CN111675512A - High-strength green concrete - Google Patents

High-strength green concrete Download PDF

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Publication number
CN111675512A
CN111675512A CN202010586718.9A CN202010586718A CN111675512A CN 111675512 A CN111675512 A CN 111675512A CN 202010586718 A CN202010586718 A CN 202010586718A CN 111675512 A CN111675512 A CN 111675512A
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CN
China
Prior art keywords
parts
admixture
concrete
water
green concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010586718.9A
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Chinese (zh)
Inventor
姚胜甲
韦振兴
韦华升
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanning Jiawang Cement Products Co ltd
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Nanning Jiawang Cement Products Co ltd
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Filing date
Publication date
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Priority to CN202010586718.9A priority Critical patent/CN111675512A/en
Publication of CN111675512A publication Critical patent/CN111675512A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/30Oxides other than silica
    • C04B14/308Iron oxide
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38Fibrous materials; Whiskers
    • C04B14/48Metal
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08Flue dust, i.e. fly ash
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/146Silica fume
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02Treatment
    • C04B20/04Heat treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to a high-strength green concrete which is prepared from the following raw materials in parts by weight: 243 parts of cement, 112 parts of mineral admixture, 163 parts of fine sand, 600 parts of fine sand, 820 parts of water, 100 parts of water and 162 parts of admixture and 8-16 parts of admixture. The invention utilizes the selection of the admixture and the polymerization of the modified silicon powder in a concrete system to reduce the bleeding property and improve the fluidity of the concrete. The concrete of the invention has the characteristics of small fluidity loss, high strength, no delamination, no segregation, no bleeding, good cohesiveness and the like.

