CN113788646A - High-performance alkali-activated slag-based seawater coral aggregate concrete and preparation method thereof - Google Patents
High-performance alkali-activated slag-based seawater coral aggregate concrete and preparation method thereof Download PDFInfo
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- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 108
- 239000003513 alkali Substances 0.000 title claims abstract description 65
- 239000004567 concrete Substances 0.000 title claims abstract description 63
- 239000013535 sea water Substances 0.000 title claims abstract description 56
- 239000002893 slag Substances 0.000 title claims abstract description 43
- 241000243321 Cnidaria Species 0.000 title claims abstract 23
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 34
- 239000004576 sand Substances 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 22
- 239000012190 activator Substances 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 10
- 239000002440 industrial waste Substances 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 9
- 229920002748 Basalt fiber Polymers 0.000 claims description 6
- 238000009736 wetting Methods 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229910020489 SiO3 Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
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- 238000005303 weighing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000005445 natural material Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 5
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- 230000009471 action Effects 0.000 abstract description 2
- 244000132059 Carica parviflora Species 0.000 description 85
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- 238000010276 construction Methods 0.000 description 5
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- 230000000694 effects Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000251511 Holothuroidea Species 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Organic Chemistry (AREA)
- Farming Of Fish And Shellfish (AREA)
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Abstract
The invention provides a high-performance alkali-activated slag-based seawater coral aggregate concrete and a preparation method thereof. The invention can reduce the defects of quick setting time and large shrinkage of the alkali-activated full-slag cementing material by adding a certain proportion of fly ash and silica fume, and can not influence the strength characteristic of concrete. The fiber is added to effectively increase the toughness and the crack resistance of the coral aggregate concrete. Meanwhile, the shrinkage of the alkali-activated slag cementing material can be relieved to a certain extent by the constraint action of the fibers. The concrete is suitable for marine environment, and the purposes of environmental protection, high strength and high durability are achieved.
Description
Technical Field
The invention belongs to the technical field of marine construction engineering materials, and particularly relates to high-performance alkali-activated slag-based seawater coral aggregate concrete and a preparation method thereof.
Background
The coral aggregate concrete is used as a novel engineering material in ocean engineering construction, fully utilizes special ocean resources of sea water, waste coral reefs and other island regions, solves the problem of shortage of traditional engineering materials on island reefs in the open sea, saves engineering cost, reduces project construction period, and is suitable for high-temperature, high-humidity, high-salt and windy ocean environments.
However, coral aggregate concrete suffers from the following drawbacks: 1) the coral aggregate has the characteristics of light weight, multiple pores, low cylinder pressure strength, multiple internal defects, high water absorption and the like, so that the coral aggregate concrete prepared by the conventional method has poor toughness and tensile strength and faces the bottleneck problems of low compressive strength, small elastic modulus, insufficient impermeability and durability and the like. 2) The traditional coral aggregate concrete takes cement as a cementing material, and the cement can cause energy consumption and environmental problems in the production process and is not beneficial to the development of green and low carbon. In the face of increasing ocean engineering infrastructure construction, a coral aggregate concrete with localized novel raw materials, low cost, high environmental protection, high strength and high durability needs to be developed urgently.
Disclosure of Invention
The invention aims to provide high-performance alkali-activated slag-based seawater coral aggregate concrete and a preparation method thereof, wherein the concrete has better working performance under the condition of not reducing the strength by adjusting the reasonable proportion of the raw material components of the cementing material, and the problems of quick setting time and large shrinkage of the traditional alkali-activated full-slag-based cementing material are solved; then, filling and improving a microscopic interface of the slurry and the aggregate by utilizing the compact microstructure characteristic of the alkali-activated cementing material, thereby solving the problems of low strength and poor durability of the traditional coral aggregate concrete; strength and toughness are further enhanced by the addition of fibers. In order to achieve the purpose, the invention adopts the following technical scheme:
a high-performance alkali-activated slag-based seawater coral aggregate concrete is prepared by mixing industrial waste residues, an alkali activator, fibers, coral reef sand, coral reef stone and seawater.
Preferably, the industrial waste residue comprises slag, fly ash and silica fume, and the mixture of the slag, the fly ash and the silica fume is used as a raw material of a cementing material; wherein, the slag accounts for 75 to 80 percent of the total amount of the cementing material; the fly ash accounts for 15-20% of the total amount of the cementing material; the amount of silica fume is 5% of the total amount of the gelled material.
