scholarly journals Curable Area Substantiation of Self-Healing in Concrete Using Neutral Axis

2019 ◽  
Vol 9 (8) ◽  
pp. 1537 ◽  
Author(s):  
Choonghyun Kang ◽  
Taewan Kim
Keyword(s):  
Neutral Axis ◽  
The Self ◽  
Strain Gauges ◽  
Self Healing ◽  
Distinct Area ◽  
Before And After ◽  
Strength And Stiffness ◽  
Underlying Mechanisms ◽  
Healing Assessment ◽  
Physical Recovery

The self-healing nature of concrete has been proved in many studies using various methods. However, the underlying mechanisms and the distinct area of self-healing have not been identified in detail. This study focuses on the limits of the area of self-healing. A bending specimen with a notch is used herein, and its flexural strength and stiffness before and after healing are compared and used for self-healing assessment. In addition, the neutral axis of the specimen was measured using successive strain gauges attached to the crack propagation part. Although the strength and stiffness of the concrete recovered after self-healing, the change in the location of the neutral axis before and after healing was insignificant, which indicates that physical recovery did not occur for once-opened crack areas.

Influence of Cement Coarse Particle on the Self-Healing Ability of Concrete Based on Ultrasonic Method

2010 ◽  
Vol 177 ◽  
pp. 526-529 ◽  
Author(s):  
Zhi Qiang Li ◽  
Zong Hui Zhou ◽  
Dong Yu Xu ◽  
Jing Hua Yu
Keyword(s):  
Particle Size ◽  
Wave Amplitude ◽  
Ultrasonic Method ◽  
The Self ◽  
Experimental Results ◽  
Coarse Particle ◽  
Head Wave ◽  
Self Healing ◽  
Before And After ◽  
The Relationship

The influences of particle size and mixing content of coarse cement on the self-healing ability of concrete were researched by ultrasonic method. Damaged degree was measured through the decrease of ultrasonic head wave amplitude (UHA) before and after loading. The relationship between damaged degree and self-healing ratio of concrete was built based on the experimental results as well as the relationship between cement diameter and self-healing ratio of concrete. Analyzing results show that UHA can evaluate the damaged degree of concrete clearly. There exists a damaged threshold of the concrete during loading. Under the same mixing content of coarse cement, when the damaged degree is higher than the threshold, the self-healing ratio of concrete decreases with the increase of damaged degree and increases with the increase of coarse cement diameter, however, while the damaged degree is less than the threshold, the self-healing ratio of concrete increases with both the increase of damaged degree and coarse cement diameter.

scholarly journals Cell Biological Techniques and Cell-Biomaterial Interactions

Cells ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2094
Author(s):  
Yunqing Kang
Keyword(s):  
Tissue Engineering ◽  
Regenerative Medicine ◽  
The Body ◽  
The Self ◽  
Self Healing ◽  
Special Issue ◽  
Underlying Mechanisms

Biomaterials play a key role in modern tissue engineering and regenerative medicine. They are expected to take over the function of a damaged tissue in the long term, trigger the self-healing potential of the body, and biodegrade at an appropriate rate. To meet these requirements, it is imperative to understand the cell-biomaterial interactions and develop new cell biotechnologies. The collection of this Special Issue brings together a number of studies portraying the underlying mechanisms of cell-biomaterial interactions.

scholarly journals Evaluation of Self-Healing Performance of PE and PVA Concrete Using Flexural Test

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Choonghyun Kang ◽  
Jungwon Huh ◽  
Quang Huy Tran ◽  
Kiseok Kwak
Keyword(s):  
Water Environment ◽  
The Self ◽  
Bending Test ◽  
Self Healing ◽  
Recovery Effect ◽  
Three Point Bending ◽  
Strength Recovery ◽  
Before And After ◽  
Healing Environments ◽  
Pva Fiber

The self-healing performance of PE and PVA concrete was evaluated, by using the three-point bending test with a notch. Four different crack inducement days were applied (7, 28, 49, and 91 days), and the same 21 days of healing period were applied to each case. The self-healing environments were in 20°C water, and in the curing room with 20°C temperature and 60% humidity. The flexural strength and the initial flexural stiffness of before and after healing were compared. As a result, both the strength recovery effect and the stiffness recovery effect decreased with the delay of crack inducement, and specimens in the water environment showed higher healing effect than those in the air environment. PVA fiber showed a relatively greater recovery effect than PE fiber.

