Viscoelastic Properties of Asphalts Based on Penetration and Softening Point (eBook)

Preface 6
References 7
Contents 8
1 Viscoelastic Properties 10
Abstract 10
1.1 The Concept of Stiffness Modulus 11
1.2 The Concept of Viscoelastic Material 13
1.3 Stress-Strain Relations of Linear Viscoelasticity 16
1.4 Experimental Methods for Viscoelastic Materials 19
1.5 Time–Temperature Analogy 26
References 30
2 Determining of Asphalt Stiffness Modulus 32
Abstract 32
2.1 Test Data on Asphalt Stiffness Modulus 32
2.2 Empirical Formulas Earlier Suggested for Stiffness Modulus 35
2.3 Development of Formula for Asphalt Stiffness 38
References 47
3 Relaxation Modulus and Complex Modulus 49
Abstract 49
3.1 Asphalt Creep Compliance 50
3.2 Asphalt Relaxation Modulus 52
3.2.1 Recursive Formula for Relaxation Modulus 52
3.2.2 Approximate Formulas for Relaxation Modulus 58
3.3 Asphalt Complex Modulus 64
3.3.1 Approximate Formulas for Dynamic Modulus 65
3.3.2 Comparison of Formulas for Dynamic Modulus and Phase Angle with Test Data 67
3.3.3 Relaxation Spectrum of Asphalt Binder and Its Comparison with Test Data 70
3.4 Calculation of Relaxation Modulus Based on Complex Modulus Test Data 73
3.4.1 Calculation Method 73
3.4.2 Comparison of Moduli 77
References 79
4 Practical Applications 81
Abstract 81
4.1 Effect of Aging on Viscoelastic Properties of Asphalt 82
4.2 Requirements to Asphalt in Terms of Pavement Low-Temperature Crack Resistance 86
4.3 Asphalt Grade Defining in Accordance with Superpave Requirements 89
4.4 Determining the Asphalt and Asphalt Concrete Relaxation Modulus as a Function of Temperature and Load Duration 93
4.5 Determining of the Asphalt Concrete Complex Modulus 101
4.6 Low Temperature Cracking Problem for Asphalt Pavement 105
4.7 Conclusion 112
References 114