scholarly journals Technology of self-healing road pavements: current status and development prospects

Vestnik MGSU ◽  
2020 ◽  
pp. 1407-1424
Author(s):  
Sergei S. Inozemtcev ◽  
Do Toan Trong
Keyword(s):  
Asphalt Concrete ◽  
Structural Integrity ◽  
Healing Process ◽  
Structural Features ◽  
The Self ◽  
Structural Defects ◽  
Current Status ◽  
Self Healing ◽  
Russian Science ◽  
Properties Of Materials

Introduction. Presently, there exists no unified methodology that could control self-healing properties of materials due to the lack of criteria characterizing the ability of materials to respond to impacts and to cope with adverse effects produced on their properties or structure. All assessment methods applied to self-healing properties of materials are reduced to the calculation of the ratio of relative changes in the value of parameters to be measured. A “self-healing” material is a material capable of initiating liquidation of structural defects, so that the rate of this process could exceed the one of spontaneous propagation of defects, while the resistance of the new structure to operating loads is not lower than the initial one. Development of solutions, capable of implementing this principle, will ensure longer service lives of materials. Materials and methods. A set of general methods of logical research was applied. These methods are based on the theoretical analysis of process solutions presented in professional editions, information resources maintained by their developers and in mass media, patents, research articles and reports. Results. The self-healing technology is applicable to asphalt concrete with regard for its structural features and thermoplastic properties. Self-healing means restoration of the structural integrity of physical and chemical bonds by moistening crack surfaces, diffusion of molecules between them, and arbitrary dissipation of molecules to ensure reinforcement. Self-healing process uniformity is attainable by applying the technology of functional agent encapsulation so that it could be added to the mix along with other components at the stage of the asphalt concrete mix preparation. Conclusions. Existing technological solutions can generate capsules that contain the recovery agent in the amount of up to 90…94 % of the total volume. General requirements and quality standards that apply to self-healing materials, used in construction, must be developed to identify their efficiency depending on application conditions. Provisions of the adhesion theory can be applied to the self-healing technology in the course of its implementation. The study was funded by the grant from the Russian Science Foundation (Project No. 19-79-00262).

scholarly journals Indicators of the effectiveness of self-healing asphalt concrete

2019 ◽  
Vol 97 ◽  
pp. 02007
Author(s):  
Sergey Inozemtcev ◽  
Evgeniy Korolev
Keyword(s):  
Asphalt Concrete ◽  
Healing Rate ◽  
Healing Process ◽  
Condition Index ◽  
The Self ◽  
Self Healing ◽  
Pavement Condition ◽  
Process Indicators ◽  
Pavement Condition Index

In the article, indicators reflecting the degree of efficiency of the self-healing technology being developed are proposed the degree of restoration of the operational state of the structure (degree of self-healing); the speed of the process of restoring the operational state of the structure (self-healing rate); durability operational status after self-healing; timeliness of initiation of the self-healing process. Indicators of the effectiveness of self-healing technology are justified by using the Pavement Condition Index (PCI).

scholarly journals Application of GGBFS and Bentonite to Auto-Healing Cracks of Cement Paste

2018 ◽  
Vol 1 (1) ◽  
pp. 38 ◽  
Author(s):  
J J Ekaputri ◽  
M S Anam ◽  
Y Luan ◽  
C Fujiyama ◽  
N Chijiwa ◽  
...  
Keyword(s):  
Cement Paste ◽  
Surface Crack ◽  
Crack Width ◽  
Healing Process ◽  
Crack Depth ◽  
The Self ◽  
External Loading ◽  
Self Healing ◽  
Carbonation Reaction ◽  
Granulated Blast Furnace Slag

Cracks are caused by many factors. Shrinkage and external loading are the most common reason. It becomes a problem when the ingression of aggressive and harmful substance penetrates to the concrete gap. This problem reduces the durability of the structures. It is well known that self – healing of cracks significantly improves the durability of the concrete structure. This paper presents self-healing cracks of cement paste containing bentonite associated with ground granulated blast furnace slag. The self-healing properties were evaluated with four parameters: crack width on the surface, crack depth, tensile strength recovery, and flexural recovery. In combination with microscopic observation, a healing process over time is also performed. The results show that bentonite improves the healing properties, in terms of surface crack width and crack depth. On the other hand, GGBFS could also improve the healing process, in terms of crack depth, direst tensile recovery, and flexural stiffness recovery. Carbonation reaction is believed as the main mechanism, which contributes the self-healing process as well as the continuous hydration progress.

