Study on Prevention and Treatment Strategy of Asphalt Ultraviolet (UV) Aging Based on UV Climate Zoning in China
Abstract
:1. Introduction
- Evaluation method based on molecular dynamics index [20].
- The influence of UV radiation on asphalt has not been expressed uniformly and clearly, and there is no standard test method for the UV aging of asphalt in the current specification;
- There is a lack of practical climate zoning for asphalt UV radiation;
- The equivalent relationship of asphalt UV aging between different UV radiation areas has not been established;
- There is a lack of anti-UV aging prevention methods for asphalt in different UV radiation areas.
2. Climate Zoning of Asphalt UV Radiation in China
3. UV Aging Law of Asphalt
3.1. Test Scheme
3.1.1. Test Conditions
3.1.2. Raw Materials
3.1.3. Test Design
3.2. Analysis of Test Results
3.2.1. Penetration, Softening Point and Ductility
3.2.2. Rheological Properties of Asphalt
4. UV Prevention Strategies Based on Aging Equivalence Relationships
4.1. Selection of Aging Equivalent Index
- The index is sensitive to UV radiation and has a certain degree of discrimination;
- The index has a strong regularity with the UV radiation, and the UV aging equation can be established to track the index;
- The index is easy to obtain, the error is small, and it can be popularized.
4.2. UV Aging Equation of Asphalt
4.3. Equivalent Relation of UV Aging of Asphalt
5. Examples of UV Aging Prevention of Asphalt
5.1. Selection of Trial Section
- The trial road crosses at least two climatic zones of UV radiation, and the annual radiation amount difference is large.
- The pavement structure, construction materials, construction machinery, construction technology, and completion time of all sections of the trial road are the same.
- The traffic volume after opening to traffic is basically the same.
5.2. Anti-UV Aging Scheme
5.3. Results Observation
6. Conclusions
- The asphalt UV climate zone I is the area with annual UV radiation less than or equal to 69.4 kW·h/m2 in the most recent 30 years, zone II is areas with annual UV radiation of 69.4~81.4 kW·h/m2 in the most recent 30 years, and zone III is areas with annual UV radiation more than or equal to 81.4 kW·h/m2 in the most recent 30 years;
- The greater the amount of UV radiation, the greater the loss rate of penetration and ductility. For the same kind of asphalt, there is a relatively stable functional relationship between the loss rate and the amount of UV radiation.
- For asphalt, the G* increases and δ decreases with increasing UV aging time, which indicates that the elastic component of the asphalt response becomes more dominant and the viscous component less dominant with UV aging.
- The penetration loss rate and ductility loss rate of asphalt can be used as equivalent UV aging indexes of asphalt.
- Under the same outdoor UV irradiation time, if asphalt wants to achieve the same technical performance as in zone I, the anti-UV ability of zone II needs to be improved by more than 5%, and that of zone III needs to be improved by more than 10%.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Technical Parameters | Asphalt | ||||||
---|---|---|---|---|---|---|---|
50# | 70# | 90# | 110# | SBS I-C | SBS I-D | ||
Penetration at 25 °C, 0.1 mm | 53.8 | 68.5 | 91.7 | 109.2 | 72.7 | 55.1 | |
Softening point, °C | 50.3 | 47.4 | 46.3 | 43.8 | 66.3 | 71.5 | |
Ductility at 10 °C, cm | 18.7 | 27.5 | 34.6 | 46.9 | —— | —— | |
Ductility at 5 °C, cm | —— | —— | —— | —— | 35.3 | 27.8 | |
RTFOT 1 | Mass Change, % | 0.5 | 0.45 | 0.67 | 0.71 | 0.87 | 0.73 |
Residual penetration ratio at 25 °C, % | 71.1 | 68.9 | 66.5 | 62.3 | 75.8 | 71.3 | |
Residual ductility at 10 °C, cm | 7.6 | 9.1 | 10.2 | 13.4 | —— | —— | |
Residual ductility at 5 °C, cm | —— | —— | —— | —— | 25.3 | 19.7 |
Asphalt | Indexes | Dynamic UV Aging Equation | R2 |
---|---|---|---|
50# | Penetration at 25 °C, 0.1 mm | P(t) = −0.0830/(1 − 1.0016 × e0.0080t) | 0.93 |
