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Abstract

This paper evaluated the influence of microcapsules on the basic properties, rheological performance, and healing performance of asphalt by conducting basic asphalt index tests, temperature scans, frequency scans, linear amplitude scans, and fatigue-healing-fatigue tests. Meanwhile, the influence of microcapsules on the road performance of asphalt mixtures was evaluated by rutting tests, low-temperature bending tests on small beams, and freeze-thaw splitting tests. The results reveal that when the mixing content of microcapsules in asphalt is less than 4%, the addition of microcapsules will not significantly affect the main technical indicators and high-temperature rutting resistance of asphalt. The addition of microcapsules at medium temperatures increases the viscosity ratio of asphalt rubber cement, and microcapsules can enhance the fatigue resistance of asphalt rubber cement to a certain extent. Additionally, the healing degree index of microcapsule asphalt rubber cement increases linearly, indicating that the addition of microcapsules can enhance the fatigue healing performance of asphalt to some extent. The healing index degree of microcapsule asphalt varies with the extending healing time. With the increasing mixing content of microcapsules, the high-temperature stability of the microcapsule asphalt mixture gradually decreases, with improved low-temperature deformation ability and slightly enhanced water stability. The mixing content of microcapsules within the range of 0.4% can meet the road performance requirements.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.050

First Page

322

Last Page

327

Submission Date

March 2025

Reference

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