A method and apparatus for expulsion or control of humidity in a concreteand/or masonry structure wherein one or more electrodes are provided in thestructure. The electrodes are made of a non-corrosive material, and connectedin series or parallel with the current source. An earth electrode is providedadjacent to or on the structure. The electrode(s) represents the anode and theearth electrode represents the cathode in an electrode circuit when they areconnected with the respective outputs in the current source. The anode andcathode are provided with a pulse voltage supplied by the current source. Thepulse 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 - 2times the duration of the negative pulse, followed by a positive pulse, theduration of which is about 6 times the duration of the negative pulse and bysimultaneously feeding the cathode with a corresponding pulse sequence, butwith inverted polarity. The method includes a first phase for quick reductionof the relative humidity in the structure (typically two weeks) with a pulsesequence frequency of about 1 - 0.5 Hz followed by a second phase formaintenance of a permanently low humidity content (with a pulse sequencefrequency of about 0.2 - 0.1 times the pulse sequence frequency of the firstphase).
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