Biomass waste materials as a set-retardation agent in cement or concrete

Patent metadata

Field	Value
Publication number	US-11851371-B2
Application number	US-202117387452-A
Country	US
Kind code	B2
Filing date	Jul 28, 2021
Priority date	Jul 29, 2020
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A concrete mixture is provided. The mixture includes cement powder, a plant biomaterial in a solid form, wherein the plant biomaterial does not comprise ash, and concrete aggregate, wherein a ratio of cement powder to the biomaterial ranges from 10:1 to 100:1. Methods of controlling concrete setting by adding a plant biomaterial in a solid form to a concrete mixture are also provided.

First claim

We claim:

1. A concrete mixture, comprising:
cement powder;
a plant biomaterial in a solid form, wherein the plant biomaterial does not comprise ash and wherein the plant biomaterial has been treated with an alkaline extraction agent and washed with water after treatment with the alkaline extraction agent; and
concrete aggregate,

wherein a ratio of cement powder to the biomaterial ranges from 10:1 to 100:1.

2. The concrete mixture of claim 1 , wherein the ratio of cement powder to the plant biomaterial ranges from 10:1 to 25:1.

3. The concrete mixture of claim 1 , wherein the plant biomaterial is obtained from a plant selected from the group consisting of hemp, kenaf, and combinations thereof.

4. The concrete mixture of claim 1 , wherein the plant biomaterial is obtained from a plant part selected from the group consisting of a stalk, stem, flowering material, hurd, bast, and combinations thereof.

5. The concrete mixture of claim 1 , wherein the solid form is selected from the group consisting of powder, chips, fibers, and nanoparticles.

6. The concrete mixture of claim 1 , wherein the mixture further comprises one or more materials selected from siliceous or calcareous fly ash, slag cement, and silica fume.

7. The concrete mixture of claim 1 , further comprising at least a portion of the alkaline extraction agent used to treat the plant biomaterial.

8. The concrete mixture of claim 1 , further comprising at least a portion of the water used to wash the plant biomaterial.

9. A method of controlling concrete setting, comprising adding a plant biomaterial in a solid form to a concrete mixture, wherein the plant biomaterial does not comprise ash and wherein the plant biomaterial is treated with an alkaline extraction agent prior to being added to the concrete mixture and washed with water after being treated with the alkaline extraction agent.

10. The method of claim 9 , wherein a ratio of cement powder to the biomaterial ranges from 10:1 to 100:1.

11. The method of claim 9 , wherein the plant biomaterial is obtained from a plant selected from the group consisting of hemp, kenaf, and combinations thereof.

12. The method of claim 9 , wherein the plant biomaterial is obtained from a plant part selected from the group consisting of a stalk, stem, flowering material, hurd, bast, and combinations thereof.

13. The method of claim 9 , wherein the solid form is selected from the group consisting of powder, chips, fibers, and nanoparticles.

14. The method of claim 9 , further comprising adding one or more materials selected from siliceous or calcareous fly ash, slag cement, and silica fume.

15. The method of claim 9 , wherein at least a portion of the alkaline extraction agent used to treat the plant biomaterial is added to the concrete mixture.

16. The method of claim 9 , wherein at least a portion of the water used to wash the plant biomaterial is added to the concrete mixture.

Assignees

• Univ Louisville Res Found Inc

Inventors

• Sun Zhihui
• Sathitsuksanoh Noppadon
• Qi Chengqing

Classifications

• C04B18/248 Primary

  from specific plants, e.g. hemp fibres · CPC title

• C04B18/021

  agglomerated by a mineral binder, e.g. cement · CPC title

• C04B18/146

  Silica fume · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B28/08

  Slag cements · CPC title