The Properties of Different Healing Agents Considering the Micro-Self-Healing Process of Asphalt with Encapsulations

Shu, Benan; Zhou, Min; Yang, Tiantian; Li, Yongling; Ma, Yunlong; Liu, Kai; Bao, Shiwen; Barbieri, Diego Maria; Wu, Shaopeng

doi:10.3390/ma14010016

Cited by 16 publications

(3 citation statements)

References 34 publications

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“…According to the reference [38], fatigue test with the time sweep mode was performed to study the effect of MCA on antifatigue damage of WRMA. The loading strain and rate were 3% and 10 Hz, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder

Liu¹,

Wang³

et al. 2021

Materials

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Segregation of waste crumb rubber powder (WR) modified asphalt binders the large-scale application of WR in asphalt. The method of microwave activation combined with chemical activation (KMWR) was proposed to improve storage stability and rheological properties of WR modified asphalt in this work. Storage stability and rheological properties of virgin asphalt, MWR modified asphalt, and KMWR modified asphalt were comparatively studied by the standard segregation test, bending beam rheometer (BBR) test, and dynamic shear rheometer (DSR) test. The effect of composite activation on waste rubber powder particles was studied by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and Brunauer–Emmett–Teller (BET) tests. The main results showed that after the physical and chemical composite activation, the storage stability of waste rubber powder modified asphalt was significantly improved, WR modified asphalt had better crack resistance, better rutting resistance, and better fatigue performance. After physical and chemical activation, WR was desulfurized, and a large number of active groups was grafted on the WR particles.

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Section: Experimental Methodsmentioning

confidence: 99%

Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder

Liu¹,

Wang³

et al. 2021

Materials

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“…The thermally induced healing method heats the asphalt mixture with microwave or induction energy, therefore allowing the bitumen to flow to heal the crack [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. The embedded rejuvenator encapsulation method offers in situ rejuvenation at the cracking site; as such, the rejuvenated bitumen will regain the intrinsic healing capacity and gradually heal the crack driven by capillary flow [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Both methods have been demonstrated to not only improve the crack recovery in asphalt pavement but also increase its fatigue life [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Performance of a Hybrid Self-Healing System in Porous Asphalt under Fatigue Loadings

Liu

Tabaković

et al. 2021

Materials

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Self-healing asphalt, which is designed to achieve autonomic damage repair in asphalt pavement, offers a great life-extension prospect and therefore not only reduces pavement maintenance costs but also saves energy and reduces CO2 emissions. The combined asphalt self-healing system, incorporating both encapsulated rejuvenator and induction heating, can heal cracks with melted binder and aged binder rejuvenation, and the synergistic effect of the two technologies shows significant advantages in healing efficiency over the single self-healing method. This study explores the fatigue life extension prospect of the combined healing system in porous asphalt. To this aim, porous asphalt (PA) test specimens with various healing systems were prepared, including: (i) the capsule healing system, (ii) the induction healing system, (iii) the combined healing system and (iv) a reference system (without extrinsic healing). The fatigue properties of the PA samples were characterized by an indirect tensile fatigue test and a four-point bending fatigue test. Additionally, a 24-h rest period was designed to activate the built-in self-healing system(s) in the PA. Finally, a damaging and healing programme was employed to evaluate the fatigue damage healing efficiency of these systems. The results indicate that all these self-healing systems can extend the fatigue life of porous asphalt, while in the combined healing system, the gradual healing effect of the released rejuvenator from the capsules may contribute to a better induction healing effect in the damaging and healing cycles.

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“…Several methods of inducing self-healing in asphalt pavement design have been presented and critically analyzed concerning their functionality, design, and performance to prolong its service life [20]. Some of the methods of selfhealing, as proposed by Tabaković and Schlangen [17], are as follows:…”

Section: Introductionmentioning

confidence: 99%

A Review of Asphaltic Crack Healing Approaches and Its Mechanism

Ghazali

Hasan

Seman

et al. 2021

Advances in Materials Science and Engineering

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The concept of self-healing has an excellent potential to extend the life of asphalt pavement. This technology can be considered a sustainable technology due to its ability to reduce the utilization of asphalt mixture production materials used for road maintenance, polluting the environment. It is a complex physicochemical process wherein the molecular diffusion healing mechanisms in asphalt materials are inspired by self-healing polymeric systems, which describe the self-recovery behaviors based on polymer chain dynamics. Several methods have been adopted to improve the self-healing of asphalt, one of which is induction healing. It is the process of heating the asphalt pavement incorporated with an electrically conductive material such as steel fibers, wherein asphalt healing is undertaken via electric field induction. Induction healing via induction heating occurs with eddy current where the electric current flows within the conductive fibers when magnetically susceptible under the magnetic field. Microwave heating is another self-healing method similar to induction in which magnetic radiation is employed to treat asphalt mixtures instead of the electric field-induced induction healing processes. The conductive fibers can absorb the electromagnetic (EM) waves to convert them into heat energy through doublet polarization, interface polarization, and electrical conduction dissipation when placed in the microwave field. These two types of heating systems, which are induction heating and microwave heating, are compared and discussed thoroughly in this study. Finally, some recommendations for the future development of self-healing asphalt are proposed.

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The Properties of Different Healing Agents Considering the Micro-Self-Healing Process of Asphalt with Encapsulations

Cited by 16 publications

References 34 publications

Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder

Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder

Experimental Investigation of the Performance of a Hybrid Self-Healing System in Porous Asphalt under Fatigue Loadings

A Review of Asphaltic Crack Healing Approaches and Its Mechanism

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