Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1989-06-09
1991-05-14
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041801, 204130, 204299R, B01D 1302
Patent
active
050153510
ABSTRACT:
An electro-osmotic dewatering procedure is disclosed for removing water from saturated, porous building materials, such as concrete, brick and the like. A controlled, cyclical voltage is applied to an electrode system, to effect osmotic migration of water from an anode electrode, located within the structure or in contact with it, to a cathode electrode, typically spaced from the structure but in electrical circuit with it. The cycle of operations includes a first energy pulse in a direction to effect osmotic migration, followed by a substantially shorter but definite pulse of reverse polarity to prevent or minimize formation of insulating gas films and/or corrosion products. Transition from the primary pulse to the reverse pulse, and from the reverse pulse to the subsequent primary pulse, is at a controlled rate to permit discharge of stored voltage, as a function of inherent capacitance of the system, and to avoid generation of RFI radiations. For treating reinforced concrete, cycling is preferably controlled automatically, as a function of the monitored passivity or non-passivity of the internal reinforcement, so as to avoid creation of corrosion products. Certain aspects of the invention are applicable to other treatments of reinforced concrete, such as realkalization.
REFERENCES:
patent: 3856646 (1974-12-01), Moraru
patent: 4145270 (1979-03-01), Moraru
patent: 4600486 (1986-07-01), Oppitz
Niebling John F.
Phasge Arun S,.
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