Description

High-strength green concrete
Technical Field
The invention relates to the technical field of concrete, in particular to high-strength green concrete.
Background
The concrete is usually prepared by using cement as a gel material, using sand and stone as aggregates, mixing the aggregates with water and an additive according to a certain proportion and mechanically stirring the mixture. The concrete has the advantages of easy molding, low energy consumption, good durability, low price and capability of being combined with steel materials to be made into various bearing mechanisms, is the most widely applied building material in the present generation, and plays an important role in the development of human society.
At present, in order to ensure the strength of a concrete structural member, the glue ratio used in actual engineering basically exceeds 0.27, after the cement using amount is increased, in order to ensure the service performance of a concrete mixture, a coarse aggregate and a fine aggregate need to be added in a concrete system, so as to ensure that the concrete mixture has good flowing property. The use amount of the aggregate in a concrete system is increased, and the problems of laitance, bleeding and the like inevitably occur in the concrete.
After concrete is poured and tamped, in the initial setting process, the concrete slurry system floats on cement slurry and water with better fluidity under the action of gravity extrusion of aggregate, partial water is evaporated outwards and floats to the surface of the concrete slurry to generate bleeding, and a floating slurry layer appears at the same time. In the floating process of the water, a bleeding channel is left in the concrete, and meanwhile, the water floats to the lower part or the side surface of the coarse aggregate, so that internal layering is generated.
When the concrete has serious bleeding, sand lines, sand spots, pitted surfaces and powder are generated on the surface of the concrete, the surface of a concrete structure is shaped and cracked, pores are formed at the bottom or the side surface of stones, bleeding channels are formed, and the mechanical property of the whole concrete structure is influenced.
Disclosure of Invention
The present invention addresses the above-described problems in the background art with respect to deficiencies or inadequacies in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide the high-strength green concrete which is composed of the following raw materials in parts by weight: 243 parts of cement, 112 parts of mineral admixture, 163 parts of fine sand, 600 parts of fine sand, 820 parts of water, 100 parts of water and 162 parts of admixture and 8-16 parts of admixture.
As a further improvement of the invention, the high-strength green concrete is composed of the following raw materials in parts by weight: 187 parts of cement, 135 parts of mineral admixture, 745 parts of fine sand, 146 parts of water and 7 parts of additive.
As a further improvement of the invention, the high-strength green concrete is composed of the following raw materials in parts by weight: 201 portions of cement, 144 portions of mineral admixture, 685 portions of fine sand, 153 portions of water and 11.3 portions of admixture.
As a further improvement of the invention, the mineral admixture consists of 30-45 parts of iron oxide-containing mineral powder, 35-45 parts of I-grade fly ash, 45-68 parts of modified silica fume and 26-44 parts of superfine steel fiber.
As a further improvement of the invention, the modified silica fume is prepared by mixing the silicon spar, the bentonite, the calcium oxide, the graphene clay and the steel slag, then soaking the mixture in hydrochloric acid solution with the concentration of 3.5mol/L for 14h, drying the mixture, then placing the dried mixture into a sealed high-temperature furnace, carrying out heat preservation and sintering at the temperature of 1452 and 1553 ℃ for 4-6h, introducing carbon monoxide gas, stirring the mixture for reaction for 5min, then cooling the mixture to room temperature, crushing and grinding the mixture into powder.
As a further improvement of the invention, the weight parts of the silicon spar, the bentonite, the calcium oxide, the graphene and the steel slag are respectively 35 parts, 32 parts, 12 parts, 14 parts and 6 parts.
As a further improvement of the invention, the additive is a polycarboxylic acid water reducing agent.
The invention has the beneficial effects that:
1. by utilizing the selection of the admixture and the polymerization of the modified silicon powder in a concrete system, the bleeding property is reduced, and the fluidity of the concrete is improved.
2. The concrete of the invention has the characteristics of small fluidity loss, high strength, no delamination, no segregation, no bleeding, good cohesiveness and the like.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
The high-strength green concrete is prepared from the following raw materials in parts by weight: 187 parts of cement, 135 parts of mineral admixture, 745 parts of fine sand, 146 parts of water and 7 parts of additive. The mineral admixture consists of 33 parts of iron oxide-containing mineral powder, 38 parts of I-grade fly ash, 49 parts of modified silica fume and 38 parts of superfine steel fiber.
The modified silica fume is prepared by mixing 35 parts by weight of silicon stone, 32 parts by weight of bentonite, 12 parts by weight of calcium oxide, 14 parts by weight of graphene and 6 parts by weight of steel slag, soaking the mixture in a hydrochloric acid solution with the concentration of 3.5mol/L for 14 hours, drying the mixture, putting the dried mixture into a sealed high-temperature furnace, carrying out heat preservation and sintering at the temperature of 1452 and 1553 ℃ for 4 to 6 hours, introducing carbon monoxide gas, stirring the mixture for reaction for 5 minutes, cooling the mixture to room temperature, crushing and grinding the mixture into powder.
Example 2
The high-strength green concrete is prepared from the following raw materials in parts by weight: 201 portions of cement, 144 portions of mineral admixture, 685 portions of fine sand, 153 portions of water and 11.3 portions of admixture. The mineral admixture consists of 42 parts of iron oxide-containing mineral powder, 42 parts of I-grade fly ash, 63 parts of modified silica fume and 42 parts of superfine steel fiber.
The modified silica fume is prepared by mixing 31 parts by weight of silicon stone, 41 parts by weight of bentonite, 14 parts by weight of calcium oxide, 8 parts by weight of graphene and 10 parts by weight of steel slag, soaking the mixture in 3.5mol/L hydrochloric acid solution for 14 hours, drying the mixture, putting the dried mixture into a sealed high-temperature furnace, carrying out heat preservation and sintering at the temperature of 1510-plus-1525 ℃ for 4-6 hours, introducing carbon monoxide gas, stirring the mixture for reaction for 5 minutes, cooling the mixture to room temperature, crushing and grinding the mixture into powder.
Example 3
The high-strength green concrete is prepared from the following raw materials in parts by weight: 241 parts of cement, 157 parts of mineral admixture, 815 parts of fine sand, 145 parts of water and 12.6 parts of additive.
The mineral admixture consists of 33 parts of iron oxide-containing mineral powder, 38 parts of I-grade fly ash, 49 parts of modified silica fume and 38 parts of superfine steel fiber.
The modified silica fume is prepared by mixing 37 parts by weight of silicon stone, 42 parts by weight of bentonite, 33 parts by weight of calcium oxide, 17 parts by weight of graphene and 9 parts by weight of steel slag, soaking the mixture in a hydrochloric acid solution with the concentration of 3.5mol/L for 14 hours, drying the mixture, putting the dried mixture into a sealed high-temperature furnace, carrying out heat preservation and sintering at the temperature of 1452 and 1553 ℃ for 4 to 6 hours, introducing carbon monoxide gas, stirring the mixture for reaction for 5 minutes, cooling the mixture to room temperature, crushing and grinding the mixture into powder.
Performance test:
preparing two groups of high-strength green concrete by adopting the raw materials of the embodiment 1, the embodiment 2 and the embodiment 3 according to the same method, preparing reference concrete, and testing the slump, the expansion and the apparent density of the recycled coarse aggregate concrete according to the standard of the test method for the performance of common concrete mixtures (GB/T50080); testing the mechanical property of the recycled coarse aggregate concrete according to a method in the standard of ordinary concrete mechanical property test methods (GB/T50081); the properties of the concrete were tested and found to be shown in tables 1-2 below:
TABLE 1 Properties of the concretes TABLE 1
TABLE 2 Properties of the concretes TABLE II
As can be seen from the data in tables 1-2, the concrete prepared by the invention meets the grade C35-C70, and the compression resistance, the chloride ion penetration resistance and the water resistance of the concrete have greater advantages than those of standard concrete, which indicates that the concrete has good performance.
Description of the principle:
mineral powder containing ferric oxide, I-grade fly ash, modified silica fume and fine steel fiber are selected as the admixture, wherein the modified silica fume is formed by soaking silica spar, bentonite, calcium oxide, graphene soil and steel slag in a hydrochloric acid water solution, the calcium oxide reacts in the hydrochloric acid to promote the silica spar, the bentonite, the graphene soil and the steel slag to foam to form a partial flocculating constituent, the flocculating constituent is sintered and modified after being dried and melted at high temperature, carbon dioxide formed by the graphene soil at high temperature and introduced carbon oxide promote the silica spar, the bentonite and the steel slag to form an adhesive polymer, the proportion of micropores of the polymer and the number of functional groups on the surface are increased, the adsorption performance of the polymer is improved, the outer surface of the polymer is round and smooth, and the flow is facilitated. Thus, when it is used to prepare concrete, the functions of adsorbing water, diffusing water layer and forming coagulation structure in cement slurry are strengthened, and the bleeding of mixed material is reduced.
After the silicon spar, the bentonite, the graphene clay and the steel slag are sintered and modified at high temperature, the tensile strength and the toughness of the polymer are increased compared with those of a single material; when the modified silica fume polymer is mixed with other materials to prepare concrete, the prepared concrete is more tightly blended and can be seamlessly fused due to the adsorption and the micropores of the modified silica fume polymer, the modified silica fume polymer is not easy to shrink and crack, and the hydrochloric acid foams the silicon spar, the bentonite, the graphene soil and the steel slag to form partial floccules, so that the expansion effect is good, and the concrete is further prevented from shrinking and cracking.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (7)

