CN111620664A - Non-cement-based ultrahigh-performance concrete and preparation method thereof - Google Patents

Non-cement-based ultrahigh-performance concrete and preparation method thereof Download PDF

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CN111620664A
CN111620664A CN202010479307.XA CN202010479307A CN111620664A CN 111620664 A CN111620664 A CN 111620664A CN 202010479307 A CN202010479307 A CN 202010479307A CN 111620664 A CN111620664 A CN 111620664A
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cement
performance concrete
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吴成清
徐慎春
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Guangzhou University
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Guangzhou University
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    • 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
    • C04B28/24Compositions 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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26Silicates of the alkali metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402Methods
    • 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

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

Abstract

The invention relates to non-cement-based ultrahigh-performance concrete and a preparation method thereof, belonging to the technical field of building materials. The invention provides a non-cement-based ultrahigh-performance concrete which comprises the following raw material components: mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand, coarse sand, sodium silicate solution, sodium hydroxide, a high-efficiency water reducing agent and steel fiber. The raw materials used by the non-cement-based ultrahigh-performance concrete are conventional raw materials and have wide sources; the mineral powder is processed by solid wastes, and is used as a mineral admixture in the non-cement-based ultrahigh-performance concrete, so that the environment is protected; the initial setting time of the non-cement-based ultrahigh-performance concrete mixture can be adjusted according to the modulus of the sodium silicate, so that the initial setting time of the non-cement-based ultrahigh-performance concrete mixture required by different construction requirements can be met; the non-cement-based ultrahigh-performance concrete has high early strength, and the compressive strength of the non-cement-based ultrahigh-performance concrete in 7 days is more than or equal to 120MPa, and the compressive strength of the non-cement-based ultrahigh-performance concrete in 28 days is more than or equal to 160 MPa.

Description

Non-cement-based ultrahigh-performance concrete and preparation method thereof
Technical Field
The invention relates to non-cement-based ultrahigh-performance concrete and a preparation method thereof, belonging to the technical field of building materials.
Background
Concrete materials are widely used building materials in the present day, and have been used for over 100 years. Compared with other building materials, the concrete has the advantages of wide production raw materials, low cost, simple and convenient production process, high compressive strength, large elastic modulus, good durability and the like, and is widely applied to the field of civil engineering. However, the common concrete material has disadvantages of poor deformability, high brittleness, high self-weight, low tensile strength, and the like, and thus, the use thereof is hindered to some extent. Therefore, improving the performance of concrete materials is a constant research subject in academia and engineering.
With the rapid development of economy and the continuous promotion of urbanization in China, modern buildings show a development trend towards super high floors and super large spans, and the requirements on the durability and the strength of concrete are higher and higher. In recent years, with the intensive research on concrete by scholars at home and abroad, an ultra-high performance concrete with high compressive strength (more than 100MPa) is applied. The ultra-high performance concrete has excellent performances of ultra-high impermeability, high corrosion resistance, high antiknock, high electromagnetic interference resistance and the like, and can be used for containment vessels of nuclear power plants, nuclear waste storage containers, oil platforms and oil and gas pipelines. Therefore, the ultra-high performance concrete has important strategic significance in special engineering such as national defense, nuclear power, ocean platforms and the like, and is one of the main directions of future development of the concrete.
At present, cement is a part of a formed ultra-high performance concrete cementing material, raw materials for cement production comprise a calcareous raw material, a silica-alumina raw material and an iron correction raw material, natural silica-alumina raw materials comprise loess, clay, shale, mudstone and the like, the preparation of the raw materials can destroy the environment to a certain extent, the cement production needs a calcination process of the materials, the calcination of the materials can generate certain waste gas, waste materials and the like, and the environment is polluted and the health of people is harmed. Therefore, the development of the non-cement-based ultrahigh-performance concrete is necessary, the initial setting time of the ultrahigh-performance concrete is different due to the stirring, transportation, pouring and tamping and building of the ultrahigh-performance concrete, the initial setting time of the ultrahigh-performance concrete is adjusted more reasonably according to the construction requirements, and the development of actual engineering is positively promoted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide green and environment-friendly non-cement-based ultrahigh-performance concrete.
