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Laboratory Assessment of Deteriorating Performance of Nano Hydrophobic Silane Silica Modified Asphalt in Spring-Thaw Season
Open AccessArticle

Assessing the Effect of Nano Hydrophobic Silane Silica on Aggregate-Bitumen Interface Bond Strength in the Spring-Thaw Season

1
School of Transportation, Jilin University, Changchun 130022, China
2
Research Institute of Highway, Ministry of Transport of China, Beijing 100088, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2393; https://doi.org/10.3390/app9122393
Received: 14 May 2019 / Revised: 6 June 2019 / Accepted: 8 June 2019 / Published: 12 June 2019
In the asphalt–aggregate system, the aggregate-bitumen interface cohesive and adhesive bond determine the mechanical properties of asphalt pavement. The presence of moisture leading to adhesive failure at the binder-aggregate interface and/or cohesive failure within the binder or binder-filler mastic is the main mechanisms of moisture damage in the spring-thaw season. In order to evaluate the effect of nano hydrophobic silane silica (NHSS) on aggregate-bitumen interface bond strength in the spring-thaw season, an aggregate-bitumen interface bond strength test was proposed to quantify the interface bond strength of base asphalt and NHSS modified asphalt. Then, the effect of temperature, freeze-thawing cycles and moisture on aggregate-bitumen interface shear strength of base asphalt and NHSS modified asphalt was also discussed. The results illustrated that the shear failure dominated the aggregate-bitumen interface bonding failure in the spring-thaw season, and temperature and moisture had a significant effect on interface shear strength of modified and unmodified asphalt. Moreover, the addition of NHSS could increase the aggregate-bitumen interface shear strength under any working conditions. Furthermore, the moisture damage model of aggregate-bitumen interface shear strength of base asphalt (BA) and NHSS modified asphalt was established based on a research method combining numerical calculations and laboratory tests. View Full-Text
Keywords: seasonally frozen region; spring-thaw season; nano hydrophobic silane silica; aggregate-bitumen interface; bond strength seasonally frozen region; spring-thaw season; nano hydrophobic silane silica; aggregate-bitumen interface; bond strength
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MDPI and ACS Style

Guo, W.; Guo, X.; Li, J.; Li, Y.; Sun, M.; Dai, W. Assessing the Effect of Nano Hydrophobic Silane Silica on Aggregate-Bitumen Interface Bond Strength in the Spring-Thaw Season. Appl. Sci. 2019, 9, 2393.

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