CN113666676A - Underwater concrete repairing and reinforcing material and preparation method thereof - Google Patents
Underwater concrete repairing and reinforcing material and preparation method thereof Download PDFInfo
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- CN113666676A CN113666676A CN202110891885.9A CN202110891885A CN113666676A CN 113666676 A CN113666676 A CN 113666676A CN 202110891885 A CN202110891885 A CN 202110891885A CN 113666676 A CN113666676 A CN 113666676A
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- 239000004567 concrete Substances 0.000 title claims abstract description 63
- 239000012779 reinforcing material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 47
- 239000004568 cement Substances 0.000 claims abstract description 22
- 230000008439 repair process Effects 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 19
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- 239000004927 clay Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
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- 238000003756 stirring Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 229920001046 Nanocellulose Polymers 0.000 claims description 5
- 229960000892 attapulgite Drugs 0.000 claims description 4
- 229910052625 palygorskite Inorganic materials 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 2
- 239000010438 granite Substances 0.000 claims description 2
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 2
- 239000004137 magnesium phosphate Substances 0.000 claims description 2
- 229960002261 magnesium phosphate Drugs 0.000 claims description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 2
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 2
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 2
- 238000010306 acid treatment Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
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- 238000006703 hydration reaction Methods 0.000 abstract description 6
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Images
Classifications
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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
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/04—Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
-
- 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
- C04B22/08—Acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
-
- 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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an underwater concrete repairing and reinforcing material. The repair reinforcement material comprises the following raw materials in percentage by mass: 10-20% of cement, 10-15% of fly ash, 15-25% of river sand, 15-20% of broken stone, 1-3% of clay conditioning agent, 1-3% of nano-cellulose, 0.3-0.5% of polycarboxylic acid water reducing agent, 0.3-0.5% of flocculating agent, 0.3-0.5% of antifreezing agent, 0.3-0.5% of air entraining agent, 3-5% of alkaline exciting agent and the balance of water. The clay conditioning agent adopted by the invention belongs to 2:1 type multi-dimensional inorganic clay minerals, provides additional reactive active sites for the nucleation growth process of hydration products, reduces the alkalinity environment of a matrix, promotes Si-O bonds to gradually polymerize into Si-O-Si bonds, can adjust the setting time of slurry, has a certain physical crosslinking effect, and can improve the working performance and mechanical performance of concrete materials.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an underwater concrete repair reinforcing material and a preparation method thereof.
Background
Heretofore, concrete has remained one of the most dominant and most used building materials in underwater construction. The performance of concrete will directly affect the quality and progress of underwater work. Therefore, the research on the performance of underwater concrete and the construction technology are receiving more and more attention from the engineering technology field. When ordinary concrete is directly poured in a water environment, the effects of separation, cement loss and strength reduction can be caused by the influence of water, and environmental pollution can be caused. Therefore, it is necessary to improve the conventional underwater concrete to overcome the above-mentioned drawbacks.
Compared with the foreign advanced technology, the integral technology of the underwater undispersed concrete in China has certain gap, mainly including poor construction performance, backward matched construction technology, low integral strength and relatively poor durability. At present, the core of most underwater undispersed concrete technologies is to add an anti-dispersant into common concrete, and form a network structure with strong adsorption capacity by mutual attraction, crossing and entanglement of long-chain molecules, so as to adsorb particles such as cement, aggregate and the like together. So that the concrete can keep the components adhered together when meeting water. However, most of the anti-dispersing agents are difficult to satisfy the requirements that underwater undispersed concrete has good construction performance, mechanical strength and durability while having good stability. The comprehensive performance research of the underwater concrete needs to consider not only the composition of concrete composition materials and the self composition of the anti-dispersing agent, but also the construction method and the construction environment influence. Therefore, the comprehensive performance of the underwater concrete is cooperatively regulated and controlled by multiple components, and corresponding formula design and optimization are carried out, so that the concrete material has good underwater stability, excellent working performance, high mechanical strength, excellent durability and controllable cost, and has very important significance and value for the construction of underwater engineering.
Disclosure of Invention
The invention aims to provide an underwater concrete repairing and reinforcing material which is difficult to disperse underwater, good in stability, early-strength, quick-hardening and excellent in mechanical property, aiming at the defects in the prior art.
The invention relates to an underwater concrete repair reinforcing material which comprises the following raw materials in percentage by mass: 10-20% of cement, 10-15% of fly ash, 15-25% of river sand, 15-20% of broken stone, 1-3% of clay conditioning agent, 1-3% of nano-cellulose, 0.3-0.5% of polycarboxylic acid water reducing agent, 0.3-0.5% of flocculating agent, 0.3-0.5% of antifreezing agent, 0.3-0.5% of air entraining agent, 3-5% of alkaline exciting agent and the balance of water, wherein the sum of the mass percentages of the components is 100%.