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 Thermo-Responsive Self-Healing Polycaprolactone Urethane Coatings from Waste Palm Cooking Oil

2019 ◽  
Vol 8 (6) ◽  
pp. 3376-3381
Keyword(s):  
Mechanical Analysis ◽  
The Self ◽  
Self Healing ◽  
Polyurethane Coating ◽  
Stimuli Responsive ◽  
Responsive Polymers ◽  
Cooking Oil ◽  
Before And After ◽  
Thermal Stimuli ◽  
Scanning Electron

The evolution of responsive polymers has amplified expressively in consequence of the growth of precise polymer architecture with predetermined structure-to-property behavior. In this study, new thermal responsive self-healing polycaprolactone urethane coatings were prepared from waste palm cooking oil. Nine different formulations of coatings with various percentages of ε-caprolactone (ε-CL) were successfully developed and the effect of polycaprolactone network in the polyurethane coating on the self-healing behavior. The remendability of the coatings was studied by using thermal analysis and dynamic mechanical analysis. The PCLU coating with the highest content of PCL network was nearly completely healed after 2 hours at 90ºC. The results were confirmed by scanning electron microscopy before and after healing. The mechanism of scratch closure by thermal stimuli-responsive self-healing was also discussed.

Influence of Slag and Fly Ash on the Self-Healing Ability of Concrete

2011 ◽  
Vol 306-307 ◽  
pp. 1020-1023 ◽  
Author(s):  
Zong Hui Zhou ◽  
Zhi Qiang Li ◽  
Dong Yu Xu ◽  
Jing Hua Yu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sem Analysis ◽  
The Self ◽  
Self Healing ◽  
Strength Measurement ◽  
Before And After ◽  
Optimal Mixing

The influence of slag and fly ash on the self-healing ability of concrete was researched by strength measurement and SEM analysis. The self-healing ratio was measured by the increase of compressive strength before and after self-healing. The optimal mixing amount of slag and fly ash were determined, and the reasonable sand ratio was obtained. Analyzing results show that the self-healing ability of concrete was the strongest when the mixing content of slag and fly ash were 30% and 40% respectively. The appropriate sand ratio was also obtained, when the sand ratio is 33%, the self-healing ability of concrete is the strongest.

scholarly journals Psychometric Properties of the Self-Healing Assessment Scale for Community-Dwelling Older Adults

Healthcare ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 484
Author(s):  
Yi-Chen Wu ◽  
Hua-I Hsu ◽  
Heng-Hsin Tung ◽  
Shi-Jun Pan ◽  
Shu-Wei Lin
Keyword(s):  
Older Adults ◽  
Convergent Validity ◽  
Reliability And Validity ◽  
Community Dwelling ◽  
The Self ◽  
Assessment Scale ◽  
Self Healing ◽  
Validity Indices ◽  
Healing Assessment ◽  
Community Dwelling Older Adults

Self-healing, an intrinsic healing capacity, helps individuals’ bodies and minds to regain wholeness and is significant in the pursuit of one’s own healthy ageing and independence. This study was intended to develop and preliminarily test the reliability and validity of the self-healing assessment scale (SHAS) for community-dwelling older adults, and was conducted in three phases. Phase 1: The definitions of self-healing were synthesized from our knowledge of the literature regarding the ontology of self-healing and panels of 25 experts. The initial version of the 12-item questionnaire was developed by the in-depth interviews of focus groups and panels, and the content was validated by six experts. Phase 2: A cross-sectional survey, including a total of 500 community-dwelling older adults with a mean age of 71.76, was then conducted for the preliminary reliability and validity test. The content validity indices were satisfied. Twelve items were retained, and three factors were identified, namely, physical and mental state, socioeconomic and environmental status, and independent lifestyle, which explained 65.8% of the variance under explorative approval. Phase 3: the standardized factor above 60 obtained by confirmatory factorial analysis indicated good convergent validity. The relationship between self-healing and health-related quality of life was confirmed via concurrent validity testing. The SHAS can facilitate the evaluation of factors associated with community-dwelling older adults’ self-healing capacity. Programs tailored to enhance self-healing capacity should be designed, implemented, and inspected regarding their effectiveness in older adults.

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