CN112551974A - Seawater coral sand ultra-high performance concrete and preparation method thereof - Google Patents
Seawater coral sand ultra-high performance concrete and preparation method thereof Download PDFInfo
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- CN112551974A CN112551974A CN202011435429.5A CN202011435429A CN112551974A CN 112551974 A CN112551974 A CN 112551974A CN 202011435429 A CN202011435429 A CN 202011435429A CN 112551974 A CN112551974 A CN 112551974A
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- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 58
- 241000243321 Cnidaria Species 0.000 title claims abstract description 58
- 239000004576 sand Substances 0.000 title claims abstract description 57
- 239000013535 sea water Substances 0.000 title claims abstract description 38
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000011863 silicon-based powder Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000006004 Quartz sand Substances 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SQMWSBKSHWARHU-SDBHATRESA-N n6-cyclopentyladenosine Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C2=NC=NC(NC3CCCC3)=C2N=C1 SQMWSBKSHWARHU-SDBHATRESA-N 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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
- 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
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use 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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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, shrinkage compensating agents
- C04B22/002—Water
- C04B22/0026—Salt water, e.g. seawater
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses seawater coral sand ultra-high performance concrete, which belongs to the technical field of building materials and comprises the following components in parts by weight: 900-1100 parts of coral sand, 700-900 parts of cement, 100-270 parts of silica fume, 75-120 parts of modified metakaolin, 78-312 parts of steel fiber, 200-300 parts of water, 5-20 parts of water reducing agent and 1-2 parts of defoaming agent. The concrete adopts coral sand to replace quartz sand as aggregate, and can play a role in internal maintenance in the concrete by utilizing the water absorption and water return characteristics of the aggregate, so that the self-shrinkage of the seawater coral sand ultrahigh-performance concrete can be improved, the corrosion of chloride ions in the sea to concrete steel can be prevented by adopting the modified metakaolin, the durability of the concrete is further improved, the common steel fiber is replaced by the stainless steel fiber, the compressive strength and the breaking strength of the concrete are improved, and the water reducing agent and the defoaming agent are adopted, so that the concrete has good workability and compactness. The invention has reasonable and scientific proportioning, and the prepared seawater coral sand ultra-high performance concrete has the characteristics of good workability, high strength, low shrinkage and high durability.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to seawater coral sand ultra-high performance concrete and a preparation method thereof.
Background
The offshore reef island engineering construction requirements are increased due to the ocean economic development and ocean rights and interests maintenance in China, and meanwhile, the offshore reef island building is easy to corrode by the surrounding environment and inconvenient to maintain, so that higher requirements are provided for the mechanical property and the durability of concrete.
The ultra-high performance concrete is a fiber reinforced cement-based composite material with ultra-high mechanical property and ultra-long durability. The mechanical property of the concrete can be developed rapidly, the concrete can maintain the integrity of a concrete system when being used for maintaining and reinforcing a concrete structure, and the cost can be reduced compared with that of an organic polymer; the ultra-high mechanical property makes the composite material suitable for a structure which needs high bearing capacity, the size of a component can be reduced, and the structural span can be increased; the ultra-long durability makes ultra-high performance concrete a possibility to build long-life buildings.
The coral aggregate is a porous structure material, so the cylinder pressure strength is low, the traditional coral concrete has poor workability and low strength, and the requirements of offshore island engineering construction are difficult to meet; the traditional ultrahigh-performance concrete has serious self-shrinkage due to higher consumption of cementing materials, extremely low water-to-cement ratio and elimination of coarse aggregates, and the conventional steel fibers are extremely easy to be corroded by chloride ions and sulfate ions in the sea in a hot and humid environment, so that the traditional ultrahigh-performance concrete has poor durability in the sea environment. The porous structure of the coral sand enables the coral sand to have the characteristics of water absorption and water return, and the coral sand can play a role in internal curing in concrete, so that the self-shrinkage of the concrete is improved; the stainless steel fiber can resist the corrosion of seawater while enhancing and toughening. Therefore, the seawater coral sand ultra-high performance concrete and the preparation method thereof are very significant.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the seawater coral sand ultrahigh-performance concrete and the preparation method thereof, which can effectively solve the problems of poor workability, low strength and the like of the concrete in the prior art for preparing the coral concrete, and the problems of large shrinkage of the ultrahigh-performance concrete, easy corrosion of common steel fibers and complex manufacturing process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides seawater coral sand ultra-high performance concrete which comprises the following components in parts by weight: 900-1100 parts of coral sand, 700-900 parts of cement, 100-270 parts of silica fume, 75-120 parts of modified metakaolin, 78-312 parts of steel fiber, 200-300 parts of water, 5-20 parts of water reducing agent and 1-2 parts of defoaming agent.
