# US 12,215,056 B2 · 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 > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,056 B2 - Document ID: US12215056B2 - Status: Granted - Kind: B2 - Application number: 17/285,931 - Filed: 2019-10-16 - Published: 2021-11-11 - Granted: 2025-02-04 - Earliest claimed: 2018-10-16 - Assignees: Graphenano S.L.; Juan Angel Ruiz Moya - Applicants: Graphenano S.L.; Juan Angel Ruiz Moya - Inventors: Juan Angel Ruiz Moya; Amaya Romero Izquierdo; Maria del Prado Lavin Lopez - Web page: https://patentgrep.com/patent/US12215056B2 ## CPC - C04B 14/026: {of particular shape, e.g. nanotubes} - C04B 14/386: {Carbon (carbon nanotubes C04B14/026)} - C04B 28/02: containing hydraulic cements other than calcium sulfates - C04B 40/0039: {Premixtures of ingredients} - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - B82Y 40/00: Manufacture or treatment of nanostructures - C04B 2111/0075: {for road construction} - C04B 2111/26: Corrosion of reinforcement resistance - C04B 2111/28: Fire resistance, i.e. materials resistant to accidental fires or high temperatures - C04B 2111/34: Non-shrinking or non-cracking materials - Y02W 30/91: Use of waste materials as fillers for mortars or concrete - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## 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. ## Claims ### Claim 1 A cementitious composition comprising cement and an additive of graphene nanomaterials, the additive including a mixture of graphene nanofibers, graphene oxide (GO), a dispersing agent (D) and a superplasticizer (SP), wherein said mixture comprises at least two different graphene nanofibers, selected among: graphene nanofibers of high specific surface area (GNF-HS), in an amount of between 10% and 75% by weight with respect to the additive, having an area comprised between 260 to 400 m2/g and length of 0.02 to 2 μm; graphene nanofibers of low specific surface area (GNF-LS), having an area comprised between 70 to 249 m2/g and length of 0.02 to 2 μm; or graphene nanofibers of long length (GNF-LL), with a specific surface area comprised between 30 to 100 m2/g and a length of 5 to 200 μm, wherein the superplasticizer (SP) is a polycarboxylate ether-based superplasticizer (PCEs) or a sulfonated superplasticizer, wherein the amount of dispersing agent (D) of the additive is of about 1% on the total weight of the graphene nanofibers and graphene oxide, wherein the graphene nanofibers have an average diameter comprised between 2 nm and 200 nm, and wherein the additive contains a total amount of graphene nanofibers and graphene oxide of between 0.0002% and 0.002% by weight with respect to the weight of the cement in the cementitious composition. ### Claim 2 (depends on 1) The cementitious composition of claim 1, wherein the mixture of graphene nanofibers comprises three graphene nanofibers including the graphene nanofibers of high specific surface area (GNF-HS), the graphene nanofibers of low specific surface area (GNF-LS), and the graphene nanofibers of long length (GNF-LL). ### Claim 3 (depends on 1) The cementitious composition of claim 1, wherein the mixture of graphene nanofibers comprises at least two different graphene nanofibers, selected among: between 10% and 50% by weight of the graphene nanofibers of low specific surface area (GNF-LS), between 10% and 50% by weight of the graphene nanofibers of high specific surface area (GNF-HS), and between 50% and 90% by weight of the graphene nanofibers with a specific surface area (GNF-LL), under the condition that the total sum of the percentage weights of the graphene nanofibers is not greater than 100%. ### Claim 4 (depends on 1) The cementitious composition of claim 1, wherein the graphene oxide is in the form of powder or flakes having an average diameter of between 10 and 1000 μm. ### Claim 5 (depends on 1) The cementitious composition of claim 1, wherein the graphene oxide is in the form of powder or flakes having an average diameter of between 15 and 800 μm. ### Claim 6 (depends on 1) The cementitious composition of claim 1, wherein the superplasticizer is present in an amount of between 1% and 2% by weight with respect to the weight of the cement in the cementitious composition. ### Claim 7 (depends on 1) A process for preparing a reinforced concrete comprising mixing a cementitious composition according to claim 1 with water, sand, and gravel. ### Claim 8 (depends on 1) A reinforced concrete comprising the cementitious composition of claim 1 in combination with water, sand, and gravel.