Preferably, the fiber is one or more of polypropylene fiber, carbon fiber and basalt fiber, the diameter is 43-53 mu m, the length is 6-10 mm, and the doping amount accounts for 0.2-0.6% of the industrial waste residue.
Preferably, the coral reef sand is fine sand or medium sand, the particle size of the coral reef is 5-25mm natural original or crushed coral reef, and the volume sand rate of the coral reef is 45-55%.
Preferably, the alkali-activator is composed of Na2SiO3The powder, the flake NaOH and the seawater are prepared, so that the modulus of the alkali activator is 1.2-1.6, and the alkali mixing amount is 4-8%.
Preferably, the seawater can be natural seawater or artificially proportioned seawater, and the total water-to-gel ratio is 0.55-0.65.
A preparation method of high-performance alkali-activated slag-based seawater coral aggregate concrete comprises the following steps:
s1, weighing raw materials of industrial waste residues, fibers, coral reef sand, coral reef stone, seawater and an alkali activator for later use; wherein the alkali activator comprises Na as raw material2SiO3Powder and flake NaOH;
s2, preparing an alkali activator:
mixing Na2SiO3Pouring the powder into a part of seawater, stirring, adding flake NaOH into the mixed solution, and continuously stirring until Na2SiO3Completely dissolving the powder and NaOH, sealing the prepared alkaline hair-growing agent solution and cooling for later use;
s3, pre-wetting coral reef sand and coral reef: placing the coral reef sand and the coral reef in a stirrer, dry-stirring for 1.5-3 min, uniformly mixing the coral reef sand and the coral reef sand, adding the other part of seawater, and stirring to enable the aggregate to realize a pre-wetting condition;
s4, pouring the slag, the fly ash and the silica fume into the mixture in the S3;
s5, pouring fibers into the mixture in the S4 and stirring;
s6, pouring the alkali activator prepared in S2 into the mixture in S5 and stirring to complete the stirring of the concrete.
Compared with the prior art, the invention has the advantages that:
(1) the concrete prepared by the invention effectively utilizes special resources of seawater, waste coral aggregates and the like in the remote island reef area, not only solves the problem of shortage of traditional building materials in the island area, but also avoids adverse effects on project schedule caused by transportation or weather change, and greatly reduces the construction cost and construction period. In addition, the coral aggregates used for preparing the concrete can be obtained from waste coral fragments generated by natural weathering, channel excavation, port dredging and the like, the natural ecological environment of the coral reef cannot be damaged, and the occupation of the waste coral fragments on the scarce island space can be reduced to a certain extent.
(2) The invention adopts the high-strength and high-durability alkali-activated slag cementing material to replace the traditional cement-based material, effectively reduces the energy consumption and the CO2 emission in the cement production process, and realizes the purposes of environmental protection and sustainable development. Meanwhile, the alkali-activated cementing material slurry has a compact structure and the capability of fixing chloride ions, and the characteristic enhances the seawater erosion resistance of the traditional coral aggregate concrete, thereby effectively improving the serviceability and durability of the marine concrete and the structure thereof. In addition, 10-15% of fly ash and 5% of silica fume are added to replace slag powder, so that the defects of quick setting time and large shrinkage of the alkali-activated slag cementing material can be greatly alleviated, and the strength characteristic of the coral aggregate concrete is basically not influenced.
(3) The invention adopts the alkali-activated cementing material with compact slurry to effectively fill the surface pores of the coral aggregates and improve the microstructure of the aggregate-slurry interface. The improved interface microstructure delays the development and propagation of cracks in the loading process, and effectively enhances the compressive strength and the tensile strength of the coral aggregate concrete. At the same time, these enhanced properties can also effectively improve the bonding performance between the tendon and the coral aggregate concrete, as shown in fig. 3.
(4) The invention is doped with the fibers such as polypropylene fiber, carbon fiber, basalt fiber and the like to increase the tensile strength and the breaking strength of the coral aggregate concrete and further improve the toughness and the crack resistance of the coral aggregate concrete. Meanwhile, the shrinkage of the alkali-activated slag cementing material is reduced to a certain extent by the constraint effect of the fibers.
(5) According to the invention, the combination of the coral aggregate and the alkali-activated cementing material is adopted, and the drying shrinkage of the alkali-activated concrete is reduced (as shown in figure 4), which is mainly caused by the self-curing effect of the porous coral aggregate.
