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Additives of graphene nanomaterials for the improvement of cementitious compositions, cementitious composition, a process for preparing a reinforced concrete, a reinforced concrete and its use

A technology of cement composition and nanomaterials, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve problems such as hindering uniform distribution

Active Publication Date: 2021-08-17
格拉芬那诺有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sobolkina et al. [Cement and Concrete Composites,34(2012) 1104-1113] reported that CNTs tend to agglomerate when dispersed in a cement matrix, which hinders their uniform distribution in the matrix
[0012] In addition, non-uniformly distributed CNTs cannot form a network in the matrix to support load transfer or mitigate crack development.

Method used

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  • Additives of graphene nanomaterials for the improvement of cementitious compositions, cementitious composition, a process for preparing a reinforced concrete, a reinforced concrete and its use
  • Additives of graphene nanomaterials for the improvement of cementitious compositions, cementitious composition, a process for preparing a reinforced concrete, a reinforced concrete and its use
  • Additives of graphene nanomaterials for the improvement of cementitious compositions, cementitious composition, a process for preparing a reinforced concrete, a reinforced concrete and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Embodiment 1: Additive 1

[0109] The first solution was prepared by dispersing 0.5 g graphene oxide (GO) in 1 kg polycarboxylate and ether based superplasticizer (SP). The resulting dispersion was sonicated for 2 hours in a resonance cycle at 30% amplitude.

[0110] By adding 0.5g graphene nanofibers with low specific surface area (specific surface area ≈ 115m 2 / g, length is 20 to 2000nm, diameter is 5 to 160nm, GNF LS) and 1.5g length is 20μm to 200μm graphene nanofiber (30 to 100m 2 / g, diameter is 2 to 200nm, GNFLL) and 0.025g dispersant (D) (Alcosperse 747) are all dispersed in 1.5kg superplasticizer (polycarboxylate and ether-based superplasticizer) to prepare the second solution . The resulting dispersion was sonicated at 30% amplitude for 2 hours.

[0111] The first solution and the second solution were mixed and the resulting solution was placed in an ultrasonic bath for 24 hours to form Additive 1.

[0112] The weight ratio of the additive components in ...

Embodiment 2

[0125] Embodiment 2: Additive 2

[0126] Additive 2 was prepared following the same procedure as Additive 1, but with high specific surface area graphene nanofibers (specific surface area ≈ 400m 2 / g, with a length of 20 to 2000 nm and a diameter of 5 to 160 nm, GNF HS) instead of graphene nanofibers with low specific surface area (GNFLS).

[0127] The weight ratio of the additive components in the cement is as follows:

[0128] GNF HS: 0.0002% by weight of cement

[0129] GNF LL: 0.0006% by weight of cement

[0130] GO: 0.0002% by weight of cement

[0131] Dispersant (D): Alcosperse 747: account for 1% by weight of the total amount of graphene nanofiber GNF+GO

[0132] Superplasticizer (SP): 1% by weight of cement dispersed between the two solutions that make up the additive

[0133] A concrete sample (1m 3 ). Additive 1 (2.5kg) was mixed with 250kg of cement, 167.5L of water, 880kg of gravel and 1104kg of sand as follows:

[0134] Mix 80% of the water in the mixture ...

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Abstract

An additive of graphene nanomaterials for the improvement of cementitious compositions, a cementitious composition, a process for preparing a concrete a concrete and use of the concrete. The additive includes a mixture of graphene nanofibers, graphene oxide (GO), a dispersing agent (D) and a superplasticizer (SP), comprising at least two graphene nanofibers, selected among graphene nanofibers of high specific surface area (GNF-HS), graphene nanofibers of low specific surface area (GNF-LS) or graphene nanofibers of long length (GNF-LL), wherein the graphene nanofibers have an average diameter comprised between 2 nm and 200 nm, and wherein said additive of graphene nanomaterials by having different proportions of the at least two graphene nanofibers is fine-tuned for different cementitious compositions of particular properties.

Description

technical field [0001] The present invention relates to additives based on graphene nanomaterials for improving cement compositions, preferably concrete compositions, and cement compositions incorporating said additives. [0002] The term "cement" (which is the basis of the cement compositions used herein) is well known in the art and refers to a fine, soft, dry, powdery binder substance which, when mixed with water, can Solidifies to a hard solid substance. Cement is a substance used in construction that sets, hardens and adheres to other materials, binding them together. Cement is commonly used to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or cement mixed with sand and gravel to produce concrete. Cement used in construction is usually inorganic, usually lime or calcium silicate based. As used herein, the term "cement" is understood to include any cement having underwater hardening properties, such as Portland ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B40/00C04B14/38C04B111/28C04B111/34
CPCC04B28/02C04B40/0039C04B2111/0075C04B2111/26C04B2111/28C04B2111/34C04B14/386Y02W30/91C04B14/024C04B14/06C04B20/0008C04B20/0052C04B20/006C04B24/2641C04B2103/32C04B24/2647C04B20/008C04B14/38C04B40/00B82Y40/00B82Y30/00C04B14/026
Inventor 胡安·安赫尔·鲁伊斯·莫亚阿马亚·罗梅罗·伊斯基耶多玛丽亚·德尔·普拉多·拉文·洛佩斯
Owner 格拉芬那诺有限公司