Effect of mixing and ageing on the mechanical and self-healing properties of asphalt mixtures containing polymeric capsules

Norambuena-Contreras, José; Yalçın, Erkut; García, Álvaro; Al-Mansoori, T.; Yılmaz, Mehmet; Hudson-Griffiths, Robin

doi:10.1016/j.conbuildmat.2018.04.153

Cited by 86 publications

(56 citation statements)

References 19 publications

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“…Bio-oil capsules were prepared by the cross-linking of sodium alginate (C 6 H 7 O 6 Na) in the presence of Ca 2+ ions through an external ionic gelation process [13], as shown in Figure 2. The preparation consisted of 5 steps, as follows: (1) sodium alginate was added to deionized water and mechanically stirred (Model OS40-Pro -LB Pro) at 700 rpm for 30 min, until its complete solution.…”

Section: Preparation Of Bio-based Capsules Containing Liquefied Bio-oilmentioning

confidence: 99%

“…Several authors have successfully synthesized and proven the use of numerous encapsulated rejuvenating agents, such as dense aromatic oil [11], waste cooking oil [12], and sunflower-cooking oil [13] with asphalt self-healing purposes. Encapsulation procedures, such as in-situ polymerization and ionic gelation, have mainly been used to produce core-shell and polynuclear (beads) encapsulated rejuvenators with size ranges of 5-153 µm and 2-7 mm, respectively [11][12][13][14][15][16]. Recently, bio-oil (BO) has been introduced by Zhang et al [17] as a sustainable rejuvenating agent for aged asphalt binder.…”

Section: Introductionmentioning

confidence: 99%

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Microencapsulated Bio-Based Rejuvenators for the Self-Healing of Bituminous Materials

et al. 2020

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Asphalt self-healing by encapsulated rejuvenating agents is considered a revolutionary technology for the autonomic crack-healing of aged asphalt pavements. This paper aims to explore the use of Bio-Oil (BO) obtained from liquefied agricultural biomass waste as a bio-based encapsulated rejuvenating agent for self-healing of bituminous materials. Novel BO capsules were synthesized using two simple dripping methods through dropping funnel and syringe pump devices, where the BO agent was microencapsulated by external ionic gelation in a biopolymer matrix of sodium alginate. Size, surface aspect, and elemental composition of the BO capsules were characterized by optical and scanning electron microscopy and energy-dispersive X-ray spectroscopy. Thermal stability and chemical properties of BO capsules and their components were assessed through thermogravimetric analysis (TGA-DTG) and Fourier-Transform Infrared spectroscopy (FTIR-ATR). The mechanical behavior of the capsules was evaluated by compressive and low-load micro-indentation tests. The self-healing efficiency over time of BO as a rejuvenating agent in cracked bitumen samples was quantified by fluorescence microscopy. Main results showed that the BO capsules presented an adequate morphology for the asphalt self-healing application, with good thermal stability and physical-chemical properties. It was also proven that the BO can diffuse in the bitumen reducing the viscosity and consequently self-healing the open microcracks.

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Section: Preparation Of Bio-based Capsules Containing Liquefied Bio-oilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microencapsulated Bio-Based Rejuvenators for the Self-Healing of Bituminous Materials

et al. 2020

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“…Therefore, researchers focus attention on the crack monitoring and asphalt repairing. In 2018, Norambuena‐Contreras et al designed a damage‐reporting and self‐healing microcapsule by polymeric calcium alginate for asphalt, and further experiments were taken to test mechanical and self‐healing properties of the asphalt structures with different mixing orders and ageing conditions ( Figure a,b). As shown in Figure c,d, the microcapsules show a good dispersion in the specimen, with some cracked capsules that ruptured in the mixing and compaction processes.…”

Section: Applications In Shmmentioning

confidence: 99%

“…As shown in Figure c,d, the microcapsules show a good dispersion in the specimen, with some cracked capsules that ruptured in the mixing and compaction processes. And the physical, high/low‐temperature, workability, anti‐aging, and mechanical properties of the asphalt samples with capsules were all evaluated . The effect of ageing time and mixing order on the asphalt specimen with or without microcapsules was investigated by stiffness modulus and flexural strength tests.…”

Section: Applications In Shmmentioning

confidence: 99%

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Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Zheng

Wang

et al. 2019

Adv Materials Technologies

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The smart sensor is an effective way to detect damage and improve structural safety in structural health monitoring. Microcapsule‐based visualization sensors stand out from the smart sensors. Here, the research progress of microcapsule visualization materials in recent years is summarized and the sensing principles, influence factors, performances, applications, and future prospects are introduced. The way to achieve the visualizing function of microcapsule visualization sensors is the fabrication of microcapsules that are encapsulated with solutions of dyes or indicator. When the protective shell of microcapsules is broken, the dyes will be released and activated under optical, chemical, or mechanical conditions. These visualized microcapsules can be added to the interior of the structure or prepared as a coating to provide structural health monitoring of the interior and surface of the structure. They can accurately detect microcracks and highlight them in bright colors. Additionally, the structural health monitoring applications of microcapsule visualization sensing coatings in concrete, asphalt, and steel are presented with detailed examples. The development and application of these microcapsule visualization sensors are of great significance in improving the structural life and avoiding structural failure in engineering.

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Synthesis of dual physical self‐healing starch‐based hydrogels for repairing tissue defects

Shahriari

Abdouss

Hadjizadeh

2023

Polymer Engineering & Sci

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Hydrogels have the potential to simulate and permeate body tissues. They can be used in many biomedical applications, such as drug delivery, wound dressings, contact lenses, synthetic implants, biosensors, and tissue engineering. Despite recent significant advances in hydrogel fabrication, with the introduction of double network hydrogels, with ionic or hydrogen bonds, there is still the challenge of achieving optimal mechanical properties with appropriate self-healing ability. To solve the above problem, in this study, a new type of starch/chitosan/PVA/borax hydrogel was synthesized by adopting the one-pot method. The effect of concentration and ratio of raw materials on the final properties of hydrogels, such as the degree of hydrophilicity, morphology, degradation, mechanical strength, and drug release rate, was investigated. The properties of hydrogels were examined by scanning electron microscopy, thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray diffractometry, and contact angle, which confirmed the composite synthesis and uniform distribution of HNT and curcumin. In addition, the composite hydrogel showed excellent mechanical properties. Drug release studies confirmed that the drug is slowly released from the nanocomposite hydrogels. The results showed that starch-based nanocomposite hydrogels could provide appropriate repairing potential for defects exposed to changeable parameters.

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Effect of mixing and ageing on the mechanical and self-healing properties of asphalt mixtures containing polymeric capsules

Cited by 86 publications

References 19 publications

Microencapsulated Bio-Based Rejuvenators for the Self-Healing of Bituminous Materials

Microencapsulated Bio-Based Rejuvenators for the Self-Healing of Bituminous Materials

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Synthesis of dual physical self‐healing starch‐based hydrogels for repairing tissue defects

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