Study on Thixotropy of Mastic Asphalt Binder and Asphalt Mastic
Abstract
:1. Introduction
2. Methods
3. Experimental Plan
3.1. Test Equipment
3.2. Materials
3.3. Preparation of Mastic Asphalt Binder and Asphalt Mastic
3.3.1. Preparation of Mastic Asphalt Binder Samples
3.3.2. Preparation of Asphalt Mastic Samples
4. Thixotropic Constitutive Model of Mastic Asphalt Binder
4.1. Constitutive Model
4.2. Establishment of Constitutive Model
5. Thixotropic Constitutive Model of Asphalt Mastic
6. Influencing Factors of Thixotropy of Mastic Asphalt Binder
6.1. Influence of Asphalt Types on Thixotropy
6.2. Effect of Asphalt–Aggregate Ratio on Thixotropy
6.3. Effect of Filler Type on Thixotropy
6.4. Effect of Temperature on Thixotropy
6.5. Effect of Shear Rate on Thixotropy
7. Conclusions
- (1)
- The greater the amount of lake asphalt, the greater the thixotropy of mastic asphalt binder and asphalt mastic; The greater the asphalt–aggregate ratio, the greater the thixotropy of asphalt mastic; The thixotropy of asphalt mastic with cement as filler is much greater than that of asphalt mastic with mineral powder as filler; The higher the temperature and the higher the shear rate, the smaller the thixotropy of mastic asphalt binder, and they are equivalent;
- (2)
- The initial viscosity and steady-state viscosity of mastic asphalt binder and asphalt mastic decrease with the increase of shear rate, and the time for the system to reach steady-state viscosity shortens with the increase of shear rate. Therefore, when it is necessary to shorten the stirring time of mastic asphalt concrete, the shear rate can be increased;
- (3)
- Increasing the shear temperature does not change the time parameter of reaching steady-state viscosity obviously. When the mixing time is sufficient, the viscosity index of finished mastic asphalt concrete should be considered in the selection of mixing temperature;
- (4)
- When the amount of lake asphalt or cement in the asphalt mastic is increased, the viscosity of asphalt mastic and the mixing time to reach the steady viscosity increase; that is, the mixing time needs to be increased.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Pilot Item | Unit | Mastic Asphalt Binder | A-70 | TLA | |
---|---|---|---|---|---|
Penetration (25 °C, 100 g, 5 s) | 0.1 mm | 16 | 63 | 3 | |
Penetration index PI | - | −0.68 | |||
Softening point | °C | 69 | 50 | 90 | |
Ductility (15 °C, 5 cm/min) | cm | >100 | |||
Ductility (10 °C, 5 cm/min) | cm | 34.6 | |||
Density 15 °C | g/cm | 1.031 | 1.261 | ||
Solubility (trichloroethylene) | % | 68.1 | 99.9 | 52.5 | |
Flash point | °C | 268 | 309 | ||
Wax content (distillation method) | % | 1.72 | |||
Viscosity 60 °C | Pa·s | 340 | |||
Kinematic viscosity 135 °C | Pa·s | 3.9 | 0.51 | ||
Ash content | % | 23 | 0.01 | 37.16 | |
RTFOT | Quality change | % | −0.04 | −0.95 | |
Penetration ratio | % | 74.8 | 74.2 | ||
Ductility: 10 °C | cm | 10.5 | |||
