read the entire page →
From page 5... ... 5for wPI = 0 predicted the moduli better than either the MEPDG or the general Cary and Zapata model with a corresponding wPI for each material. The normalized moisture content (defined as the dif ference between the compaction moisture content and the OMC divided by the OMC) Read the entire page →
From page 6... ... 6Relationship Between Field and Laboratory Moduli. When the moisture contents were close to the com paction moisture contents in laboratory testing, the field moduli were greater than the laboratory moduli. Read the entire page →
From page 7... ... 7and field moduli. A modified version of the MEPDG nonlinear resilient modulus model was utilized to calculate the variations in modulus of each layer. Read the entire page →
From page 8... ... 8model (with PI = 0) except for tests conducted dry of the OMC. Read the entire page →
From page 9... ... 9fication is not tied to the use of any specific technology or device. State DOTs should select specific technologies and devices on the basis of their own experience and judgments of practicality, cost, precision and accuracy, ease of use, etc. Read the entire page →
From page 10... ... 10 The MEPDG uses a threetier hierarchical design approach (Level I through Level III) Read the entire page →
From page 11... ... 11 for different materials. The same compaction method should be used for preparing specimens for subsequent strength and modulus testing. Read the entire page →
From page 12... ... 12 properties (especially the parameters k1 through k3 from MR tests) Read the entire page →
From page 13... ... 13 Maximum dry density is determined by AASHTO T 99 or APPENDIX PROPOSED STANDARD SPECIFICATION FOR MODULUS-BASED QUALITY MANAGEMENT OF EARTHWORK AND UNBOUND AGGREGATES AASHTO Designation M XXX 1. SCOPE1 This specification covers the quality management of compacted geomaterials with modulusbased methods. Read the entire page →
From page 15... ... 15 6.2. The Quality Control Plan shall indicate appropriate action that shall be taken when the process is out of control. Read the entire page →
From page 16... ... 16 6.5.2. Compliance with moisture content will be documented before quality acceptance as per AASHTO T 217 or other method specified by the Engineer. Read the entire page →
From page 17... ... 17 7.7. Unless altered by the Engineer, moisture-adjusted modulus shall be evaluated for acceptance on a lot basis using the method of estimating percentage of material within specification limits (PWL) Read the entire page →
From page 18... ... Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP) Read the entire page →

From page 1...

... NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Responsible Senior Program Officer: Edward T Harrigan January 2015 Research Results Digest 391 INTRODUCTION Earthwork and unbound aggregates, collectively called compacted geomaterials, are a significant portion of the construction of pavements.