The effects of textile reinforcements on the protective properties of self-healing polymers intended for safety gloves

2020 ◽  
Vol 90 (17-18) ◽  
pp. 1974-1986
Author(s):  
Emilia Irzmańska ◽  
Anna Bacciarelli-Ulacha ◽  
Agnieszka Adamus-Włodarczyk ◽  
Anna Strąkowska
Keyword(s):  
Healing Process ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
Economic Loss ◽  
The Self ◽  
Raw Material ◽  
Protective Equipment ◽  
Self Healing ◽  
Hybrid Molecules ◽  
The Impact

In the environment where glove material is exposed to harmful chemicals, hazards related to faster penetration of dangerous substances into the glove interior may cause microdamage. One of the solutions to overcome this problem is to use the self-healing polymeric materials that can minimize economic loss and accidents in the workplace. The current work aims to present the impact of different types of textile reinforcement on the effectiveness and efficiency of the self-healing process of methyl vinyl silicone rubber containing hybrid molecules with an inorganic silsesquioxane intended for use on all-rubber gloves. Three knitted fabrics with a similar structure and differentiated raw material composition were selected: polyamide, cotton–polyamide, and cotton. Evaluation of the self-healing process of the elastomeric composite to personal protective equipment was performed. For this purpose the assessment of the surface morphology of materials has been performed before and after the self-healing process. The implementation of knitted fabric into the polymeric composite in the tested samples allowed us to obtain the best results in all tests. The studied composite samples exhibited an increased resistance to three types of damage: penetration, abrasion and puncture. The samples also underwent the self-healing processes and regeneration after a proper conditioning period. Thus, the obtained results confirmed the possibility of using tested elastomeric composites in the construction of protective gloves and showed an effectivity of the self-healing process for the long-term usage of that protective equipment.

Molecular dynamics simulation insight into the temperature dependence and healing mechanism of an intrinsic self-healing polyurethane elastomer

2020 ◽  
Vol 22 (31) ◽  
pp. 17620-17631
Author(s):  
Xianling Chen ◽  
Jing Zhu ◽  
Yanlong Luo ◽  
Jun Chen ◽  
Xiaofeng Ma ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrogen Bonds ◽  
Molecular Diffusion ◽  
Healing Process ◽  
The Self ◽  
Dynamics Simulation ◽  
Polyurethane Elastomer ◽  
Self Healing ◽  
Insight Into

The changes in the type and number of hydrogen bonds as well as the microscopic behavior of molecular diffusion in the self-healing process of polyurethane are revealed.

scholarly journals The Self-Healing Performance of Carbon-Based Nanomaterials Modified Asphalt Binders Based on Molecular Dynamics Simulations

2021 ◽  
Vol 7 ◽  
Author(s):  
Yan Gong ◽  
Jian Xu ◽  
Er-hu Yan ◽  
Jun-hua Cai
Keyword(s):  
Healing Process ◽  
Asphalt Binder ◽  
Mean Square Displacement ◽  
The Self ◽  
Asphalt Binders ◽  
Self Healing ◽  
Modified Asphalt ◽  
Healing Efficiency ◽  
Carbon Based Nanomaterials ◽  
Carbon Based

In this study, the molecular dynamics simulation was used to explore the effects of carbon-based nanomaterials as binder modifiers on self-healing capability of asphalt binder and to investigate the microscopic self-healing process of modified asphalt binders under different temperature. An asphalt average molecular structure model of PEN70 asphalt binder was constructed firstly. Further, three kinds of carbon-based nanomaterials were added at three different percentages ranging from 0.5 to 1.5% to the base binder to study their effects on the self-healing capability, including two carbon nanotubes (CNT1 and CNT2) and graphene nanoflakes. Combining with the three-dimensional (3D) microcrack model to simulate the asphalt self-healing process, the density analysis, relative concentration analysis along OZ direction, and mean square displacement analysis were performed to investigate the temperature sensitive self-healing characters. Results showed that the additions of CNTs were effective in enhancing the self-healing efficiency of the plain asphalt binder. By adding 0.5% CNT1 and 0.5% CNT2, about 652% and 230% of the mean square displacement of plain asphalt binder were enhanced at the optimal temperatures. However, the use of graphene nanoflakes as an asphalt modifier did not provide any noticeable changes on the self-healing efficiency. It can be found that the self-healing capability of the asphalt was closely related to the temperature. For base asphalt, the self-healing effect became especially high at the phase transition temperature range, while, for the modified asphalt, the enhancement of the self-healing capability at the low phase transition temperature (15°C) became negligible. In general, the optimal healing temperature range of the CNTs modified asphalt binders is determined as 45–55°C and the optimal dosage of the CNTs is about 0.5% over the total weight of the asphalt binder. Considering the effect of carbon-based nanomaterials on the self-healing properties, the recommended carbon-based nanomaterials modifier is CNT1 with the aspect ratio of 1.81.

