Self-healing of asphalt mixture by microwave and induction heating

2016 ◽  
Vol 106 ◽  
pp. 404-414 ◽  
Author(s):  
J. Norambuena-Contreras ◽  
A. Garcia
Keyword(s):  
Induction Heating ◽  
Asphalt Mixture ◽  
Self Healing

scholarly journals A Review of Asphaltic Crack Healing Approaches and Its Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Mohd Fahmi Haikal Mohd Ghazali ◽  
Mohd Rosli Mohd Hasan ◽  
Anasyida Abu Seman ◽  
Dillon Dipagk Dorett ◽  
Najib Mukhtar ◽  
...  
Keyword(s):  
Electric Field ◽  
Microwave Heating ◽  
Induction Heating ◽  
Molecular Diffusion ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
The Self ◽  
Self Healing ◽  
Road Maintenance ◽  
Conductive Fibers

The concept of self-healing has an excellent potential to extend the life of asphalt pavement. This technology can be considered a sustainable technology due to its ability to reduce the utilization of asphalt mixture production materials used for road maintenance, polluting the environment. It is a complex physicochemical process wherein the molecular diffusion healing mechanisms in asphalt materials are inspired by self-healing polymeric systems, which describe the self-recovery behaviors based on polymer chain dynamics. Several methods have been adopted to improve the self-healing of asphalt, one of which is induction healing. It is the process of heating the asphalt pavement incorporated with an electrically conductive material such as steel fibers, wherein asphalt healing is undertaken via electric field induction. Induction healing via induction heating occurs with eddy current where the electric current flows within the conductive fibers when magnetically susceptible under the magnetic field. Microwave heating is another self-healing method similar to induction in which magnetic radiation is employed to treat asphalt mixtures instead of the electric field-induced induction healing processes. The conductive fibers can absorb the electromagnetic (EM) waves to convert them into heat energy through doublet polarization, interface polarization, and electrical conduction dissipation when placed in the microwave field. These two types of heating systems, which are induction heating and microwave heating, are compared and discussed thoroughly in this study. Finally, some recommendations for the future development of self-healing asphalt are proposed.

scholarly journals Conductive Compartmented Capsules Encapsulating a Bitumen Rejuvenator

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1361
Author(s):  
Amir Tabaković ◽  
Joseph Mohan ◽  
Aleksandar Karač
Keyword(s):  
Production Process ◽  
Induction Heating ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Thermal Characteristics ◽  
Iron Particle ◽  
Uniaxial Compression Test ◽  
Self Healing ◽  
Healing System ◽  
Alginate Capsules

This paper explores the potential use of conductive alginate capsules encapsulating a bitumen rejuvenator as a new extrinsic self-healing asphalt method. The capsules combine two existing self-healing asphalt technologies: (1) rejuvenator encapsulation and (2) induction heating to create a self-healing system that will provide rapid and effective asphalt pavement repair. The work presents a proof of concept for the encapsulation process, which involves embedding the capsules into the bitumen mortar mixture and the survival rate of the capsules in the asphalt mixture. A drip capsule production process was adopted and scaled up to the production of 20l wet capsules at rate of 0.22 l/min. To prove the effectiveness and its ability to survive asphalt production process, the capsules were prepared and subjected to thermogravimetric analysis (TGA) and uniaxial compression Test (UCT). The test results demonstrated that the capsules had suitable thermal characteristics and mechanical strength to survive the asphalt mixing and compaction process. Scanning electron microscopy (SEM) was employed to investigate physiological properties, such as rejuvenator (oil) and iron particle distribution, within the capsules. The electrical resistance tests proved that the capsules were capable of conducting electrical current. The capsules were also tested for their conductive properties in order to determine whether they are capable of conducting and distributing the heat once subjected to induction heating. The results showed that capsules containing higher amounts of iron (alginate/iron powder in a ratio of 20:80 by weight) can efficiently conduct and distribute heat. To prove its success as an asphalt healing system, conductive alginate capsules encapsulating a bitumen rejuvenator were embedded in a bitumen mortar mix. The samples where then subjected to local damaging and healing events, and the degree of healing was quantified. The research findings indicate that conductive alginate capsules encapsulating a bitumen rejuvenator present a promising new approach for the development of an extrinsic self-healing asphalt pavement systems.

scholarly journals Microwave Absorption Ability of Steel Slag and Road Performance of Asphalt Mixtures Incorporating Steel Slag

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 663 ◽  
Author(s):  
Baowen Lou ◽  
Zhuangzhuang Liu ◽  
Aimin Sha ◽  
Meng Jia ◽  
Yupeng Li
Keyword(s):  
Microwave Absorption ◽  
Steel Slag ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Microwave Absorber ◽  
Self Healing ◽  
High Temperature Stability ◽  
Road Performance ◽  
On The Road

