Study on the effect and mechanism of oyster shell powder on asphalt

ABSTRACT

In order to explore the effect of oyster shell powder on asphalt. In this paper, oyster shell powder with a fineness of 40 mesh was added to the matrix asphalt in accordance with 3 %, 6 %, 9 %, 12 %, 15 %, and 18 % to prepare oyster shell powder modified asphalt. By establishing the molecular model of oyster shell powder modified asphalt with different contents, the influence of oyster shell powder on the mechanical properties of asphalt was explored from the molecular level. The modification mechanism of oyster shell powder modified asphalt was analyzed in detail from different scales by infrared spectroscopy, scanning electron microscopy, atomic force microscopy, dynamic shear rheology and viscosity tests. The results show that oyster shell powder has a significant effect on the mechanical properties of asphalt. When the content of oyster shell powder is 12 %, oyster shell powder has the greatest influence on the mechanical properties of asphalt.

KEYWORDS:

• Oyster shell powder
• modified asphalt
• mechanical properties
• molecular dynamics theory
• modification mechanism

Acknowledgements

The author thanks the Graduate Student Scientific Research Innovation Project of Changsha University of Science and Technology (CXCLY2022003; 3010102; 1215052) in 2022. At the same time, the author also thanked the Hunan Changsha University of Science and Technology Road Structure and Materials Transportation Industry Key Laboratory of strong support and assistance.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

All data, models, and code generated or used during the study appear in the submitted article.

Additional information

Funding

This work was supported by Graduate Student Scientific Research Innovation Project of Changsha University of Science and Technology (CXCLY2022003; 3010102; 1215052) in 2022.