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Abstract

Asphalt is prone to aging during use, resulting in the reduced service life of asphalt pavement. To address this problem, nano-titanium dioxide (TiO2) and montmorillonite (MMT) were adopted to modify the anti-aging performance of asphalt. The relationship between the dosage of the modifier and the performance of the modified asphalt was analyzed by Matlab software, thereby determining the optimal dosage of the modifier. The influence of the modifier on the anti-aging performance of the modified asphalt was analyzed by using the high-temperature dynamic shear rheometer (DSR) and low-temperature bending beam rheology (BBR) tests. Finally, scanning electron microscope (SEM) and gel permeation chromatography (GPC) tests revealed the interaction and modification mechanism of the modifiers. The results show that the optimal dosages of nano-TiO2 and MMT modifiers are 2% and 4%, respectively. The synergistic effect of nano-TiO2 and MMT can significantly improve the anti-aging performance of asphalt. Through microscopic experimental analysis, it can be known that nano-TiO2 promotes the adsorption and fusion of MMT in asphalt due to its nano-effect. At the same time, because nano-TiO2 is dispersed in the intercalation structure of MMT, it is difficult for it to agglomerate. The more uniform dispersion makes its modification effect better. The better anti-aging performance of nano-TiO2/MMT composite modified asphalt is also verified by analyzing the molecular weight.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.042

First Page

236

Last Page

241

Submission Date

May 2025

Reference

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