Investigation of the conductivity of asphalt concrete containing conductive fillers

Wu, Shaopeng; Mo, Liantong; Shui, Zhonghe; Zheng, Chengbin

doi:10.1016/j.carbon.2004.12.033

Cited by 200 publications

(108 citation statements)

References 5 publications

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“…6d, graphite additions would increase the heating speed and the efficiency of the system. The problem of graphite is that it reduces the mechanical properties of the material [11], so it should be limited to a minimum, just to avoid the conductivity dropping when the volume of fibers is not enough.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Induction heating of mastic containing conductive fibers and fillers

et al. 2010

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The objective of this research is to examine the induction heating of mastic through the addition of electrically conductive fillers and fibers (graphite and steel wool), and to prove that this material can be healed with induction energy. The effect of fibers content, sand-bitumen ratio and the combination of fillers and fibers on the induction heating of mastic was investigated. It was found that there is an optimum content of fibers for each sandbitumen ratio, above which mastic cannot be heated any more. This optimum seems to coincide with the optimum electrical conductivity of the mixture shown in [1]. It was found that the maximum temperature reached within a certain time period was a function of the sand-bitumen ratio (s-b) and of the volume content of fibers. The mastic could be heated with the addition of a very low volume of conductive fibers. The fastest heating power was obtained with the mix with the maximum electrical conductivity. Gel-Permeation Chromatography (GPC) was also used to show that there is not ageing of bitumen during the heating process.

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Section: Analysis and Discussionmentioning

confidence: 99%

Induction heating of mastic containing conductive fibers and fillers

et al. 2010

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“…In addition, a remarkable enhancement of conductivity was detected using a combination of two or more fillers [52] that could be explained in terms of two kinds of contacts: short range contacts within the clusters and long range contacts due to the bridging effect of fibres [52][53][54].…”

Section: Good Compatibilitymentioning

confidence: 99%

Advanced Self-Healing Asphalt Composites in the Pavement Performance Field: Mechanisms at the Nano Level and New Repairing Methodologies

Agzenai¹,

Pozuelo²,

Sanz³

et al. 2015

NANOTEC

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Abstract:In an effort to give a global view of this field of research, in this mini-review we highlight the most recent publications and patents focusing on modified asphalt pavements that contain certain reinforcing nanoparticles which impart desirable thermal, electrical and mechanical properties. In response to the increasing cost of asphalt binder and road maintenance, there is a need to look for alternative technologies and new asphalt composites, able to self-repair, for preserving and renewing the existing pavements. First, we will focus on the self-healing property of asphalt, the evidences that support that healing takes place immediately after the contact between the faces of a crack, and how the amount of healing can be measured in both the laboratory and the field. Next we review the hypothetical mechanisms of healing to understand the material behaviour and establish models to quantify the damage-healing process. Thereafter, we outline different technologies, nanotechnologies and methodologies used for self-healing paying particular attention to embedded micro-capsules, new nano-materials like carbon nanotubes and nano-fibres, ionomers, and microwave and induction heating processes.

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“…Hence, metallic fibres have been used to develop new flexible pavements with energetic [13] and self-healing purposes via heating processes by electromagnetic induction [12,[14][15][16][17] or microwave radiation [17][18][19][20]. It is known that asphalt pavements have self-healing properties when they reach high temperatures during summer, when the cracks in the road can be closed by themselves [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Microwave Heating Time on the Self-Healing Properties of Asphalt Mixtures

Norambuena-Contreras

Gonzalez-Torre

2017

Applied Sciences

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Featured Application: A new generation of advanced self-healing asphalt pavements is coming. The asphalt mixture presented in this study could be potentially used to build long-life roads with crack-healing properties through electromagnetic heating, e.g., induction and microwaves.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 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.

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Investigation of the conductivity of asphalt concrete containing conductive fillers

Cited by 200 publications

References 5 publications

Induction heating of mastic containing conductive fibers and fillers

Induction heating of mastic containing conductive fibers and fillers

Advanced Self-Healing Asphalt Composites in the Pavement Performance Field: Mechanisms at the Nano Level and New Repairing Methodologies

Influence of the Microwave Heating Time on the Self-Healing Properties of Asphalt Mixtures

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