Further, the defoaming agent is a silicone defoaming agent.
Further, the modified metakaolin is prepared by the following method:
step (1): adding kaolin and fly ash into 5-10 mol/L sodium hydroxide solution according to the weight ratio of 2-5: 1-2, stirring for 15-30 minutes at room temperature, and drying to obtain a solid;
step (2): and (2) putting the solid obtained in the step (1) into a heating container, heating the solid to 800-900 ℃ from room temperature at the heating rate of 30-45 ℃/min, keeping for 0.5-1 hour, cooling to room temperature, and grinding to obtain the fine powder with the fineness of 700-1000 meshes, so as to obtain the required modified metakaolin.
Further, the seawater coral sand ultra-high performance concrete comprises the following components in parts by weight: 1000 parts of coral sand, 800 parts of cement, 85 parts of modified metakaolin, 150 parts of silica fume, 150 parts of steel fiber, 265 parts of water, 15 parts of water reducing agent and 1 part of defoaming agent.
Further, the cement is ordinary portland cement, preferably ordinary portland cement of strength grade 42.5.
Further, the silica fume is SiO2Mass fraction is more than or equal to 92 percent, and the ratio tableThe area is more than or equal to 15m2And/g, screening silicon powder with the balance less than or equal to 2.0% by 45 mu m.
Further, the coral sand is the middle sand of zone II.
Furthermore, the steel fiber is stainless steel fiber with the length of 10-30 mm and the diameter of 0.1-0.8 mm.
Further, the water is seawater without processing treatment, and the temperature is 5-35 ℃.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 40%.
The preparation method of the seawater coral sand ultra-high performance concrete comprises the following steps:
adding the coral sand and the steel fibers into a stirrer, stirring for 30-60 s, adding the cement, the silica fume, the modified metakaolin, the water reducing agent and the defoaming agent, stirring for 30-60 s, finally adding the water at one time, and stirring for 3-4 min to obtain the seawater coral sand ultrahigh-performance concrete.
The invention has the beneficial effects that:
(1) in the invention, seawater is used for replacing fresh water and coral sand is used for replacing quartz sand in the raw materials. The coral sand is a porous structure material, has high water absorption rate and water absorption and return characteristics, and can play a role in internal maintenance in concrete, thereby improving the self-shrinkage of the seawater coral sand ultra-high performance concrete;
(2) according to the invention, the water reducing agent and the defoaming agent are used in the mixing proportion, so that the concrete has good workability, and the compactness and strength of hardened concrete are improved while harmful bubbles in the concrete are reduced; the stainless steel fiber is adopted to replace the common steel fiber, and the prepared coral sand ultra-high performance concrete has higher compressive strength and rupture strength;
(3) according to the invention, kaolin and fly ash are treated by a sodium hydroxide solution and dried to obtain a solid, and then high-temperature calcination and grinding are carried out to obtain the modified metakaolin, so that the content of silicon-aluminum components is further improved, a small amount of metal ions such as magnesium, sodium, potassium and the like in the fly ash are compounded, the modified metakaolin is adsorbed with chloride ions through the electrostatic interaction among the ions, the physical adsorption capacity and stability of the traditional C-S-H gel to the chloride ions are enhanced, and the corrosion of the chloride ions in the ocean to concrete steel is effectively prevented;
(4) the invention has reasonable and scientific proportioning, calcium hydroxide is generated when the silicate cement is hydrated, the silica fume and the modified metakaolin can be mixed with the calcium hydroxide and water to form a gelling hydration product, so that the porosity of hardened cement slurry is reduced, macropores are thinned, the structure is densified, and the performance is greatly improved; the modified metakaolin replaces part of silica fume, so that the silica fume mixing amount is reduced, the self-shrinkage regulation and control are realized, and the strength of the concrete is improved;
(5) the preparation method of the seawater coral sand ultra-high performance concrete provided by the invention has the advantages that the process is simple, the required raw materials are simple and easy to obtain, seawater is used for replacing fresh water in the raw materials, coral sand is used for replacing quartz sand, local materials are used, and the development and utilization of ocean resources and the construction of islands and reefs in open sea are facilitated.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be purely exemplary of the invention and are not intended to be limiting.