Drawings
FIG. 1 is a diagram showing a process of formulating an alkali activator according to an embodiment of the present invention;
FIG. 2 is a flow chart of the preparation of the high-performance alkali-activated slag-based seawater coral aggregate concrete according to one embodiment of the present invention;
FIG. 3 is a graph comparing the binding slip curves of cement-based seawater coral aggregate concrete and alkali-activated slag-based seawater coral aggregate concrete;
FIG. 4 is a graph showing the shrinkage comparison between alkali-activated seawater coral mortar and alkali-activated ordinary mortar.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
The high-performance alkali-activated slag-based seawater coral aggregate concrete is characterized in that the defects of quick setting time and large shrinkage of an alkali-activated full-slag-based cementing material are alleviated by adjusting the proportion of each component of the cementing material, a proportion with good workability and strength is preferably selected on the premise of not weakening the strength, and then fibers are doped for toughening, so that the concrete is finally suitable for a marine environment, and the aims of environmental protection, high strength and high durability are fulfilled. Specifically, the artificial sea cucumber is prepared by mixing industrial waste residues, an alkali activator, fibers, coral reef sand, coral reef stone and seawater.
Specifically, the industrial waste residue comprises slag, fly ash and silica fume, and the mixture of the slag, the fly ash and the silica fume is used as a raw material of a cementing material; wherein, the slag accounts for 75 to 80 percent of the total amount of the cementing material; the fly ash accounts for 15-20% of the total amount of the cementing material; the amount of silica fume is 5% of the total amount of the gelled material.
The fiber is one or more of polypropylene fiber, carbon fiber and basalt fiber, the diameter is 43-53 mu m, the length is 6-10 mm, and the doping amount accounts for 0.2-0.6% of the using amount of the cementing material.
Coral aggregates (a mixture of coral reef sand and coral reef stone) are derived from waste coral aggregates produced by natural weathering, canal excavation and port dredging. The coral reef sand is preferably fine sand or medium sand; the coral reef has a particle size of 5-25mm, and has a volume sand rate of 45-55% in a natural or crushed coral reef.
The alkali activator is composed of instant Na2SiO3Powder (59.6 wt% SiO2And 21.6 wt% Na2O), flake NaOH and seawater, so that the modulus of the alkali activator is 1.2-1.6, and Na2The content of O is 4-8%.
The seawater can be natural seawater or artificial seawater prepared in proportion, the total water-to-gel ratio is 0.55-0.65, and the water-to-gel ratio is the ratio of the amount of seawater to the amount of the cementing material.
Wherein each cubic concrete comprises the following raw materials in parts by mass: 440kg of slag, 60-90kg of fly ash, 20-30kg of silica fume, 850kg of coral reef sand, 700kg of coral reef stone, 1-3kg of fiber and Na2SiO345-90kg of powder, 15-30kg of flake NaOH and 330kg of seawater 220-.
The preparation method of the high-performance alkali-activated slag-based seawater coral aggregate concrete comprises the following steps:
s1, weighing raw materials of industrial waste residues, fibers, coral reef sand, coral reef stone, seawater and an alkali activator for later use; wherein the alkali activator comprises Na as raw material2SiO3Powder and flake NaOH.
S2, preparing an alkali activator:
mixing Na2SiO3Pouring the powder into half seawater, stirring for about 2min, slowly adding flake NaOH into the mixed solution, and continuously stirring for about 3min to Na2SiO3The powder and NaOH were completely dissolved, and the resulting alkaline hair solution was sealed and cooled for use. The slow pouring of flake NaOH with stirring was done to avoid the NaOH precipitating and caking in the vessel.
S3, pre-wetting coral reef sand and coral reef: placing the coral reef sand and the coral reef in a stirrer, dry-stirring for 1.5-3 min, uniformly mixing the coral reef sand and the coral reef, adding the other half of seawater, and stirring for about 3min to realize the pre-wetting condition of the coral aggregate.
S4, pouring the mixture of the slag, the fly ash and the silica fume into the mixture of the S3, and mixing for about 2min to fully disperse the mixture.
S5, the fiber is slowly poured into the mixture in the S4 and stirred, and the fiber is slowly blended with the stirring to ensure that the fiber is uniformly dispersed and is not agglomerated.
