Contribution to study of the self-healing effect activated by crystalline catalysts in concrete structures when subjected to continuous exposure to water

2012 ◽  
pp. 530-531
Keyword(s):  
Concrete Structures ◽  
The Self ◽  
Continuous Exposure ◽  
Self Healing ◽  
Healing Effect

Self-Healing Effect Caused by Accelerated Carbonation of Thermally Damaged Cement Mortar: Changes in Microstructural and Macroscopic Properties

2014 ◽  
Vol 529 ◽  
pp. 36-40
Author(s):  
Son Tung Pham ◽  
William Prince
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Cement Mortar ◽  
Nitrogen Adsorption ◽  
The Self ◽  
Size Distributions ◽  
Self Healing ◽  
Accelerated Carbonation ◽  
Healing Effect ◽  
Macroscopic Properties

The objective of this work was to examine the influence of accelerated carbonation on the microstructural and macroscopic properties of thermally damage cement mortar. A normalised CEM II mortar was treated at 500°C then submitted to carbonation at 20°C, 65% relative humidity and 20% of CO2 concentration. The pores size distributions were determined from nitrogen adsorption. We also followed changes in electrical resistivity and ultrasonic velocity. The results showed that losses of macroscopic properties caused by cracks appeared at high temperature were restored due to carbonation. This highlighted the self-healing effect by accelerated carbonation which allowed the thermally damaged mortar to recover its initial properties.

scholarly journals Investigating the Self-Healing of Dynamic Covalent Thermoset Polyimine and Its Nanocomposites

2019 ◽  
Vol 86 (10) ◽  
Author(s):  
Chuanqian Shi ◽  
Zhanan Zou ◽  
Zepeng Lei ◽  
Xingli Wu ◽  
Zhengwei Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Shear Strength ◽  
Environmental Pollution ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
The Self ◽  
Self Healing ◽  
Dynamic Covalent Chemistry ◽  
Healing Effect ◽  
Press Time

Self-healable and recyclable materials and electronics can improve the reliability and repairability and can reduce environmental pollution; therefore, they promise very broad applications. In this study, we investigated the self-healing performance of dynamic covalent thermoset polyimine and its nanocomposites based on the dynamic covalent chemistry. Heat press was applied to two laminating films of polyimine and its nanocomposites to induce self-healing. The effects of heat press time, temperature, and load on the interfacial shear strength of the rehealed films were investigated. The results showed that increasing the heat press time, temperature, and load can significantly improve the interfacial shear strength and thus the self-healing effect. For polyimine nanocomposites, increasing the heat press time, temperature, and load led to the improved electrical conductivity of the rehealed films.

Experimental Research on the Self-Healing Performance of Micro-Cracks in Concrete Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 28-32 ◽  
Author(s):  
Ling Sun ◽  
Wen Yong Yu ◽  
Qi Ge
Keyword(s):  
Crack Width ◽  
Crack Surface ◽  
The Self ◽  
Strength Analysis ◽  
Self Healing ◽  
Healing Effect ◽  
Concrete Crack ◽  
Micro Cracks ◽  
Before And After ◽  
Capillary Tension

Hollow glass fiber with full of repair agent is embedded in concrete to repair components, and one - third point loading experiment is carried out to test the mechanical properties of it. Based on the strength analysis of specimens before and after self – healing, the self – healing effect of concrete is evaluated. By simulating the closed heal agent flowing and penetrating into the concrete crack surface under the capillary tension, the influence of crack width to the healing effect is analyzed.

scholarly journals The influence of asphalt ageing on induction healing effect on porous asphalt concrete

2019 ◽  
Vol 3 ◽  
pp. 98-103 ◽  
Author(s):  
Shi Xu ◽  
Xueyan Liu ◽  
Amir Tabaković ◽  
Erik Schlangen
Keyword(s):  
Asphalt Concrete ◽  
Induction Machine ◽  
The Self ◽  
Electromagnetic Current ◽  
Self Healing ◽  
Porous Asphalt ◽  
Healing Effect ◽  
Healing Efficiency ◽  
Concrete Mix ◽  
Porous Asphalt Concrete

Induction healing is a proven technology which is able to improve the self-healing capacity of asphalt concrete. Healing is achieved via electromagnetic current produced by passing induction machine, where steel asphalt constituents heat up which in turn soften the bitumen in the asphalt layer, allowing it to flow and close cracks, repairing the damage. This paper reports on the study which investigated the influence of ageing on the healing capacity of Porous Asphalt (PA) concrete. Porous Asphalt concrete mix was prepared first,  then subjected to an accelerated (laboratory) ageing process using a ventilated oven. In order to further evaluate the induction healing efficiency of asphalt concrete,  Semi-circular bending (SCB) and healing cycles were performed on asphalt concrete specimens. The results show that with an increase of the ageing level of porous asphalt concrete, the induction healing efficiency decreases.

Self-Healing of Wind Turbine Blades by Pressurized Delivery of Healing Agent

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Rulin Shen ◽  
Meijian Ren ◽  
Ryoichi S. Amano ◽  
Mingjun Long ◽  
Yanling Gong
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
The Self ◽  
Peristaltic Pump ◽  
Self Healing ◽  
Wind Turbine Blades ◽  
Healing Effect ◽  
Healing Agent

Abstract Self-healing is a promising way to solve the difficulty in wind turbine blades repair, yet the embedded healing agent may have a disadvantage because of being exposed to outdoor for a long time. Pressurized delivery of the healing agent in real-time when the blade is damaged may be the solution to avoid the disadvantage healing agent. In this paper, the healing agent was pumped to the damaged area by a peristaltic pump, and the healing effect was evaluated by the recovery rate of the residual flexural strength after impact and the image of ultrasonic C-scan. To evaluate the healing effect of different damage degrees, 10 J, 15 J, 20 J, and 25 J impact energies were applied. The fluid tracer test showed that the healing agent could penetrate in the damaged areas after the impact of 15 J, 20 J and 25 J, while the three-point bending test revealed that the healing efficiency was the highest with 20 J (85.2%). The ultrasonic C-scan and optical photos of the sample showed that the images of the healing area were almost consistent with those of the un-impacted area, indicating that the damaged area is healed well. Based on the success of plate samples, the self-healing of the wind turbine blade-scale prototype was then carried out. Twenty-joule impact was exerted on the blade prototype, and the healing agent was pumped to the damaged area using the peristaltic pump similar to the same procedure as that of the plate specimen. Ultrasonic C-scan and optical images of the damaged area showed that the prototype was healed well in comparison with those of the plate specimens, indicating that the application of pressurized delivery of the healing agent system in the self-healing of wind turbine blade prototype was successful.

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