The Activation Technology for the Surface Modification High Voltage Electric Field Dispersed Mineral Additives for Concrete

2020 ◽  
Vol 1011 ◽  
pp. 23-30
Author(s):  
A. Khalyushev ◽  
A. Mayilyan ◽  
Sergey Stelmakh ◽  
Evgeniy Shcherban
Keyword(s):  
Surface Modification ◽  
Electric Field ◽  
Calcium Hydroxide ◽  
High Voltage ◽  
Sedimentation Rate ◽  
Liquid System ◽  
Interparticle Interactions ◽  
Surface Modified ◽  
Solid Liquid ◽  
Mineral Additives

The aim of the research was to study the activation technology of the materials for concrete by their surface modification in a high-voltage electric field. It is noted that the mineral additives modified in a high-voltage electric field are characterized by a higher activity of the calcium hydroxide absorption. It was established that, despite the presence of a large number of crystalline compounds in metakaolin, its pozzolanic activity in the absorption of calcium hydroxide from a saturated solution is quite high. The same value of the hydration activity coefficient is also determined for the ground slag. The authors found that a characteristic feature of the dispersed mineral additives, surface-modified in a high-voltage electric field in comparison with control samples, are the lower values ​​of bulk density and repose angle. This is due to a change in the forces balance that occurs during the mutual contact of particles. The influence of the mineral additives’ surface modification in a high-voltage electric field on interparticle interactions in the “solid – liquid” system is evaluated. It is established that in the absence of a repulsion barrier, the particles form the aggregates that increase their sedimentation rate. During unipolar or bipolar charging of particles in an electric field, the sedimentation rate slows down or accelerates accordingly. These effects are used to modify the cement surface.

Effect of surface modification of SiO2@TiO2core–shell particles on the structural colour under an electric field

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6489-6493 ◽  
Author(s):  
Xuanxuan Qiao ◽  
Yuxia Luo ◽  
Aihua Sun ◽  
Chongyang Wang ◽  
Jianfei Zhang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Electric Field ◽  
Core Shell ◽  
Structural Colour ◽  
Shell Particles ◽  
Surface Modified ◽  
Effect Of Surface

Surface modified colloidal SiO2@TiO2core–shell particles were chosen to study their responsive photonic properties and the effect of surface on structural colour under low electric field.

Structural Formation of the Cement Pastes Based on the Concrete Modified Dispersed Mineral Components

2020 ◽  
Vol 1011 ◽  
pp. 14-22
Author(s):  
A. Khalyushev ◽  
Sergey Stelmakh ◽  
Evgeniy Shcherban ◽  
A. Chernilnik
Keyword(s):  
Surface Modification ◽  
Electric Field ◽  
Structure Formation ◽  
High Voltage ◽  
Angle Of Repose ◽  
Cement Stone ◽  
Formation Processes ◽  
Cement Pastes ◽  
Structural Formation ◽  
Plastic Strength

With the increase in the number of finely dispersed mineral additives in concrete, their water demand increases and the effect of micro-filling weakens. To solve this problem, various methods of dry surface modification are proposed. As a result of the finely dispersed mineral powders’ surface modification, an improvement in their rheological characteristics, a decrease in wettability, a change in granulometry and other properties are achieved. This article discusses the surface modification effect’s laws in a high-voltage electric field on the autogenous properties of mineral dispersed concrete components, structure formation processes, mechanical properties, and cement stone hydration products. According to the results of the study, it was found that the surface modification of bulk materials - concrete components - in a high-voltage electric field changes autohesion properties in comparison with control samples. The data indicate lower values ​​of bulk density and angle of repose. This is due to a change in the balance of forces that arise during the mutual contact of particles after surface modification. With a certain balance of these forces, autohesion will contribute to the dense packing of particles and thereby affect the structure formation processes. The results of changes in the plastic strength of cement pastes confirm that there is an intensification of the structure formation process. Moreover, a more intense increase in plastic strength is observed during bipolar charging of particles in comparison with unipolar charging. This is due to an increase in the number of heterogeneous charges in the system and, as a consequence, an increase in the strength of adhesive contacts, as evidenced by the data of X-ray phase analysis.

PEMANFAATAN RADIASI ENERGI TEGANGAN 150 KV UNTUK LAMPU LED PENERANGAN JALAN

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Mauludi Manfaluthy
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
High Voltage ◽  
Low Frequency ◽  
Energy Utilization ◽  
World Health ◽  
Electromagnetic Signals ◽  
Health Organization ◽  
The Magnetic Field ◽  
Low Frequency Waves

WHO (World Health Organization) concludes that not much effect is caused by electric field up to 20 kV / m in humans. WHO standard also mentions that humans will not be affected by the magnetic field under  100 micro tesla and that the electric field will affect the human body with a maximum standard of 5,000 volts per meter. In this study did not discuss about the effect of high voltage radiation SUTT (High Voltage Air Channel) with human health. The research will focus on energy utilization of SUTT radiation. The combination of electric field and magnetic field on SUTT (70-150KV) can generate electromagnetic (EM) and radiation waves, which are expected to be converted to turn on street lights around the location of high voltage areas or into other forms. The design of this prototype works like an antenna in general that captures electromagnetic signals and converts them into AC waves. With a capacitor that can store the potential energy of AC and Schottky diode waves created specifically for low frequency waves, make the current into one direction (DC). From the research results obtained the current generated from the radiation is very small even though the voltage is big enough.Keywords : Radiance Energy, Joule Thief, and  LED Module.

Instrument for measuring the electric field vector of high-voltage equipment

1983 ◽  
Vol 26 (1) ◽  
pp. 49-50
Author(s):  
I. P. Klimashevskii ◽  
B. L. Kondrat'ev ◽  
V. A. Poletaev ◽  
V. M. Yurkevich
Keyword(s):  
Electric Field ◽  
High Voltage ◽  
Field Vector ◽  
Electric Field Vector

scholarly journals High Voltage Insulating Materials—Current State and Prospects

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3799
Author(s):  
Pawel Rozga ◽  
Abderahhmane Beroual
Keyword(s):  
High Voltage ◽  
Power Transformers ◽  
Insulating Materials ◽  
Current State ◽  
Solid Liquid

Progression in the field of insulating materials for power transformers and other high voltage devices is visible regardless of the type of insulation: solid, liquid, or gas [...]

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