S6, pouring the alkali-activator prepared in S2 into the mixture in S5 and stirring for about 3min to complete the stirring of the concrete.
In this example, the concrete was composed of S95 slag powder, class I fly ash, 98 silica fume, coral aggregate, basalt fiber, instant sodium silicate powder (59.6 wt% SiO)2And 21.6 wt% Na2O), flaky anhydrous NaOH and seawater.
Wherein the fineness modulus of the coral reef sand is 2.63; the coral reef is coral rock of 5-25mm continuous gradation; the basalt fiber is chopped fiber with the length of 8-10mm, and the doping amount is 0.4 percent of the using amount of the cementing material; the seawater is prepared according to ASTM D1141-2003 standard; modulus of excitant (SiO) used in concrete2/Na2O) is 1.2, and the alkali content (Na)2The ratio of the mass of O to the amount of the binding material) is 3%, 4% and 6%; a control example 1 was also prepared using PO 42.5 cement. The mass ratio of each raw material in each cubic meter of concrete in the examples is shown in table 1.
TABLE 1 mixing ratio of coral aggregate concrete in each example
After the concrete in the above examples is cured for 3, 7, 28 and 60 days, tests of compression resistance, splitting tensile strength and elastic modulus are carried out according to the test method standard (GB/T50081-2019) of concrete physical mechanical properties. The test results are shown in table 2.
TABLE 2 mechanical Properties of coral skeleton concrete test results
As can be seen from examples 2-4 in Table 2, the compressive strength, the splitting tensile strength and the elastic modulus of the alkali-activated slag-based seawater coral aggregate concrete gradually increase with the increase of the alkali doping amount, which indicates that the concrete can be doped with an appropriate alkali doping amount according to the working requirements.
Compared with the traditional cement-based coral aggregate concrete, the alkali-activated slag-based seawater coral aggregate concrete has the advantages that the 28-day split tensile strength is improved by 5.0 percent and the 28-day elastic modulus is improved by 9.6 percent under the condition that the 28-day compressive strength is consistent compared with the traditional cement-based coral aggregate concrete.
Comparing example 2 with example 5, it can be seen that the 28-day compressive strength of the alkali-activated slag-based seawater coral aggregate concrete doped with the fibers is improved by 3.6%, the 28-day cleavage tensile strength is improved by 15.4%, and the 28-day elastic modulus is improved by 4.4%.
Comparing example 1 with example 5, it can be seen that the 28-day split tensile strength of the alkali-activated slag-based seawater coral aggregate concrete doped with fibers is improved by 20% and the 28-day elastic modulus is improved by 14.4% compared with the conventional cement-based coral aggregate concrete. The main reasons are as follows: the alkali-activated cementing material has a compact slurry structure after being coagulated, and the formation of the compact slurry structure can fill the external pores of the coral aggregate, so that the microstructure of the aggregate-slurry interface is improved, and the development of micro cracks and the invasion of external corrosive ions are delayed. In addition, the improved aggregate-slurry interface is beneficial to the improvement of the bonding performance between the reinforcement and the concrete, and the bonding strength is improved by 26.6 percent, as shown in figure 3 (3 curves in each concrete represent 3 same test pieces). Meanwhile, the cracking and shrinkage of the concrete can be delayed due to the restraint and bridging action of the fibers, so that the strength and ductility of the traditional coral aggregate concrete are effectively improved.
In fig. 4, as can be appreciated by those skilled in the art: the alkali-activated common mortar refers to alkali-activated cementing materials, river water and river sand; as can be seen from fig. 4: the shrinkage of the alkali-activated mortar can be reduced by the coral aggregate, and the mixture ratio is that coral stones are removed on the basis of the table 1, namely the alkali-activated cementing material, seawater and coral sand.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The high-performance alkali-activated slag-based seawater coral aggregate concrete is characterized by being prepared by mixing industrial waste residues, an alkali activator, fibers, coral reef sand, coral reef stone and seawater.
2. The high-performance alkali-activated slag-based seawater coral aggregate concrete according to claim 1, wherein the industrial residue comprises slag, fly ash, silica fume, a mixture thereof as a raw material of a cementitious material; wherein, the slag accounts for 75 to 80 percent of the total amount of the cementing material; the fly ash accounts for 15-20% of the total amount of the cementing material; the amount of silica fume is 5% of the total amount of the gelled material.
