Cement compositions
First Claim
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1. A cement composition, substantially free from Portland cement, comprising high alumina cement, beta-anhydrite, in a ratio of from 3:
- 7 to 4;
1 by weight based on the weight of the high alumina cement and 2.0-8.5% by weight based on the weight of the high alumina cement of at least one form of lime selected from the group consisting of calcium oxide and calcium hydroxide, and which when mixed with water can accommodate high water contents up to 5;
1 of water to solid constituents without free water separating out, and hydrates to form a hardened cement containing ettringite.
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Abstract
A cement composition which when mixed with water hydrates to form a hardened cement containing ettringite comprises a high alumina cement, beta-anhydrite and calcium oxide and/or calcium hydroxide. The composition may also contain a calcium sulphate which is partially water soluble, an alkali metal sulphate, an accelerator for the high alumina cement such as lithium carbonate, and/or a bentonite clay. The composition is particularly suitable for filling cavities in mines.
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18 Claims
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1. A cement composition, substantially free from Portland cement, comprising high alumina cement, beta-anhydrite, in a ratio of from 3:
- 7 to 4;
1 by weight based on the weight of the high alumina cement and 2.0-8.5% by weight based on the weight of the high alumina cement of at least one form of lime selected from the group consisting of calcium oxide and calcium hydroxide, and which when mixed with water can accommodate high water contents up to 5;
1 of water to solid constituents without free water separating out, and hydrates to form a hardened cement containing ettringite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- 7 to 4;
Specification