scholarly journals The Synergy of Electrochemistry and Concrete Material Science in Evaluating Corrosion Resistance of Wastes-Containing Reinforced Cement-Based Systems

10.5772/20791 ◽  
2011 ◽  
Author(s):  
D. A. ◽  
K. van
Keyword(s):  
Corrosion Resistance ◽  
Material Science ◽  
Concrete Material ◽  
Reinforced Cement

scholarly journals Research on RCC and Timber Multi-Storey Structures using Response Spectrum Search

2019 ◽  
Vol 8 (2S3) ◽  
pp. 499-503
Keyword(s):  
Response Spectrum ◽  
Bending Moment ◽  
Timber Structures ◽  
Response Spectrum Analysis ◽  
Concrete Material ◽  
Alternative Material ◽  
Reinforced Cement ◽  
Proper Design ◽  
Substitute Material ◽  
Seismic Forces

The sustainability of Reinforced Cement Concrete material and its structures will play predominant role in creating environmental impacts. The alternative material for construction of multi-story structures is the need of hour. The substitute material should be compatible for construction as well as should sustained the seismic forces during earthquake. The substitute material taken is Timber, being an orthogonal in nature, behaves differently from RCC with respect to elastic and physical properties. Here, two geometrically identical multi-story structures are compared to find the seismic compatibility of timber structure as compared to RCC structure. Both the buildings were modelled in ETABS software using different material properties, viz. RCC and Timber, and were analysed using Response Spectrum Analysis. Different parameters were studied and compared for both the buildings like, shear force, bending moment, lateral story displacement and story shear. After analysis, it was concluded that timber structures can be built with lighter sections as that of RCC. And due to much more flexibility of Timber Structures, proper design of connections and their adequate strength is required to increase the stiffness of timber structures.

scholarly journals RESEARCH OF CHARACTERISTICS AND PROPERTIES OF PYROCARBON COATINGS

2018 ◽  
pp. 37-42
Author(s):  
K.V. Simeiko
Keyword(s):  
Corrosion Resistance ◽  
Material Science ◽  
Nuclear Reactors ◽  
Urgent Problem ◽  
High Radiation ◽  
Hydrocarbon Gases ◽  
Passive Protection ◽  
Coated Particles ◽  
Main Components ◽  
Fuel Elements

One of the variants of the projected nuclear reactors possessing increased passive protection are reactors with coated particles and spherical fuel elements, one of the main components of which is pyrocarbon. Pyrocarbon has a high radiation and corrosion resistance, therefore, the researches aimed at the disposal of radiation wastes are also promising, as the problem of radiation wastes disposal is urgent problem not only for Ukraine, but for the whole world. It should be noted that due to its unique properties, pyrocarbon can be used in various fields of science and industry. For several years, the Gas Institute of NASU conducted studies of the production of pyrocarbon coatings through the pyrolysis of hydrocarbon gases in reactors with electrothermal fluidized bed. In order to determine the possibility of using pyrocarbon coatings obtained by the Gas Institute of NAS of Ukraine, it is necessary to conduct studies of their material-science characteristics and properties. The article presents studies of the assessment of density, purity, corrosion resistance and microrelief of pyrocarbon coatings. Intermediate conclusions concerning the possibility of using the obtained pyrocarbon were made. Bibl.16, Fig. 2, Tab.1.

Application of Micro-Structure Testing in the Analysis of the Cause of Concrete Cracks

2014 ◽  
Vol 629-630 ◽  
pp. 121-129
Author(s):  
Chen Chun ◽  
Ya Mei Zhang ◽  
Rui Xing Wang ◽  
Jie Yang
Keyword(s):  
Material Science ◽  
Traditional Method ◽  
Thermo Gravimetric Analysis ◽  
New Method ◽  
Gravimetric Analysis ◽  
Micro Structure ◽  
Thermo Gravimetric ◽  
Concrete Material ◽  
X Ray

Scanning electron microscope, differential thermal analysis, thermo-gravimetric analysis, fluorescent analysis and X-ray CT et.al. have become usual means used in the research of concrete material science. This paper proposed a new method to evaluate the causes of cracking of in-situ concrete based on the investigation by using these comprehensive technologies for analysis of micro-structure. The proposed new method is more reliable and objective than the traditional method which is mainly based on experience and chemical analysis. A case investigation using the new method to explore the causes of cracking in a real project was introduced.

Shrinkage and corrosion resistance of amorphous metallic-fiber-reinforced cement composites

2014 ◽  
Vol 107 ◽  
pp. 537-543 ◽  
Author(s):  
Se-Jin Choi ◽  
Byung-Tak Hong ◽  
Su-Jin Lee ◽  
Jong-Pil Won
Keyword(s):  
Corrosion Resistance ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Metallic Fiber

Preparation of High Performance Hydrophobic Concrete Material and Experimental Study on Its Corrosion Resistance

2020 ◽  
Vol 12 (9) ◽  
pp. 1341-1351
Author(s):  
Shengbin Li ◽  
Yiyang Ye ◽  
Qin Wu ◽  
Liuyan Gao ◽  
Haoqian Ren
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Steel Wire ◽  
Hydrophobic Surface ◽  
Reinforced Concrete Structure ◽  
Immersion Method ◽  
Nano Composite ◽  
Concrete Material ◽  
Immersion Period

The durability of reinforced concrete structure will be threatened because of corrosion. In view of this situation, in this study, from the perspective of super hydrophobic to improve the durability of concrete materials, a high-performance super hydrophobic concrete material is proposed. The material uses the principle of "binary coordination," which mixes fluorosilane and steel fiber into the composition of concrete, and sets up a copper net on its surface, thus forming a micro-nano-composite structure, making the concrete have a super hydrophobic surface. When characterizing the proposed concrete material, the contact angle of super hydrophobic concrete is 158.3°, rolling angle is 7.6°, and the contact between droplets and concrete conforms to Cassie Baxter model. In the study of corrosion resistance, standard maintenance environment and oxygen diffusion dry wet cycle environment are studied. During the test, a long-term immersion method is used, and the immersion period is set to (30 d, 50 d, 80 d). Compared with different environments, it is found that super hydrophobic concrete has strong corrosion resistance, which shows that the doping of fluorosilicane and steel wire can significantly improve the impermeability of concrete.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

Application of electron holography to material science studies on magnetic domain states of small particles

1993 ◽  
Vol 51 ◽  
pp. 1028-1029
Author(s):  
T. Hirayama ◽  
Q. Ru ◽  
T. Tanji ◽  
A. Tonomura
Keyword(s):  
Magnetic Field ◽  
Material Science ◽  
Science Studies ◽  
Phase Distribution ◽  
Carbon Film ◽  
Objective Lens ◽  
Electron Holography ◽  
Transform Method ◽  
Transmission Electron ◽  
Thin Carbon

The observation of small magnetic materials is one of the most important applications of electron holography to material science, because interferometry by means of electron holography can directly visualize magnetic flux lines in a very small area. To observe magnetic structures by transmission electron microscopy it is important to control the magnetic field applied to the specimen in order to prevent it from changing its magnetic state. The easiest method is tuming off the objective lens current and focusing with the first intermediate lens. The other method is using a low magnetic-field lens, where the specimen is set above the lens gap.Figure 1 shows an interference micrograph of an isolated particle of barium ferrite on a thin carbon film observed from approximately [111]. A hologram of this particle was recorded by the transmission electron microscope, Hitachi HF-2000, equipped with an electron biprism. The phase distribution of the object electron wave was reconstructed digitally by the Fourier transform method and converted to the interference micrograph Fig 1.

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