Further, the cement is one of sulphoaluminate cement or magnesium phosphate cement.
Further, the fly ash is C-grade fly ash, and the CaO content is more than 10%.
Furthermore, the river sand comprises 35-45% of medium sand with the particle size of 0.5-0.25mm and 55-65% of fine sand with the particle size of less than 0.075 mm.
Furthermore, the broken stone is granite broken stone with the particle size larger than 4.75mm and smaller than 15 mm.
Further, the clay conditioning agent is one of attapulgite or montmorillonite minerals with the particle size of 300 meshes.
Further, the nano-cellulose is obtained by treating and extracting plants with sulfuric acid.
Further, the water reducing agent is a powdery high-performance polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is more than or equal to 20%, the gas content is less than or equal to 5%, and the 1d strength ratio is more than or equal to 160%.
Further, the alkali activator is prepared by mixing water glass and granular sodium hydroxide.
The preparation method of the underwater concrete repairing and reinforcing material comprises the following steps:
s1, stirring the raw materials in percentage by mass in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water, a water reducing agent, a flocculating agent, an antifreezing agent, an air entraining agent and an alkaline activator into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the underwater concrete repairing and reinforcing material.
Compared with the prior art, the preparation method of the underwater concrete repairing and reinforcing material has the following beneficial effects:
1. the invention designs the powder material proportioning range according to the hydration activity enhancement principle, and a compact blank with good water resistance can be obtained after curing and forming. The prepared underwater concrete repairing and reinforcing material has good fluidity, the 1d compressive strength is more than or equal to 30MPa, the 28d compressive strength is more than or equal to 50MPa, the 7-day land-water strength ratio is about 75%, and the 28-day land-water strength ratio is about 90%.
2. The nano-cellulose used in the invention is nano-scale natural fiber obtained by purifying plant fiber with sulfuric acid. The nano-porous water-retaining agent contains more nano-pores under the microscale, and can realize the internal maintenance effect of water retention and water storage.
3. The invention has the advantages of convenient construction, simple process, good underwater construction performance, small shrinkage, strong stability and excellent durability.
4. The invention adopts NaOH solution and water glass solution to excite the activity of Al-O, Si-O bond in the fly ash, and utilizes alkaline exciting agent, mineral admixture and organic admixture to realize high strength of concrete material.
5. The clay conditioning agent adopted by the invention belongs to 2:1 type multi-dimensional inorganic clay minerals, the introduction of the clay minerals can provide additional reaction active sites for the nucleation growth process of hydration products, the introduction of the clay minerals can reduce the alkalinity environment of a matrix to a certain extent, promote Si-O bonds to be gradually polymerized into Si-O-Si bonds, and is beneficial to generating the hydration products of C-S-H and the like with high polymerization degree. Meanwhile, the multidimensional clay mineral can adjust the setting time of the slurry and has a certain physical crosslinking effect, so that the working performance and the mechanical performance of the concrete material can be greatly improved. For example, the introduction of the attapulgite is helpful for accelerating the early hydration process, can obviously improve the early mechanical property of the material, can better adjust the flow property and the setting property of concrete slurry, and can obviously improve the mechanical strength and the water resistance of the material. And the attapulgite is fibrous under the microscopic scale, which is helpful for generating bridging action among all components in the slurry and enhancing cohesiveness.
6. According to the invention, by adopting a mixed compounding technology, a clay regulator and nanocellulose are introduced into a concrete system to regulate the anti-dispersion performance of the concrete system, functional additives such as a water reducing agent and a flocculating agent are added, and the pozzolanic activity of the fly ash is excited by cement hydration and an alkaline exciting agent to form the underwater concrete repair reinforcing material, so that the underwater concrete repair reinforcing material not only meets the better stability of the underwater concrete, but also improves the setting performance, mechanical toughness and durability of the material in a severe environment, and the prepared concrete material has the advantages of good underwater stability, high early mechanical strength and excellent durability, can be better constructed underwater and can reach higher strength in the early stage, is very suitable for quick repair and maintenance of underwater engineering, plays a role in the underwater engineering, realizes the functionalization and high-valued of a product, and has good economic benefits.
Drawings
Fig. 1 is a flow chart of a preparation method of the underwater concrete repair reinforcing material of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in figure 1, the underwater concrete repair reinforcing material and the preparation method thereof comprise the following raw materials in percentage by mass: 10-20% of cement, 10-15% of fly ash, 15-25% of river sand, 15-20% of broken stone, 1-3% of clay conditioning agent, 1-3% of nano-cellulose, 0.3-0.5% of polycarboxylic acid water reducing agent, 0.3-0.5% of flocculating agent, 0.3-0.5% of antifreezing agent, 0.3-0.5% of air entraining agent, 3-5% of alkaline exciting agent and the like, wherein the balance is water, and the sum of the mass percentages of the components is 100%. The underwater concrete repairing and reinforcing material prepared by the invention has good fluidity, cohesiveness and filling property, can be quickly condensed during construction in an underwater environment, and ensures the strength and stability of concrete.
