Abstract
Improving the healing capacity of asphalt is proving to be an effective method to prolong the service life of an asphalt pavement. The calcium alginate capsules encapsulating rejuvenator have been developed and proved to provide successful localized crack healing in asphalt mastic. However, it is not known whether this self-healing asphalt system will improve healing capacity of a full asphalt mix. To this aim, this paper reports on study which investigate effect of the calcium alginate capsules onto self-healing capacity of the porous asphalt mix. X-ray computed tomography (XCT) was used to visualize the distribution of the capsules in porous asphalt. The effect of the capsules on fracture resistance of porous asphalt concrete was studied by semi-circular bending (SCB) tests. A semi-circular bending and healing programme was carried out to evaluate the healing effect of these capsules in porous asphalt concrete. Indirect Tensile Stiffness Modulus (ITSM) tests were employed in order to investigate the influence of the capsules on the stiffness of the porous asphalt concrete. The results indicate that incorporating calcium alginate capsules significantly improve the healing capacity of porous asphalt concrete without compromising its performance.
Highlights
The asphalt healing phenomenon was first reported by Bazin in 1967 [1], since it captured attention of road engineers and material scientists
8 ofimages, thethe calcium alginate capsules, which recognized calcium alginate capsules, which recognizedasasblack blackround roundspots, spots,are areuniformly uniformlydistributed distributedininthe calcium alginate capsules, which recognized as black round spots, are structure uniformly distributed in thethe porous structure together with asphalt mastic
This study explores the potential use of calcium alginate in porous asphalt and following conclusions are drawn:
Summary
The asphalt healing phenomenon was first reported by Bazin in 1967 [1], since it captured attention of road engineers and material scientists. Self-healing became a hotspot in the research field of bituminous materials [2]. In the life cycle of an asphalt pavement, the self-healing capacity of asphalt plays an important role against the fatigue damages, which is considered by pavement engineers in predicting the performance of asphalt pavement [2]. The intrinsic healing capacity of asphalt pavement itself is not sufficient to provide an efficient healing and significant life extension. Aimed to prolong the service life of asphalt pavement with self-healing technologies, more researches focused on the development of extrinsic healing methods in asphalt
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