Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator

It has become one of the research directions of intelligent materials for self-healing asphalt pavements to use a bionic microvascular containing oily rejuvenator. The rejuvenator in a microvascular can carry out the healing of asphalt micro-cracks, thus reducing the damage to and prolonging the lif...

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Autores principales:	Peng Yang, Li-Qing Wang, Xu Gao, Sai Wang, Jun-Feng Su
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	self-healing microvascular asphalt rejuvenator microstructure tensile test Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/cfcbe44ff449402fad13ba168a5b5a61
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spelling	oai:doaj.org-article:cfcbe44ff449402fad13ba168a5b5a612021-11-11T18:00:29ZSmart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator10.3390/ma142164311996-1944https://doaj.org/article/cfcbe44ff449402fad13ba168a5b5a612021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6431https://doaj.org/toc/1996-1944It has become one of the research directions of intelligent materials for self-healing asphalt pavements to use a bionic microvascular containing oily rejuvenator. The rejuvenator in a microvascular can carry out the healing of asphalt micro-cracks, thus reducing the damage to and prolonging the life of asphalt pavement. The aim of this work was to investigate the smart self-healing capability of an asphalt/microvascular material through its microstructure and mechanical properties. Microstructure observation indicated no interface separation between the microvasculars and bitumen matrix. Micro-CT images showed that microvasculars dispersed in asphalt samples without accumulation or tangles. The phenomenon of microcracks healing without intervention was observed, which proved that the fractured asphalt sample carried out the self-healing process with the help of rejuvenator diffusing out from the broken microvasculars. The self-healing efficiency of asphalt samples was also evaluated through a tensile test considering the factors of microvasculars content, healing time and healing temperature. It was found that the tensile strength of the asphalt samples was greatly enhanced by the addition of microvasculars under a set test condition. Self-healing efficiency was enhanced with more broken microvasculars in the rupture interface of the asphalt sample. During two self-healing cycles, the self-healing efficiency of the asphalt sample with three microvascular per 1 cm<sup>2</sup> of a broken interface were able to reach 80% and 86%. This proves that microvasculars containing rejuvenator play a practical role in the self-healing process of asphalt. With an increase in temperature from 0 to 30 °C, the self-healing capability of the asphalt samples increased dramatically. An increase in time increased the self-healing capability of the bitumen samples. At last, a preliminary mathematical model also deduced that the self-healing efficiency was determined by the individual healing steps, including release, penetration and diffusion of the rejuvenator agent.Peng YangLi-Qing WangXu GaoSai WangJun-Feng SuMDPI AGarticleself-healingmicrovascularasphaltrejuvenatormicrostructuretensile testTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6431, p 6431 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	self-healing microvascular asphalt rejuvenator microstructure tensile test Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	self-healing microvascular asphalt rejuvenator microstructure tensile test Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Peng Yang Li-Qing Wang Xu Gao Sai Wang Jun-Feng Su Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
description	It has become one of the research directions of intelligent materials for self-healing asphalt pavements to use a bionic microvascular containing oily rejuvenator. The rejuvenator in a microvascular can carry out the healing of asphalt micro-cracks, thus reducing the damage to and prolonging the life of asphalt pavement. The aim of this work was to investigate the smart self-healing capability of an asphalt/microvascular material through its microstructure and mechanical properties. Microstructure observation indicated no interface separation between the microvasculars and bitumen matrix. Micro-CT images showed that microvasculars dispersed in asphalt samples without accumulation or tangles. The phenomenon of microcracks healing without intervention was observed, which proved that the fractured asphalt sample carried out the self-healing process with the help of rejuvenator diffusing out from the broken microvasculars. The self-healing efficiency of asphalt samples was also evaluated through a tensile test considering the factors of microvasculars content, healing time and healing temperature. It was found that the tensile strength of the asphalt samples was greatly enhanced by the addition of microvasculars under a set test condition. Self-healing efficiency was enhanced with more broken microvasculars in the rupture interface of the asphalt sample. During two self-healing cycles, the self-healing efficiency of the asphalt sample with three microvascular per 1 cm<sup>2</sup> of a broken interface were able to reach 80% and 86%. This proves that microvasculars containing rejuvenator play a practical role in the self-healing process of asphalt. With an increase in temperature from 0 to 30 °C, the self-healing capability of the asphalt samples increased dramatically. An increase in time increased the self-healing capability of the bitumen samples. At last, a preliminary mathematical model also deduced that the self-healing efficiency was determined by the individual healing steps, including release, penetration and diffusion of the rejuvenator agent.
format	article
author	Peng Yang Li-Qing Wang Xu Gao Sai Wang Jun-Feng Su
author_facet	Peng Yang Li-Qing Wang Xu Gao Sai Wang Jun-Feng Su
author_sort	Peng Yang
title	Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
title_short	Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
title_full	Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
title_fullStr	Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
title_full_unstemmed	Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator
title_sort	smart self-healing capability of asphalt material using bionic microvascular containing oily rejuvenator
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cfcbe44ff449402fad13ba168a5b5a61
work_keys_str_mv	AT pengyang smartselfhealingcapabilityofasphaltmaterialusingbionicmicrovascularcontainingoilyrejuvenator AT liqingwang smartselfhealingcapabilityofasphaltmaterialusingbionicmicrovascularcontainingoilyrejuvenator AT xugao smartselfhealingcapabilityofasphaltmaterialusingbionicmicrovascularcontainingoilyrejuvenator AT saiwang smartselfhealingcapabilityofasphaltmaterialusingbionicmicrovascularcontainingoilyrejuvenator AT junfengsu smartselfhealingcapabilityofasphaltmaterialusingbionicmicrovascularcontainingoilyrejuvenator
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Smart Self-Healing Capability of Asphalt Material Using Bionic Microvascular Containing Oily Rejuvenator

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