Desert sand and filamentous cellulose in concrete and mortar

Patent metadata

Field	Value
Publication number	US-11708304-B2
Application number	US-201916967437-A
Country	US
Kind code	B2
Filing date	Feb 12, 2019
Priority date	Feb 13, 2018
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

The present provides a concrete and mortar mix and composition thereof with poor quality sand such as desert sand, hydraulic binder (cement) and filamentous cellulose, where the desert sand/spherical sand replaces conventional concrete river sands. The present disclosure also relates a filamentous cellulose, such as, cellulose filaments (CF), cellulose nano filaments, cellulose nanofibrils (CNF) and microfibrillated cellulose (MFC) as a concrete/mortar and sand adhesion additive with hydraulic binder (cement), and to a method of making the concrete. This method also relates to a method to prevent the sliding of individual sand grains against one another and therefor similarly contributes to the stabilization of the building materials.

First claim

The invention claimed is:

1. A concrete composition comprising:
a) a hydraulic binder;
b) a superfine sand, wherein said superfine sand is a sand with a fineness modulus below 2.11 as classified according to ASTM C136-01, or a sand with a fineness modulus below 1.5 as classified according to GB/T14684-2001;
c) a filamentous cellulose, wherein the filamentous cellulose is a cellulose filament (CF), cellulose nano filaments, a cellulose nanofibril (CNF) or a microfibrillated cellulose (MFC); and
d) a sand with a fineness modulus over 2.9 as classified according to ASTM C136-01.

2. The composition of claim 1 , wherein the superfine sand is a desert sand or an Ottawa sand.

3. The composition of claim 2 , wherein the desert sand is Yellow desert sand, dune sand, Qatar desert sand, Gobi desert sand, red desert sand, black desert sand, or a combination thereof.

4. The composition of claim 1 , wherein the filamentous cellulose has an average length up to 2 mm, and an average width of from 3 nm to 500 nm.

5. The composition of claim 1 , wherein the hydraulic binder is selected from the group consisting of a Portland cement, a high alumina cement, a lime cement, a kiln dust cement, a high phosphate cement, a ground granulated blast furnace slag cement, a fly ash, a lime, a gypsum and combinations thereof.

6. The composition of claim 1 , wherein the hydraulic binder is a Portland cement.

7. The composition of claim 1 , wherein the filamentous cellulose to hydraulic binder is in a weight % of less than 5% by weight of the hydraulic binder.

8. The composition of claim 1 , wherein the filamentous cellulose weight % to the hydraulic binder is in a range from 0.001% to 5% by weight.

9. The composition of claim 1 , further comprising a coarse aggregate.

10. The composition of claim 9 , wherein the coarse aggregate is gravel, silicate, a clay, a metal oxide, a metal hydroxide, or a mixture thereof.

11. The composition of claim 9 , wherein the coarse aggregate is in a range of average particles sizes of 5 mm to 40 mm.

12. The composition of claim 1 , wherein the sand with a fineness modulus over 2.9 is a natural sand.

13. The composition of claim 12 , wherein the natural sand is a river sand, a river bank sand, a beach sand, or a combination thereof.

14. The composition of claim 1 , wherein the sand with a fineness modulus over 2.9 is a Lafarge sand.

15. The composition of claim 1 , wherein said composition is a concrete/mortar mix, a concrete mix, a mortar mix, a mortar composition, or a concrete/mortar sand adhesion additive.

16. A method of preparing the concrete composition of claim 1 comprising:
providing the hydraulic binder;
providing the superfine sand, wherein said superfine sand is a sand with a fineness modulus below 2.11 as classified according to ASTM C136-01, or a sand with a fineness modulus below 1.5 as classified according to GB/T14684-2001;
providing the filamentous cellulose, wherein the filamentous cellulose is a cellulose filament (CF), cellulose nano filaments, a cellulose nanofibril (CNF) or a microfibrillated cellulose (MFC);
providing the sand, with a fineness modulus over 2.9 as classified according to ASTM C136-01, and
mixing said sand, the hydraulic binder, the superfine sand, and the filamentous cellulose,
wherein the filamentous cellulose creates a network adhering to the hydraulic binder and the superfine sand.

17. The method of claim 16 , further comprising adding a coarse aggregate.

Assignees

• Fpinnovations
• Fpinnovation

Inventors

• Olivier Eric
• Cai Xiaolin
• Larouche Carole
• Wang Xiaoyu

Classifications

• C04B18/24 Primary

  Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper {, cork} · CPC title

• C04B14/068 Primary

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

• C04B28/04

  Portland cements · CPC title

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title

• C04B28/08

  Slag cements · CPC title