In order to achieve the purpose, the invention adopts the technical scheme that: the non-cement-based ultrahigh-performance concrete comprises the following raw material components: mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand, coarse sand, sodium silicate solution, sodium hydroxide, a high-efficiency water reducing agent and steel fiber.
The raw material components used by the non-cement-based ultrahigh-performance concrete are conventional raw materials and have wide sources.
The mineral powder is prepared by processing solid wastes, and is used as a mineral admixture in the non-cement-based ultrahigh-performance concrete, so that the mineral powder is green and environment-friendly.
As a preferred embodiment of the non-cement-based ultrahigh-performance concrete, each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: 500-1500 parts of mineral powder, 50-200 parts of silica fume, 80-240 parts of fly ash, 60-240 parts of silica micropowder, 500-1200 parts of fine sand, 150-600 parts of medium sand, 100-450 parts of coarse sand, 300-1400 parts of sodium silicate solution, 20-200 parts of sodium hydroxide, 3-15 parts of high-efficiency water reducing agent and 100-400 parts of steel fiber.
As a preferred embodiment of the non-cement-based ultrahigh-performance concrete, the mineral powder is S95 grade, and the density is 2.8-2.9 g/cm3
As a preferable embodiment of the non-cement-based ultrahigh-performance concrete, the silica fume contains silica, the weight percentage of the silica fume in the silica fume is not less than 95%, and the average particle size of the silica fume is 0.1 μm.
As a preferred embodiment of the non-cement-based ultrahigh-performance concrete, the fly ash is grade I or grade II ash.
In a preferred embodiment of the non-cement-based ultrahigh-performance concrete of the present invention, the silica powder contains 85% by weight of silica in the silica powder, and the silica powder has a particle size of 0.1 to 0.3 μm.
As a preferable embodiment of the non-cement-based ultrahigh-performance concrete, the fineness of the fine sand is 70-110 meshes, the fineness of the medium sand is 40-70 meshes, and the fineness of the coarse sand is 20-40 meshes.
As a preferred embodiment of the non-cement based ultra-high performance concrete according to the present invention, the sodium silicate solution has a solid content of 30.4% sodium silicate.
In a preferred embodiment of the non-cement-based ultrahigh-performance concrete of the invention, the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate of the polycarboxylic acid high-efficiency water reducing agent is not less than 35%.
As a preferred embodiment of the non-cement-based ultrahigh-performance concrete, the length of the steel fiber is 6-15 mm, the diameter of the steel fiber is 0.12mm, and the volume percentage of the steel fiber in each cubic meter of the non-cement-based ultrahigh-performance concrete is 2%.
As a preferable embodiment of the non-cement-based ultrahigh-performance concrete, the 7-day compressive strength of the non-cement-based ultrahigh-performance concrete is not less than 120MPa, and the 28-day compressive strength of the non-cement-based ultrahigh-performance concrete is not less than 160 MPa.
The invention also aims to provide a preparation method of the non-cement-based ultrahigh-performance concrete, which comprises the following steps:
(1) mixing mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand and coarse sand in proportion to form a component A; mixing a sodium silicate solution, sodium hydroxide and a high-efficiency water reducing agent according to a proportion to form a component B;
(2) placing the component A in the step (1) in a stirrer, stirring and mixing for 3-5 minutes, then adding the component B in the step (1) into the stirrer, stirring and mixing for 1-2 minutes, uniformly adding steel fibers when the mixture becomes slurry, continuing stirring, and stopping stirring after the mixture is uniformly mixed to obtain a non-cement-based concrete mixture;
(3) and (3) loading the non-cement-based concrete mixture obtained in the step (2) into a test mould, vibrating for 2min to obtain a test piece of the non-cement-based ultrahigh-performance concrete, placing the test piece at room temperature for 24h, then removing the mould, and then placing the test piece under standard atmospheric pressure for curing to obtain the non-cement-based ultrahigh-performance concrete.