Excessive usage of non-renewable natural resources and massive construction wastes put pressure on the environment. Steel slags, the main waste material from the metal industry, are normally added in asphalt concrete to replace traditional aggregate. In addition, as a typical microwave absorber, steel slag has the potential to transfer microwave energy into heat, thus increasing the limited self-healing ability of asphalt mixture. This paper aims to investigate the microwave absorption potentials of steel slag and the effect of its addition on road performance. The magnetic parameters obtained from a microwave vector network analyzer were used to estimate the potential use of steel slag as microwave absorber to heal cracks. Meanwhile, the initial self-healing temperature was further discussed according to the frequency sweeping results. The obvious porous structure of steel slag observed using scanning electron microscopy (SEM) had important impacts on the road performance of asphalt mixtures. Steel slag presented a worse effect on low-temperature crack resistance and water stability, while high-temperature stability can be remarkably enhanced when the substitution of steel slag was 60% by volume with the particle size of 4.75–9.5 mm. Overall, the sustainability of asphalt mixtures incorporating steel slag can be promoted due to its excellent mechanical and microwave absorption properties.

scholarly journals Evaluation of self-healing of asphalt concrete through induction heating and metallic fibers

2017 ◽  
Vol 146 ◽  
pp. 66-75 ◽  
Author(s):  
Yashwanth Pamulapati ◽  
Mostafa A. Elseifi ◽  
Samuel B. Cooper ◽  
Louay N. Mohammad ◽  
Omar Elbagalati
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Self Healing ◽  
Metallic Fibers

Electrical, Thermal and Induction Heating Properties of Dense Asphalt Concrete

2013 ◽  
Vol 723 ◽  
pp. 303-311 ◽  
Author(s):  
Alvaro Garcia ◽  
Jose Norambuena-Contreras ◽  
Manfred N. Partl
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Void Content ◽  
Steel Wool ◽  
Electrically Conductive ◽  
Wool Fibers ◽  
Conductive Fibers ◽  
Different Diameters ◽  
Air Void

Induction heating consists in adding electrically conductive fibers to the asphalt mixture and heating them with an induction heating device. But still, the factors that affect the increase of temperature are not well-known. With this purpose, 25 different mixtures, with the same aggregates distribution and amount of bitumen, but with 2 different lengths, 4 different quantities, and 4 different diameters of steel wool fibers have been considered. The influence of fibers on the air void content, electrical and thermal conductivity and on the induction heating of dense asphalt concrete has been studied. It was found that steel wool fibers increase slightly the electrical and thermal conductivities of dense asphalt concrete. Finally, it has been observed that the temperature reached due to the induction heating, increases with the number of fibers in the mixture and with their diameter.

Study on the effective composition of steel slag for asphalt mixture induction heating purpose

2018 ◽  
Vol 178 ◽  
pp. 542-550 ◽  
Author(s):  
Jiuming Wan ◽  
Shaopeng Wu ◽  
Yue Xiao ◽  
Zongwu Chen ◽  
Dong Zhang
Keyword(s):  
Induction Heating ◽  
Steel Slag ◽  
Asphalt Mixture

scholarly journals Study on Recycling of Steel Slags Used as Coarse and Fine Aggregates in Induction Healing Asphalt Concretes

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 889 ◽  
Author(s):  
Haiqin Xu ◽  
Shaopeng Wu ◽  
Hechuan Li ◽  
Yuechao Zhao ◽  
Yang Lv
Keyword(s):  
Mechanical Property ◽  
Dynamic Stability ◽  
Induction Heating ◽  
Steel Slag ◽  
Ct Scanning ◽  
Asphalt Mixtures ◽  
Steel Fibers ◽  
Fine Aggregate ◽  
Self Healing ◽  
Negative Impacts

Steel slag, a by-product of steelmaking, imposes lots of negative impacts on the environment. For alleviating negative impacts, more and more experiments have been carried out to explore the application possibility of steel slag. The purpose of this study is to explore the feasibility of steel slag being applied in induction healing asphalt concretes to replace coarse and fine aggregate. Surface texture and pore sizes of steel slag were firstly tested, and then steel slag and basalt asphalt mixtures modified with steel fibers were prepared. Moisture susceptibility, dynamic stability, mechanical property, thermal property, induction heating speed, natural cooling speed and healing property of the asphalt mixtures were evaluated. Results showed that steel slags had more obvious holes in the surface while the surface area is much larger than that of basalt. Furthermore, steel fibers and steel slag both have dynamic stability, and steel fibers contribute to increased moisture resistance while steel slag is not. Steel slag asphalt concrete showed better mechanical property and better capacity to store heating. Steel slag asphalt mixtures had a similar heating speed to basalt asphalt mixtures but a significantly slower cooling rate. Finally, the induction healing test and CT scanning test demonstrated that steel slag asphalt mixtures had a similar healing ability to basalt asphalt mixtures. It can be concluded that steel slags have the potential to replace the natural aggregates to be applied in induction heating self-healing asphalt concretes.

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