Example 1
The embodiment 1 provides an ultra-high performance concrete of seawater coral sand, which comprises the following components in parts by weight: 1000 parts of sand in the coral in the area II, 800 parts of cement, 85 parts of modified metakaolin, 150 parts of silica fume, 200 parts of steel fiber, 265 parts of seawater, 20 parts of water reducing agent and 1 part of defoaming agent.
The modified metakaolin is prepared by the following method:
step (1): adding kaolin and fly ash into 8mol/L sodium hydroxide solution according to the weight ratio of 4:1, stirring for 30 minutes at room temperature, and drying to obtain a solid;
step (2): and (2) putting the solid obtained in the step (1) into a muffle furnace, heating the temperature from room temperature to 850 ℃, keeping the temperature for 0.5 hour at the heating rate of 40 ℃/min, then cooling to room temperature, and grinding the solid to fine powder with the fineness of 700-1000 meshes to obtain the required modified metakaolin.
The silica fume is SiO2Mass fraction is more than or equal to 92 percent, and specific surface area is more than or equal to 15m2Perg, 45 μm screeningThe balance is less than or equal to 2.0 percent.
The cement is ordinary portland cement with the strength grade of 42.5.
The steel fibers are stainless steel fibers with a length of 13mm and a diameter of 0.2 mm.
The preparation method of the seawater coral sand ultra-high performance concrete provided in the embodiment 1 comprises the following steps:
adding coral sand and steel fibers into a stirrer, stirring for 30s, adding cement, silica fume, modified metakaolin, a water reducing agent and a defoaming agent, stirring for 30s, finally adding water at one time, and stirring for 3min to obtain the seawater coral sand ultrahigh-performance concrete.
Example 2
The embodiment 2 provides an extra-high performance concrete of seawater coral sand and a preparation method thereof, and the difference from the embodiment 1 is only that: the seawater coral sand ultrahigh-performance concrete comprises the following components in parts by weight: 900 parts of coral sand, 900 parts of cement, 100 parts of silica fume, 120 parts of modified metakaolin, 78 parts of steel fiber, 250 parts of water, 10 parts of water reducing agent and 1 part of defoaming agent, wherein the dosage of each component is different, but the parameters such as the used materials are the same.
Example 3
The embodiment 3 provides seawater coral sand ultra-high performance concrete and a preparation method thereof, and the difference from the embodiment 1 is only that: 1100 parts of coral sand, 900 parts of cement, 250 parts of silica fume, 110 parts of modified metakaolin, 156 parts of steel fiber, 250 parts of water, 20 parts of water reducing agent and 1 part of defoaming agent, wherein the consumption of the components is different, but the parameters such as the used materials are the same.
Example 4
The embodiment 4 provides an extra-high performance concrete of seawater coral sand and a preparation method thereof, and the difference from the embodiment 1 is only that: 1000 parts of coral sand, 900 parts of cement, 250 parts of silica fume, 75 parts of modified metakaolin, 117 parts of steel fiber, 270 parts of water, 17 parts of water reducing agent and 1 part of defoaming agent, wherein the consumption of the components is different, but the parameters such as the used materials are the same.
In order to investigate the performance of the seawater coral sand ultrahigh-performance concrete prepared by the method, the expansion degree of the fresh concrete is tested by referring to a test method of an expansion degree test in GB/T50080. After the test is finished, the concrete mixture is filled into test molds with the size of 100mm multiplied by 100mm twice, the filling thickness of each layer is equal, the interval between the layers is 10s, 6 test blocks are respectively formed according to the mixing ratio, after the test pieces are formed, the surfaces of the test pieces are immediately covered by plastic films, after the test pieces are placed in a room with the temperature of 20 +/-5 ℃ for 2d, the test pieces are demoulded, after the demoulded, the test pieces are immediately placed into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of more than or equal to 95 percent for curing until. After curing was completed, the compressive strength of the concrete 28d was tested according to the compressive strength test method in T/CCPA 7-2018. The self-shrinkage of concrete at 3d age was tested according to the non-contact method in GB/T50082. The test results are shown in table 1. It can be seen that the workability of the concrete in the 4 examples is good, the compressive strength is higher than 100MPa, and the shrinkage is small. In conclusion, the seawater coral sand ultrahigh-performance concrete prepared by the method is reasonable and scientific in proportioning, and has the characteristics of good workability, high strength, low shrinkage and high durability.
