FAST SETTING HYDRAULIC CEMENTS FROM GLASS POWDERS

• US 3,720,527 A
• Filed: 04/15/1971
• Issued: 03/13/1973
• Est. Priority Date: 04/15/1971
• Status: Expired due to Term

• Current Assignee: Robert J. Farrauto, William L. Haynes
• Original Assignee: Robert J. Farrauto, William L. Haynes
• Inventors: Farrauto, Robert J., Haynes, William L.
• Primary Examiner(s): Poer, James L.
• Application Number:
  US05/134,409
• Time in Patent Office: 698 Days
• Field of Search: 106/74,85,52
• US Class Current: 106/629
• CPC Class Codes: C03C 3/062 with less than 40% silica by weight
• CPC Class Codes: C03C 3/097 containing phosphorus, niobium or tantalum
• CPC Class Codes: C04B 7/00 Hydraulic cements calcium sulfate cements C04B11/00

Abstract

The present invention is concerned with the production of strong amorphous hydraulic cements from glass powders in the general composition field R2O-SiO2-P2O5, wherein R2O consists of Na2O and/or K2O, which are relatively very fast setting, i.e., have setting times normally less than one hour. More specifically, the glass powders operable in this invention consists essentially, by weight on the oxide basis, of about 15-85% R2O, 10-80% SiO2, and 3-20% P2O5.

Claims

1. A hydraulic cement composed of glass powders consisting essentially, by weight on the oxide basis, of about 15-85% R2O, wherein R2O consists of Na2O and/or K2O, 3-20% P2O5, and 10-80% SiO2.

2. A hydraulic cement according to claim 1 wherein said glass powders consist essentially, by weight on the oxide basis, of about 25-80% R2O, wherein R2O consists of Na2O and/or H2O, 5-20% P2O5, and 35-70% SiO2.

3. A method for making a body of hydraulic cement which comprises:

a. melting a batch for a glass consisting essentially, by weight on the oxide basis, of about 15-85% R2O, wheRein R2O consists of Na2O and/or K2O, 3-20% P2O5, and 10-80% SiO2;

b. cooling said melt to a glass body;

c. reducing said glass body to a powder passing through a 140 mesh screen;

d. admixing water to said glass powder at temperatures between the freezing and boiling points of the water in water-to-powder weight ratios ranging between about 0.25-0.50; and

e. maintaining said mixture within said temperature range for a period of time sufficient to cure same to a solid body.

4. A method for making a body of hydraulic cement according to claim 3 wherein said batch consists essentially, by weight on the oxide basis, of about 25-80% R2O, wherein R2O consists of Na2O and/or K2O, 5-20% P2O5, and 35-70% SiO2.

5. A method for making a body of hydraulic cement according to claim 3 wherein said solid body is heated to temperatures in the vicinity of 150*-200*C. for a period of time sufficient to expel absorbed water.