The invention provides a preparation method of an underwater concrete repairing and reinforcing material, which comprises the following steps in percentage by mass:
s1, stirring cement, fly ash, river sand, gravel, clay regulator, nano cellulose and the like in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water, a water reducing agent, a flocculating agent, an antifreezing agent, an air entraining agent and an alkaline activator into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the underwater anti-dispersion concrete repairing material.
Several examples of the underwater concrete repair reinforcing material of the present invention are given below, and the above method is exemplified by referring to the examples.
Example 1
The material comprises the following raw materials in percentage by mass: 10% of cement, 15% of fly ash, 25% of river sand, 20% of gravel, 1% of clay regulator, 1% of nano-cellulose, 0.3% of polycarboxylic acid water reducer, 0.3% of flocculant, 0.3% of anti-freezing agent, 0.3-0.5% of air entraining agent, 3% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the components is 100%.
The preparation process comprises the following steps:
s1, stirring cement, fly ash, river sand, gravel, clay regulator, nano cellulose and the like in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water, a water reducing agent, a flocculating agent, an antifreezing agent, an air entraining agent and an alkaline activator into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the underwater concrete repairing and reinforcing material.
Example 2
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 12% of cement, 12% of fly ash, 20% of river sand, 15% of broken stone, 2% of clay conditioning agent, 2% of nano-cellulose, 0.3% of polycarboxylic acid water reducing agent, 0.3% of flocculating agent, 0.3% of antifreezing agent, 0.3% of air entraining agent, 4% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the above components is 100%.
The preparation procedure was the same as in example 1.
Example 3
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 15% of cement, 13% of fly ash, 20% of river sand, 17% of broken stone, 2% of clay regulator, 2% of nano-cellulose, 0.4% of polycarboxylate superplasticizer, 0.5% of flocculant, 0.3% of anti-freezing agent, 0.3% of air entraining agent, 5% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the above components is 100%.
The preparation procedure was the same as in example 1.
Example 4
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 18% of cement, 15% of fly ash, 15% of river sand, 20% of gravel, 1.5% of clay conditioning agent, 1.5% of nano-cellulose, 0.3% of polycarboxylic acid water reducing agent, 0.4% of flocculating agent, 0.3% of antifreezing agent, 0.3% of air entraining agent, 3% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the components is 100%.
The preparation procedure was the same as in example 1.
Example 5
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 12% of cement, 15% of fly ash, 25% of river sand, 20% of gravel, 3% of clay conditioning agent, 1% of nano-cellulose, 0.5% of polycarboxylic acid water reducing agent, 0.5% of flocculating agent, 0.4% of anti-freezing agent, 0.4% of air entraining agent, 5% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the above components is 100%.
The preparation procedure was the same as in example 1.
Comparative example 1
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 20% of cement, 15% of fly ash, 25% of river sand, 20% of gravel, 0.5% of polycarboxylate superplasticizer, 0.5% of flocculant, 0.4% of antifreeze, 0.4% of air entraining agent, 5% of alkaline activator and the like, wherein the balance is water, and the sum of the mass percentages of the components is 100%.
The preparation procedure was the same as in example 1.
Comparative example 2
The underwater concrete repairing and reinforcing material comprises the following raw materials in percentage by mass: 20% of cement, 20% of fly ash, 25% of river sand, 20% of gravel, 3% of clay regulator, 1% of nano-cellulose, 0.5% of polycarboxylic acid water reducing agent, 0.5% of flocculant, 0.4% of anti-freezing agent, 0.4% of air entraining agent and the like, wherein the balance is water, and the sum of the mass percentages of the components is 100%.
The preparation procedure was the same as in example 1.
The underwater concrete repair reinforcing material prepared in the embodiments 1 to 5 of the invention is subjected to performance index tests such as compressive strength, fluidity, land-water ratio and the like, and the test results are shown in table 1.
As can be seen from the table, the compressive strength of the repair reinforcing material prepared in the embodiment exceeds 50MPa in 28 days, the land-water strength ratio in 7 days is about 75%, and the land-water strength ratio in 28 days can reach about 90%. The concrete repairing and reinforcing material prepared by the method has the characteristics of high mechanical strength and excellent stability. Comparative examples 1 and 2 lack clay conditioner and nanocellulose and alkali activator components, respectively. As can be seen from the results in Table 1, the mechanical properties of the concrete repair reinforcing material are obviously reduced after the related components are lacked, and the difference of the water and land properties is increased. And the workability of the slurry was also found to be deteriorated during the preparation process.