TABLE 1 ultra-high performance concrete performance index of seawater coral sand
| Numbering | Extension/mm | 28d compressive strength/MPa | 3d self-contraction/. mu.epsilon |
| Example 1 | 550 | 128.5 | 313 |
| Example 2 | 595 | 100.8 | 460 |
| Example 3 | 520 | 120.7 | 427 |
| Example 4 | 575 | 119.5 | 425 |
The foregoing is merely exemplary and illustrative of the present invention and it is within the purview of one skilled in the art to modify or supplement the embodiments described or to substitute similar ones without the exercise of inventive faculty, and still fall within the scope of the claims.
Claims (8)
1. The seawater coral sand ultrahigh-performance concrete is characterized by comprising the following components in parts by weight: 900-1100 parts of coral sand, 700-900 parts of cement, 100-270 parts of silica fume, 75-120 parts of modified metakaolin, 78-312 parts of steel fiber, 200-300 parts of water, 5-20 parts of water reducing agent and 1-2 parts of defoaming agent.
2. The seawater coral sand ultra-high performance concrete as claimed in claim 1, which comprises the following components in parts by weight: 1000 parts of coral sand, 800 parts of cement, 85 parts of modified metakaolin, 150 parts of silica fume, 150 parts of steel fiber, 265 parts of water, 15 parts of water reducing agent and 1 part of defoaming agent.
3. The seawater coral sand ultra-high performance concrete of claim 1 or 2, wherein the modified metakaolin is prepared by the following method:
step (1): adding kaolin and fly ash into 5-10 mol/L sodium hydroxide solution according to the weight ratio of 2-5: 1-2, stirring for 15-30 minutes at room temperature, and drying to obtain a solid;
step (2): and (2) putting the solid obtained in the step (1) into a heating container, heating the solid to 800-900 ℃ from room temperature at the heating rate of 30-45 ℃/min, keeping for 0.5-1 hour, cooling to room temperature, and grinding to obtain fine powder with the fineness of 700-1000 meshes, so as to obtain the modified metakaolin.
4. The seawater coral sand ultra-high performance concrete as claimed in claim 1 or 2, wherein the defoaming agent is an organosilicon defoaming agent.
5. The seawater coral sand ultrahigh-performance concrete as claimed in claim 1 or 2, wherein the cement is ordinary portland cement, the coral sand is medium sand in zone ii, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 40%.
6. The seawater coral sand ultra-high performance concrete as claimed in claim 1 or 2, wherein the silica fume is SiO2Mass fraction is more than or equal to 92 percent, and specific surface area is more than or equal to 15m2And/g, screening silicon powder with the balance less than or equal to 2.0% by 45 mu m.
7. The seawater coral sand ultrahigh-performance concrete as claimed in claim 1 or 2, wherein the steel fibers are stainless steel fibers having a length of 10 to 30mm and a diameter of 0.1 to 0.8 mm.
8. The method for preparing the seawater coral sand ultra-high performance concrete according to any one of claims 1 to 7, comprising the following steps: adding the coral sand and the steel fibers into a stirrer, stirring for 30-60 s, adding the cement, the silica fume, the modified metakaolin, the water reducing agent and the defoaming agent, stirring for 30-60 s, finally adding the water at one time, and stirring for 3-4 min to obtain the seawater coral sand ultrahigh-performance concrete.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113754378A (en) * | 2021-09-17 | 2021-12-07 | 中山市灵湾新材料科技有限公司 | Concrete with high resistance to chloride ion corrosion and preparation method thereof |
| CN113979697A (en) * | 2021-11-30 | 2022-01-28 | 河海大学 | Grouting material for deep-sea concrete defect repair, preparation method thereof and grouting method |
| CN116730689A (en) * | 2023-08-10 | 2023-09-12 | 湘潭大学 | Basalt fiber reinforced coral sand concrete and preparation method thereof |
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| CN105936593A (en) * | 2016-04-28 | 2016-09-14 | 中冶建筑研究总院有限公司 | Seawater coral aggregate concrete |
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| CN116730689A (en) * | 2023-08-10 | 2023-09-12 | 湘潭大学 | Basalt fiber reinforced coral sand concrete and preparation method thereof |
| CN116730689B (en) * | 2023-08-10 | 2023-11-14 | 湘潭大学 | Basalt fiber reinforced coral sand concrete and preparation method thereof |
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