Abstract
The idea of prolonging the service life of asphalt mixture by improving the self-healing ability of asphalt has received extensive attention in recent years. In view of this, this work synthesized three kinds of encapsulating rejuvenator fibers to improve self-healing properties of asphalt mixtures. A series of characterizations were performed to study the morphology, chemical structure and thermal stability of the three kinds of fibers. Subsequently, the road performance of asphalt mixture containing the fiber were investigated, which included high and low temperature, water sensitivity and fatigue performances. Finally, the self-healing performance of asphalt mixture containing the fiber was investigated by 3PB test. The results revealed that the three kinds of encapsulating rejuvenator fibers were successfully synthesized. The fibers had excellent thermal stability, which met temperature requirements in the mixing and compaction process of asphalt mixtures. Road performance of asphalt mixture containing the fiber met the requirements. Self-healing ability of asphalt mixture containing the fiber was improved. Synergistic action of temperature and rejuvenator could further significantly improve the self-healing ability of the asphalt mixture.
Highlights
Asphalt mixture, which is one of the most widely used pavement materials worldwide, contains bitumen, filler, fine aggregate, and coarse aggregate
The mechanism by which capsules improve the self-healing ability of asphalt is that: when the cracks inside an asphalt mixture develop to the surface of capsules, capsules were ruptured under the action of stress concentration
The whole reaction process is completed in an instant, so, nano SiO2 particles and graphene oxide particles can be completely incorporated into calcium alginate gel
Summary
Asphalt mixture, which is one of the most widely used pavement materials worldwide, contains bitumen, filler, fine aggregate, and coarse aggregate. The mechanism by which capsules improve the self-healing ability of asphalt is that: when the cracks inside an asphalt mixture develop to the surface of capsules, capsules were ruptured under the action of stress concentration. The infiltration and diffusion of rejuvenator can significantly reduce the viscosity of asphalt binder around the cracks, and the flow ability of asphalt is improved [19]. The addition of encapsulating rejuvenator capsules could improve the self-healing properties of asphalt mixture. A lot of studies have been done to synthesize various types of encapsulations containing rejuvenator to improve self-healing capability of asphalt [20,21,22]. The factors that can affect the self-healing efficiency of asphalt mixture were investigated, for example the aging effect, addition order of capsules and temperature. Three-point bending test was performed to evaluate the self-healing capability of asphalt mixture
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