Ductility: 15 °C | cm | 25.1 |
Test Items | Unit | Test Result |
---|---|---|
Calcium carbonate content | % | 89 |
Apparent relative density | g/cm | 2.765 |
Hydrophilic coefficient | % | 0.6 |
Stability | Do not deteriorate | |
Appearance | Agglomerate-free caking | |
Particle size range < 0.6 mm <0.15 mm <0.075 | % | 100 100 99.3 |
Test Items | Unit | Test Result |
---|---|---|
Loss on ignition | % | 1.2 |
SO content | % | 0.6 |
MgO content | % | 1 |
Insoluble matter content | % | 0.5 |
Particle size range 0.08 mm (square hole sieve) | % | 98.5 |
Shear Rate (s−1) | a | b | c | d | R2 |
---|---|---|---|---|---|
0.01 | 0.0155 | 0.168 | 0.611 | 0.529 | 0.953 |
0.1 | 0.0214 | 0.0676 | 0.586 | 0.00235 | 0.961 |
1 | 0.00356 | 0.0300 | 0.00794 | 0.0286 | 0.923 |
10 | 0.00100 | 0.0430 | 0.0991 | 0.0991 | 0.819 |
100 | 4.50 × 10−5 | 0.0643 | 0.0282 | 0.210 | 0.768 |
Shear Rate (s−1) | Equation | R2 | ||||
---|---|---|---|---|---|---|
0.01 | Index | 12.9 | 8.05 | 35.90 | 0.996 | |
Expansion index | 42.6 | 6.57 | 0.145 | 0.165 | 0.996 | |
0.1 | Index | 6.52 | 3.73 | 12.4 | 0.99 | |
Expansion index | 16.8 | 3.69 | 0.577 | 0.327 | 0.99 | |
1 | Index | 2.55 | 1.58 | 30.3 | 0.989 | |
Expansion index | 2.52 | 1.58 | 3.73 | 1.14 | 0.989 | |
10 | Index | 0.66 | 0.500 | 44.3 | 0.687 | |
Expansion index | 0.674 | 0.540 | 18.0 | 13.8 | 0.82 | |
100 | Index | 0.390 | 0.210 | 287 | 0.557 | |
Expansion index | 0.427 | 0.409 | 15.9 | 1.24 | 0.78 |
Shear Rate (s−1) | a | b | c | d | R2 |
---|---|---|---|---|---|
0.01 | 0.0949 | 0.631 | 1.14 | 0.629 | 0.991 |
0.1 | 0.0222 | 0.477 | 0.673 | 0.776 | 0.772 |
1 | 0.00164 | 0.0355 | 0.00287 | 0.0597 | 0.582 |
10 | 0.00129 | 0.0761 | 0.00286 | 0.0207 | 0.512 |
100 | 3.43 × 10−5 | 0.0431 | 0.0757 | 0.0241 | 0.01 |
Shear Rate (s−1) | Equation | R2 | ||||
---|---|---|---|---|---|---|
0.01 | Index | 22.0 | 13.4 | 9.83 | 0.999 | |
Expansion index | 23.0 | 13.4 | 10.6 | 0.780 | 0.999 | |
0.1 | Index | 6.71 | 5.50 | 19.7 | 0.939 | |
Expansion index | 931 | 5.47 | 44.1 | 0.00100 | 0.984 | |
1 | Index | 3.14 | 2.32 | 40.1 | 0.985 | |
Expansion index | 3.28 | 2.32 | 48.8 | 0.650 | 0.987 | |
10 | Index | 2.38 | 1.87 | 10.9 | 0.842 | |
Expansion index | 0.74 | 1.86 | 24.1 | −0.140 | 0.849 | |
100 | Index | 1.65 | 1.52 | 32.1 | 0.551 | |
Expansion index | 2.99 | 1.51 | 78.9 | 0.0300 | 0.756 |
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Zhang, S.; Luo, C.; Huang, Z.; Li, J. Study on Thixotropy of Mastic Asphalt Binder and Asphalt Mastic. Buildings 2023, 13, 2380. https://doi.org/10.3390/buildings13092380
Zhang S, Luo C, Huang Z, Li J. Study on Thixotropy of Mastic Asphalt Binder and Asphalt Mastic. Buildings. 2023; 13(9):2380. https://doi.org/10.3390/buildings13092380
Chicago/Turabian StyleZhang, Shunxian, Chuanxi Luo, Zhiyong Huang, and Jian Li. 2023. "Study on Thixotropy of Mastic Asphalt Binder and Asphalt Mastic" Buildings 13, no. 9: 2380. https://doi.org/10.3390/buildings13092380