Green concrete kit composed of four components

Patent metadata

Field	Value
Publication number	US-11993544-B1
Application number	US-202318534529-A
Country	US
Kind code	B1
Filing date	Dec 8, 2023
Priority date	Dec 8, 2023
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

A green concrete composition comprising: a binder component comprising Portland cement (C), volcanic ash (VA), metakaolin (MK), and colloidal nano-silica (CNS); an aggregate component comprising fine aggregates (FA) and coarse aggregates (CA); water (W); and a super plasticizer.

First claim

We claim:

1. A green concrete composition comprising:
a binder component comprising Portland cement (C), volcanic ash (VA), metakaolin (MK), and colloidal nano-silica (CNS);
an aggregate component comprising fine aggregates (FA) and coarse aggregates (CA);
water (W); and
a super plasticizer, wherein the Portland cement, the volcanic ash, and the metakaolin have a BET surface area of about 0.374 m 2 /g, about 0.356 m 2 /g, and about 12.507 m 2 /g, respectively.

2. The green concrete of claim 1 , wherein each 1 m 3 of the green concrete comprises 533 kg of the binder component, 1732 kg of the aggregate component; 160 kg of the water; and 6-8 kg of the super plasticizer.

3. The green concrete of claim 1 , wherein each 1 m 3 of the green concrete comprises 373 kg of the Portland cement, 133 kg of the volcanic ash, 16 kg of the colloidal nano-silica, 11 kg of the metakaolin, 1039 kg of the coarse aggregates, 693 kg of the fine aggregates, 160 kg of the water, and 6.7 kg of the super plasticizer.

4. The green concrete of claim 1 , wherein each 1 m 3 of the green concrete comprises 266.5 kg of the Portland cement, 213 kg of the volcanic ash, 32 kg of the colloidal nano-silica, 21 kg of the metakaolin, 1039 kg of the coarse aggregates, 693 kg of the fine aggregates, 160 kg of the water, and 8 kg of the super plasticizer.

5. The green concrete of claim 1 , wherein each 1 m 3 of the green concrete comprises 373 kg of the Portland cement, 133 kg of the volcanic ash, 11 kg of the colloidal nano-silica, 16 kg of the metakaolin, 1039 kg of the coarse aggregates, 693 kg of the fine aggregates, 160 kg of the water, and 6.4 kg of the super plasticizer.

6. The green concrete of claim 1 , wherein each 1 m 3 of the green concrete comprises 266.5 kg of the Portland cement, 213 kg of the volcanic ash, 21 kg of the colloidal nano-silica, 32 kg of the metakaolin, 1039 kg of the coarse aggregates, 693 kg of the fine aggregates, 160 kg of the water, and 7.5 kg of the super plasticizer.

7. The green concrete of claim 3 , wherein the green concrete has a compressive strength of about 69.9 MPa, about 88.5 MPa, about 104.1 MPa, and about 106.2 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively.

8. The green concrete of claim 3 , wherein the green concrete has a rapid chloride penetration of about 273 Coulombs and about 78 Coulombs after aging for about 91 days and about 365 days, respectively.

9. The green concrete of claim 3 , wherein the green concrete has a water absorption of about 2.52% and about 1.86% after aging for about 91 days and about 365 days, respectively.

10. The green concrete of claim 5 , wherein the green concrete has a compressive strength of about 71.5 MPa, about 87.4 MPa, about 107.7 MPa, and about 106.2 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively.

11. The green concrete of claim 5 , wherein the green concrete has a rapid chloride penetration of about 337 Coulombs and about 35 Coulombs after aging for about 91 days and about 365 days, respectively.

12. The green concrete of claim 5 , wherein the green concrete has a water absorption of about 2.58% and about 2.00% after aging for about 91 days and about 365 days, respectively.

13. The green concrete of claim 4 , wherein the green concrete has a compressive strength of about 61.9 MPa, about 83.2 MPa, about 91.4 MPa, and about 96.1 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively.

14. The green concrete of claim 4 , wherein the green concrete has a rapid chloride penetration of about 269 Coulombs and about 39 Coulombs after aging for about 91 days and about 365 days, respectively and a water absorption of about 2.19% and about 2.09% after aging for about 91 days and about 365 days, respectively.

15. The green concrete of claim 6 , wherein the green concrete has a compressive strength of about 57.7 MPa, about 78.2 MPa, about 85.2 MPa, and about 92.7 MPa after aging for about 7 days, about 28 days, about 91 days, and about 365 days, respectively.

16. The green concrete of claim 6 , wherein the green concrete has a rapid chloride penetration of about 303 Coulombs and about 30 Coulombs after aging for about 91 days and about 365 days, respectively, and a water absorption of about 2.37% and about 2.01% after aging for about 91 days and about 365 days, respectively.

17. The green concrete of claim 1 , wherein the fine aggregates comprise dune silica sand, the coarse aggregates comprise crushed limestone, and the super plasticizer comprises polycarboxylate ethers.

18. The green concrete of claim 1 , wherein the colloidal nano-sized silica particles have a density of about 1.4 g/cm 3 , a pH of about 9.5, a viscosity of about 8 cP, about 50% by weight of silica, a diameter of about 35 nm to about 75 nm, and a specific surface area of about 80 m 2 /g.

Assignees

• Univ King Faisal

Inventors

• Khan Kaffayatullah
• Amin Muhammad Nasir
• Johari Megat Azmi Megat

Classifications

• C04B2111/00017

  Aspects relating to the protection of the environment · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B28/24 Primary

  containing alkyl, ammonium or metal silicates; containing silica sols {(reaction mixtures resulting in mineral polymers C04B28/006; polymeric reaction products of alkali metal silicates with isocyanates C08G18/3895)} · CPC title

• C04B14/068

  Specific natural sands, e.g. sea -, beach -, dune - or desert sand · CPC title