Research on the Modulus Decay Model under a Three-Dimensional Stress State of Asphalt Mixture during Fatigue Damage
Abstract
:1. Introduction
1.1. Background
1.2. Objective
- (1)
- The relationship between the asphalt mixtures’ strength and loading rate was established.
- (2)
- The conventional S-N fatigue equations for asphalt mixtures under the DT, IDT, and UC modes were obtained and analyzed. Additionally, the normalized fatigue equation for asphalt mixtures under the various modes was established based on the fatigue stress strength ratio Δ.
- (3)
- Through stress-controlled fatigue tests, the modulus decay equations of asphalt mixtures under the DT, IDT, and UC modes were developed and compared.
- (4)
- A unified characterization model for the modulus decay of asphalt mixture under the 3-D stress state was established based on the fatigue stress strength ratio Δ.
2. Materials and Methodology
2.1. Materials
2.1.1. Asphalt
2.1.2. Aggregate and Filler
2.1.3. Mix Design
2.2. Experiment Approach
2.2.1. Specimen Preparation
2.2.2. Strength Test Approach
2.2.3. Fatigue Test Approach
2.3. Derivation of Modulus Decay Equation
2.3.1. Damage Variables Based on Modulus
2.3.2. Nonlinear Fatigue Damage Equation for Asphalt Mixes
2.3.3. Modulus Decay Equation
3. Results and Discussion
3.1. Asphalt Mixture Strength and Fatigue Test Results Analysis
3.1.1. Analysis of Strength Test Results
3.1.2. Analysis of Fatigue Test Results
3.2. The Modulus Decay Law of Asphalt Mix with Various Stress States
3.2.1. Fitting Results of Modulus Decay Equation with Various Stress States
3.2.2. Comparative Analysis of Modulus Decay Law under Different Stress States
3.3. Unified Characterization Model for Modulus Decay of Asphalt Mixture under the 3-D Stress State
3.3.1. Fatigue Stress Strength Ratio and Normalized Fatigue Equation
3.3.2. Establishment of the Modulus Decay Model under the 3-D Stress State
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Test Items | Test Results | Indicator Requirements | Specifications | |
---|---|---|---|---|
Penetration 25 °C, 100 g, 5 s (0.1 mm) | 62 | 60~80 | T 0604-2011 | |
Ductility 5 cm/min, 5 °C (cm) | 16 | ≥15 | T 0605-2011 | |
Softening point (°C) | 72.5 | ≥55 | T 0606-2011 | |
Dynamic viscosity 180 °C (Pa·s) | 2.8 | 1~4 | T 0625-2011 | |
Elastic recovery 25 °C (%) | 84 | ≥55 | T 0662-2000 | |
48 h softening point difference (°C) | 2.0 | ≤5.5 | T 0661-2011 | |
Residue after TFOT (163 °C, 85 min) | Mass loss (%) | −0.29 | ≤±0.8 | T 0610-2011 |
Residual penetration ratio 25 °C (%) | 77 | ≥60 | T 0604-2011 | |
Residual ductility 5 °C (cm) | 11 | ≥10 | T 0605-2011 |
Particle Size (mm) | Apparent Relative Density (g/cm3) | Gross Volume Relative Density (g/cm3) | Water Absorption (%) |
---|---|---|---|
13.2~9.5 | 2.692 | 2.619 | 0.42 |
9.5~4.75 | 2.686 | 2.562 | 0.46 |
4.75~2.36 | 2.655 | 2.554 | 1.06 |
2.36~1.18 | 2.632 | 2.612 | 1.29 |
1.18~0.6 | 2.625 | 2.607 | 1.31 |
0.6~0.3 | 2.618 | 2.596 | 1.34 |
0.3~0.15 | 2.602 | 2.588 | 1.53 |
0.15~0.075 | 2.618 | 2.605 | 1.58 |
Test Items | Crushing Value (%) | Polishing Value (BPN) | Abrasion Value (%) |
---|---|---|---|
Results | 15.8 | 57.4 | 19.9 |
Technical indicators | ≤28 | ≥45 | ≤30 |
Test Items | Test Results | Technical Indicators | |
---|---|---|---|
Apparent relative density (g/cm3) | 2.688 | ≥2.50 | |
Water content (%) | 0.4 | ≤1 | |
Apparent property | No agglomeration | — | |
Hydrophilic coefficient | 0.57 | <1 | |
Plasticity index (%) | 2.2 | <4 | |
Particle size (%) | <0.6 mm | 100 | 100 |
<0.15 mm | 95.2 | 90~100 | |
<0.075 mm | 84.4 | 75~100 |
Asphalt–Aggregate Ratio (%) | Bulk Density (g/cm3) | Volume of Air Voids VV (%) | Voids in Mineral Aggregate VMA (%) | Voids Filled with Asphalt VFA (%) | Marshall Stability MS (kN) | Flow Value FL (mm) | Dynamic Stability DS (time/mm) |
---|---|---|---|---|---|---|---|
5.5 | 2.512 | 3.91 | 13.89 | 71.78 | 12.71 | 3.9 | 9581 |
Loading Modes | Displacement-Controlled Strength (MPa) | Mean Strength (MPa) | Coefficient of Variation (%) |
---|---|---|---|
DT | 1.043/1.138/1.032 | 1.071 | 5.442 |
IDT | 2.192/2.064/2.284 | 2.180 | 5.068 |
UC | 7.732/7.029/7.583 | 7.448 | 4.974 |
Loading Rate (MPa/s) | DT | IDT | UC | |||
---|---|---|---|---|---|---|
Mean Strength (MPa) | Coefficient of Variation (%) | Mean Strength (MPa) | Coefficient of Variation (%) | Mean Strength (MPa) | Coefficient of Variation (%) | |
0.02 | 0.928 | 6.819 | 0.931 | 4.988 | 6.525 | 9.982 |
0.05 | 1.162 | 7.066 | 1.132 | 8.896 | 7.036 | 5.849 |
0.1 | 1.537 | 4.988 | 1.185 | 7.494 | 8.315 | 5.430 |
0.5 | 1.987 | 5.125 | 1.859 | 9.116 | 10.303 | 4.566 |
1.0 | 2.155 | 5.882 | 2.113 | 5.100 | 12.348 | 5.670 |
2.0 | 2.439 | 6.534 | 2.214 | 9.853 | 12.712 | 5.225 |
4.0 | 3.319 | 7.115 | 2.358 | 7.303 | 14.594 | 8.024 |
6.0 | 3.407 | 8.310 | 2.915 | 5.585 | 14.978 | 5.837 |
DT | IDT | UC | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
CV | CV | CV | |||||||||
0.2 | 0.187 | 934,042 | 10.350 | 0.2 | 0.092 | 699,521 | 9.137 | 1.5 | 0.134 | 722,354 | 12.562 |
0.4 | 0.373 | 61,249 | 16.107 | 0.4 | 0.183 | 21,498 | 13.737 | 2.0 | 0.201 | 280,096 | 15.050 |
0.6 | 0.560 | 19,905 | 15.983 | 0.6 | 0.275 | 5115 | 8.491 | 2.5 | 0.269 | 41,052 | 8.834 |
0.8 | 0.747 | 7889 | 21.118 | 0.8 | 0.367 | 1205 | 14.842 | 3.0 | 0.336 | 11,884 | 11.396 |
1.0 | 0.934 | 3503 | 13.354 | 1.0 | 0.459 | 519 | 11.666 | 3.5 | 0.403 | 6268 | 9.785 |
Stress Levels (MPa) | Nominal Stress Ratio | Value | Mean of Values | Coefficient of Variation (%) |
---|---|---|---|---|
0.2 | 0.187 | 0.418/0.389/0.395/0.456 | 0.415 | 7.345 |
0.4 | 0.373 | 0.499/0.443/0.524/0.501 | 0.492 | 6.997 |
0.6 | 0.560 | 0.574/0.527/0.541/0.634 | 0.569 | 8.354 |
0.8 | 0.747 | 0.598/0.568/0.563/0.607 | 0.584 | 3.752 |
1.0 | 0.934 | 0.655/0.617/0.621/0.673 | 0.642 | 4.226 |
Stress Levels (MPa) | Nominal Stress Ratio | Value | Mean of Values | Coefficient of Variation (%) |
---|---|---|---|---|
0.2 | 0.092 | 0.446/0.432/0.488/0.431 | 0.449 | 5.960 |