In a preferred embodiment of the preparation method of the present invention, in the step (2), the initial setting time of the non-cement-based concrete mixture is 10 to 1440 min.
In a preferred embodiment of the preparation method of the present invention, the initial setting time of the non-cement-based concrete mixture using 1-mold sodium silicate solution is 10-26 min, the initial setting time of the non-cement-based concrete mixture using 2-mold sodium silicate solution is 40-68 min, and the modulus n in sodium silicate is: n ═ SiO2/Na2O (molar ratio).
Compared with the prior art, the invention has the beneficial effects that: the raw materials used by the non-cement-based ultrahigh-performance concrete are conventional raw materials and have wide sources; the mineral powder is processed by solid wastes, and is used as a mineral admixture in the non-cement-based ultrahigh-performance concrete, so that the environment is protected; the initial setting time of the non-cement-based ultrahigh-performance concrete mixture can be adjusted according to the modulus of the sodium silicate, so that the initial setting time of the non-cement-based ultrahigh-performance concrete mixture required by different construction requirements can be met; the non-cement-based ultrahigh-performance concrete has high early strength, and the compressive strength of the non-cement-based ultrahigh-performance concrete in 7 days is more than or equal to 120MPa, and the compressive strength of the non-cement-based ultrahigh-performance concrete in 28 days is more than or equal to 160 MPa.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The embodiment of the invention relates to non-cement-based ultrahigh-performance concrete, wherein each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: mineral powder (S95 grade, density 2.8 g/cm)3)1000 parts, 100 parts of silica fume (containing 95 percent of silica and having the particle size of 0.1 mu m), 160 parts of fly ash (I-grade ash), 122 parts of silica micropowder (containing 85 percent of silica and having the particle size of 0.3 mu m), 480 parts of fine sand (90 meshes), 266 parts of medium sand (50 meshes), 192 parts of coarse sand (30 meshes), 552 parts of sodium silicate solution (with the solid content of 30.4 percent), 74.28 parts of sodium hydroxide, 9.6 parts of polycarboxylic acid high-efficiency water reducing agent (with the water reducing rate of 36 percent) and 156 parts of steel fiber (with the volume rate of 2 percent and the length of 13 mm).
The preparation method of the non-cement-based ultrahigh-performance concrete comprises the following steps:
(1) mixing mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand and coarse sand in proportion to form a component A; mixing sodium silicate, sodium hydroxide and a high-efficiency water reducing agent according to a proportion to form a component B;
(2) placing the component A in the step (1) in a stirrer, stirring and mixing for 3 minutes, then adding the component B in the step (1) in the stirrer, stirring and mixing for 1 minute, uniformly adding steel fibers when the mixture becomes slurry, continuing stirring, and stopping stirring after the mixture is uniformly mixed to obtain a non-cement-based concrete mixture; the initial setting time of the non-cement-based concrete mixture is 19 min;
(3) and (3) loading the non-cement-based concrete mixture obtained in the step (2) into a test mould, vibrating for 2min to obtain a test piece of the non-cement-based ultrahigh-performance concrete, placing the test piece at room temperature for 24h, then removing the mould, and then placing the test piece under standard atmospheric pressure for curing to obtain the non-cement-based ultrahigh-performance concrete.
Example 2
The embodiment of the invention relates to non-cement-based ultrahigh-performance concrete, wherein each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: mineral powder (S95 grade, density 2.9 g/cm)3)500 parts, 50 parts of silica fume (containing 96% of silica dioxide and having a particle size of 0.1 mu m), 80 parts of fly ash (II-grade ash), 60 parts of silica micropowder (containing 85% of silica dioxide and having a particle size of 0.2 mu m), 500 parts of fine sand (70 meshes), 150 parts of medium sand (40 meshes), 100 parts of coarse sand (20 meshes), 300 parts of sodium silicate solution (with a solid content of 30.4%), 20 parts of sodium hydroxide, 3 parts of polycarboxylic acid high-efficiency water reducing agent (with a water reducing rate of 35%) and 100 parts of steel fibers (with a volume rate of 2% and a length of 6 mm).
