Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation

Zhu, Xingyi; Cai, Yanfei; Zhong, Sheng; Zhu, Jun; Zhao, Hongduo

doi:10.1016/j.conbuildmat.2017.02.145

Cited by 83 publications

(32 citation statements)

References 13 publications

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“…The motion of these molecules is limited by inertia and resisting forces which restrict the motion of molecules and generate random motion and inter-molecular friction that produces heat [7]. Unfortunately, the microwave heating efficiency of ordinary asphalt mixture is very low, due to the low microwave absorbing properties, and for this reason some researchers utilized different additives to improve microwave absorbing properties of asphalt mixture [16], such as steel wool [11] [12], steel slag [17] [13], ferrite [14] and carbon nanotubes [18]. The efficiency of a material in absorbing microwave energy can be described by its dielectric properties [19], usually expressed by the complex permittivity:…”

Section: Introductionmentioning

confidence: 99%

Optimizing Asphalt Mixtures to Be Heated by Microwave

Gallego

Picado

Crucho

2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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Over the last ten years the concept of self healing in asphalt mixtures for roads pavements has been reaching great importance due to the fact that this capability allows a material to recuperate original properties after failure. This new generation of asphalt paving materials would allow road agencies to save no renewable resources as aggregates and bitumen, making the road investments more efficient. By the moment, there are two mechanisms to promote self healing in asphalt pavement: the incorporation in the asphalt mixtures of capsules containing a rejuvenating agent, or the heating of the pavement, especially the surface layer, to melt the asphalt binder, that gets liquid and refills the cracks in the material, recuperating a part of its initial structural parameters. Probably the most promising method for the in situ heating of the pavements is the radiation by microwaves. Unfortunately, asphalt mixture components (aggregates and binder) are low sensitive to microwave energy. This is why it may be advantageous to incorporate in the mixture additives to improve the sensibility to the radiation with microwaves. In this investigation two additives were studied: graphene and EAF slag coming from the steel industry. These additives were incorporated at several contents and the efficiency of the heating process was evaluated by the ratio kwh/kg/ºC in order to optimize the content of the additive in the asphalt mixture. Additionally, an evaluation of the electrical conductivity of the asphalt mixture at different contents of additives was carried out to study the possible relation between the conductivity of the mixture and its sensibility to microwave radiation. As a result of the investigation, it seems that microwave radiation can be a real option to promote in situ self healing of asphalt pavements. References J. Gallego, M.A. del Val, V. Contreras, A. Páez. Use of additives to improve the capacity of bituminous mixtures to be heated by means of microwaves, Materiales de Construcción. Vol. 67, Issue 325, January–March 2017, e110. http://dx.doi.org/10.3989/mc.2017.00416 …

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Section: Introductionmentioning

confidence: 99%

Optimizing Asphalt Mixtures to Be Heated by Microwave

Gallego

Picado

Crucho

2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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“…O processo de autorregeneração não é perpétuo e a sua eficiência é afetada pela magnitude do dano sofrida pela mistura asfáltica. Neste sentido, [6] concluíram que quando as tensões de fadiga reduzem em 60% o módulo de resiliência inicial, a recuperação da vida de fadiga é reduzida significativamente. Da mesma forma, [7] observaram em um experimento que misturas asfálticas de concreto asfáltico denso que sofreram redução em 70% do módulo de resiliência original, a regeneração Artigos Completos alcançada foi baixa em razão da deformação permanente ou quebra dos agregados.…”

Section: Autorregeneração Das Misturas Asfálticasunclassified

“…A autorregeneração em misturas asfálticas ocorre em períodos sem tráfego e em alta temperatura, especificamente entre 30°C a 70°C, dependendo do tipo de ligante utilizado [8]. Entretanto, a autorregeneração é muito lenta em temperatura ambiente e é maior quanto maior o tempo de repouso entre as passagens de cargas [6]. Todos os autores estudados coincidem que o aquecimento do material por meio de uma fonte de energia externa é uma forma de acelerar o processo de auto regeneração artificialmente.…”

Section: Autorregeneração Das Misturas Asfálticasunclassified

Misturas asfálticas autorregenerativas: estado da arte

Joenck¹,

Carpio²

2018

Anais Do STPR

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Resumo: Este artigo tem por objetivo apresentar o estado da arte do desenvolvimento de novas misturas asfálticas autorregenerativas. As misturas asfálticas autorregenerativas são materiais asfálticos capazes de fecharem as trincas oriundas de tensões de fadiga, incrementando a vida de serviço do pavimento e dispensando a remoção da camada de revestimento asfáltico. No Brasil, o tema ainda não ganhou destaque nas publicações acadêmicas em razão de existirem pesquisas relacionadas com o tema ainda em desenvolvimento. No presente trabalho foi realizado um levantamento dos últimos artigos publicados em revistas internacionais e das principais contribuições de pesquisadores. Assim, são apresentados os métodos que permitem baixar a viscosidade do ligante asfáltico de misturas aplicadas em campo a fim de acelerar o processo e o nível de autorregeneração. Por fim, este artigo propôs uma série de recomendações para pesquisas futuras a fim de aprimorar o desenvolvimento destes tipos de misturas.Palavras-chave: Misturas asfálticas autorregenerativas, Fadiga, Indução eletromagnética, Micro-ondas, Microcápsulas.Abstract: This article aims to present the state of the art of new self-healing asphalt mixes development. The self-healing asphalt mixes are materials able to closing cracks from fatigue stresses by themselves, increasing pavemEnet life service and sparing the asphalt pavement removal. In Brazil, the issue has not yet gained prominence in academic publications due to the existence of research related to the topic still being developed. In this research, a survey of the last articles published in international journals and the contributions of the researchers regarding the subject was made. Thus, this article presents methods that allow reducing the constructed asphalt binder viscosity, in order to accelerate the self-healing process. Finally, this article proposes a set of recommendations for future researches in order to improve the development of these types of mixes.

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“…Garcia et al found that porous asphalt mixtures heal faster than the dense mixture, and provide better healing levels [10]. Between the external factors, rest time, temperature and damage degree are the most influential [9,17]. Many researchers have focused on finding the optimal temperature to maximize the healing effect.…”

Section: Introductionmentioning

confidence: 99%

“…If the temperature is too low, bitumen cannot flow through the cracks. However, if the temperature is too high, the healing level decreases, probably due to the expansion of the asphalt mixture, which could cause structural defects in the pavement [17][18][19][20].…”

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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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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Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation

Cited by 83 publications

References 13 publications

Optimizing Asphalt Mixtures to Be Heated by Microwave

Optimizing Asphalt Mixtures to Be Heated by Microwave

Misturas asfálticas autorregenerativas: estado da arte

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

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