A Magnetic Method for Testing of Homogeneity of Fibre Concrete
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F11%3APU96235" target="_blank" >RIV/00216305:26110/11:PU96235 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
A Magnetic Method for Testing of Homogeneity of Fibre Concrete
Original language description
Homogeneity of fibre concrete structures, characterized, from the macroscopic point of view, by (nearly) constant volume fraction of randomly oriented fibre particles, determines their mechanical, thermal, etc. properties, consequently their long-time behaviour, reliability and range of user applications. Destructive validation of homogeneity is available under laboratory conditions, but frequently impossible in situ. A reasonable alternative to the radiographic control method can be based on stationary measurements of magnetic field strength, thanks to the composite structure with ferromagnetic particles, incorporated in the concrete matrix. The permanent magnet generates a (nearly) stationary magnetic field, whose distribution is described by the Laplace equation, supplied by appropriate boundary conditions, containing the effective relative magnetic permeability as just one material parameter; the crucial problem is then to estimate some formally homogenized (with a priori unknown permeability of fibres) as a function of , without the a priori knowledge of permeability of particles. The paper demonstrates that in such case the numerical analysis of solution of the Laplace equation can be avoided, thus is allowed to be evaluated directly, using local measurements of the magnetic field strength from the Hall-effect-based measurement and non-trivial MATLAB-supported computations, based on the least squares optimization, supported by the Newton method for the numerical evaluation of roots of nonlinear equations.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JN - Civil engineering
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA103%2F09%2F1073" target="_blank" >GA103/09/1073: Developement of Method for Assessment of Hardened Fiber Concrete Homogenity</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
9th International Conference NDT 2011 Nedestruktivní testování v technických oborech
ISBN
978-80-7204-774-1
ISSN
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e-ISSN
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Number of pages
10
Pages from-to
19-29
Publisher name
Neuveden
Place of publication
Brno
Event location
brno
Event date
Dec 7, 2011
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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