0.4 | 0.183 | 0.575/0.524/0.548/0.625 | 0.568 | 7.606 |
0.6 | 0.275 | 0.602/0.615/0.641/0.553 | 0.603 | 6.097 |
0.8 | 0.367 | 0.626/0.593/0.577/0.668 | 0.616 | 6.551 |
1.0 | 0.459 | 0.669/0.636/0.659/0.696 | 0.665 | 3.726 |
Stress Levels (MPa) | Nominal Stress Ratio | Value | Mean of Values | Coefficient of Variation (%) |
---|---|---|---|---|
1.5 | 0.134 | 0.397/0.436/0.395/0.389 | 0.404 | 5.281 |
2.0 | 0.201 | 0.423/0.415/0.436/0.438 | 0.428 | 2.547 |
2.5 | 0.269 | 0.465/0.431/0.446/0.522 | 0.466 | 8.550 |
3.0 | 0.336 | 0.495/0.488/0.521/0.514 | 0.504 | 3.093 |
3.5 | 0.403 | 0.509/0.547/0.486/0.520 | 0.516 | 4.916 |
Loading Modes | Stress Levels (MPa) | ||||
---|---|---|---|---|---|
DT | 0 | 0 | |||
IDT | 0 | ||||
UC | 0 | 0 |
Loading Modes | Stress-Controlled | ||||
---|---|---|---|---|---|
DT | 0 | 0 | |||
IDT | 0 | ||||
UC | 0 | 0 |
Loading Modes | Stress Level (Mpa) | Loading Rate (MPa/s) | Ultimate Strength (Mpa) | Δ | ||
---|---|---|---|---|---|---|
DT | 0.2 | 4 | 3.056 | 0.2 | 3.056 | 0.065 |
0.4 | 8 | 3.543 | 0.4 | 3.543 | 0.113 | |
0.6 | 12 | 3.862 | 0.6 | 3.862 | 0.155 | |
0.8 | 16 | 4.106 | 0.8 | 4.106 | 0.195 | |
1 | 20 | 4.306 | 1 | 4.306 | 0.232 | |
IDT | 0.2 | 4 | 2.613 | 0.721 | 9.421 | 0.077 |
0.4 | 8 | 2.991 | 1.442 | 10.784 | 0.134 | |
0.6 | 12 | 3.237 | 2.163 | 11.672 | 0.185 | |
0.8 | 16 | 3.424 | 2.884 | 12.345 | 0.234 | |
1 | 20 | 3.576 | 3.606 | 12.894 | 0.280 | |
UC | 1.5 | 30 | 19.589 | 1.5 | 19.589 | 0.077 |
2 | 40 | 20.476 | 2 | 20.476 | 0.098 | |
2.5 | 50 | 21.192 | 2.5 | 21.192 | 0.118 | |
3 | 60 | 21.796 | 3 | 21.796 | 0.138 | |
3.5 | 70 | 22.319 | 3.5 | 22.319 | 0.157 |
Loading Modes | Stress Level (Mpa) | Fatigue Stress Strength Ratio Δ | Modulus Decay Equation Parameter |
---|---|---|---|
DT | 0.2 | 0.065 | 0.415 |
0.4 | 0.113 | 0.492 | |
0.6 | 0.155 | 0.569 | |
0.8 | 0.195 | 0.584 | |
1 | 0.232 | 0.642 | |
IDT | 0.2 | 0.077 | 0.449 |
0.4 | 0.134 | 0.568 | |
0.6 | 0.185 | 0.603 | |
0.8 | 0.234 | 0.616 | |
1 | 0.280 | 0.665 | |
UC | 1.5 | 0.077 | 0.404 |
2 | 0.098 | 0.428 | |
2.5 | 0.118 | 0.466 | |
3 | 0.138 | 0.504 | |
3.5 | 0.157 | 0.516 |
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He, Y.; Lv, S.; Wang, Z.; Ma, H.; Lei, W.; Pu, C.; Meng, H.; Xie, N.; Peng, X. Research on the Modulus Decay Model under a Three-Dimensional Stress State of Asphalt Mixture during Fatigue Damage. Buildings 2023, 13, 2570. https://doi.org/10.3390/buildings13102570
He Y, Lv S, Wang Z, Ma H, Lei W, Pu C, Meng H, Xie N, Peng X. Research on the Modulus Decay Model under a Three-Dimensional Stress State of Asphalt Mixture during Fatigue Damage. Buildings. 2023; 13(10):2570. https://doi.org/10.3390/buildings13102570
Chicago/Turabian StyleHe, Yonghai, Songtao Lv, Ziyang Wang, Huabao Ma, Wei Lei, Changyu Pu, Huilin Meng, Nasi Xie, and Xinghai Peng. 2023. "Research on the Modulus Decay Model under a Three-Dimensional Stress State of Asphalt Mixture during Fatigue Damage" Buildings 13, no. 10: 2570. https://doi.org/10.3390/buildings13102570