Very early setting ultra high early strength cement

Details Very early setting ultra high early strength cement Very early setting ultra high early strength cement

1989-06-08

1990-09-18

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106694, 106695, 106722, C04B 732

Patent

active

049575562

ABSTRACT:
Methods for forming very early setting, ultra high strength cements and the cements so produced are claimed. The methods comprise forming a mixture of raw materials containing SiO.sub.2, Al.sub.2 O.sub.3, CaO, Fe.sub.2 O.sub.3, and SO.sub.3, respectively designated S, A, C, F, and S such that the overall molar ratio of A/F exceeds approximately 0.64 and the overall molar ratio of S/A+F is between approximately 0.35 and 0.25. This mixture is heated to n elevated temperature between 1,000.degree. C. and 1,200.degree. C. for a sufficient period of time to produce a clinker containing high concentrations of C.sub.4 A.sub.3 S. The average amount of C.sub.4 A.sub.3 S is then determined and a final mixture is formed utilizing the high C.sub.4 A.sub.3 S clinker, C containing hydraulic or portland type cement and soluble CS anhydride to produce a final cement mixture having a C.sub.4 A.sub.3 S content of approximately 10% to 30% by weight, a soluble CS anhydride content of approximately 5% to 20% by weight, and the remainder being hydraulic or portland type cement. The cements so produced exhibit very early, ultra high strength ranging from 3,000 psi to 5,000 psi in one hour, 6,000 psi in one day, and 11,000 psi in 28 days.

REFERENCES:
patent: 3155526 (1964-11-01), Klein
patent: 3194673 (1965-07-01), Schedel
patent: 3860433 (1975-01-01), Ost et al.
patent: 4036657 (1977-07-01), Mehta
patent: 4249952 (1981-02-01), Davis, Jr.
patent: 4798628 (1989-01-01), Mills et al.

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