3. The high-performance alkali-activated slag-based seawater coral aggregate concrete according to claim 2, wherein the fibers are one or more of polypropylene fibers, carbon fibers and basalt fibers, the diameter is 43-53 μm, the length is 6-10 mm, and the doping amount accounts for 0.2-0.6% of the using amount of the cementing material.
4. The high performance alkali-activated slag-based seawater coral aggregate concrete of claim 1, wherein the coral reef sand is preferably fine sand or medium sand, and the coral reef has a particle size of 5-25mm as a natural material or crushed coral reef with a volume sand ratio of 45-55%.
5. The high-performance alkali-activated slag-based seawater coral aggregate concrete according to claim 1, wherein the alkali-activating agent is composed of Na2SiO3The powder, the flake NaOH and the seawater are prepared, so that the modulus of the alkali activator is 1.2-1.6, and the alkali mixing amount is 4-8%.
6. The high performance alkali-activated slag-based seawater coral aggregate concrete of claim 1, wherein the seawater is natural seawater or artificially proportioned seawater having a total water-to-cement ratio of 0.55 to 0.65.
7. A method for preparing the high-performance alkali-activated slag-based seawater coral aggregate concrete according to any one of claims 3 to 6, comprising the steps of:
s1, weighing raw materials of industrial waste residues, fibers, coral reef sand, coral reef stone, seawater and an alkali activator for later use; wherein the alkali activator comprises Na as raw material2SiO3Powder and flake NaOH;
s2, preparing an alkali activator:
mixing Na2SiO3Pouring the powder into a part of seawater, stirring, adding flake NaOH into the mixed solution, and continuously stirring until Na2SiO3Completely dissolving the powder and NaOH, sealing the prepared alkaline hair-growing agent solution and cooling for later use;
s3, pre-wetting coral reef sand and coral reef: placing the coral reef sand and the coral reef in a stirrer, dry-stirring for 1.5-3 min, uniformly mixing the coral reef sand and the coral reef, adding the other part of seawater, and stirring;
s4, pouring the slag, the fly ash and the silica fume into the mixture in the S3;
s5, pouring fibers into the mixture in the S4 and stirring;
s6, pouring the alkali activator prepared in S2 into the mixture in S5 and stirring to complete the stirring of the concrete.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010414A (en) * | 2022-06-08 | 2022-09-06 | 安徽理工大学 | Alkali-activated concrete material prepared by using vitamins as additives |
| CN116003024A (en) * | 2022-11-25 | 2023-04-25 | 新汶矿业集团地质勘探有限责任公司 | High-strength separation layer grouting material and mixing device thereof |
| CN116535176A (en) * | 2023-04-11 | 2023-08-04 | 哈尔滨理工大学 | Material for repairing cracks of concrete pavement and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451853A (en) * | 2019-04-26 | 2019-11-15 | 中国海洋大学 | A kind of alkali-activated carbonatite industrial residue seawater coral aggregate concrete and preparation method thereof |
-
2021
- 2021-09-26 CN CN202111128488.2A patent/CN113788646A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451853A (en) * | 2019-04-26 | 2019-11-15 | 中国海洋大学 | A kind of alkali-activated carbonatite industrial residue seawater coral aggregate concrete and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 卢祎苗等: "矿渣—粉煤灰基地聚合物性能研究", 《吉林建筑大学学报》 * |
| 孙晋良主编: "《纤维新材料》", 31 August 2007, 上海大学出版社 * |
| 杨晓庆: "碱激发粉煤灰/矿渣自收缩机理研究", 《中国优秀博硕士学位论文全文数据库（硕士）工程科技Ⅰ辑》 * |
| 郇坤: "纤维增强碱激发矿粉材料的物理力学性能研究", 《粉煤灰综合利用》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010414A (en) * | 2022-06-08 | 2022-09-06 | 安徽理工大学 | Alkali-activated concrete material prepared by using vitamins as additives |
| CN116003024A (en) * | 2022-11-25 | 2023-04-25 | 新汶矿业集团地质勘探有限责任公司 | High-strength separation layer grouting material and mixing device thereof |
| CN116003024B (en) * | 2022-11-25 | 2024-05-14 | 新汶矿业集团地质勘探有限责任公司 | High-strength separation layer grouting material and mixing device thereof |
| CN116535176A (en) * | 2023-04-11 | 2023-08-04 | 哈尔滨理工大学 | Material for repairing cracks of concrete pavement and preparation method thereof |
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