Study on the Conventional Performance and Microscopic Properties of PPA/SBS-Modified Bio-Mixed Asphalt
2. Materials and Methods
2.2. Preparation of the Modified Asphalt
- Step 1 bio-mixed asphalt preparation: biological and petroleum asphalt were heated to a fluid state, then mixed in a specific ratio and stirred at 1000 rpm for 20 min;
- Step 2 SBS modification: the bio-mixed asphalt was raised to 170 ± 5 °C with continuous stirring, then SBS was added and sheared at 5000 rpm for 40 min, and the stabilizer (sulfur flour, 0.2% of binder by weight) was added in the last 10 min;
- Step 3 PPA modification: PPA was added and sheared at 5000 rpm for 30 min (SBS control group shear for 30 min without PPA addition);
- Step 4 Swelling development: the prepared composite-modified BMA was placed in a vacuum drying oven at 170 °C for 1 h.
2.3. Test Methods
2.3.1. Conventional Property Test
2.3.2. Atomic Force Microscope (AFM)
2.3.3. Fluorescent Microscope (FM)
3. Results and Discussion
3.1. Analysis of the Conventional Property Test
3.2. Microstructure Analysis of the Composite-Modified Asphalt
3.3. Phase Structure Analysis of the Composite-Modified Asphalt
- Through conventional property tests, it was found that the replacement ratio of bio-asphalt had a significant impact on the conventional performance of composite-modified asphalt, but under the optimal content of bio-asphalt, the high and low-temperature performance of the composite-modified asphalt was similar to that of the SBS-modified asphalt. In addition, BA and PPA can improve the storage stability of SBS-modified asphalt.
- Compared with the SBS-modified asphalt, the surface topography of the composite-modified asphalt with bio-asphalt had a higher flatness, indicating that bio-asphalt had a certain positive effect on reducing the molecular heterogeneity among the components of the asphalt.
- Bio-asphalt significantly improved the dispersity of the SBS in asphalt and changed the phase structure of the SBS in asphalt from clumpy to feathered. Although bio-asphalt and PPA improved the storage stability of the SBS-modified asphalt, the SBS particles would accumulate to the bottom when the dosage of the bio-asphalt and PPA was too high.
- In this study, the SBS content of PPA/SBS-modified bio-mixed asphalt was significantly lower than that of single-doped SBS-modified asphalt, but its conventional performance was not significantly lower than that of SBS-modified asphalt. In addition, the application of bio-asphalt in road engineering provides an effective solution for the disposal of waste biomass. Therefore, as a kind of renewable and sustainable material, bio-asphalt has good application prospects in road engineering.
- The reaction mechanism of each component had prominent significance for the performance optimization and engineering application of the composite-modified asphalt. Therefore, the investigation of the chemical reaction mechanisms of each component of the composite-modified asphalt should be the focus of future research.
Conflicts of Interest
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|Relative density (25 °C)||g/cm3||1.24|
|Kinematic viscosity (100 °C)||mm2/s||240|
|Volatility (163 °C, 3 h)||%||0.05|
|4% SBS + AS (100)||A1|
|0.5% PPA + 3.5% SBS + AS:BA (90:10)||A2|
|1% PPA + 3% SBS + AS:BA (90:10)||A3|
|1.5% PPA + 2.5% SBS + AS:BA (85:15)||A4|
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Liu, G.; Zhang, W.; Yang, X.; Ning, Z. Study on the Conventional Performance and Microscopic Properties of PPA/SBS-Modified Bio-Mixed Asphalt. Materials 2022, 15, 4101. https://doi.org/10.3390/ma15124101
Liu G, Zhang W, Yang X, Ning Z. Study on the Conventional Performance and Microscopic Properties of PPA/SBS-Modified Bio-Mixed Asphalt. Materials. 2022; 15(12):4101. https://doi.org/10.3390/ma15124101Chicago/Turabian Style
Liu, Guiyong, Wei Zhang, Xiaolong Yang, and Zhikang Ning. 2022. "Study on the Conventional Performance and Microscopic Properties of PPA/SBS-Modified Bio-Mixed Asphalt" Materials 15, no. 12: 4101. https://doi.org/10.3390/ma15124101