Table 1 table of performance index test results of the reinforcing material for repairing underwater concrete prepared in examples 1 to 7
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above is not relevant and is applicable to the prior art.
While certain specific embodiments of the present invention have been described in detail by way of illustration, it will be understood by those skilled in the art that the foregoing is illustrative only and is not limiting of the scope of the invention, as various modifications or additions may be made to the specific embodiments described and substituted in a similar manner by those skilled in the art without departing from the scope of the invention as defined in the appending claims. It should be understood by those skilled in the art that any modifications, equivalents, improvements and the like made to the above embodiments in accordance with the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The underwater concrete repairing and reinforcing material is characterized by comprising the following raw materials in percentage by mass: 10-20% of cement, 10-15% of fly ash, 15-25% of river sand, 15-20% of broken stone, 1-3% of clay conditioning agent, 1-3% of nano-cellulose, 0.3-0.5% of polycarboxylic acid water reducing agent, 0.3-0.5% of flocculating agent, 0.3-0.5% of antifreezing agent, 0.3-0.5% of air entraining agent, 3-5% of alkaline exciting agent and the balance of water, wherein the sum of the mass percentages of the components is 100%.
2. The underwater concrete repair reinforcing material of claim 1, wherein the cement is one of a sulphoaluminate cement or a magnesium phosphate cement.
3. The underwater concrete repair reinforcing material of claim 1, wherein the fly ash is class C fly ash, and the CaO content is greater than 10%.
4. The underwater concrete repair reinforcing material as claimed in claim 1, wherein the river sand is composed of 35-45% by mass of medium sand of 0.5-0.25mm and 55-65% by mass of fine sand with a particle size of less than 0.075 mm.
5. The underwater concrete repair reinforcing material of claim 1, wherein the crushed stone is granite crushed stone with a grain size of more than 4.75mm and less than 15 mm.
6. The underwater concrete repair reinforcing material of claim 1, wherein the clay conditioning agent is one of attapulgite or montmorillonite minerals with a particle size of 300 meshes.
7. The underwater concrete repair reinforcement material according to claim 1, wherein the nanocellulose is extracted from a plant by a sulfuric acid treatment.
8. The underwater concrete repair reinforcing material of claim 1, wherein the water reducing agent is a powdery high-performance polycarboxylate water reducing agent, and has a water reducing rate of not less than 20%, a gas content of not more than 5%, and a 1d strength ratio of not less than 160%.
9. The underwater concrete repair reinforcing material of claim 1, wherein the alkali activator is prepared by mixing water glass and granular sodium hydroxide.
10. The method for preparing the underwater concrete repair reinforcing material as claimed in any one of claims 1 to 9, comprising the steps of:
s1, stirring the raw materials in percentage by mass in a stirrer for 1-2 min, and uniformly mixing to obtain a dry mixture;
s2, adding water, a water reducing agent, a flocculating agent, an antifreezing agent, an air entraining agent and an alkaline activator into the dry mixture prepared in the step S1, mixing and stirring for 2-5 min until the mixture has good fluidity, and preparing slurry;
s3, pouring the slurry prepared in the step S2 into a mold, vibrating uniformly, finishing and plastering, and standing for forming to obtain a blank;
and S4, placing the blank prepared in the step S3 in a curing box, curing, and then demolding to obtain the underwater concrete repairing and reinforcing material.
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| CN114105542A (en) * | 2021-12-17 | 2022-03-01 | 武汉博宏建设集团有限公司 | Waterproof self-repairing material for building and preparation method thereof |
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| US20150072902A1 (en) * | 2012-04-13 | 2015-03-12 | Schlumberger Technology Corporation | Fluids and Methods Including Nanocellulose |
| US20180037795A1 (en) * | 2015-04-10 | 2018-02-08 | Halliburton Energy Services, Inc. | Downhole fluids and methods of use thereof |
| CN112456927A (en) * | 2020-11-16 | 2021-03-09 | 辽宁省交通高等专科学校 | Graphene oxide/polymer modified cement-based repair mortar and preparation method thereof |
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| US20150072902A1 (en) * | 2012-04-13 | 2015-03-12 | Schlumberger Technology Corporation | Fluids and Methods Including Nanocellulose |
| US20180037795A1 (en) * | 2015-04-10 | 2018-02-08 | Halliburton Energy Services, Inc. | Downhole fluids and methods of use thereof |
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| CN114105542A (en) * | 2021-12-17 | 2022-03-01 | 武汉博宏建设集团有限公司 | Waterproof self-repairing material for building and preparation method thereof |
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