Laboratory Assessment of Deteriorating Performance of Nano Hydrophobic Silane Silica Modified Asphalt
5. Conclusions
Figure 19.TGA test parameters of BA, CBMA and NHSSMA with different F-T cycles. (a) TGA test parameters of asphalt binders without F-T cycles; (b) TGA test parameters of NHSSMA at different F-T cycles.
As shown in Table8, the Tsvalue of CBMA and NHSSMA increased by 49◦C and 46◦C, respectively, compared to BA, and the Tpvalue of CBMA and NHSSMA were 13◦C and 8◦C higher than BA. This indicates that the addition of modifiers effectively improved the thermal properties of asphalt. The Mevalue of BA, CBMA and NHSSMA was 11.8%, 14.62% and 13.86%, respectively. The Me
value of modified asphalt materials was generally 2% to 3% higher than that of unmodified asphalt, which was roughly equal to the amount of the modifiers. This also indirectly indicates the modified asphalt prepared by the high-speed shearing method has good uniformity, and the modifier materials can be well dispersed in the asphalt, which can improve the storage stability of the modified asphalt.
It can be seen from Figure19b that the Ts, T20%, Tp, and Meindex of NHSSMA decreased with the increase of F-T cycles. After 30 F-T cycles, the Tsvalue of BA, CBMA and NHSSMA decreased by 1.9%, 15.2% and 20.4%, the T20%value of BA, CBMA and NHSSMA decreased by 1.5%, 7% and 12.7%, and the Tpvalue of BA, CBMA and NHSSMA decreased by 1%, 4% and 2.7%. This indicates that the TGA parameter variation of the modified asphalt was larger than that of BA. This may be because carbon black and NHSS are inorganic materials, and its connection with asphalt is more likely to be destroyed under the F-T aging process. The decomposition temperature of saturated fraction, aromatic fraction, colloid and asphaltene of asphalt was 300◦C, 412◦C, 438◦C, 472◦C, respectively. When the temperature reached the thermogravimetric termination temperature (Te), the other three components, except the asphaltenes, were basically burnt out. Moreover, the base asphalt used in the test was the same asphalt, and the proportion of the four components of each asphalt sample was basically the same. Therefore, the F-T aging process and the modified material do not affect the Teparameter.
at different F-T cycles compared to BA and CBMA, which indicated that NHSSMA was insensitive to the F-T aging process and had the highest property stability.
4. The TGA test of BA, CBMA and NHSSMA was carried out, and the influence of F-T cycle on the thermal stability of the asphalt was quantitatively based on the TGA parameters. It is found that NHSS can improve the thermal stability of asphalt, but the F-T aging process has a great influence on the thermal property of NHSSMA. This may due to the fact that NHSS is an inorganic material, and its connection with asphalt is more likely to be destroyed under F-T aging process Author Contributions: Data curation, W.G., W.C., Y.L., M.S. and W.D.; Funding acquisition, X.G. and W.D.;
Investigation, W.G. and W.C.; Methodology, W.G.; Project administration, X.G.; Writing—original draft, W.G. and Y.L.; Writing—review & editing, X.G. and W.D.
Funding:This research was funded by the National Nature Science Foundation of China (NSFC) (Grant No.
51178204).
Conflicts of Interest: The authors declare that there are no conflict of interests regarding the publication of this paper.
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