Temperature predictions and adjustment factors for asphalt pavement
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2000-06-01
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Edition:Final Report
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Content Notes:CHAPTER 1. INTRODUCTION . . . . 1
BACKGROUND .. . 1
PROJECT SCOPE. . . . . . 1
REPORT ORGANIZATION. . . . . . . 1
CHAPTER 2. DATA SOURCE. . . . . . . . . . . 3
CHAPTER 3. DATA DEVELOPMENT FOR ANALYSIS .. . . 7
DATA COLLECTION .. . . . . . . 7
Temperature Data . . . . . .. . . 7
Temperature Depth Data . . .. . . 10
DATA PROCESSING FOR ANALYSIS . . .. . . 10
Thermistor Data . . .. . 11
Manual Temperatures . .. 11
Surface Temperatures . . . . . . . . . . . . .. . . 11
Creating the Data Analysis Files . . .. . . . . 11
Comparison of Resulting Temperatures . . .. . . . . . 13
Stability of the Manual Temperatures . . .. . . . . . . 14
Infrared Sensor Calibrations . .. . . . . . . 14
CHAPTER 4. TEMPERATURE PREDICTION MODELS . . . . . . . . 21
PREDICTION MODELS . . . . . . . 21
BELLS Model . . .. . . . . . . . . . . . . 21
Development of BELLS2 . . .. . . . . . . . . . 22
Shading Effect on Infrared Measurements . .. . . . . 25
BELLS2 for Production Testing . .. . . . . . . . . 26
Validation of the BELLS Models . .. . . . . . . . . 26
Recommended BELLS Models, Round 1 and Round 2 Combined .. . . 27
CHAPTER 5. TEMPERATURE ADJUSTMENTS FOR BACKCALCULATED
ASPHALT MODULI . .. . . . 29
BACKCALCULATED ASPHALT MODULI .. . . 29
Backcalculation Results . . . . . . 30
Analysis Approach .. . . . . . . 30
TEMPERATURE ADJUSTMENT OF BACKCALCULATED ASPHALT MODULI . . . . . . 37
VALIDATION OF THE TEMPERATURE ADJUSTMENT MODEL . . . . . . . . . . . . . . . . . . 38
CHAPTER 6. TEMPERATURE ADJUSTMENT FOR BASIN SHAPE FACTORS . . . . . . . . . . . . . . 43
BASIN SHAPE FACTOR DEFINITIONS . . .. . . . . . . . . 43
AREA Shape Factor . . .. . . . . . . . . . 43
F-1 Shape Factor . . . 43
Deflection Basin Delta Shape Factors . . . . . . 44
Deflection Basin Ratio Factors . . . . . 44
TEMPERATURE RELATIONSHIPS . . . . . 44
Analysis Discussion . . . . . . . . . . 44
Development of the Regression Models . . . .. . . . . . . . 45
Basin Shape Models . . . . . 47
MODEL VALIDATION . . . 49
Comparison of Round 1 and Round 2 Data .. . . . . . . . . . . . 49
TEMPERATURE ADJUSTMENTS .. . . . . . . . . . . . . . . . 51
Temperature Adjustment for Deflection Under the Load Plate .. . . . 51
Temperature Adjustments for Basin Shape Factors .. . . . . . . . . 54
CHAPTER 7. CONCLUSIONS AND RECOMMENDATIONS .. . . . . 57
CONCLUSIONS . . . .. . . . . . . . . 57
RECOMMENDATIONS . . .. . . . . . . . . . 57
Temperature Prediction With the BELLS Models . .. . . . 57
APPENDIX. DRAFT STANDARDS . . . . .. . . . . . . . . . . . . . 59
REFERENCES . .. . . . . . . . . . . . 71
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