Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen
Abstract
:1. Introduction
2. Materials and Test Methods
2.1. Materials and Preparation
2.2. Procedure of UV Aging
2.3. Rotational Viscometer and DSR Test
2.4. UV-Vis Test
2.5. TLC-FID Test
2.6. FTIR Test
2.7. Physical Properties Test
3. Results and Discussions
3.1. Reflectance of LDHs
3.2. Effect of UV Aging on Rheology of LDH-Modified Bitumen
3.2.1. Dynamic Viscosity
Type of Bitumen | V1 of Fresh Bitumen (Pa·s) | V2 of Bitumen after UV Aging (Pa·s) | VAI * |
---|---|---|---|
Base | 0.325 ± 0.001 | 2.786 ± 0.002 | 7.6 |
Mg-Al-LDHs + Base | 0.451 ± 0.002 | 1.395 ± 0.002 | 2.1 |
Zn-Al-LDHs + Base | 0.430 ± 0.002 | 1.262 ± 0.002 | 1.9 |
3.2.2. Complex Modulus and Phase Angle
3.3. Effect of UV Aging on Chemistry of LDH-Modified Bitumen
3.3.1. Analysis of TLC-FID
Type of Bitumen | Saturates (%) | Aromatics (%) | Resins (%) | Asphaltenes (%) | Ic |
---|---|---|---|---|---|
Base-fresh | 11.88 | 36.78 | 43.02 | 8.32 | 3.95 |
Mg-Al-LDHs + Base-fresh | 12.53 | 37.20 | 42.99 | 7.28 | 4.05 |
Zn-Al-LDHs + Base-fresh | 12.20 | 35.82 | 44.80 | 7.18 | 4.16 |
Base-UV aging | 12.13 | 25.74 | 41.41 | 20.72 | 2.04 |
Mg-Al-LDHs + Base-UV aging | 11.39 | 30.10 | 40.34 | 19.77 | 2.26 |
Zn-Al-LDHs + Base-UV aging | 10.96 | 26.73 | 43.77 | 18.54 | 2.39 |
3.3.2. Analysis of FTIR
Sample | Index | Fresh | UV Aging |
---|---|---|---|
Base | IC=O | 0.0036 | 0.0200 |
IS=O | 0.0100 | 0.0440 | |
Mg-Al-LDHs + Base | IC=O | 0.0036 | 0.0179 |
IS=O | 0.0100 | 0.0356 | |
Zn-Al-LDHs + Base | IC=O | 0.0037 | 0.0140 |
IS=O | 0.0100 | 0.0260 |
3.4. Effect of UV Aging on Physical Properties of LDH-Modified Bitumen
Type of Bitumen | Penetration (25 °C, dmm) | PRR * (%) | Softening Point (°C) | SPI * (°C) | ||
---|---|---|---|---|---|---|
Fresh | UV Aging | Fresh | UV Aging | |||
Base | 87 ± 1 | 53 ± 2 | 61 | 49.4 ± 0.2 | 66.9 ± 0.2 | 17.5 |
Mg-Al-LDHs + Base | 68 ± 2 | 56 ± 1 | 82 | 51.8 ± 0.2 | 62.5 ± 0.4 | 10.7 |
Zn-Al-LDHs + Base | 72 ± 1 | 61 ± 2 | 85 | 51.4 ± 0.2 | 59.5 ± 0.2 | 8.1 |
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Liu, X.; Wu, S.; Liu, G.; Li, L. Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen. Materials 2015, 8, 5238-5249. https://doi.org/10.3390/ma8085238
Liu X, Wu S, Liu G, Li L. Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen. Materials. 2015; 8(8):5238-5249. https://doi.org/10.3390/ma8085238
Chicago/Turabian StyleLiu, Xing, Shaopeng Wu, Gang Liu, and Liping Li. 2015. "Effect of Ultraviolet Aging on Rheology and Chemistry of LDH-Modified Bitumen" Materials 8, no. 8: 5238-5249. https://doi.org/10.3390/ma8085238