Radio wave heater for concrete

In dielectric heating, the specimen is placed in an electromagnetic field that alternates at high frequency. Electrically charged molecules and ions start to vibrate and the temperature of the material rises. The domestic microwave oven is an example of this phenomenon. Microwave radiation penetrate...

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Bibliographic Details
Published in:Cement and concrete research 1996-05, Vol.26 (5), p.677-682
Main Author: Leivo, Markku
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Concretes. Mortars. Grouts
Exact sciences and technology
Materials
Transport. Placing. Subsequent treatments. Curing
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Summary:In dielectric heating, the specimen is placed in an electromagnetic field that alternates at high frequency. Electrically charged molecules and ions start to vibrate and the temperature of the material rises. The domestic microwave oven is an example of this phenomenon. Microwave radiation penetrated fresh concrete to a depth of about 2 cm only. Penetration with radio frequency was far better. A radio frequency heater was found to be an effective heater for concrete. The following conclusions can be drawn from the results: A whole mass of concrete can be heated simultaneously. With this heater it is possible to raise the concrete temperature to 50–60°C in just a few minutes (3–4 minutes).
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(96)85003-4