scholarly journals Evaluation of Weakening Characteristics of Reinforced Concrete Using High-Frequency Induction Heating Method

2021 ◽  
Vol 11 (12) ◽  
pp. 5402
Author(s):  
Myung-kwan Lim ◽  
Changhee Lee
Keyword(s):  
Thermal Expansion ◽  
Induction Heating ◽  
High Frequency ◽  
Thermal Conduction ◽  
Rapid Heating ◽  
Physical Vulnerability ◽  
Heating Method ◽  
Expansion Pressure ◽  
High Frequency Induction

To increase the quality of recycling, a new demolition technique is required that can work in parallel with existing crushing methods, which use large equipment with high crushing efficiency. Moreover, the efficient collection of the remains from the fractional dismantling method needs to be considered based on its procedure, and the technology for partial dismantling that is efficient in remodeling, maintenance, and reinforcement has to be developed. In this study, the temperature-increasing characteristics of rebars inside ferroconcrete with respect to their arrangement was investigated by partial rapid heating through high-frequency induction heating. Based on this, the chemical and physical vulnerability characteristics of ferroconcrete due to the thermal conduction generated on the rebar surface and the cracks caused by the thermal expansion pressure of the rebar were verified. In addition, the objective of this study was to verify the applicability of the technology by specifying the vulnerability range of ferroconcrete based on the heating range with adequate consumption of energy.

scholarly journals Evaluation of Heating Technique of Deformed Reinforcement Using High-Frequency Induction Heating System

2021 ◽  
Vol 11 (11) ◽  
pp. 4947
Author(s):  
Myung-hwan Lim ◽  
Changhee Lee
Keyword(s):  
Reinforced Concrete ◽  
Temperature Rise ◽  
High Frequency ◽  
Thermal Conduction ◽  
Rapid Heating ◽  
Heating System ◽  
Inductive Heating ◽  
Reinforced Steel ◽  
Induction Heating System ◽  
High Frequency Induction

To improve recycling quality, it is necessary to develop a demolition technology that can be combined with existing crushing methods that employ large shredding-efficient equipment. The efficient collection of bones in a segmentation dismantling method must be considered according to the procedure. Furthermore, there is a need for the development of partial dismantling technologies that enable efficient remodeling, maintenance, and reinforcement. In this study, we experimentally investigated the temperature-rise characteristics of reinforced concrete through partial rapid heating during high-frequency induced heating. Accordingly, the chemical and physical vulnerability characteristics of the reinforced concrete were verified by studying the thermal conduction on the surface of the rebars and the cracks caused by the thermal expansion pressure of the rebars. Furthermore, we aimed to verify the applicability of the proposed technology by specifying the vulnerability range of the reinforced concrete based on the heating range, as well as the appropriate energy consumption. We investigated the temperature rise and temperature distribution characteristics of the rebar surfaces based on diameter, length, bar placement conditions, heating distance, heating coil location, and output, using reinforced steel of grade SD345. Maximum powers of 5, 6, and 10 kW, and inductive heating were used to achieve satisfactory results.

Mechanical properties of (W,Ti)C and (W,Ti)C–NiAl3 cermet consolidated by the high-frequency induction-heating method

2013 ◽  
Vol 568 ◽  
pp. 73-77 ◽  
Author(s):  
Wonbaek Kim ◽  
Chang-Yul Suh ◽  
Ki-Min Roh ◽  
Sung-Wook Cho ◽  
Kwon-Il Na ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Induction Heating ◽  
High Frequency ◽  
Heating Method ◽  
High Frequency Induction

Rapid sintering of nanocrystalline 8 mol.%Y2O3-stabilized ZrO2 by high-frequency induction heating method

2006 ◽  
Vol 12 (5) ◽  
pp. 393-398 ◽  
Author(s):  
Hwan -Cheol Kim ◽  
In -Jin Shon ◽  
In -Kyoon Jeong ◽  
In -Yong Ko
Keyword(s):  
Induction Heating ◽  
High Frequency ◽  
Heating Method ◽  
Rapid Sintering ◽  
High Frequency Induction

Brazing of Aluminum Tubes Using Induction Heating

2012 ◽  
Vol 463-464 ◽  
pp. 1405-1409 ◽  
Author(s):  
Kristína Demianová ◽  
Mária Behúlová ◽  
Ožvold Milan ◽  
Milan Turňa ◽  
Miroslav Sahul
Keyword(s):  
Induction Heating ◽  
High Frequency ◽  
Al Alloys ◽  
Temperature Fields ◽  
Leak Test ◽  
Basic Parameters ◽  
Brazed Joints ◽  
Edx Microanalysis ◽  
High Frequency Induction

The contribution deals with the design of a progressive metallurgical joining of the solar collector parts by brazing. The main aim was to replace flame brazing by the more advantageous technology of brazing using high-frequency induction heating. New equipment and the induction coil of a suitable shape were designed for the joint manufacturing. Based on the numerical simulations of electromagnetic and temperature fields, the basic parameters of induction brazing were suggested in order to achieve the desired temperature distribution at the spot of the future joint. To check the quality of the brazed joints, a leak test, optical microscopy and EDX microanalysis were used to study the area of the brazed joints interface. Impact of brazing time and power supply on brazeability of Al alloys components by means of the AlSi12 braze were assessed.

Synthesis of Al2O3/AlB12/Al Composite Ceramic Powders by High Frequency Induction Heating Method and a Study of Their Mechanical Properties

2010 ◽  
Vol 139-141 ◽  
pp. 63-66
Author(s):  
Kai Jin Huang ◽  
Chao Dong Tan
Keyword(s):  
Induction Heating ◽  
High Frequency ◽  
Bending Strength ◽  
Composite Ceramic ◽  
Composite Ceramics ◽  
Ceramic Powders ◽  
Heating Method ◽  
Al Composite ◽  
Pure Al2o3 ◽  
High Frequency Induction

Pure Al2O3/AlB12/Al composite ceramic powders have been synthesized using high frequency induction heating method. This method starts from Al and B2O3 powder mixtures, after which Al2O3/AlB12/AlN composite ceramics were fabricated by hot-press sintering at 16000C for 2h under the protection of a N2 atmosphere. The bending strength and the fracture toughness of the ceramics were measured by the three-point bending method and the indentation fracture method, respectively. The results show that the pure Al2O3/AlB12/Al composite ceramic powders can be successfully synthesized by high frequency induction heating method. Al2O3 and AlB12 phases were formed by the liquid-liquid reaction mechanism and the liquid-solid reaction mechanism, respectively. The bending strength and the fracture toughness of the Al2O3/AlB12/AlN composite ceramics were 549.48MPa and 5.96MPa.m1/2, respectively. These values are 56.99% and 49% greater than those of the pure Al2O3 ceramic (350MPa and 4MPa.m1/2).

Rapid Sintering and Synthesis of Nanostuctured FeCrAlSi-Al2O3 Composite by High-Frequency Induction Heating

2011 ◽  
Vol 49 (03) ◽  
pp. 231-236 ◽  
Author(s):  
Song-Lee Du ◽  
Sung-Hun Cho ◽  
In-Yong Ko ◽  
Jung-Mann Doh ◽  
Jin-Kook Yoon ◽  
...  
Keyword(s):  
Induction Heating ◽  
High Frequency ◽  
Al2o3 Composite ◽  
Rapid Sintering ◽  
High Frequency Induction
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