Concrete composition

Patent metadata

Field	Value
Publication number	US-10669204-B2
Application number	US-201615573999-A
Country	US
Kind code	B2
Filing date	May 12, 2016
Priority date	May 15, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A concrete composition having, in a mixture with water, a hydraulic binder, sand, aggregates, an expanding agent and a shrinkage reducing admixture, wherein the expanding agent is calcium oxide having a low reactivity such that the concrete casted using the composition does not expand by more than 0.05 vol. % during the first 10 days, preferably not expanding more than 0.05 vol. % during the first 7 days, after having been cast.

First claim

The invention claimed is:

1. A concrete composition that is
(a) a concrete composition comprising, in a mixture with water, a hydraulic binder, sand, aggregates, an expanding agent, and a shrinkage reducing admixture, wherein the expanding agent is calcium oxide having a low reactivity wherein the concrete does not expand by more than 0.05 vol. %, during the first 10 days, after having been casted; or
(b) a concrete composition comprising, in a mixture with water, a hydraulic binder, sand, aggregates, an expanding agent, and a shrinkage reducing admixture, wherein the expanding agent is calcium oxide having a low reactivity wherein the concrete does not expand by more than 0.05 vol. %, during the first 7 days, after having been casted,
wherein the concrete composition of (a) and the concrete composition of (b) satisfy at least one of the following:
(i) the calcium oxide has a reactivity that is characterized by a conductivity of <11 mS/cm when dissolved in water,
(ii) the calcium oxide has a reactivity that is characterized by an average temperature increase of <0.5° C./min during the first 15 minutes after the addition of the calcium oxide into water, or
(iii) the calcium oxide has a reactivity that is characterized by a temperature increase of <10° C. during the first 5 minutes after the addition of the calcium oxide into water.

2. The concrete composition according to claim 1 , wherein the calcium oxide has a particle size distribution characterized by a residue of at least 6 wt. % on a 45 μm mesh sieve.

3. The concrete composition according to claim 1 , wherein the hydraulic binder comprises ordinary Portland cement and optionally supplementary cementitious material.

4. The concrete composition according to claim 1 , wherein the shrinkage reducing admixture is an organic admixture.

5. The concrete composition according to claim 1 , wherein the mixture further comprises a water reducing agent in an amount of 20-60 ml/100 kg hydraulic binder.

6. The concrete composition according to claim 1 , wherein the volume change of the concrete is between +0.01 and −0.01 vol. % after 365 days after having been casted.

7. The concrete composition according to claim 1 , wherein the concrete composition contains the expanding agent in an amount of 2-6 wt. % of the hydraulic binder.

8. The concrete composition according to claim 1 , wherein the concrete composition contains the shrinkage reducing admixture in an amount of 1-2 wt. % of the hydraulic binder.

9. The concrete composition according to claim 1 , wherein the concrete composition has a water/binder ratio is 0.15-0.50.

10. The concrete composition according to claim 1 , wherein the hydraulic binder is present in an amount of 280-700 kg per cubic meter of concrete.

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

12. The concrete composition according to claim 1 , wherein
when the concrete composition is (a), the expanding agent is calcium oxide having a low reactivity, and wherein the concrete does not expand by more than 0.03 vol. % during the first 10 days; or
when the concrete composition is (b), the expanding agent is calcium oxide having a low reactivity, and wherein the concrete does not expand by more than 0.03 vol. % during the first 7 days.

13. The concrete composition according to claim 3 , wherein the optionally supplementary cementitious material comprises granulated blast furnace slag, fly ash, pozzolans or mixtures thereof.

14. The concrete composition according to claim 5 , wherein the water reducing agent comprises a polycarbonate ether based plasticizer admixture or a polynaphthalene sulfonate based plasticizing admixture.

15. The concrete composition according to claim 4 , wherein the shrinkage reducing admixture is an organic admixture based on polypropylene glycol, polyethylene glycol and/or a glycol ether derivative, optionally in a liquid mixture with surfactants.

16. The concrete composition according to claim 1 , wherein the concrete composition of (a) satisfies (i), (ii) and (iii).

17. The concrete composition according to claim 1 , wherein the concrete composition of (b) satisfies (i), (ii) and (iii).

Assignees

• Holcim Technology Ltd

Inventors

• Baalbaki Moussa
• Gong Bill
• Babayan David
• Matthes Winnie

Classifications

• C04B2111/346

  Materials exhibiting reduced plastic shrinkage cracking · CPC title

• C04B22/064

  of the alkaline-earth metals · CPC title

• C04B14/06

  Quartz; Sand · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B24/02

  Alcohols; Phenols; Ethers · CPC title