Metallic sheath for a posttensioning method provided with rust p

Details Metallic sheath for a posttensioning method provided with rust p Metallic sheath for a posttensioning method provided with rust p

1983-09-01

1985-12-10

Murtagh, John E.

Static structures (e.g., buildings)

Irreversibly reactive component

428418, 5230913, E04C 310

Patent

active

045570876

ABSTRACT:
A metallic sheath for a posttensioning method wherein an outer peripheral surface or outer and inner peripheral surfaces thereof is (or are) coated with phosphate layer (or layers) and plastic resin layer (or layers) thereupon and preferably further coated with a solid lubricating layer upon the inner peripheral surface of the sheath.
The phosphate layer of the outer peripheral surface protect the metallic sheath from corrosion by negative ion within concrete, while, on the other hand, that of the inner peripheral surface prevents the electrochemical corrosion between the inner peripheral surface of the sheath and tendon.
Moreover, if a solid lubricating, layer is provided at the inner peripheral surface of the sheath, the sliding friction between the metallic sheath and tendon can be decreased so that prestressed force can be increased as much.

REFERENCES:
patent: 3513609 (1970-05-01), Lang
patent: 3646748 (1972-03-01), Lang
patent: 3909424 (1975-09-01), Clark
patent: 3922437 (1975-11-01), Kitta
patent: 3963450 (1976-06-01), Davies
patent: 4037979 (1977-07-01), Fastenau
patent: 4068963 (1978-01-01), Brandestini
patent: 4363462 (1982-12-01), Wlodkowski
patent: 4442646 (1984-04-01), Prevedini

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