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US 4,045,533 AGranted
Method of manufacturing prestressed reinforced concrete articles
OwnerViktor Vasilievich Mikhailov, Semen Lvovich Litver +1inventors
InventorsViktor Vasilievich Mikhailov, Semen Lvovich Litver, Alexandr Konstantinovich Karasev
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Abstract
A method of making stressed concrete articles made from a cement containing as an additive to portland cement a mixture of alumina cement, calcium sulfate and ground caustic lime, the method including hydrothermal treatment at 50.degree. C or above followed by curing in cold water for several days.
Claims4
A method of manufacturing prestressed reinforced concrete articles, consisting essentially of the following operations:
- moulding the articles from a concrete containing a stressing cement mixture of Portland cement with an added expanding component consisting essentially of a mixture of calcium sulphate, calcium aluminates and calcium oxide;
- curing the articles until they acquire a stripping strength;
- stripping said articles, subjecting said articles to hydrothermal treatment under water at a temperature which is not below 50.degree. C for 1-4 hours, and subsequently keeping said articles in cold water for 3-4 days.
Dependencies are inferred from the claim text.