The preparation method of the non-cement-based ultrahigh-performance concrete comprises the following steps:
(1) mixing mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand and coarse sand in proportion to form a component A; mixing a sodium silicate solution, sodium hydroxide and a high-efficiency water reducing agent according to a proportion to form a component B;
(2) placing the component A in the step (1) in a stirrer, stirring and mixing for 5 minutes, then adding the component B in the step (1) in the stirrer, stirring and mixing for 2 minutes, uniformly adding steel fibers when the mixture becomes slurry, continuing stirring, and stopping stirring after the mixture is uniformly mixed to obtain a non-cement-based concrete mixture; the initial setting time range of the non-cement-based concrete mixture is 10 min;
(3) and (3) loading the non-cement-based concrete mixture obtained in the step (2) into a test mould, vibrating for 2min to obtain a test piece of the non-cement-based ultrahigh-performance concrete, placing the test piece at room temperature for 24h, then removing the mould, and then placing the test piece under standard atmospheric pressure for curing to obtain the non-cement-based ultrahigh-performance concrete.
Example 3
The embodiment of the invention relates to non-cement-based ultrahigh-performance concrete, wherein each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: mineral powder (S95 grade, density 2.9 g/cm)3)1500 parts, 200 parts of silica fume (containing 97% of silica and having a particle size of 0.1 mu m), 240 parts of fly ash (II-grade ash), 240 parts of silica micropowder (containing 85% of silica and having a particle size of 0.1 mu m), 1200 parts of fine sand (110 meshes), 600 parts of medium sand (70 meshes), 450 parts of coarse sand (40 meshes), 1400 parts of sodium silicate solution (with a solid content of 30.4%), 200 parts of sodium hydroxide, 15 parts of polycarboxylic acid high-efficiency water reducing agent (with a water reducing rate of 37%) and 400 parts of steel fibers (with a volume rate of 2% and a length of 15 mm).
The preparation method of the non-cement-based ultrahigh-performance concrete comprises the following steps:
(1) mixing mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand and coarse sand in proportion to form a component A; mixing a sodium silicate solution, sodium hydroxide and a high-efficiency water reducing agent according to a proportion to form a component B;
(2) placing the component A in the step (1) in a stirrer, stirring and mixing for 4 minutes, then adding the component B in the step (1) in the stirrer, stirring and mixing for 1 minute, uniformly adding steel fibers when the mixture becomes slurry, continuing stirring, and stopping stirring after the mixture is uniformly mixed to obtain a non-cement-based concrete mixture; the initial setting time range of the non-cement-based concrete mixture is 1440 min;
(3) and (3) loading the non-cement-based concrete mixture obtained in the step (2) into a test mould, vibrating for 2min to obtain a test piece of the non-cement-based ultrahigh-performance concrete, placing the test piece at room temperature for 24h, then removing the mould, and then placing the test piece under standard atmospheric pressure for curing to obtain the non-cement-based ultrahigh-performance concrete.
Experimental example 1
The non-cement based ultra-high performance concrete test block prepared in example 1 was subjected to a compression strength test at room temperature using a universal material testing machine according to the specification of the standard of ordinary concrete mechanical property test method (GB/T50081-2002), and the test results are shown in tables 1 and 2.
TABLE 1 cubic compressive strength of non-cement based ultra-high performance concrete for 7 days
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 135.40 120.92 127.12 132.04 132.28 125.00 127.60 120.48
TABLE 2 cubic compressive strength of non-cement based ultra-high performance concrete for 28 days
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 170.51 160.12 162.35 168.15 165.57 162.93 164.31 160.73
As can be seen from the results in tables 1 and 2, the non-cement-based ultrahigh-performance concrete of the present invention has high early strength, and the 7-day compressive strength thereof is not less than 120MPa, and the 28-day compressive strength thereof is not less than 160 MPa.
