11 research outputs found
ΠΡΠ΅Π½ΠΊΠ° ΠΊΠΎΡΡΠΎΠ·ΠΈΠΈ Π±Π΅ΡΠΎΠ½Π° ΠΏΡΠΈ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠΈ ΡΠΎΠ»Π΅ΠΉ Ρ Π»ΠΎΡΠΈΠ΄ΠΎΠ²
The paper provides results of experimental concrete research under conditions of concentrated chloride salt solutions. General principles of forecasting concrete corrosion resistance under salt physical corrosion are given in the paper. Analytical dependences for quantitative estimation of corroded concrete have been obtained.ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π±Π΅ΡΠΎΠ½Π° Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² ΡΠΎΠ»Π΅ΠΉ Ρ
Π»ΠΎΡΠΈΠ΄ΠΎΠ². ΠΠ°Π½Ρ ΠΎΠ±ΡΠΈΠ΅ ΠΏΡΠΈΠ½ΡΠΈΠΏΡ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΎΡΡΠΎΠ·ΠΈΠΎΠ½Π½ΠΎΠΉ ΡΡΠΎΠΉΠΊΠΎΡΡΠΈ Π±Π΅ΡΠΎΠ½Π° ΠΏΡΠΈ ΡΠΎΠ»Π΅Π²ΠΎΠΉ ΡΠΎΡΠΌΠ΅ ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠΎΡΡΠΎΠ·ΠΈΠΈ. ΠΠΎΠ»ΡΡΠ΅Π½Ρ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ Π΄Π»Ρ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΊΠΎΡΡΠΎΠ·ΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΡ Π±Π΅ΡΠΎΠ½Π°
ΠΡΠ΅Π½ΠΊΠ° ΡΠΎΡΠ±ΡΠΈΠΎΠ½Π½ΡΡ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΠΌΠ½Ρ
A mathematical model for calculation of moisture quantity absorbed by a cement stone being in usage has been constructed. It is shown that humidity of a cement stone depends on parameters of material structure and relative air humidity. The model is necessary for forecasting corrosion processes.Β ΠΠΎΠ»ΡΡΠ΅Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ Π΄Π»Ρ ΡΠ°ΡΡΠ΅ΡΠ° ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° Π²Π»Π°Π³ΠΈ, ΠΏΠΎΠ³Π»ΠΎΡΠ°Π΅ΠΌΠΎΠΉ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΡΠΌ ΠΊΠ°ΠΌΠ½Π΅ΠΌ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π²Π»Π°ΠΆΠ½ΠΎΡΡΡ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΠΌΠ½Ρ Π·Π°Π²ΠΈΡΠΈΡ ΠΎΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΡΡΡΠΊΡΡΡΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΈ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ Π²Π»Π°ΠΆΠ½ΠΎΡΡΠΈ Π²ΠΎΠ·Π΄ΡΡ
Π°. ΠΠΎΠ΄Π΅Π»Ρ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠ° Π΄Π»Ρ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΎΡΡΠΎΠ·ΠΈΠΎΠ½Π½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ²
ΠΠΠ‘ΠΠ ΠΠ‘Π‘-ΠΠΠ’ΠΠ ΠΠ¦ΠΠΠΠ ΠΠ€Π€ΠΠΠ’ΠΠΠΠΠ‘Π’Π ΠΠ ΠΠ’ΠΠΠΠΠΠ ΠΠΠΠ«Π₯ ΠΠΠΠΠΠΠ
Usage of chemical additives while executing concrete works at negative temperatures is considered as a convenient and economical method. Range of the used antifreeze additives is rather wide. A great number of new additives are advertised but their characteristics have not been practically studied. Evaluation of the antifreeze additive efficiency is unfortunately rather long process and it does not provide comprehensive data on concrete structure formation processes. Due to this development of rapid and comprehensive methodology for construction companies is urgently required.Freezing processes of antifreeze additive aqueous solutions and hardening of cement paste with them have been investigated in the paper. The paper proposes a methodology for determination of freezing point for aqueous solutions of chemical additives of various applications. Identity ofΒ freezing point for a chemical additive aqueous solution and cement paste with an equal concentration of the additive in the paste pore fluid has been determined while takingΒ calcium nitrate and sodium formate additives as an example. The paper demonstrates the possibility to evaluate efficiency of antifreeze additive action on the basis of kinetics in temperature changes of the cement paste with additives by its consecutive freezing and defrosting.