Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
  • C04B22/08—Acids or salts thereof
  • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
  • C04B22/08—Acids or salts thereof
  • C04B22/085—Acids or salts thereof containing nitrogen in the anion, e.g. nitrites
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/16—Sulfur-containing compounds
  • C04B24/20—Sulfonated aromatic compounds
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
  • C04B2103/302—Water reducers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the cement may commonly be hydraulic cement, such as Portland cement.
• Portland cement also known as Ordinary Portland Cement or OPC
• OPC Ordinary Portland Cement
• Portland cement is prepared by heating a mixture of raw components (including calcium carbonate, aluminium silicate, silicon dioxide and miscellaneous iron oxides) to a sintering temperature (usually about 1450°C), resulting in the formation of clinker.
• Portland cement clinker is formed by the reaction of calcium oxide with acidic components to give primarily tricalcium silicate, dicalcium silicate, tricalcium aluminate, and a ferrite phase “C4AF” (tetracalcium aluminoferrite).
• This clinker is ground with calcium sulphate (usually in the form of gypsum) in a grinding mill to provide the cement in the form of a fine, homogeneous powder.
• Other additives or cement replacements can be incorporated before or after the milling process. These include fillers and OPC replacements, such as calcium carbonate and other minerals, ground granulated blast furnace slag, natural pozzolans and pulverised fuel ash (PFA).
• the components that form the cement powder (clinker, calcium sulphate, and optional additives such as fillers and cement replacements) may be referred to as the cement composition.
• the strength of concrete is important, because it is used to make articles that need to have this property. For example, roads, pavements, bridges, walls, buildings and foundations are often made from concrete.
• Concrete admixtures are commonly added during mixing of the cement, aggregates and water, to enhance specific properties of the fresh or hardened concrete, e.g. workability, durability, or early and/or final strength.
• Concrete admixtures may include one or more water-reducing agent.
• Water-reducing agents are additives that can reduce the amount of water that needs to be used for mixing, and that can increase the strength of concrete without adversely impacting concrete workability.
• a concrete admixture that includes one or more water-reducing agent may be referenced as a water-reducing concrete admixture.
• the present invention provides, in a second aspect, a water-reducing concrete admixture comprising: a) one or more agent selected from sodium metabisulphite, sodium nitrate, sodium naphthalene, calcium metabisulphite, calcium nitrate, calcium naphthalene and combinations thereof; and b) lignosulfonate material.
• the water-reducing concrete admixture does not comprise formaldehyde.
• sodium naphthalene When sodium naphthalene is present, it is preferably in the form of sodium naphthalene sulfonate.
• the agent is selected from sodium metabisulphite, sodium nitrate and sodium naphthalene.
• a water-reducing concrete admixture comprises (a) one or more lignosulfonate- replacement agent selected from sodium metabisulphite, sodium nitrate, sodium naphthalene, calcium metabisulphite, calcium nitrate, calcium naphthalene and combinations thereof and (b) lignosulfonate material. It may be that the weight ratio of lignosulfonate-replacement agent to lignosulfonate material is from 1 :50 to 50: 1, such as from 1 :40 to 40: 1, preferably from 1 :30 to 30: 1, e.g.
• lignosulfonate-replacement agent as lignosulfonate material, e.g. at least three times as much.
• additives may be present in the water-reducing concrete admixture, e.g. in amounts of 15wt% or less, such as 10wt% or less, e.g. from 0.5 to 10wt% or from 1 to 8wt%.
• additives may be materials known in the art for use in concrete admixtures, e.g. surfactants (air entraining agents and/or defoamers) and/or amines (known for use as strength enhancers and/or set accelerators) and/or defoamers and/or biocides.
• Amines such as triethanolamine and tri-isopropanolamine and diethanol isopropanolamine are, in particular, known for use in concrete and may optionally be present.
• Specific examples of additives that may be present in the present invention include sodium lauryl ether sulphate, triethanolamine and tri-isopropanolamine.
• Triisobutylphosphate and formaldehyde are also examples of other additives that can, in embodiments, be present.
• melamine and/or sulfonated melamine resin salts are included as additives, e.g. in amounts of 15wt% or less, such as 10wt% or less or 5wt% or less, e.g. from 0.5 to 10wt% or from 1 to 8wt%.
• additives e.g. in amounts of 15wt% or less, such as 10wt% or less or 5wt% or less, e.g. from 0.5 to 10wt% or from 1 to 8wt%.
• a water-reducing concrete admixture comprises one or more lignosulfonate-replacement agent selected from sodium metabisulphite, sodium nitrate, sodium naphthalene, calcium metabisulphite, calcium nitrate, calcium naphthalene and combinations thereof and comprises no lignosulfonate material.
• the blend of modified sugars comprises glucose syrup and sodium gluconate in a weight ratio of 0.3: 1 or more, especially 0.5 : 1 or more, preferably 0.6: 1 or more or 0.7: 1 or more. Having at least half as much glucose syrup as sodium gluconate, by weight in the blend may be beneficial. In some embodiments, it may be that the sodium gluconate is replaced, partly or fully, by potassium gluconate.
• the weight ratio of lignosulfonate-replacement agent to the blend of modified sugars is from 1 :50 to 50: 1, such as from 1 :40 to 40: 1, preferably from 1 :30 to 30: 1, e.g. it may be from 1 :25 to 25: 1 or from 1 : 20 to 20: 1 or from 1 : 15 to 15: 1. In one preferred embodiment it may be that the weight ratio of lignosulfonate-replacement agent to the blend of modified sugars is from 1 : 10 to 10: 1, such as from 1 :7 to 7: 1, preferably from 1 :5 to 5: 1 or from 1 :3 to 3: 1.
• the lignosulfonate-replacement agent is not sodium metabisulphite.
• the trial concretes were prepared using a pan type mixer, with 10 dm 3 volume mixes being prepared for testing.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (1)

• 2021
  • 2021-09-07 EP EP21777207.8A patent/EP4392385A1/de active Pending

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