1. The high-strength green concrete is characterized by comprising the following raw materials in parts by weight: 243 parts of cement, 112 parts of mineral admixture, 163 parts of fine sand, 600 parts of fine sand, 820 parts of water, 100 parts of water and 162 parts of admixture and 8-16 parts of admixture.
2. The high-strength performance green concrete according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 187 parts of cement, 135 parts of mineral admixture, 745 parts of fine sand, 146 parts of water and 7 parts of additive.
3. The high-strength performance green concrete according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 201 portions of cement, 144 portions of mineral admixture, 685 portions of fine sand, 153 portions of water and 11.3 portions of admixture.
4. A high strength green concrete according to any one of claims 1 to 3, wherein the mineral admixture comprises 30 to 45 parts of iron oxide-containing mineral powder, 35 to 45 parts of class i fly ash, 45 to 68 parts of modified silica fume and 26 to 44 parts of fine steel fibers.
5. The high-strength performance green concrete as claimed in claim 4, wherein the modified silica fume is prepared by mixing silica spar, bentonite, calcium oxide, graphene clay and steel slag, soaking in 3.5mol/L hydrochloric acid solution for 14h, drying, placing in a sealed high-temperature furnace, performing heat preservation and sintering at 1452-1553 ℃ for 4-6h, introducing carbon monoxide gas, stirring for 5min, cooling to room temperature, crushing and grinding into powder.
6. The high-strength green concrete according to claim 5, wherein the weight parts of the silica spar, the bentonite, the calcium oxide, the graphene oxide and the steel slag are 35 parts, 32 parts, 12 parts, 14 parts and 6 parts respectively.
7. The high-strength green concrete according to any one of claims 1 to 3, wherein the admixture is a polycarboxylic acid water reducing agent.
CN202010586718.9A 2020-06-24 2020-06-24 High-strength green concrete Pending CN111675512A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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