Glass formula for avoiding ASR

• US 5,803,960 A
• Filed: 01/17/1997
• Issued: 09/08/1998
• Est. Priority Date: 01/17/1997
• Status: Expired due to Fees

• Current Assignee: TRUSTEES OF COLUMBIA, THE
• Original Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Inventors: Baxter, Steven Z.
• Primary Examiner(s): GREEN, ANTHONY J
• Application Number:
  US08/784,046
• Time in Patent Office: 599 Days
• Field of Search: 106/711, 106/716, 106/737, 106/814
• US Class Current: 106/711
• CPC Class Codes: C03C 13/001 Alkali-resistant fibres
• CPC Class Codes: C03C 4/20 for chemical resistant glass
• CPC Class Codes: C04B 14/22 Glass ; Devitrified glass
• CPC Class Codes: C04B 14/42 Glass
• CPC Class Codes: C04B 2103/0008 Li
• CPC Class Codes: C04B 2103/603 Agents for controlling alkali-aggregate reactions
• CPC Class Codes: C04B 2111/10 Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
• CPC Class Codes: C04B 2111/80 Optical properties, e.g. transparency or reflexibility
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates

Abstract

The present invention relates generally to a glass formula for incorporation in glass/concrete compositions. The glass contains lithium. Alkali-silica reaction is avoided in the glass/concrete compositions.

Claims

1. An ASR-resistant set glass/concrete composition which comprises lithium glass particles dispersed in concrete, wherein said lithium glass particles have an average diameter of less than 0.5 mm and comprise a sufficient amount of lithium to suppress alkali-silica reaction between the concrete and a silica-containing concrete aggregate additive, wherein the lithium glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

3. An ASR-resistant set glass/concrete composition according to claim 1, wherein the lithium glass particles contain trace amounts of zirconium.

5. An ASR-resistant set glass/concrete composition according to claim 1, wherein the lithium glass particles have a clear color.

7. An ASR-resistant set glass/concrete composition according to claim 1, wherein the lithium glass particles are fibers.

11. An ASR-resistant set glass/concrete composition according to claim 1, wherein the lithium glass particles comprise soda lime glass comprising from 1.25% to 2% by weight of lithium oxide.

12. An ASR-resistant set glass/concrete composition according to claim 1, wherein the composition comprises cement and from 0.5% by weight to 50% by weight lithium glass particles by weight of cement.

2. An ASR-resistant set glass/concrete composition which comprises lithium glass particles dispersed in concrete, wherein said lithium glass particles have an average diameter of greater than 0.5 mm and comprise an amount of lithium effective to cause suppression of alkali-silica reaction between the concrete and the lithium glass particles, wherein the lithium glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

4. An ASR-resistant set glass/concrete composition according to claim 2, wherein the lithium glass particles contain trace amounts of zirconium.

6. An ASR-resistant set glass/concrete composition according to claim 2, wherein the lithium glass particles have a clear color.

8. An ASR-resistant set glass/concrete composition according to claim 2, wherein the lithium glass particles are fibers.

9. An ASR-resistant set glass/concrete composition according to claim 2, wherein the lithium glass particles comprise soda lime glass comprising from 1.25% to 2% by weight of lithium oxide.

10. An ASR-resistant-set glass/concrete composition according to claim 2, wherein the lithium glass particles comprise more than 0.75% by weight lithium oxide.

13. An ASR-resistant set glass/concrete composition according to claim 2, wherein the composition optionally further comprises an aggregate material and wherein the combination of aggregate material and lithium glass particles comprises from 0.5% by weight to 100% by weight lithium glass particles.

14. A process for making an ASR-resistant set glass/concrete composition which comprises mixing cement, water, a silica-containing concrete aggregate and lithium glass particles having an average diameter of less than 0.5 mm and comprising an amount of lithium effective to cause suppression of alkali-silica reaction between the concrete and the aggregate, wherein the lithium glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

18. A process according to claim 14, wherein the glass comprises from 0.25% to 2% by weight of lithium oxide.

19. A process according to claim 14, wherein the lithium glass particles are fibres.

15. A process for making an ASR-resistant set glass/concrete composition which comprises mixing cement, water, and lithium glass particles having an average diameter of greater than 0.5 mm and comprising an amount of lithium effective to cause suppression of alkali-silica reaction between the concrete and the glass particles, wherein the glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

16. A process according to claim 15, wherein the glass comprises soda lime glass comprising from 1.25% to 2% by weight of lithium oxide.

17. A process according to claim 15, wherein the glass comprises more than 0.75% by weight lithium oxide.

20. A process according to claim 15, wherein the lithium glass particles are fibres.

21. An ASR-resistant set glass-concrete composition which comprises a product formed by mixing together water, cement, a silica-containing concrete aggregate additive, and lithium glass particles having an average diameter of less than 0.5 mm and which comprise a sufficient amount of lithium to suppress alkali-silica reaction with the silica-containing concrete aggregate additive, wherein the lithium glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

23. An ASR-resistant set glass/concrete composition according to claim 21, wherein the lithium glass particles are fibers.

22. An ASR-resistant set glass/concrete composition which comprises a product formed by mixing together a glass/concrete precursor mixture comprising water, cement, a silica-containing concrete aggregate additive, and lithium glass particles having an average diameter of greater than 0.5 mm and which comprise a sufficient amount of lithium to cause suppression of alkali-silica reaction between the concrete and the lithium glass particles, wherein the lithium glass particles do not contain an amount of zirconium which is sufficient to impart enhanced alkali resistant properties to the glass particles.

24. An ASR-resistant set glass/concrete composition according to claim 22, wherein the lithium glass particles are fibers.