Self-healing performance of asphalt mixtures through heating fibers or aggregate

Sun, Yihan; Wu, Shaopeng; Liu, Quantao; Zeng, Wenbo; Chen, Zongwu; Ye, Qunshan; Pan, Pan

doi:10.1016/j.conbuildmat.2017.06.007

Cited by 97 publications

(28 citation statements)

References 15 publications

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“…Recently, researchers used the electrical and physical properties of fibres to create asphalt mixtures with crack-healing capabilities by external heating with electromagnetic induction [11] or microwave radiation [12][13][14][15]. For the induction heating, an electrical current is applied to conductive coils, creating an alternating electromagnetic field that generates a current in the metallic fibres added to the asphalt mixtures, increasing their temperature by polarisation effects [21]. For the microwave heating, radiation creates electromagnetic waves that produce a change in the orientation of the polar molecules of the asphalt mixture [13], in particular metals, producing an internal friction in the material structure that increases its temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The crack-healing capability of this type of mixtures is promising. Sun et al [21] compared the strength recovery of mixtures with fibres heated by microwave and induction, concluding that the healing performance of asphalt samples heated with microwave was slightly better than samples heated with induction. This was previously demonstrated by Norambuena-Contreras and García [13] who, in addition to the crack-healing properties, studied the internal structure of this type of asphalt mixtures using X-ray microtomography, concluding that virgin metallic fibres modify their internal structure, increasing or decreasing the porosity of the material.…”

Section: Introductionmentioning

confidence: 99%

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Effect of metallic waste addition on the electrical, thermophysical and microwave crack-healing properties of asphalt mixtures

Norambuena-Contreras

González

Concha

et al. 2018

Construction and Building Materials

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Effect of metallic waste addition on the electrical, thermophysical and microwave crackhealing properties of asphalt mixtures Norambuena-Contreras, J.; Gonzalez, A.; Concha, J. L.; Gonzalez-Torre, I.; Schlangen, E. h i g h l i g h t sFibres and shavings from metallic waste were added in asphalt mixtures. Electrical, thermophysical and microwave crack-healing properties of asphalt were evaluated. CT-Scan results showed that shavings were crushed during asphalt mixing process. Metallic waste addition did not improve thermal and electrical properties. Healing levels after microwave heating times of 40 s twice those obtained after 30 s. a b s t r a c tThis paper aims to evaluate the effect of metallic waste addition on the electrical, thermophysical and microwave crack-healing properties of asphalt mixtures. With this purpose, asphalt mixtures with two different types of metallic waste, steel wool fibres and steel shavings, added in four different contents, were tested. Electrical and thermophysical properties of asphalt mixture specimens with, and without, metallic waste were measured. The spatial distribution of the metallic waste inside the asphalt mixture samples was evaluated by using X-ray computed tomography. In addition, crack-healing properties of asphalt samples using microwave radiation heating were assessed at two different healing times, 30 s and 40 s. To quantify the efficiency of the healing process, five healing cycles were carried out for each asphalt sample. The main results showed that asphalt mixtures with shavings presented lower air void contents than mixtures with fibres. Moreover, fibres produced an increase in the electrical conductivity of the mixtures because long fibres in the mixtures form electrically conductive channels. In contrast, shavings did not have significant effect on the electrical properties of the mixtures. Likewise, it was proven that metallic waste reduced the thermal conductivity and the specific heat capacity of asphalt mixtures. Conversely, shavings decreased the thermal diffusivity of asphalt mixtures regardless of their content. Overall, it was found that the healing level reached by the asphalt mixtures tested by microwave radiation depends on the healing time and the type and content of metallic waste used. CT-scans results proved that the spatial distribution of metallic waste inside the asphalt mixture samples was not uniform and played an important role in the asphalt self-healing properties using microwave radiation heating.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of metallic waste addition on the electrical, thermophysical and microwave crack-healing properties of asphalt mixtures

Norambuena-Contreras

González

Concha

et al. 2018

Construction and Building Materials

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“…To compare the healing efficiency of asphalt with steel fibers (healing through heating of fibers) at the one hand and steel slag aggregates (healing through heating of aggregates) at the other hand, Sun et al made use of infrared thermal imaging. As in these asphalt mixtures, healing is triggered by heating, it is important that exposure of the material to induction of microwave heating results in a uniform temperature increase of the material.…”

Section: Healing Efficiencymentioning

confidence: 99%

Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Snoeck

Malm

Cnudde

et al. 2018

Adv Materials Inter

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When studying the self‐healing properties of construction materials, a plethora of destructive and nondestructive testing (NDT) techniques can be used. In this review, the applicability of different nondestructive test methods is discussed in detail. The methods can be categorized whether they are used to study the encapsulation and/or protection mechanism of the healing agent, the sequestered healing agent itself, the distribution of healing agents, the trigger mechanism for healing, the healing efficiency, or healing performance. Based on this categorization, nondestructive techniques found in literature are discussed. In this way, a robust understanding of the different techniques can be used for future research on self‐healing construction materials.

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“…In such a way, the cracks within asphalt mastic can be healed quickly without affecting the stone structure. It has been proven by many researchers that induction heating can restore the stiffness, strength and fatigue life and prevent the raveling and cracking of asphalt concrete efficiently without ageing asphalt binder due to very short heating time [10][11][12][13][14][15][16][17][18]. Therefore, induction healing is a promising maintenance technology for asphalt pavement, which can heal the microcracks and prevent them from developing into cracking, stone loss and potholes.…”

Section: Introductionmentioning

confidence: 99%

“…Sun et al prepared asphalt concrete by replacing mineral aggregates with steel slag and found that it can be heated at 11.6 • C/min with induction heating [11]. He et al prepared asphalt mixture by adding 4% steel shots and found that its induction heating speed is 33.8 • C/min [15].…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanical, Thermal, Induction Heating and Healing Properties of Steel Slag/Steel Fibers Composite Asphalt Mixture

Liu

Schlangen

et al. 2017

Applied Sciences

Self Cite

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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 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.

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Self-healing performance of asphalt mixtures through heating fibers or aggregate

Cited by 97 publications

References 15 publications

Effect of metallic waste addition on the electrical, thermophysical and microwave crack-healing properties of asphalt mixtures

Effect of metallic waste addition on the electrical, thermophysical and microwave crack-healing properties of asphalt mixtures

Validation of Self‐Healing Properties of Construction Materials through Nondestructive and Minimal Invasive Testing

Research on the Mechanical, Thermal, Induction Heating and Healing Properties of Steel Slag/Steel Fibers Composite Asphalt Mixture

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