Concrete composition

Patent metadata

Field	Value
Publication number	US-10308554-B2
Application number	US-201615576179-A
Country	US
Kind code	B2
Filing date	May 18, 2016
Priority date	May 26, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

The concrete composition includes, in a mixture with water, a hydraulic binder, sand and aggregates, wherein the hydraulic binder includes a Portland cement of high reactivity, and the hydraulic binder is present in an amount of 280-340 kg per cubic meter of concrete, a shrinkage reducing admixture is present in an amount of 0-4 L per cubic meter of concrete, and water is present in an amount of 140-160 L per cubic meter of concrete.

First claim

The invention claimed is:

1. A concrete composition comprising, in a mixture with water, a hydraulic binder, sand and aggregates, wherein the hydraulic binder comprises a Portland cement of high reactivity, wherein the Portland cement has a Blaine fineness of 4500-6500 cm 2 /g, characterized in that the hydraulic binder is present in an amount of 280-310 kg per cubic meter of concrete, that a shrinkage reducing admixture is present in an amount of 3-4 L per cubic meter of concrete, wherein the shrinkage reducing admixture is an organic admixture, and that water is present in an amount of 140-160 l per cubic meter of concrete.

2. A concrete composition according to claim 1 , wherein the reactivity of the hydraulic binder is selected so as to obtain a 28d compressive strength of the concrete of >52.5 MPa.

3. A concrete composition according to claim 1 , wherein the reactivity of the hydraulic binder is selected so as to obtain a 1d compressive strength of the concrete of >20 MPa.

4. A concrete composition according to claim 1 , wherein the hydraulic binder comprises a supplementary cementitious material.

5. A concrete composition according to claim 4 , wherein the supplementary cementitious material is present in an amount of 1-20 wt.-% of the hydraulic binder.

6. A concrete composition according to claim 4 , wherein the supplementary cementitious material has a Blaine fineness of 4500-6500 cm 2 /g.

7. A concrete composition according to claim 1 , further comprising an expanding agent in an amount of 0.5-3 wt. % of the hydraulic binder.

8. A concrete composition according to claim 1 , further comprising a water reducing agent.

9. A concrete composition according to claim 8 , wherein the water reducing agent comprises poly-carboxylate ether or polynaphthalene sulfonate.

10. A concrete composition according to claim 1 , wherein the concrete composition is freshly mixed and the amount of water and hydraulic binder is selected so as to reach a flow of the freshly mixed concrete at 10 min of at least 100 mm+/−10 mm.

11. A concrete composition according to claim 1 , wherein within less than 50 days after placing the concrete has a relative humidity of 80% according to ASTM F2170.

12. A concrete composition according to claim 1 , wherein the shrinkage reducing admixture is based on polypropylene glycol, polyethylene glycol and/or a glycol ether derivative, and is, optionally, in a liquid mixture with surfactants.

13. A concrete composition according to claim 4 , wherein the hydraulic binder comprises, as the supplementary cementitious material, ground granulated blast furnace slag, fly ash, pozzolans, ground limestone or mixtures thereof.

14. A concrete composition according to claim 7 , wherein the expanding agent comprises CaO.

15. A concrete composition according to claim 8 , wherein the water reducing agent, is present in an amount between 0.4 and 1 wt. % of the hydraulic binder.

16. A concrete composition according to claim 1 , wherein within less than 40 days after placing the concrete has a relative humidity of 80% according to ASTM F2170.

17. A concrete composition according to claim 1 , wherein within less than 30 days after placing the concrete has a relative humidity of 80% according to ASTM F2170.

18. A construction element comprising concrete obtained from a concrete mix composition according to claim 1 .

Assignees

• Holcim Technology Ltd

Inventors

• Babayan David
• Baalbaki Moussa
• Gong Bill

Classifications

• C04B22/064

  of the alkaline-earth metals · CPC title

• C04B2111/60

  Flooring materials · CPC title

• C04B24/32

  Polyethers, e.g. alkylphenol polyglycolether · CPC title

• C04B24/2611

  Polyalkenes · CPC title

• C04B2201/50

  for the mechanical strength · CPC title