Experimental example 2
The experimental example is the non-cement-based ultrahigh-performance concrete of example 1, and each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: 1000 parts of mineral powder, 100 parts of silica fume, 160 parts of fly ash, 122 parts of silica micropowder, 480 parts of fine sand, 266 parts of medium sand, 292 parts of coarse sand, 552 parts of sodium silicate solution, 74.28 parts of sodium hydroxide, 9.6 parts of high-efficiency water reducing agent and 156 parts of steel fiber. Wherein sodium silicate (N)a2SiO3) The solution changes are as follows:
TABLE 3 initial setting time of sodium silicate solutions at different moduli
Modulus of elasticity Concentration of Sodium silicate solution Initial setting time (min)
1.2 30.4% 552 parts 19
1.5 34.8% 552 parts 26
TABLE 4 cubic compressive strength of 7 days for non-cement based ultra high performance concrete of 1.5 model sodium silicate solution
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 146.08 133.64 137.24 137.35 130.12 129.87 143.54 144.10
From table 3, it can be seen that the initial setting time of the non-cement-based concrete mixture of the present invention using 1.2-mold sodium silicate solution is 19min, the initial setting time of the non-cement-based concrete mixture using 1.5-mold sodium silicate solution is 26min, and the modulus n in sodium silicate is: n ═ SiO2/Na2O (molar ratio); the data in Table 4 show that the cubic compressive strengths of the non-cement based ultra-high performance concrete of 1.5 model sodium silicate solution are all more than or equal to 120MPa in 7 days.
Experimental example 3
The experimental example is the non-cement-based ultrahigh-performance concrete of example 1, and each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: 1000 parts of mineral powder, 100 parts of silica fume, 160 parts of fly ash, 122 parts of silica micropowder, 480 parts of fine sand, 266 parts of medium sand, 292 parts of coarse sand, 552 parts of sodium silicate solution, 74.28 parts of sodium hydroxide, 9.6 parts of high-efficiency water reducing agent and 156 parts of steel fiber. Wherein the diameter of the steel fibers varies as follows:
TABLE 5 cubic compressive strength of 7 days for non-cement based ultra high performance concrete with 2% by volume of steel fibers having a length of 13mm
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 136.40 120.92 127.12 132.04 132.28 125.00 127.60 120.48
TABLE 6 cubic compressive strength of 7 days for non-cement based ultra high performance concrete with 1% by volume of mixed steel fibers of 15mm and 6mm length
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 121.44 111.44 116.8 119.24 115.52 108.84 113.48 128.76
TABLE 7 cubic compressive strength of non-cement based ultra high performance concrete with 2% by volume of steel fibers having a length of 15mm for 7 days
Test piece number A01 A02 A03 A04 A05 A06 A07 A08
fc/MPa 139.8 137.44 131.68 148.08 134.24 132.12 126.44 128.76
As is clear from the results in tables 5 and 7, the compressive strength of the non-cement-based ultrahigh-performance concrete having a volume fraction of 2% steel fibers with a length of 13mm and a volume fraction of 2% steel fibers with a length of 15mm was not less than 120MPa for 7 days, while the compressive strength of the non-cement-based ultrahigh-performance concrete having a volume fraction of 1% steel fibers with a length of 15mm and 6mm was not completely not more than 120MPa for 7 days.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The non-cement-based ultrahigh-performance concrete is characterized by comprising the following raw material components: mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand, coarse sand, sodium silicate solution, sodium hydroxide, a high-efficiency water reducing agent and steel fiber.
2. The non-cement-based ultrahigh-performance concrete according to claim 1, wherein each cubic meter of the non-cement-based ultrahigh-performance concrete comprises the following raw material components in parts by weight: 500-1500 parts of mineral powder, 50-200 parts of silica fume, 80-240 parts of fly ash, 60-240 parts of silica micropowder, 500-1200 parts of fine sand, 150-600 parts of medium sand, 100-450 parts of coarse sand, 300-1400 parts of sodium silicate solution, 20-200 parts of sodium hydroxide, 3-15 parts of high-efficiency water reducing agent and 100-400 parts of steel fiber.
