The Heat Treatment of Concrete in an Electromagnetic Field,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The authors describe briefly a method and a technology developed for accelerated setting of concrete in an electromagnetic field, using commercial-frequency current. The heating of the concrete is produced by induction of the ferromagnetic elements contained in the reinforced and ordinary concrete, and also as a result of the fact that concrete constitues a relaxation-polarized system with respect to the electromagnetic field, so that heat transfer in the concrete occurs not only under the influence of temperature and concentration gradients, but also under the influence of magnetic and electric field gradients, and also under the influence of differences in the magnetic and electric field intensity vectors at the given instant of time and in the equilibrium state. The method permits a smooth control of the heating of the concrete by continuously regulating the magnetic field intensity. In addition, the external electromagnetic field, under definite conditions, affects directly also the hydrodynamics, heat and mass exchange, the rate of occurrence of the chemical reactions, structural-mechanical properties of the concrete.
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