Hydraulic cements prepared from glass powders
First Claim
1. A hydraulic cement exhibiting high mechanical strength, long term durability against attack by water, and, after curing, essential freedom from creep, said cement composed of glass powders consisting essentially, expressed in terms of mole percent on the oxide basis, of about 60-76% SiO2, 15-30% K2 O, and 2-15% total of at least one metal oxide selected from the group of 0-10% Al2 O3, 0-5% V2 O5, 0-5% TiO2, 0-5% MoO3, and 0-5% WO3.
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Abstract
The present invention is concerned with the preparation of hydraulic cements, demonstrating high mechanical strength, long term resistance to attack by moisture, and virtual freedom from creep, from glass powders consisting essentially, expressed in terms of mole percent on the oxide basis, of about 60-76% SiO2, 15-30% K2 O, and 2-15% total of at least one metal oxide selected from the group of 0-10% Al2 O3, 0-5% V2 O5, 0-5% TiO2, 0-5% MoO3 and 0-5% WO3. The cements exhibit particular utility in forming strong cellular ceramic articles. The glass powders may contain a phosphate component in which case the composition ranges are limited to 68-76% SiO2, 18-24% K2 O, 2-4.5% P2 O5 with the molar ratio K2 O:P2 O5 ranging between 5 and 10, and 2-5% total of at least one metal oxide selected from the group of Al2 O3, MoO3, V2 O5 and WO3.
30 Citations
14 Claims
- 1. A hydraulic cement exhibiting high mechanical strength, long term durability against attack by water, and, after curing, essential freedom from creep, said cement composed of glass powders consisting essentially, expressed in terms of mole percent on the oxide basis, of about 60-76% SiO2, 15-30% K2 O, and 2-15% total of at least one metal oxide selected from the group of 0-10% Al2 O3, 0-5% V2 O5, 0-5% TiO2, 0-5% MoO3, and 0-5% WO3.
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7. A method for preparing a body of hydraulic cement exhibiting high mechanical strength, long term durability against attack by water, and essential freedom from creep which comprises the steps of:
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(a) melting a batch for a glass consisting essentially, expressed in terms of mole percent on the oxide basis, of about 60-76% SiO2, 15-30% K2 O, and 2-15% total of at least one metal oxide selected from the group of 0-10% Al2 O3, 0-5% V2 O5, 0-5% TiO2, 0-5% MoO3, and 0-5% WO3. (b) cooling said melt to a glass body; (c) reducing said glass body to a powder passing a No. 100 United States Standard Sieve; (d) admixing water to said glass powder at temperatures between the freezing and boiling point of the water in powder-to-water weight ratios ranging between about 1;
2-4;
1; and
thereafter(e) maintaining said mixture within said temperature range for a period of time sufficient to cure same to a solid body. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification