Novel vascular self-nourishing and self-healing hollow fibers containing oily rejuvenator for bitumen

Zhang, Xiaolong; Su, Jun-Feng; Guo, Yan-Dong; Wang, Xinyu; Yuan, Fang; Zhu, Ding; Han, Ningxu

doi:10.1016/j.conbuildmat.2018.06.181

Cited by 31 publications

(29 citation statements)

References 23 publications

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“…It can be seen through our study that aligning healing fibers in a cementitious matrix can allow more containers across a crack section, which can also contribute to increasing the available volume of healing agent needed to heal the crack. This was confirmed through a study showing that the main advantage of using tubular fibers is the possibility of multiple healing due to their length and their greater encapsulation capacity [ 10 , 11 ]. Such abilities make it possible to heal higher crack widths.…”

Section: Alignment Of Tubular Pvdf Fibers Using Electromagnetic Fieldmentioning

confidence: 85%

“…It has also been stated that the container’s content ratio in composite material and the orientation angle in the case of tubular containers can contribute to increasing the healing capacity [ 10 ]. A preventive point has indicated that although the container’s content ratio in a material can increase the effectiveness of crack healing, this content can also decrease the mechanical properties of that material [ 11 ]. However, it is emphasized that the influence of the tubular fiber’s content on the material’s mechanical properties can be neglected compared to the healing efficiency [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…A preventive point has indicated that although the container’s content ratio in a material can increase the effectiveness of crack healing, this content can also decrease the mechanical properties of that material [ 11 ]. However, it is emphasized that the influence of the tubular fiber’s content on the material’s mechanical properties can be neglected compared to the healing efficiency [ 11 ]. In addition to the decrease in the material’s mechanical properties caused by the tubular fiber’s content ratio, it may not be enough to efficiently improve the healing capability if, despite the encapsulation capacity and the container’s content ratio, it is not ensured to have enough containers across the cracks section.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

Soro

Wang

et al. 2021

Materials

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From the perspective of improving the self-healing method in construction, a tubular healing fiber was adopted as a container to improve the encapsulation capacity, which was available using a micro-capsule as a container. Knowing the direction of the stresses to which structure members are subjected, this research investigated the influence of aligning tubular healing fibers parallel to intended stress into a cementitious composite to increase the self-healing capability. For that, a healing agent was encapsulated into a tubular healing fiber made with polyvinylidene of fluoride resin (PVDF). Then, the healing fiber was combined with steel fibers to align both fibers together parallel to the direction of an intended splitting tensile stress when subjected to a magnetic field in a cylindrical cementitious composite. The alignment method and the key point through which the alignment of the healing fibers could efficiently improve autonomic self-healing were investigated. Since the magnetic field is known to be able to drag steel to an expected direction, steel fibers were combined with the healing fibers to form a hybrid fiber that aligned both fibers together. The required mixture workability was investigated to avoid the sinking of the healing fibers into the mixture. The healing efficiency, according to the orientation of the healing fibers in the composite matrix, was evaluated through a permeability test and a repetitive splitting tensile test. The aligned healing fibers performed better than the randomly distributed healing fibers. However, according to the healing efficiency with aligned healing fibers, it was deduced that the observed decreasing effect of the container’s alignment on the specimen’s mechanical properties was low enough to be neglected.

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Section: Alignment Of Tubular Pvdf Fibers Using Electromagnetic Fieldmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

Soro

Wang

et al. 2021

Materials

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“…Although the road performance of bio-oil-rejuvenated asphalt mixtures varies greatly (it depends on the raw biomass treated, the bio-oil production process, etc. ), this alternative has better environmental benefits when compared to the use of virgin mineral oils [ 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 ]. The rejuvenators can be used in combination with additives like polymers or other modifiers to improve the overall performance and the manageability during the encapsulation process [ 137 , 138 ].…”

Section: Resultsmentioning

confidence: 99%

Self-Healing Asphalt: A Systematic Bibliometric Analysis for Identification of Hot Research Topics during the 2003–2018 Period

Abejón

2021

Materials

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The use of self-healing asphalt is a good option to extend the lifetime of roads and to improve the sustainability of pavement management systems. A bibliometric analysis based on the Scopus database was carried out to review the global research related to self-healing asphalt from 2003 to 2018 and to identify relevant quantitative characteristics from the research in this period. The results from this analysis revealed that the number of accumulated publications followed an exponential growth, which confirmed the relevance that this research topic has gained during the last years. The study revealed that China was the most productive country, followed by the Netherlands, where the most prolific institution is located: Delft University of Technology. Some important research features of the two main approaches most frequently used to develop asphalt mixtures with enhanced self-healing abilities (external heating and encapsulated rejuvenating agents) are compiled in this work.

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“…Wu et al [14] discovered that hollow calcium-alginate polymer fibers were more effective in the self-healing ability of asphalt than spaced calcium-alginate polymer fibers. Su [15] successfully fabricated a polyvinylidene fluoride (PVDF) microvascular by using a single-step spinning process. Test results proved that the microvascular dispersed in bitumen homogeneously and greatly proved the self-healing capability of bitumen.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

Self Cite

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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 cm2 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.

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Novel vascular self-nourishing and self-healing hollow fibers containing oily rejuvenator for bitumen

Cited by 31 publications

References 23 publications

Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

Performance of Self-Healing Cementitious Composites Using Aligned Tubular Healing Fiber

Self-Healing Asphalt: A Systematic Bibliometric Analysis for Identification of Hot Research Topics during the 2003–2018 Period

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

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