基于分子动力学的偶联剂接枝改性玄武岩纤维与沥青粘附特性研究

doi:10.11896/cldb.22110027

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Abstract To enhance the interfacial adhesion property of basalt fiber to asphalt, the basalt fiber surface was modified using the grafted silane coupling agent KH550. The microscopic characterization of KH550 graft-modified basalt fiber was carried out by scanning electron microscopy and infrared spectroscopy, and the interfacial model of asphalt and BF_KH550 was established based on the molecular dynamics method using the ‘chemical grafting' and ‘superposition' approaches. The results show that after KH550 graft modification, the surface of basalt fiber has more bumps and roughness, which increases the adhesion strength between basalt fiber and asphalt. The higher the number of KH550 grafted on the basalt fiber surface, the better the adhesion to the asphalt. The interfacial energy of 20 KH550 grafted on the basalt fiber surface at 25 ℃ increased by 26.1% compared to non-grafted KH550. After KH550 graft modification, the diffusion coefficients of the four components of the asphalt follow the same pattern as without KH550 grafting, being saturated saturate ＞ aromatic ＞ resin ＞ asphaltene, but their overall diffusion coefficients are smaller than without KH550 grafting, indicating that stronger adsorption of KH550 graft-modified basalt fiber to the asphalt has occurred, thus effectively improving the adhesion properties of basalt fiber to the asphalt. The results of the study can provide an important reference for the promotion of basalt fiber in asphalt mixture.

Key words： silane coupling agent KH550 basalt fiber chemical grafting adhesion property molecular dynamics

Published: 25 March 2024 Online: 2024-04-07

CLC number:

U414

Fund:National Natural Science Foundation of China(52208423) and Hunan Graduate Research Innovation Project (CX20210733).

Corresponding Authors: ^*13787155595@163.com;723772885@qq.com

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	YANG Chengcheng
	LIU Li
	LIU Zhaohui
	HUANG You
	LIU Leixin

Cite this article:

YANG Chengcheng,LIU Li,LIU Zhaohui, et al. Study on the Adhesion Characteristics of Silane Coupling Agent Modified Basalt Fiber to Asphalt Based on Molecular Dynamics[J]. Materials Reports, 2024, 38(6): 22110027-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22110027 OR http://www.mater-rep.com/EN/Y2024/V38/I6/22110027

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