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2.4Factors Affecting Modulus of Pavement-Subgrade
Materials 47
2.4.1 Introduction 47
2.4.2 Temperature 48
2.4.3 Stress Dependency 49
3 EQUIPMENT AND FACILITIES 55
3.1 Description of Dynaflect Test System 56
3.1.1 Description of Equipment 56
3.1.2 Calibration 59
3.1.3 Testing Procedure 59
3.1.4 Limitations 60
3.2 Description of the Falling Weight Deflectometer
Testing System 60
3.2.1 The 8002 FWD 61
3.2.2 The 8600 System Processor 61
3.2.3 The HP-85 Computer 63
3.2.4 Testing Procedure 63
3.2.5 Advantages 64
3.3 BISAR Computer Program 64
3.4 Description of Cone Penetration Test Equipment 65
3.5 Marchetti Dilatometer Test Equipment 67
3.6 Plate Bearing Test 70
4 SIMULATION AND ANALYSES OF NDT DEFLECTION DATA 71
4.1 BISAR Simulation Study 71
4.1.1 General 71
4.1.2 Dynaflect Sensor Spacing 74
4.1.3 FWD Sensor Spacing 74
4.2 Sensitivity Analysis of Theretical NDT
Deflection Basins 76
4.2.1 Parametric Study 76
4.2.2 Summary of Sensitivity Analysis 88
4.3 Development of Layer Moduli Prediction Equations. 91
4.3.1 General 91
4.3.2 Development of Dynaflect Prediction Equations.... 95
4.3.2.1 Prediction Equations for Ex 95
4.3.2.2 Prediction Equation for E£ for
Thin Pavements 103
4.3.2.3 Prediction Equations for E3 105
4.3.2.4 Prediction Equations for E^ 108
4.3.3 Development of FWD Prediction Equations 110
4.3.3.1 Prediction Equations for E1 110
4.3.3.2 Prediction Equations for E£ Ill
4.3.3.3 Prediction Equations for E3 113
4.3.3.4 Prediction Equations for E^ 114
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