Stock material or miscellaneous articles – Two dimensionally sectional layer
Patent
1986-10-06
1988-04-26
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Two dimensionally sectional layer
428 47, 428501, 428518, 428913, 404 64, 52232, 52396, B32B 314, B32B 2708, E04C 200, E04B 162
Patent
active
047404043
ABSTRACT:
The waterstop used to prevent passage or leakage of water through a construction joint of concrete is shaped of a plastic or rubber in the form of a continuous-length belt-like form and provided with a water-swellable rubbery layer on at least a portion, or, for example, along the peripheries of the belt-like form, side-by-side coming into contact with the concrete bodies to serve as a water-tight filling of the joint by being swollen with water. The water-swellable rubbery layer is protected temporarily prior to use with a coating film of an alkali-soluble polymeric material which can at least partially be dissolved away by the alkalinity of the water in the concrete joint. The peripheries of the plastic- or rubber-made belt-like form are preferably in a length-wise bulged form having a bore running therethrough to serve as a stress absorber when the water-swellable rubbery layer is swollen with water. The disclosure also includes a particularly preferred water-swellable rubbery composition formed of a matrix comprising an acrylonitrile-butadiene rubber, polyvinyl chloride resin and chlorinated polyethylene and a dispersed phase of a water-swellable crosslinked polymer.
REFERENCES:
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patent: 4041665 (1977-08-01), de Munck
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patent: 4558875 (1985-12-01), Yamji et al.
patent: 4622784 (1986-11-01), Black et al.
Journal of the American Concrete Industry; Waterstop in Concrete Construction; pp. 84-88; Sep. 1955.
Ishihara Yuji
Kushida Takashi
Otsugu Shozo
Sasayama Hiroharu
Terauchi Michiyoshi
C. I. Kasei Co. Ltd.
Ryan Patrick J.
Swisher Nancy A. B.
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