Self-healing properties of recycled asphalt mixtures containing metal waste: An approach through microwave radiation heating

González, Ana Marta; Norambuena-Contreras, José; Storey, L.; Schlangen, Erik

doi:10.1016/j.jenvman.2018.03.001

Cited by 89 publications

(25 citation statements)

References 20 publications

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“…At 100 • C, for all the mixtures under study, the average HR is 67% (SD = 3.9), while the average HR for the mixtures heated at 40 • C is 44% (SD = 2.9). These results are consistent with those obtained by other authors [20,40,42].…”

Section: Influence Of Slag and Graphene On The Healing Properties Of supporting

confidence: 94%

“…Several authors studied the dielectric properties of asphalt mixture for different applications, such as deicing [35], density measurement [36], recycling [33], and maintenance purposes [34,37]. Since the microwave susceptibility of conventional asphalt mixture is low, some authors have added microwave absorbing additives to the mixture for healing purposes [38], such as steel wool fibers [1,19,39,40], steel slag [2,37,41], steel shaving [42], ferrite [17,18] and carbon nanotubes [43]. Trigos et al proposed a classification of different aggregates frequently used for pavements construction in terms of microwave heating efficiency [44].…”

Section: Introductionmentioning

confidence: 99%

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Microwave Healing Performance of Asphalt Mixture Containing Electric Arc Furnace (EAF) Slag and Graphene Nanoplatelets (GNPs)

et al. 2020

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Pavement preventive maintenance is an important tool for extending the service life of the road pavements. Microwave heating seems to be a promising technology for this application, as bituminous materials have the potential to self-repair above a certain temperature. As ordinary asphalt mixture has low microwave absorbing properties, some additives should be used to improve the heating efficiency. In this paper, the effect of adding Electric Arc Furnace (EAF) slag and Graphene Nanoplatelets (GNPs) on the microwave heating and healing efficiency of asphalt mixtures was evaluated. Microwave heating efficiency was assessed by heating the specimens using several heating times. In addition, the electrical resistivity of the mixtures was measured to understand its possible relationship with the microwave heating process. Furthermore, the healing rates of the asphalt mixtures were assessed by repeated Indirect Tensile Strength (ITS) tests. The results obtained indicate that the additions of graphene and EAF slag can allow important savings, up to 50%, on the energy required to perform a good healing process.

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Section: Influence Of Slag and Graphene On The Healing Properties Of supporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Microwave Healing Performance of Asphalt Mixture Containing Electric Arc Furnace (EAF) Slag and Graphene Nanoplatelets (GNPs)

et al. 2020

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“…The X-ray micro-tomography was performed in a scanner operated at 160 kV and 200 mA, and the images were reconstructed at a spatial resolution of 25 mm (voxel side). The classification of voxels with the different types of materials in the asphalt mixture samples was achieved by segmenting voxel intensity values, with the aim of identifying the different fractions of the mixture components, in particular of the different waste used [14,22].…”

Section: Waste Distribution By X-ray Computed Tomographymentioning

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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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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“…The performance of microwave heating on adhesion and moisture damage of asphalt mixtures has been investigated since 1988 [9]. The effects of the morphology of microwave absorbers [10,11], the thermal expansion of bitumen [12], the addition of metal wastes [13,14] and other factors on microwave self-healing properties have later been discussed. When comparing these self-healing methods, microwave self-healing technology has specific advantages such as shorter heating time, higher heating efficiency and greater economy.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Self-healing properties of recycled asphalt mixtures containing metal waste: An approach through microwave radiation heating

Cited by 89 publications

References 20 publications

Microwave Healing Performance of Asphalt Mixture Containing Electric Arc Furnace (EAF) Slag and Graphene Nanoplatelets (GNPs)

Microwave Healing Performance of Asphalt Mixture Containing Electric Arc Furnace (EAF) Slag and Graphene Nanoplatelets (GNPs)

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

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

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