Β A methodology for operational evaluation in the field of chemical additive application for concreting items at negative temperatures has been offered in the paper.Β The methodology does not requireΒ deficient and expensive test-equipment. It can be applied at ordinary construction companies and it is comprehensible for personnel of low-qualification.Β The paper shows the possibility to develop an original methodology for designing concrete structure which is based on operating efficiency determinations Β for single and integrated antifreeze additives.ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ Π²Π΅Π΄Π΅Π½ΠΈΡ Π±Π΅ΡΠΎΠ½Π½ΡΡ
ΡΠ°Π±ΠΎΡ ΠΏΡΠΈ ΠΎΡΡΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ°Ρ
β ΡΠ΄ΠΎΠ±Π½ΡΠΉ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄. ΠΠ°ΠΌΠΌΠ° ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΠΌΡΡ
ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΎΡΠΎΠ·Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ Π²Π΅ΡΡΠΌΠ° ΡΠΈΡΠΎΠΊΠ°. Π Π΅ΠΊΠ»Π°ΠΌΠΈΡΡΡΡΡΡ ΠΌΠ½ΠΎΠ³ΠΎΡΠΈΡΠ»Π΅Π½Π½ΡΠ΅ Π½ΠΎΠ²ΡΠ΅ Π΄ΠΎΠ±Π°Π²ΠΊΠΈ, Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΊΠΎΡΠΎΡΡΡ
ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈ Π½Π΅ ΠΈΠ·ΡΡΠ΅Π½Ρ. ΠΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΎΡΠΎΠ·Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ, ΠΊ ΡΠΎΠΆΠ°Π»Π΅Π½ΠΈΡ, Π΄Π»ΠΈΡΠ΅Π»ΡΠ½Π° ΠΈ Π½Π΅ Π΄Π°Π΅Ρ ΠΈΡΡΠ΅ΡΠΏΡΠ²Π°ΡΡΠ΅ΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ°Ρ
ΡΡΡΡΠΊΡΡΡΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ Π±Π΅ΡΠΎΠ½Π°, Π² ΡΠ²ΡΠ·ΠΈ Ρ ΡΠ΅ΠΌ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠΉ ΠΈ Π΄ΠΎΡΡΡΠΏΠ½ΠΎΠΉ Π΄Π»Ρ ΡΡΡΠΎΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ Π½Π°ΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠ°.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΠΏΡΠΎΡΠ΅ΡΡΡ Π·Π°ΠΌΠ΅ΡΠ·Π°Π½ΠΈΡ Π²ΠΎΠ΄Π½ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΎΡΠΎΠ·Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ ΠΈ ΡΠ²Π΅ΡΠ΄Π΅Π½ΠΈΡ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΡΠ° Ρ Π½ΠΈΠΌΠΈ. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ Π·Π°ΠΌΠ΅ΡΠ·Π°Π½ΠΈΡ Π²ΠΎΠ΄Π½ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠ³ΠΎ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ. ΠΠ° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ Π΄ΠΎΠ±Π°Π²ΠΎΠΊ Π½ΠΈΡΡΠ°ΡΠ° ΠΊΠ°Π»ΡΡΠΈΡ ΠΈ ΡΠΎΡΠΌΠΈΠ°ΡΠ° Π½Π°ΡΡΠΈΡ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π° ΠΈΠ΄Π΅Π½ΡΠΈΡΠ½ΠΎΡΡΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ Π·Π°ΠΌΠ΅ΡΠ·Π°Π½ΠΈΡ Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ²ΠΎΡΠ° Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ Π΄ΠΎΠ±Π°Π²ΠΊΠΈ ΠΈ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΡΠ° Ρ ΡΠ°Π²Π½ΠΎΠΉ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠ΅ΠΉ Π΄ΠΎΠ±Π°Π²ΠΊΠΈ Π² ΠΏΠΎΡΠΎΠ²ΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ ΡΠ΅ΡΡΠ°. ΠΠΎΠΊΠ°Π·Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΎΡΠΎΠ·Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ ΠΏΠΎ ΠΊΠΈΠ½Π΅ΡΠΈΠΊΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ ΡΠ΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΡΠ° Ρ Π΄ΠΎΠ±Π°Π²ΠΊΠ°ΠΌΠΈ ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²ΠΎΠΌ Π΅Π³ΠΎ ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π·Π°ΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π½ΠΈΡ ΠΈ ΡΠ°Π·ΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π½ΠΈΡ. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ Π΄Π»Ρ Π±Π΅ΡΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ ΠΏΡΠΈ ΠΎΡΡΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ°Ρ
. ΠΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° Π½Π΅ ΡΡΠ΅Π±ΡΠ΅Ρ Π΄Π΅ΡΠΈΡΠΈΡΠ½ΠΎΠ³ΠΎ ΠΈ Π΄ΠΎΡΠΎΠ³ΠΎΡΡΠΎΡΡΠ΅Π³ΠΎ ΠΈΡΠΏΡΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΡ, ΠΏΡΠΈΠΌΠ΅Π½ΠΈΠΌΠ° Π² ΡΡΠ΄ΠΎΠ²ΡΡ
ΡΡΡΠΎΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΡΡ
, Π΄ΠΎΡΡΡΠΏΠ½Π° ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠ°ΠΌ Π½ΠΈΠ·ΠΊΠΎΠΉ ΠΊΠ²Π°Π»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΎΡΠΈΠ³ΠΈΠ½Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΡΠ°Π²Π° Π±Π΅ΡΠΎΠ½Π°, ΠΎΡΠ½ΠΎΠ²ΡΠ²Π°ΡΡΠ΅ΠΉΡΡ Π½Π° ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΡΡ
ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡΡ
ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΎΠ΄ΠΈΠ½Π°ΡΠ½ΡΡ
ΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΎΡΠΎΠ·Π½ΡΡ
Π΄ΠΎΠ±Π°Π²ΠΎΠΊ
Estimation of Sorption Cement Stone Characteristics
A mathematical model for calculation of moisture quantity absorbed by a cement stone being in usage has been constructed. It is shown that humidity of a cement stone depends on parameters of material structure and relative air humidity. The model is necessary for forecasting corrosion processes
Estimation of Concrete Corrosion Due to Attack of Chloride Salt
The paper provides results of experimental concrete research under conditions of concentrated chloride salt solutions. General principles of forecasting concrete corrosion resistance under salt physical corrosion are given in the paper. Analytical dependences for quantitative estimation of corroded concrete have been obtained
ΠΠ ΠΠΠΠ’ΠΠ ΠΠΠΠΠΠ Π‘ΠΠ‘Π’ΠΠΠ ΠΠΠ’ΠΠΠ Π‘ Π£Π§ΠΠ’ΠΠ ΠΠΠ ΠΠΠ ΠΠΠΠ‘Π’ΠΠΠΠΠ‘Π’Π
A calculative-graphic method for designing structure of heavy concrete with chemical additives is developed in the paper. The paper presents a system of concrete frost resistance forecasting which is based on estimation of structural and mechanical characteristics of a material. Accuracy of calculations shown in the paper is rather sufficient for practical purposes.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½ ΡΠ°ΡΡΠ΅ΡΠ½ΠΎ-Π³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΡΠ°Π²Π° ΡΡΠΆΠ΅Π»ΠΎΠ³ΠΎ Π±Π΅ΡΠΎΠ½Π° Ρ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π΄ΠΎΠ±Π°Π²ΠΊΠ°ΠΌΠΈ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΡΠΈΡΡΠ΅ΠΌΠ° ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΎΡΠΎΠ·ΠΎΡΡΠΎΠΉΠΊΠΎΡΡΠΈ Π±Π΅ΡΠΎΠ½Π°, ΠΎΡΠ½ΠΎΠ²Π°Π½Π½Π°Ρ Π½Π° ΠΎΡΠ΅Π½ΠΊΠ΅ ΡΡΡΡΠΊΡΡΡΠ½ΠΎ-ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°. ΠΠΎΠΊΠ°Π·Π°Π½Π° Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½Π°Ρ Π΄Π»Ρ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅Π»Π΅ΠΉ ΡΠΎΡΠ½ΠΎΡΡΡ ΡΠ°ΡΡΠ΅ΡΠΎΠ²
The transmission spectrum switching speed of electromagnetic band gap plasma structure
International audienc
One-dimensional electromagnetic band gap plasma structure formed by atmospheric pressure plasma inhomogeneities
International audienc
Delay of a microwave pulse in a photonic crystal
Propagation of a nanosecond microwave pulse through a photonic crystal placed into an X-band waveguide is investigated. The nanosecond pulse is produced via shortening of the microsecond microwave pulse by the plasma electromagnetic band gap structure, which is formed in the waveguide by microwave breakdown ignited discharges inside three neon-filled glass tubes. Measured delay time for nanosecond microwave pulse propagation through the photonic crystal is about 23βns that is in good agreement with the value obtained by numerical simulation. This time delay value corresponds to the group velocity of microwave pulses in the photonic crystal , where is the speed of light in vacuum