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ACKNOWLEDGMENT This work was sponsored by the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Academies. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FTA, Transit Development Corporation, or AOC endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. DISCLAIMER The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research. They are not necessarily those of the Transportation Research Board, the National Research Council, or the program sponsors. The information contained in this document was taken directly from the submission of the author(s). This material has not been edited by TRB.
ii Contents Page List of Figures ...................................................................................................................... iii List of Tables ........................................................................................................................ v 1 INTRODUCTION ............................................................................................................... 1 2 OBJECTIVE ........................................................................................................................ 1 3 SYSTEM SUPPORT AND PROGRAM INPUTS ..................................................................... 2 3.1 General Inputs .............................................................................................................. 4 3.2 Traffic Inputs ................................................................................................................. 4 3.3 Climatic Inputs .............................................................................................................. 5 3.4 Structural Inputs ........................................................................................................... 6 3.5 JMF Design Inputs ......................................................................................................... 6 3.6 Distress Criteria .......................................................................................................... 15 3.7 Executing the Program ............................................................................................... 17 3.8 Output Charts ............................................................................................................. 17 4 DISTRESS PREDICTION MODELS .................................................................................... 18 4.1 Permanent Deformation (Rutting) Model .................................................................. 18 4.1.1 Parameter Definitions ............................................................................................. 19 4.1.2 Interpolation Scheme in the NCHRP Project 9-22 Spreadsheet Solution for Rutting Prediction ......................................................................................................................... 21 4.1.3 Fitting the Database Rut Contributions of the Sublayers ........................................ 22 4.1.4 Rut Depth Prediction ............................................................................................... 23 4.2 Fatigue Cracking Model .............................................................................................. 27 4.2.1 Parameter Definitions ............................................................................................. 27 4.2.2 Development of the Fatigue Model for a Two-Layer System ................................. 28 4.2.3 Development of the Fatigue Model for a Three-Layer System ............................... 29 4.2.3 Fatigue Cracking Prediction ..................................................................................... 30 4.3 Thermal Cracking Model ............................................................................................ 31 5 USER GUIDE AND EXAMPLES ......................................................................................... 35 5.1 User Guide .................................................................................................................. 35 5.2 Example 1: Superpave Mix Design Procedure ............................................................ 36 5.3 Example 2: Marshall Mix Design Procedure ............................................................... 47 REFERENCES ..................................................................................................................... 56
iii List of Figures Page Figure 1 Program Welcome Screen .................................................................................... 3 Figure 2 Program Input Screen ........................................................................................... 3 Figure 3 Climatic Input Screen ............................................................................................ 5 Figure 4 Asphalt Material Properties Input screen ............................................................ 7 Figure 5 Mix Design Specification Input Screen ................................................................. 9 Figure 6 Specification Limits Plot ....................................................................................... 9 Figure 7 JMF Gradation Input Screen ............................................................................... 11 Figure 8 Expected Field Conditions Input Screen ............................................................. 12 Figure 9 Mix Design Window ............................................................................................ 13 Figure 10 Use of Asphalt Institute Min Vbeff Criteria - Mix Design Window ..................... 14 Figure 11 Non-Analysis Layer Mix Design Window .......................................................... 15 Figure 12 Distress Criteria input ....................................................................................... 16 Figure 13 Output Chart for Fatigue Cracking. .................................................................. 17 Figure 14 Illustration of the fitting of the rutting contribution of one sublayer .............. 23 Figure 15 Illustration of the fitting of the rutting contributions for all 37 sublayers ....... 23 Figure 16 Structure used to calculate the effective depth and loading length ................ 24 Figure 17 Structures for the interpolation scheme. ......................................................... 25 Figure 18 Structures for the interpolation scheme in a two layer structure. .................. 26 Figure 19 Comparison of Fatigue Damage between MEPDG and Developed Model (6) . 30 Figure 20 Variation of m and thermal cracking with percent air void ............................. 32 Figure 21 3D plots (a) before and (b) after smoothing .................................................... 33 Figure 22 Contour plots (a) before and (b) after smoothing ............................................ 34 Figure 23 Example 1 User Input screen ............................................................................ 38 Figure 24 Example 1 Climate selection screen ................................................................. 39 Figure 25 Example 1 Surface Layer JMF Material Properties screen ............................... 40 Figure 26 Example 1 Mix Design Specification screen ..................................................... 41 Figure 27 Example 1 Mix Design Verification screen ....................................................... 41 Figure 28 Example 1 Mix Aggregate Gradation Input screen ........................................... 42 Figure 29 Example 1 In-Situ Properties Input screen ....................................................... 43 Figure 30 Example 1 Mix Design Verification screen with Specification Range ............... 43 Figure 31 Example 1 Rut Depth Output ........................................................................... 45
iv Figure 32 Example 1 Fatigue Cracking Output ................................................................. 46 Figure 33 Example 1 Thermal Cracking Output ................................................................ 46 Figure 34 Example 2 User Input Screen ........................................................................... 49 Figure 35 Example 2 Materials Input Screen .................................................................... 50 Figure 36 Example 2 Mix Specification Selection Screen ................................................. 51 Figure 37 Example 2 Mix Verification Window Screen .................................................... 51 Figure 38 Example 2 Aggregate Gradation Input Screen ................................................. 52 Figure 39 Example 2 In-situ Properties Input Screen ....................................................... 53 Figure 40 Example 2 Mix Verification Window Screen with Specification Limits ............ 53 Figure 41 Example 2 Rut Depth Output ........................................................................... 54 Figure 42 Example 2 Fatigue Cracking Output ................................................................. 55 Figure 43 Example 2 Thermal Cracking Output ................................................................ 55
