Observation of the microstructure and shape of self-healing microvascular in asphalt

Wang, Li Qing; Su, Jun-Feng; Gao, Xu

doi:10.1016/j.conbuildmat.2021.123259

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…The D value is determined by the penetration and diffusion process. In previous work [ 18 ], a preliminary mathematical model formula was given as shown in Equation (7),

where a, b, and c are constants. Although this rule may not be an accurate calculation, it still guides the design of the microstructure of shelled microcapsule agents.…”

Section: Resultsmentioning

confidence: 99%

“…The D value is determined by the penetration and diffusion process. In previous work [18], a preliminary mathematical model formula was given as shown in Equation ( 7),…”

Section: Derivation Of Model Between Microscopic Scale and Macroscalementioning

confidence: 99%

“…After the above deduction, the conclusion was that the self-healing efficiency of the microcracks of bitumen is mainly determined by the length of microcracks (L), microcapsule radius (r 1 ), and the number of broken microcapsules (n) as shown in Equation (18). At the same time, the ambient temperature (T) plays a role controlling the kinetic energy and vitality of molecular motion.…”

Section: Derivation Of Model Between Microscopic Scale and Macroscalementioning

confidence: 99%

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Multiscale Mathematical Analysis of Influencing Factors and Experimental Verification of Microcrack Self-Healing Efficiency of Bitumen Composites Using Microcapsules

et al. 2023

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The preparation and application of microcapsules containing healing agents have become a crucial way to enhance the self-healing capability of bitumen. This intelligent material has become a hot topic in the field of pavement material and has greatly stimulated the development and applications of pavement engineering. However, there has been no research focused on the relationship of the multistructures from the viewpoint of molecular-size, microsize, and macrosize, which significantly limits the predictions of the self-healing efficiency and structure design of this self-healing material. The purpose of this study was to make a mathematical analysis of the influencing factors of self-healing efficiency based on the self-healing mechanism of bitumen using microcapsules, fully considering the structural dimensions, preparation conditions, and self-healing conditions. In the mathematical analysis, the cross-linking degree of the shell material molecules of the microcapsules was considered for its damage strength from the perspective of molecular structure. The final tip stress of the microcrack was believed to be equal to the puncture strength of the microcapsules in terms of microsize. From a macroscale point of view, the amount of healing agent released from the microcapsule rupture was considered more significant than or equal to the volume of the microcracks. At the same time, the time–temperature superposition principle was applied to simplify the influence factors. The above derivation based on multiscale structures found that the additive amount of the microcapsules, temperature, and time were the three main influencing factors on the self-healing features of bitumen. Finally, the experimental data was investigated considering the three factors, which thoroughly verified the feasibility of the derivation. All results will help to establish a bridge between the initial structural design of self-healing bitumen and the prediction of the final self-healing effects.

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“…The D value is determined by the penetration and diffusion process. In previous work [ 18 ], a preliminary mathematical model formula was given as shown in Equation (7),

where a, b, and c are constants. Although this rule may not be an accurate calculation, it still guides the design of the microstructure of shelled microcapsule agents.…”

Section: Resultsmentioning

confidence: 99%

“…The D value is determined by the penetration and diffusion process. In previous work [18], a preliminary mathematical model formula was given as shown in Equation ( 7),…”

Section: Derivation Of Model Between Microscopic Scale and Macroscalementioning

confidence: 99%

Section: Derivation Of Model Between Microscopic Scale and Macroscalementioning

confidence: 99%

See 1 more Smart Citation

Multiscale Mathematical Analysis of Influencing Factors and Experimental Verification of Microcrack Self-Healing Efficiency of Bitumen Composites Using Microcapsules

et al. 2023

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“…Then, the microvascular is blended into aged bitumen to investigate the self-healing capability, as shown in Figure 1c. Experimental results showed that triggered microcracks quickly disappeared and aged bitumen had a significant enhancement of self-healing capability with the help of a microvascular [17,18]. To date, the above research results have inspired us to further explore the morphology of the microvascular in asphalt and the self-healing efficiency shown in Figure 1d.…”

Section: Introductionmentioning

confidence: 96%

“…The physical and chemical properties of this microvascular have been characterized. It has been proved that this microvascular maintains good thermal stability and integrity even during the heating process of the asphalt mixture [16][17][18]. Then, the microvascular is blended into aged bitumen to investigate the self-healing capability, as shown in Figure 1c.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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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Preparation and properties of a novel rejuvenator-loaded fiber for asphalt pavement

Hao

2022

Construction and Building Materials

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Observation of the microstructure and shape of self-healing microvascular in asphalt

Cited by 5 publications

References 30 publications

Multiscale Mathematical Analysis of Influencing Factors and Experimental Verification of Microcrack Self-Healing Efficiency of Bitumen Composites Using Microcapsules

Multiscale Mathematical Analysis of Influencing Factors and Experimental Verification of Microcrack Self-Healing Efficiency of Bitumen Composites Using Microcapsules

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

Preparation and properties of a novel rejuvenator-loaded fiber for asphalt pavement

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