Ductility at 10 °C, cm | P(t) = −0.0037/(1 − 1.0002 × e0.0090t) | 0.95 | |
70# | Penetration at 25 °C, 0.1 mm | P(t) = −0.0070(1 − 1.0001 × e0.0070t) | 0.96 |
Ductility at 10 °C, cm | P(t) = −0.0385/(1 − 1.00144 × e0.0103t) | 0.98 | |
90# | Penetration at 25 °C, 0.1 mm | P(t) = 3.7597/(1 − 0.9590 × e0.0060t) | 0.97 |
Ductility at 10 °C, cm | P(t) = −0.0440/(1 − 1.0013 × e0.0114t) | 0.96 | |
110# | Penetration at 25 °C, 0.1 mm | P(t) = −0.3276/(1 − 1.0300 × e0.0040t) | 0.98 |
Ductility at 10 °C, cm | P(t) = −0.0327/(1 − 1.0007 × e1.01087t) | 0.99 | |
SBS I-C | Penetration at 25 °C, 0.1 mm | P(t) = 0.0247/(1 − 0.99966 × e0.0033t) | 0.97 |
Ductility at 5 °C, cm | P(t) = 0.0055/(1 − 0.99843 × e0.0475t) | 0.94 | |
SBS I-D | Penetration at 25 °C, 0.1 mm | P(t) = 4.2360/(1 − 0.92311 × e0.0027t) | 0.96 |
Ductility at 5 °C, cm | P(t) = −30.8858/(1 − 2.1110 × e0.0056t) | 0.95 |
UV Climatic Zones | UV Radiation in Laboratory, kW·h/m2 | Test Time in Laboratory, h | Equivalent Time of Outdoor, Months |
---|---|---|---|
I | 34.7 | 110 | 6 |
II | 34.7 | 110 | 5.1 |
III | 34.7 | 110 | 3.6 |
UV Climatic Zones | Time of Outdoor, months | UV Radiation in Laboratory, kW·h/m2 | Equivalent Test Time in Laboratory, h |
---|---|---|---|
I | 6 | 34.7 | 110 |
II | 6 | 40.7 | 129 |
III | 6 | 57.5 | 183 |
Asphalt | Penetration Loss Rate, % | Ductility Loss Rate, % | ||||
---|---|---|---|---|---|---|
I | II | III | I | II | III | |
50# | 62.1 | 64.5 | 69.5 | 63.1 | 65.8 | 71.1 |
70# | 53.7 | 57.2 | 61.0 | 68.0 | 70.9 | 76.7 |
90# | 49.0 | 52.6 | 57.3 | 71.7 | 76.0 | 80.3 |
110# | 41.8 | 44.0 | 49.5 | 69.3 | 72.3 | 75.7 |
SBS I-C | 31.9 | 36.3 | 39.6 | 43.1 | 46.5 | 49.6 |
SBS I-D | 28.3 | 30.3 | 36.1 | 48.9 | 51.4 | 56.8 |
Asphalt | Penetration Loss Rate, %, (The Difference from I, %) | Ductility Loss Rate, %, (The Difference from I, %) | ||
---|---|---|---|---|
II | III | II | III | |
50# | 2.4 | 7.4 | 2.7 | 8.0 |
70# | 3.5 | 7.3 | 2.9 | 8.7 |
90# | 3.6 | 8.3 | 4.3 | 8.7 |
110# | 2.1 | 7.7 | 3.0 | 6.4 |
SBS I-C | 4.4 | 7.7 | 3.4 | 6.5 |
SBS I-D | 2.0 | 7.8 | 2.5 | 7.9 |
Indexes | SBS I-C | SBS I-C with Anti-UV Aging Agent | |
---|---|---|---|
Penetration, 0.1 mm | 68.2 | 69.6 | |
softening point, °C | 60.9 | 59.9 | |
ductility at 5 °C, cm | 40.1 | 40.7 | |
Penetration loss rate after UV aging, % | 157.5 W/m2, 110 h | 30.8 | —— |
157.5 W/m2, 129 h | —— | 30.5 | |
Ductility loss rate at 5 °C after UV aging, % | 157.5 W/m2, 110 h | 42.9 | —— |
157.5 W/m2, 129 h | —— | 43.1 |
Trial Sections | UV Zones | Project Overview | Observation Time | Disease Situation | PCI 1 |
---|---|---|---|---|---|
Trial 1 | I | The anti-UV aging agent is used in trial section 2, and the other working conditions are basically the same | The beginning of the third year | Almost no disease, light loose disease | 94 |
Trial 2 | II | There are transverse cracks and a few pits, loose disease | 91 | ||
Trial 3 | III | Almost no disease, light loose disease | 94 |
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Zou, L.; Lou, Z.; Li, M.; Xue, H.; Chen, Y.; Zhang, W. Study on Prevention and Treatment Strategy of Asphalt Ultraviolet (UV) Aging Based on UV Climate Zoning in China. Appl. Sci. 2021, 11, 6665. https://doi.org/10.3390/app11146665
Zou L, Lou Z, Li M, Xue H, Chen Y, Zhang W. Study on Prevention and Treatment Strategy of Asphalt Ultraviolet (UV) Aging Based on UV Climate Zoning in China. Applied Sciences. 2021; 11(14):6665. https://doi.org/10.3390/app11146665
Chicago/Turabian StyleZou, Ling, Zhongbo Lou, Minghui Li, Honghua Xue, Yu Chen, and Wengang Zhang. 2021. "Study on Prevention and Treatment Strategy of Asphalt Ultraviolet (UV) Aging Based on UV Climate Zoning in China" Applied Sciences 11, no. 14: 6665. https://doi.org/10.3390/app11146665
APA StyleZou, L., Lou, Z., Li, M., Xue, H., Chen, Y., & Zhang, W. (2021). Study on Prevention and Treatment Strategy of Asphalt Ultraviolet (UV) Aging Based on UV Climate Zoning in China. Applied Sciences, 11(14), 6665. https://doi.org/10.3390/app11146665