3. The non-cement-based ultrahigh-performance concrete as claimed in claim 2, wherein the mineral powder is S95 grade and has a density of 2.8-2.9 g/cm3(ii) a The silica fume contains silica, the weight percentage of the silica in the silica fume is more than or equal to 95%, and the average grain size of the silica fume is 0.1 mu m.
4. The non-cement based ultra-high performance concrete according to claim 2, wherein the fly ash is grade i or grade ii ash; the silicon micro powder contains 85% of silicon dioxide by weight, and the particle size of the silicon micro powder is 0.1-0.3 mu m.
5. The non-cement-based ultrahigh-performance concrete according to claim 2, wherein the fineness of the fine sand is 70 to 110 mesh, the fineness of the medium sand is 40 to 70 mesh, and the fineness of the coarse sand is 20 to 40 mesh.
6. The non-cement based ultra high performance concrete of claim 2, wherein the sodium silicate solution has a sodium silicate solids content of 30.4%; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate of the polycarboxylic acid high-efficiency water reducing agent is more than or equal to 35 percent; the length of the steel fiber is 6-15 mm, the diameter of the steel fiber is 0.12mm, and the volume percentage of the steel fiber in each cubic meter of the non-cement-based ultrahigh-performance concrete is 2%.
7. The non-cement-based ultrahigh-performance concrete according to any one of claims 1 to 6, wherein the 7-day compressive strength of the non-cement-based ultrahigh-performance concrete is not less than 120MPa, and the 28-day compressive strength of the non-cement-based ultrahigh-performance concrete is not less than 160 MPa.
8. The method for preparing the non-cement-based ultrahigh-performance concrete according to any one of claims 1 to 7, comprising the steps of:
(1) mixing mineral powder, silica fume, fly ash, silica micropowder, fine sand, medium sand and coarse sand in proportion to form a component A; mixing a sodium silicate solution, sodium hydroxide and a high-efficiency water reducing agent according to a proportion to form a component B;
(2) placing the component A in the step (1) in a stirrer, stirring and mixing for 3-5 minutes, then adding the component B in the step (1) into the stirrer, stirring and mixing for 1-2 minutes, uniformly adding steel fibers when the mixture becomes slurry, continuing stirring, and stopping stirring after the mixture is uniformly mixed to obtain a non-cement-based concrete mixture;
(3) and (3) loading the non-cement-based concrete mixture obtained in the step (2) into a test mould, vibrating for 2min to obtain a test piece of the non-cement-based ultrahigh-performance concrete, placing the test piece at room temperature for 24h, then removing the mould, and then placing the test piece under standard atmospheric pressure for curing to obtain the non-cement-based ultrahigh-performance concrete.
9. The method of claim 8, wherein in step (2), the initial setting time of the non-cement based ultra-high performance concrete mixture is in the range of 10 to 1440 min.
10. The method of claim 9, wherein the initial setting time of the non-cement based ultra-high performance concrete mixture is 10 to 26 minutes using a 1-mode sodium silicate solution and 40 to 68 minutes using a 2-mode sodium silicate solution.
CN202010479307.XA 2020-05-29 2020-05-29 Non-cement-based ultrahigh-performance concrete and preparation method thereof Pending CN111620664A (en)

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CN113773028A (en) * 2021-08-17 2021-12-10 湖南大学 Geopolymer concrete and preparation method thereof
CN116283088A (en) * 2023-03-01 2023-06-23 青岛理工大学 High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof

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CN103370287A (en) * 2010-12-17 2013-10-23 天主教美利坚大学 Geopolymer composite for ultra high performance concrete
US20170334779A1 (en) * 2016-05-20 2017-11-23 The Catholic University Of America Pumpable geopolymer composition for well sealing applications
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CN116283088A (en) * 2023-03-01 2023-06-23 青岛理工大学 High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof

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