AGGREGATE CONTAINING A TREATMENT AGENT FOR IMPROVING CONCRETE PROPERTIES

• US 3,650,784 A
• Filed: 08/11/1970
• Issued: 03/21/1972
• Est. Priority Date: 08/11/1970
• Status: Expired due to Term

• Current Assignee: John H. Hoge, Robert J. Albert
• Original Assignee: John H. Hoge, Robert J. Albert
• Inventors: Albert, Robert J., Hoge, John H.
• Primary Examiner(s): Levow, Tobias E.
• Assistant Examiner(s): Scott, W. T.
• Application Number:
  US05/063,022
• Time in Patent Office: 588 Days
• Field of Search: 106/90,97,314 259/147
• US Class Current: 106/672
• CPC Class Codes: C04B 20/10 Coating or impregnating roofing granules E04D7/005

Abstract

The internal capillary and pore spaces of porous lightweight aggregate are filled with a solution or suspension of a treating agent capable of improving at least one physical property of concrete. When this treated aggregate is used in the conventional manner in mixing and placing concrete, a treating agent remains absorbed within the aggregate and does not emerge to react or deposit in the concrete matrix until the moist curing, normally given to concrete, is terminated and the cast begins to dry. The treating agent is thus uniformly released throughout the interior of the cast at any time that is selected as optimum in the cement crystallization cycle for the particular property improvement sought in contrast to the relatively shallow penetration achieved by externally wetting the cast with such agents as in present art. A variety of organic and inorganic agents, many not heretofore usable by the conventional methods, can be incorporated in concrete to improve physical properties such as compressive, tensile and flexural strength, impermeability, freeze/thaw resistance and the like. Agents that would be rendered ineffective if introduced during mixing or in the early stages of hydration can now be utilized by this novel process.

Claims

2. A method in accordance with the method of Claim 1 wherein said aggregate is utilized in said concrete mix by mixing therewith and said concrete mix coMprises cement, sand and mixing water along with said aggregate.

3. A method in accordance with the method of claim 2 wherein said concrete mix further comprises a second treating agent reactive with said first-mentioned treating agent.

4. A method in accordance with the method of claim 2 wherein said filling of said interior spaces is carried out by replacing gases in said interior spaces by surrounding said porous lightweight aggregate with said liquid.

5. A method in accordance with the method of claim 4 wherein said replacing is carried out by exposing said aggregate to a vacuum.

6. A method in accordance with the method of claim 2 wherein said liquid is water.

7. A method in accordance with the method of claim 5 wherein said treating agent is selected from the group consisting of metal salts of silicates, carbonates, bicarbonates, chlorides and sulfates.

8. A method in accordance with the method of claim 5 wherein said treating agent is an organic material.

9. A method in accordance with the method of claim 5 wherein said treating agent is a metallic silicate soluble in said liquid.

10. A method in accordance with the method of claim 5 wherein said treating agent is a metallic carbonate soluble in said liquid.

11. A method in accordance with the method of claim 5 wherein said treating agent is a metallic bicarbonate soluble in said liquid.

12. A method in accordance with the method of claim 5 wherein said treating agent is a metallic chloride.

13. A method in accordance with the method of claim 5 wherein said treating agent is a metallic sulfate soluble in said liquid.

14. A method in accordance with the method of claim 2 wherein said treating agent is in a solution with said liquid.

15. A method for improving a physical property of concrete, said method comprising, wetting a porous lightweight aggregate with a liquid so as to fill interior spaces in said porous lightweight aggregate and said liquid carrying a treating agent for improving a physical property of concrete, mixing the resulting lightweight aggregate in a concrete mix comprising sand, cement and mixing water, casting and curing said concrete mix, and permitting said concrete to dry to cause said liquid and treating agent to pass out of said interior spaces of said porous lightweight aggregate whereby said physical property is enhanced.

16. A porous lightweight aggregate for use in concrete, said porous aggregate having a plurality of internal spaces, said spaces being filled with a liquid carrying a treating agent for improving physical properties of concrete.

17. A porous lightweight aggregate in accordance with claim 16 wherein said liquid is water.

18. A porous lightweight aggregate in accordance with claim 17 wherein said treating agent is selected from the group consisting of metal salts of silicates, carbonates, bicarbonates, chlorides and sulfates.

19. A porous lightweight aggregate in accordance with claim 17 wherein said treating agent is an organic material.

20. A method in accordance with the method of claim 4 wherein said treating agent is an organic material.

21. A method in accordance with the method of claim 4 wherein said treating agent is a metallic silicate soluble in said liquid.

22. A method in accordance with the method of claim 4 wherein said treating agent is a metallic carbonate soluble in said liquid.

23. A method in accordance with the method of claim 4 wherein said treating agent is a metallic bicarbonate soluble in said liquid.

24. A method in accordance with the method of claim 4 wherein said treating agent is a metallic chloride.

25. A method in accordance with the method of claim 4 wherein said treating agent is a metallic sulfate soluble in said liquid.

26. A porous lightweight aggregate in accordance with claim 16 wherein said treating agent is a metallic silicate soluble in said liquid.

27. A porous lightweight aggregate in accOrdance with claim 16 wherein said treating agent is a metallic carbonate soluble in said liquid.

28. A porous lightweight aggregate in accordance with claim 16 wherein said treating agent is a metallic bicarbonate soluble in said liquid.

29. A porous lightweight aggregate in accordance with claim 16 wherein said treating agent is a metallic chloride.

30. A porous lightweight aggregate in accordance with claim 16 wherein said treating agent is a metallic sulfate soluble in said liquid.

31. A method in accordance with the method of claim 4 wherein said porous lightweight aggregate is heated to temperatures of from 350* to 600* F. and is then surrounded by said liquid whereby said interior spaces are filled.