scholarly journals A Self-Healing Coating with UV-Shielding Property

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 421 ◽  
Author(s):  
Lei Peng ◽  
Musong Lin ◽  
Sheng Zhang ◽  
Li Li ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Moisture Absorption ◽  
Healing Process ◽  
Ultra Violet ◽  
The Self ◽  
Self Healing ◽  
Soft Substrate ◽  
Water Contact ◽  
Uv Shielding ◽  
Host Guest Complex ◽  
Healing Property

A self-healing coating with UV-shielding property was prepared in this paper. The self-healing property was based on the inclusion between a host (β-CD-TiO2) and a guest HEMA-Ad). After inclusion of the host and guest, the host–guest complex (HEMA-Ad/β-CD-TiO2) was polymerized with other reactive monomers (HEMA and BA) to obtain the final coating. The coating had good hydrophobicity (water contact angle >90°, moisture absorption rate <2%) and excellent UV-shielding performance (ultra-violet protect factor >90%), and could be firmly bonded to a soft substrate. In addition, the coating had good self-healing property, which means that cracks in the material can recover many times after being damaged and that the UV-shielding ability can be fully restored with the self-healing process.

A selected bacterial strain for the self-healing process in cementitious specimens without cell immobilization steps

2020 ◽  
Author(s):  
Romario P. Santos ◽  
Tatiane M. Ramos ◽  
Brendo M. Borges ◽  
Luciana M. Hollanda ◽  
Álvaro S. Lima ◽  
...  
Keyword(s):  
Bacterial Strain ◽  
Healing Process ◽  
Cell Immobilization ◽  
The Self ◽  
Self Healing

scholarly journals Biological Self-Healing of Cement Paste and Mortar by Non-Ureolytic Bacteria Encapsulated in Alginate Hydrogel Capsules

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3711
Author(s):  
Mohammad Fahimizadeh ◽  
Ayesha Diane Abeyratne ◽  
Lee Sui Mae ◽  
R. K. Raman Singh ◽  
Pooria Pasbakhsh
Keyword(s):  
Cement Paste ◽  
Healing Process ◽  
Cementitious Materials ◽  
The Self ◽  
Self Healing ◽  
Alkaline Conditions ◽  
Healing Agent ◽  
Encapsulated Bacteria ◽  
The Right

Crack formation in concrete is one of the main reasons for concrete degradation. Calcium alginate capsules containing biological self-healing agents for cementitious materials were studied for the self-healing of cement paste and mortars through in vitro characterizations such as healing agent survivability and retention, material stability, and biomineralization, followed by in situ self-healing observation in pre-cracked cement paste and mortar specimens. Our results showed that bacterial spores fully survived the encapsulation process and would not leach out during cement mixing. Encapsulated bacteria precipitated CaCO3 when exposed to water, oxygen, and calcium under alkaline conditions by releasing CO32− ions into the cement environment. Capsule rupture is not required for the initiation of the healing process, but exposure to the right conditions are. After 56 days of wet–dry cycles, the capsules resulted in flexural strength regain as high as 39.6% for the cement mortar and 32.5% for the cement paste specimens. Full crack closure was observed at 28 days for cement mortars with the healing agents. The self-healing system acted as a biological CO32− pump that can keep the bio-agents retained, protected, and active for up to 56 days of wet-dry incubation. This promising self-healing strategy requires further research and optimization.

Spatial resolution comparison of AC-SECM with SECM and their characterization of self-healing performance of hexamethylene diisocyanate trimer microcapsule coatings

2015 ◽  
Vol 3 (10) ◽  
pp. 5599-5607 ◽  
Author(s):  
Wei Wang ◽  
Likun Xu ◽  
Huyuan Sun ◽  
Xiangbo Li ◽  
Shouhuan Zhao ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Spatial Resolution ◽  
Healing Process ◽  
The Self ◽  
Hexamethylene Diisocyanate ◽  
Self Healing ◽  
Functional Additives

ACSECM monitored the self-healing process of scratched epoxy resin coatings with hexamethylene diisocyanate trimer microcapsules as functional additives.

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