Preparation of graphene nanosheets-based concrete additive

Inventors: Venkata Ramana Gedela (Hyderabad, IN); Ravi Nuguru (Hyderabad, IN); Chinthakuntla Ashok (Nalgonda, IN); Edulakanti Sai Ram (Medchal-Malkajgiri, IN); Jella Praveen Kumar (Nalgonda, IN)

Assignee: Nanospan India Private Limited

C04B40/0046 C04B14/026 C04B24/2647 C04B2103/20 C04B2103/304

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Quick Facts

Patent No.: US 12679780
App. No.: 18/056,734
Granted: Jul 14, 2026
Kind: B2

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Abstract

A method for preparing a graphene-nanosheets based concrete additive is disclosed. The method comprises mixing Polycarboxylate ether A (PCE-A) to a retarder-based salt solution to obtain a retarder-based Polycarboxylate ether A solution. In the next step, a retarder based PCE solution is obtained by adding Polycarboxylate ether B to the retarder based Polycarboxylate ether A solution to which graphene nanosheets are added. Further, an air entrainment agent is added to graphene nanosheets based PCE solution and further mixed to obtain the graphene nanosheets based concrete additive.

Claims (26)

1 . A method for preparing graphene-nanosheets based concrete additive, the method comprising:

a) mixing Polycarboxylate ether-A (PCE-A) to a retarder-based salt solution to obtain a retarder-based Polycarboxylate ether-A (PCE-A) solution;

b) adding Polycarboxylate ether-B (PCE-B) to the retarder-based Polycarboxylate ether-A (PCE-A) solution to obtain a retarder-based Polycarboxylate ether (PCE) solution;

c) mixing graphene-nanosheets to the retarder-based Polycarboxylate ether (PCE) solution to obtain graphene-nanosheets based PCE solution; and

d) adding at least one air entrainment agent to the graphene-nanosheets based PCE solution obtained at step c to obtain the graphene-nanosheets based concrete additive, wherein the retarder-based salt solution is obtained by mixing at least one retarder with water, wherein the weight percentage of the retarder is chosen between 3% and 5% of the total amount of water.

2 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the at least one retarder and water are mixed at a speed chosen between 600-800 rpm (rotation per minute) for a time period chosen between 10 minutes and 15 minutes.

3 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the retarder-based salt solution and the PCE-A are mixed at a speed chosen between 1200 rpm and 1500 rpm (rotation per minute) for a time period chosen between 10 minutes and 15 minutes.

4 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the weight percentage of the PCE-A is chosen between 20% and 25% of the retarder-based salt solution.

5 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the Polycarboxylate ether-B (PCE-B) and the retarder-based Polycarboxylate ether-A (PCE-A) are mixed at a speed chosen between 1700 rpm and 2000 rpm (rotation per minute) for a time period chosen between 10 minutes and 15 minutes.

6 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the amount of the PCE-B ranges between 30% and 40% of the total amount of the retarder-based Polycarboxylate ether-A (PCE-A) solution.

7 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the weight percentage of the graphene-nanosheets is chosen between 0.5% and 5% of the retarder-based PCE solution.

8 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the graphene-nanosheets and the retarder-based PCE solution are mixed in a shear mixer at a speed chosen between 2500 rpm and 3000 rpm (rotation per minute) for a time period chosen between 30 minutes and 45 minutes.

9 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the air entrainment agent is added to the graphene-nanosheets based PCE solution after 45 minutes of the mixing of the graphene-nanosheets to the PCE solution.

10 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the weight percentage of the air entrainment agent is chosen between 0.5% and 1% of the graphene-nanosheets based PCE solution.

11 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the air entrainment agent and the graphene-nanosheets based PCE solution are mixed at a speed chosen between 2000 rpm and 2300 rpm (rotation per minute) for a time period chosen between 5 minutes and 10 minutes.

12 . The method for preparing the graphene-nanosheets based concrete additive according to claim 1 , wherein the surface area of the graphene-nanosheets is between 320 m 2 /g and 550 m 2 /g.

13 . An additive for concrete comprising:

Polycarboxylate ether-A (PCE-A), Polycarboxylate ether-B (PCE-B), graphene-nanosheets, and at least one retarder, wherein:

at least one retarder is mixed with water to obtain a retarder-based salt solution, wherein the weight percentage of the retarder is chosen between 3% and 5% of total amount of water;

the Polycarboxylate ether-A (PCE-A) is mixed with the retarder-based salt solution to obtain a retarder-based Polycarboxylate ether-A (PCE-A) solution;

the Polycarboxylate ether-B (PCE-B) is added with the retarder-based Polycarboxylate ether-A (PCE-A) solution to obtain a retarder-based Polycarboxylate ether (PCE) solution; and

the graphene-nanosheets are mixed with the retarder-based Polycarboxylate ether (PCE) solution to obtain graphene-nanosheets based PCE solution.

14 . The additive for concrete according to claim 13 , wherein the weight percentage of the PCE-A is chosen between 20% and 25% of the retarder-based salt solution.

15 . The additive for concrete according to claim 13 , wherein the weight percentage of the PCE-B ranges between 30% and 40% of the total amount of the retarder-based Polycarboxylate ether-A solution.

16 . The additive for concrete according to claim 13 , wherein the weight percentage of the graphene-nanosheets is chosen between 0.5% and 5% of the retarder-based Polycarboxylate ether (PCE) solution.

17 . The additive for concrete according to claim 13 , wherein the additive comprises at least one air entrainment agent, wherein the weight percentage of the air entrainment agent is chosen between 0.5% and 1% of the graphene-nanosheets based PCE solution.