scholarly journals Chemical Analysis of Silica Fume Infused Self Healing Concrete

2020 ◽  
Vol 8 (6) ◽  
pp. 1430-1432
Keyword(s):  
Silica Fume ◽  
Thin Section ◽  
Healing Process ◽  
Xrd Analysis ◽  
Silica Content ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Self Healing ◽  
Healing Property ◽  
Thin Section Analysis

Self healing technique using mineral and chemical admixtures are gaining momentum nowadays. Admixtures like silica fume, marble dust, fly ash, ground granulated blast furnace slag, limestone powder are being experimented nowadays as self healing agents. In this experimental examination, silica fume has been used as a healing agent (12.5% replacement). Cracks were induced and the specimens were subjected to continuous water exposure for 28 days. After 28 days, the specimens were tested for healing effect and the healing products were chemically analyzed by means of FESEM analysis, EDAX, thin section test and XRD analysis. From FESEM and EDAX analysis, for silica fume mix, portlandite formation was evident. Thin section analysis showed the morphology of anorthite feldspar. XRD analysis showed that excess silica content in silica fume actively involved in faster healing process resulting in the formation of calcite, calcium hydroxide and calcium carbonate. All the test results indicated that self healing property can be achieved using silica fume as mineral admixture. In addition to the healing property, incorporating silica fume reduces the consumption of cement, thereby reducing the air pollution caused by the cement industries as well as resulting in the production of eco-friendly concrete.

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.

scholarly journals Investigations of Self-Healing Property of Chitosan-Reinforced Epoxy Dye Composite Coatings

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hüsnügül Yılmaz Atay ◽  
Leyla Eral Doğan ◽  
Erdal Çelik
Keyword(s):  
Composite Coatings ◽  
Healing Process ◽  
Primary Objective ◽  
The Self ◽  
Self Healing ◽  
Application Range ◽  
Glass Substrates ◽  
Different Types ◽  
Healing Property ◽  
Different Parts

Chitosan has a very wide application range in different parts of life such as in biomedical and antimicrobial areas. In recent years the self-healing property of chitosan becomes more of an issue. In the study chitosan was used to obtain a self-healing composite material. An epoxy dye was converted to a self-healing coating. Different types of samples were prepared by coating the glass substrates with a polymer matrix reinforced with various amounts of chitosan. The samples were characterized by fourier transform Infrared (FTIR) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). In addition, self-healing test was applied as a primary objective of this research. In this respect, the samples were scratched with a very thin pin, and they were analyzed by SEM periodically. It was observed that chitosan-reinforced dyes showed self-healing property. Mechanism of the self-healing process was also scrutinized.

scholarly journals Influence of Mineral Additives on the Efflorescence of Ettringite-Rich Systems

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5464
Author(s):  
Linglin Xu ◽  
Siyu Liu ◽  
Peiming Wang ◽  
Zhenghong Yang
Keyword(s):  
Pore Structure ◽  
Silica Fume ◽  
Optical Microscope ◽  
Cementitious Materials ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Capillary Absorption ◽  
In Situ Raman Spectroscopy ◽  
Multi Scale ◽  
Mineral Additives

Efflorescence is aesthetically undesirable to all cementitious materials products and mainly results from the carbonation of hydrates and salt precipitation. Alternative binders without portlandite formation theoretically have much lower efflorescence risk, but in practice, the efflorescence of ettringite-rich systems is still serious. This study reports the impacts of mineral additives on the efflorescence of ettringite-rich systems and the corresponding microstructural evolution. The effects of silica fume, limestone powder, and diatomite on efflorescence and the capillary pore structure of mortars were investigated from a multi-scale analysis. The composition and microstructure of efflorescent phases were revealed by optical microscope (O.M.), in-situ Raman spectroscopy, and Scanning Electron Microscopy (SEM). Results indicate that the addition of mineral additives can efficiently inhibit the efflorescence of reference, especially with silica fume. Similar to the ettringite-rich system, the efflorescence substances of all modifies are composed of ettringite and CaCO3, indicating that the addition of mineral admixture does not lead to chemical reactions, lower capillary absorption coefficient of mineral additives modified specimen, the denser pore structure and the lower efflorescence degree.

scholarly journals Characterization of Steel Slag Filler and Its Effect on Aging Resistance of Asphalt Mastic with Various Aging Methods

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 869
Author(s):  
Minghua Wei ◽  
Shaopeng Wu ◽  
Haiqin Xu ◽  
Hechuan Li ◽  
Chao Yang
Keyword(s):  
Particle Size ◽  
Surface Characterization ◽  
Steel Slag ◽  
Self Healing ◽  
Limestone Filler ◽  
Asphalt Mastic ◽  
Pore Characterization ◽  
Asphalt Mastics ◽  
Healing Property

Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag. The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods. Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared. Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated. Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers. The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially. In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics. In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic.

scholarly journals Injectable Self-Healing Adhesive pH-Responsive Hydrogels Accelerate Gastric Hemostasis and Wound Healing

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jiahui He ◽  
Zixi Zhang ◽  
Yutong Yang ◽  
Fenggang Ren ◽  
Jipeng Li ◽  
...  
Keyword(s):  
Wound Healing ◽  
Endoscopic Treatment ◽  
Healing Process ◽  
Gelation Time ◽  
Type I ◽  
Self Healing ◽  
Ph Responsive ◽  
Gastric Hemorrhage ◽  
Wound Model ◽  
Arterial Bleeding

AbstractEndoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) are well-established therapeutics for gastrointestinal neoplasias, but complications after EMR/ESD, including bleeding and perforation, result in additional treatment morbidity and even threaten the lives of patients. Thus, designing biomaterials to treat gastric bleeding and wound healing after endoscopic treatment is highly desired and remains a challenge. Herein, a series of injectable pH-responsive self-healing adhesive hydrogels based on acryloyl-6-aminocaproic acid (AA) and AA-g-N-hydroxysuccinimide (AA-NHS) were developed, and their great potential as endoscopic sprayable bioadhesive materials to efficiently stop hemorrhage and promote the wound healing process was further demonstrated in a swine gastric hemorrhage/wound model. The hydrogels showed a suitable gelation time, an autonomous and efficient self-healing capacity, hemostatic properties, and good biocompatibility. With the introduction of AA-NHS as a micro-cross-linker, the hydrogels exhibited enhanced adhesive strength. A swine gastric hemorrhage in vivo model demonstrated that the hydrogels showed good hemostatic performance by stopping acute arterial bleeding and preventing delayed bleeding. A gastric wound model indicated that the hydrogels showed excellent treatment effects with significantly enhanced wound healing with type I collagen deposition, α-SMA expression, and blood vessel formation. These injectable self-healing adhesive hydrogels exhibited great potential to treat gastric wounds after endoscopic treatment.

Iron (III) cross-linked thermoplastic nitrile butadiene elastomer with temperature-adaptable self-healing property

2021 ◽  
Vol 28 (3) ◽  
Author(s):  
Chenghao Dai ◽  
Xijuan Cao ◽  
Kai Gou ◽  
Qiyan Yin ◽  
Binjie Du ◽  
...  
Keyword(s):  
Self Healing ◽  
Healing Property
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