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Self-Healing Asphalt
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Self-Healing Asphalt

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 October 2017) | Viewed by 19244

Special Issue Editor

Prof. Dr. Erik Schlangen

E-Mail Website
Guest Editor
Faculty of Civil Engineering and Geosciences, Micromechanics Laboratory, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
Interests: micromechanics of civil engineering materials; durability mechanics; self healing of materials; lattice modeling for fracture and transport
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Self-healing technology is a new field within material technology. It represents a revolution in materials engineering and is changing the way that materials behave. Incorporating self-healing technology into the road design process has the potential to transform the road construction and maintenance processes by increasing the life span of roads and eliminating the need for road maintenance. By decreasing the unnecessary premature ageing of the asphalt pavements self-healing asphalt will reduce the amount of natural resources used to maintain the road network, decrease the traffic disruption caused by road maintenance processes, decrease CO2 emissions during the road maintenance process and increase road safety. In addition to environmental savings, self-healing materials have the potential to deliver significant cost savings for road network maintenance.

Asphalt is already a self-healing material by nature. When subjected to rest periods, asphalt pavement has the potential to restore its stiffness and strength by closing the micro-cracks, which occur when the pavement is subjected to traffic loads.

Currently there are various research initiatives to improve the self-healing capacity of the asphalt. These technologies deal for instance with nanoparticles, induction heating and rejuvenation from outside or from inside by adding rejuvenator in capsules or fibres.

This Special Issue tries to attract articles in which these new technologies for improving self-healing of asphalt are described. The articles can focus on new concepts, experimental work, numerical modelling or applications of the new materials.

Prof. Erik Schlangen
Guest Editor

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Keywords

  • Self-healing,

  • asphalt,

  • bitumen,

  • capsules,

  • rejuvenation,

  • induction heating,

  • fibres

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Published Papers (3 papers)

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3215 KiB  
Article
Research on the Mechanical, Thermal, Induction Heating and Healing Properties of Steel Slag/Steel Fibers Composite Asphalt Mixture
by Quantao Liu, Bin Li, Erik Schlangen, Yihan Sun and Shaopeng Wu
Appl. Sci. 2017, 7(10), 1088; https://doi.org/10.3390/app7101088 - 20 Oct 2017
Cited by 55 | Viewed by 5255
Abstract
In this paper, steel slag/steel fiber composite asphalt mixture were prepared. The effects of the addition of steel slag and/or steel fibers on the mechanical, thermal, induction heating and healing properties of asphalt mixture were investigated. The results showed that adding steel slag [...] Read more.
In this paper, steel slag/steel fiber composite asphalt mixture were prepared. The effects of the addition of steel slag and/or steel fibers on the mechanical, thermal, induction heating and healing properties of asphalt mixture were investigated. The results showed that adding steel slag and/or steel fibers improves the water stability, particle loss resistance and fracture energy of asphalt mixtures. The addition of steel fibers increased the thermal conductivity and thermal diffusion of the asphalt mixture, and steel slag showed a reverse effect. Steel slag asphalt mixture cooled more slowly than steel fiber asphalt mixture, which is beneficial to crack healing of asphalt mixture. The composite of steel fibers and steel slag can enhance the induction heating speed, heating homogeneity and thus enhance the induction healing ratio of asphalt mixture. It is concluded that steel slag/steel fibers composite asphalt mixture achieves good mechanical and induction healing properties. Full article
(This article belongs to the Special Issue Self-Healing Asphalt)
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7316 KiB  
Article
Influence of the Microwave Heating Time on the Self-Healing Properties of Asphalt Mixtures
by Jose Norambuena-Contreras and Irene Gonzalez-Torre
Appl. Sci. 2017, 7(10), 1076; https://doi.org/10.3390/app7101076 - 18 Oct 2017
Cited by 65 | Viewed by 7464
Abstract
This paper aims to evaluate the influence of the microwave heating time on the self-healing properties of fibre-reinforced asphalt mixtures. To this purpose, self-healing properties of dense asphalt mixtures with four different percentages of steel wool fibres were evaluated as the three-point bending [...] Read more.
This paper aims to evaluate the influence of the microwave heating time on the self-healing properties of fibre-reinforced asphalt mixtures. To this purpose, self-healing properties of dense asphalt mixtures with four different percentages of steel wool fibres were evaluated as the three-point bending strength before and after healing via microwave heating at four different heating times. Furthermore, the thermal behaviour of asphalt mixtures during microwave heating was also evaluated. With the aim of quantifying the efficiency of the repair process, ten damage-healing cycles were done in the test samples. In addition, self-healing results were compared with the fibre spatial distribution inside asphalt samples evaluated by CT-scans. Crack-size change on asphalt samples during healing cycles was also evaluated through optical microscopy. It was found that the heating time is the most influential variable on the healing level reached by the asphalt mixtures tested by microwave radiation. CT-Scans results proved that fibre spatial distribution into the asphalt mixtures play an important role in the asphalt healing level. Finally, it was concluded that 40 s was the optimum heating time to reach the highest healing levels with the lowest damage on the asphalt samples, and that heating times over 30 s can seal the cracks, thus achieving the self-healing of asphalt mixtures via microwave heating. Full article
(This article belongs to the Special Issue Self-Healing Asphalt)
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3095 KiB  
Article
An Evaluation of the Efficiency of Compartmented Alginate Fibres Encapsulating a Rejuvenator as an Asphalt Pavement Healing System
by Amir Tabaković, Luke Schuyffel, Aleksandar Karač and Erik Schlangen
Appl. Sci. 2017, 7(7), 647; https://doi.org/10.3390/app7070647 - 23 Jun 2017
Cited by 42 | Viewed by 4858
Abstract
This paper explores the potential methods for evaluating a healing system for asphalt pavements. The healing system under investigation involves compartmented calcium-alginate fibres encapsulating an asphalt binder healing agent (rejuvenator). This system presents a novel method of incorporating rejuvenators into asphalt pavement mixtures. [...] Read more.
This paper explores the potential methods for evaluating a healing system for asphalt pavements. The healing system under investigation involves compartmented calcium-alginate fibres encapsulating an asphalt binder healing agent (rejuvenator). This system presents a novel method of incorporating rejuvenators into asphalt pavement mixtures. The compartmented fibres are used to distribute the rejuvenator throughout the pavement mixture, thereby overcoming some of the problems associated with alternate asphalt pavement healing methods, i.e., spherical capsules and hollow fibres. The asphalt healing efficiency methods to be evaluated in this paper include: (i) standard test methods for asphalt pavements, such as the Indirect Tensile Strength test and the 4 Point Bending Fatigue test; and (ii) alternative fracture tests such as the Semi Circular Bend test. The study employs fracture theory in order to evaluate the efficiency of the damage repair. The research findings demonstrate that including compartmented calcium-alginate fibres encapsulating a rejuvenator into an asphalt pavement mix does not significantly improve the healing properties of the asphalt pavement. Nevertheless, the findings indicate that, with further enhancement, compartmented calcium alginate fibres may present a promising new approach for the development of self-healing asphalt pavement systems. Additionally, the test results indicate that the 4 point bend fatigue test is the most suitable test for evaluating the performance of self healing asphalt pavements. Full article
(This article belongs to the Special Issue Self-Healing Asphalt)
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