Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1990-06-25
1993-08-10
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106692, 106713, 106819, C04D 736, C04B 911, C04B 1128, C04B 2806
Patent
active
052344975
ABSTRACT:
A fast setting cementitious composition which upon hydration with water forms a paste-like slurry useful in stopping leaks in the walls of cement pipes. The cementitious composition comprises a dry mixture of a hydraulic cement component having a first Portland cement constituent and a second calcium aluminate constituent, an aggregate component and a lime component. Upon hydration with 23 wt. % water, the resulting slurry has an initial Vicat setting time within the range of 1-5 minutes and a final Vicat setting time of no more than 6 minutes. The cement component contains the first and second cement constituents in weight ratios within the range of 3:2-2:3. The lime component is present in an amount within the range of 1-4 wt. %.
In effecting the repair of a water leak, a paste-like slurry is formed from water and the dry cementitious composition. The cementitious paste is supplied to the repair site. Sufficient force is applied against the paste to hold it against the repair site while allowing the cement to set to provide sufficient strength to offset the hydraulic gradient and stop the water leakage.
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"Design and Control of Concrete Mixtures", Twelfth Edition, Portland Cement Association, pp. 16-24.
"Recommended practice for the use of shrinkage-compensating concrete", Title No. 73-26, American Cement Institute (ACI) Committee 233, ACI Journal, Jun. 1976, pp. 319-339.
"Design and Control of Concrete Mixtures" by Portland Cement Association 13th Ed., 1988. Skokie Ill. pp. 12-18.
Bell Mark L.
Marcheschi Michael A.
Texas Industries Inc.
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