Synthesis and characterization of multi-cavity Ca-alginate capsules used for self-healing in asphalt mixtures

Zhang, Lei; Liu, Quantao; Li, Hechuan; Norambuena-Contreras, José; Wu, Shaopeng; Bao, Shiwen; Shu, Benan

doi:10.1016/j.conbuildmat.2019.03.224

Cited by 70 publications

(17 citation statements)

References 29 publications

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“…Overall, the encapsulation of each oil rejuvenator resulted in capsules with homogeneous size as evidenced their low coefficient of variation (CV) in the histograms. Additionally, representative SEM images taken from the cross-sectional area of both biocapsules (Figure 5d-f) reveals that the rejuvenators were encapsulated in an internal polynuclear microstructure, also reported by Zhang et al [22] and Xu et al [23]. They hypothesise that a polynuclear internal microstructure can provide: (1) a controlled liberation of the rejuvenating agent, providing multiple healings on aged bitumen, and (2) good thermal and mechanical stability.…”

Section: Results and Discussion Influence Of The Rejuvenating Agents supporting

confidence: 74%

Synthesis and characterisation of biocapsules containing low-cost rejuvenators for asphalt self-healing

et al. 2021

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This study aimed to characterise polynuclear biocapsules containing low-cost rejuvenating agents for asphalt self-healing. Capsules consisted of a biopolymeric matrix of calcium alginate containing cooking oil and mineral oil as rejuvenating agents, being synthesised using ionic gelation through the pumping dripping technique. The physical-chemical properties of the oil-in-biopolymer emulsions and their stability over time were studied. The morphological and thermophysical properties of the biocapsules, as well as the encapsulation efficiency of the rejuvenating agents, were quantified and characterised by microscopic techniques and laboratory tests. Main results showed that emulsions should be used for encapsulation purposes within a period no longer than 3h, reducing the effect of instability phenomena. Besides, the biopolymer-based polynuclear capsules presented uniform size, internal multicavity microstructure resulting in high encapsulation efficiencies and thermal stability at high temperatures, proving that cooking oil and mineral oil can be potentially used as low-cost rejuvenating agents and thermally stable additives for asphalt self-healing purposes.

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Section: Results and Discussion Influence Of The Rejuvenating Agents supporting

confidence: 74%

Synthesis and characterisation of biocapsules containing low-cost rejuvenators for asphalt self-healing

et al. 2021

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“…There are two main advantages of these multi-cavity elements. They present a better structural reinforcement, which allows for their integrity during asphalt manufacturing processes, and the beads do not release all of the rejuvenator when the first crack reaches due to their compartmented structure, so they provide multiple crack-healing and long-term healing [ 23 , 149 ]. Finally, recent research efforts have paid special attention to the development of encapsulated fibers [ 129 , 150 , 151 , 152 , 153 ].…”

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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“…This type of capsules has the advantages of large coating volume, high healing efficiency, long-lasting healing action, stress-controlled release, and regeneration of aged asphalt. As demonstrated in recent studies, asphalt mixtures containing these capsules have superior self-healing behavior in the fracture energy recovery test as the fracture healing energy even reaches 180% [24]. Nevertheless, these conclusions are reached under ideal circumstances.…”

Section: Introductionmentioning

confidence: 82%

Effect of Ageing on Self-Healing Properties of Asphalt Concrete Containing Calcium Alginate/Attapulgite Composite Capsules

Liu

Wan

et al. 2022

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Calcium alginate capsules within asphalt concrete can gradually release interior asphalt rejuvenator under cyclic loading to repair micro cracks and rejuvenate aged asphalt in-situ. However, asphalt pavement will become aged due to environmental and traffic factors during the service period. In view of this, this paper investigated the effect of ageing on the healing properties of asphalt concrete containing calcium alginate/attapulgite composite capsules under cyclic loading. The capsules were fabricated using the orifice-bath method and the morphological structure, mechanical strength, thermal stability, oil release ratios and healing levels of capsules in fresh, short-term ageing and long-term ageing asphalt concrete were explored. The results indicated that the different ageing treatments would not damage the multi-chamber structure nor decrease the mechanical strength of capsules but would induce the capsules release oil prematurely. The premature oil released from capsules in turn can offset the ageing effect owing to ageing treatment. The short-term ageing and long-term ageing plain asphalt mixtures gained strength recovery ratios of 39.3% and 34.2% after 64,000 cycles of compression loading, while the strength recovery ratios of short-term ageing and long-term ageing asphalt mixtures containing capsules were 63.5% and 54.8%, respectively.

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Synthesis and characterization of multi-cavity Ca-alginate capsules used for self-healing in asphalt mixtures

Cited by 70 publications

References 29 publications

Synthesis and characterisation of biocapsules containing low-cost rejuvenators for asphalt self-healing

Synthesis and characterisation of biocapsules containing low-cost rejuvenators for asphalt self-healing

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

Effect of Ageing on Self-Healing Properties of Asphalt Concrete Containing Calcium Alginate/Attapulgite Composite Capsules

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