E - Fixed Constructions – 04 – B
Patent
E - Fixed Constructions
04
B
E04B 1/70 (2006.01) G05D 22/02 (2006.01)
Patent
CA 2048997
A method and apparatus for expulsion or control of humidity in a concrete and/or masonry structure wherein one or more electrodes are provided in the structure. The electrodes are made of a non-corrosive material, and connected in series or parallel with the current source. An earth electrode is provided adjacent to or on the structure. The electrode(s) represents the anode and the earth electrode represents the cathode in an electrode circuit when they are connected with the respective outputs in the current source. The anode and cathode are provided with a pulse voltage supplied by the current source. The pulse voltage is delivered sequentially as pulse sequences of a given pattern. The anode is fed with a pulse sequence generated with a first negative pulse, followed by a neutral interval of zero voltage of a duration between 0 - 2 times the duration of the negative pulse, followed by a positive pulse, the duration of which is about 6 times the duration of the negative pulse and by simultaneously feeding the cathode with a corresponding pulse sequence, but with inverted polarity. The method includes a first phase for quick reduction of the relative humidity in the structure (typically two weeks) with a pulse sequence frequency of about 1 - 0.5 Hz followed by a second phase for maintenance of a permanently low humidity content (with a pulse sequence frequency of about 0.2 - 0.1 times the pulse sequence frequency of the first phase).
Electro Pulse Technologies Of America Inc.
Kirby Eades Gale Baker
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