CN111153661B - Sulphoaluminate cement-based material for ocean repairing protection engineering and preparation method thereof - Google Patents
Sulphoaluminate cement-based material for ocean repairing protection engineering and preparation method thereof Download PDFInfo
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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
- C04B28/02—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
- C04B28/06—Aluminous cements
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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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
- 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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Abstract
The invention discloses a sulphoaluminate cement-based material for ocean repairing protection engineering and a preparation method thereof, belonging to the technical field of cement-based materials. The cement-based material comprises 100 parts of sulphoaluminate cement, 30-60 parts of fly ash, 10-40 parts of silica fume, 350 parts of modified filler, 2-5 parts of early strength agent, 1-3 parts of water reducing agent, 0.02-0.04 part of air entraining agent and 60-70 parts of water. Preparing the modified filler: a, preparing a polyvinyl alcohol aqueous solution with the mass concentration of 3-4% to obtain a modified solution; and b, soaking the filler composition in the modification liquid while stirring for 1-2h, taking out and drying to obtain the modified diatomite filler, wherein the filler composition comprises sand, diatomite and silicon carbide powder which are uniformly mixed according to the weight ratio of 1 (0.05-0.3) to 0.02-0.2. The preparation of the cement-based material comprises the following steps: a, preparing a modified filler; b, uniformly mixing the raw material components, wherein the stirring speed is 400-500rpm, and the stirring time is 5-10 min. The cement-based material has higher strength and seawater erosion resistance, and is suitable for being used as a repairing material of marine concrete.
Description
Technical Field
The invention relates to the technical field of cement-based materials, in particular to a sulphoaluminate cement-based material for ocean repair protection engineering and a preparation method thereof.
Background
With the development and utilization of ocean resources, ocean engineering buildings are constructed in large quantities, and meanwhile, the concrete in the ocean environment is widely applied. The corrosion of harmful ions in the marine environment can cause surface cracking of marine concrete, the service life of marine concrete members is seriously shortened, the application safety problem of marine engineering buildings is caused, and considerable economic loss can be caused if the marine engineering buildings are rebuilt.
In order to solve the problems, the repair of the cracked marine concrete surface by adopting the cement-based material is one of the main countermeasures. Cementitious materials typically include cement, sand, additives, and the like. The cement-based material is coated on the surface cracking part of the ocean engineering building to prevent the further development of cracks.
Therefore, the cement-based materials for the marine repair protection project are required to have higher strength and seawater erosion resistance, so that the cement-based materials can better resist the erosion and corrosion of seawater.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the following steps: provides a sulphoaluminate cement-based material for ocean repairing protection engineering, so as to achieve the effects of improving the strength and resisting seawater erosion.
The first purpose of the invention is realized by the following technical scheme:
a sulphoaluminate cement-based material for ocean repairing protection engineering comprises the following components in parts by weight: 100 parts of sulphoaluminate cement, 30-60 parts of fly ash, 10-40 parts of silica fume, 350 parts of modified filler, 2-5 parts of early strength agent, 1-3 parts of water reducing agent, 0.02-0.04 part of air entraining agent and 60-70 parts of water;
the preparation of the modified filler comprises the following steps:
preparing a polyvinyl alcohol aqueous solution with the mass concentration of 3-4%, and adding a defoaming agent accounting for 0.05-0.07% of the mass fraction of the polyvinyl alcohol aqueous solution in the preparation process to obtain a modified solution;
and b, soaking the filler composition into the modified liquid obtained in the step a while stirring for 1-2h, taking out and drying to obtain the modified filler, wherein the filler composition comprises sand, diatomite and silicon carbide powder which are uniformly mixed according to the weight ratio of 1 (0.05-0.3) to (0.02-0.2).
By adopting the scheme, the sand in the traditional cement-based material is modified to obtain the modified filler. In the preparation process of the modified filler, firstly, a modifying solution mainly containing polyvinyl alcohol is prepared, then, sand, diatomite and silicon carbide powder in a proper proportion are soaked in the modifying solution, and the modified filler is obtained after drying. In the modified filler, diatomite, silicon carbide powder and polyvinyl alcohol are coated on the surface of sand particles together. Experimental data show that the cement-based material with high strength and high seawater corrosion resistance is obtained by using the modified filler for preparing the cement-based material.
The reason may be that the diatomite and the silicon carbide powder wrapped on the outer surface of the sand improve the fluidity of the sand, and the polyvinyl alcohol further performs hydrophobic treatment on the diatomite and the silicon carbide powder, so that the dispersibility of the diatomite and the silicon carbide powder is improved, and the fluidity of the sand is further improved, thereby greatly improving the compactness of the set cement-based material, and further improving the strength and seawater corrosion resistance of the set cement-based material.
After the cement-based material is adopted to repair cracks on the surface of the marine concrete, the repaired part can better resist the erosion and corrosion of seawater.
The invention is further configured to: in the step b of preparing the modified filler, the filler composition comprises sand, diatomite and silicon carbide powder in a weight ratio of 1 (0.1-0.15) to (0.05-0.1).
Experiments show that the weight ratio among the sand, the diatomite and the silicon carbide powder has certain influence on the strength and the seawater corrosion resistance of the cement-based material. By adopting the scheme, the weight ratio of the sand, the diatomite and the silicon carbide powder is limited within the range, and the obtained cement-based material has better strength and seawater erosion resistance.
The invention is further configured to: the fineness modulus of the sand is 1.6-2.2, and the mud content is 5-6%.
In the building material, whether concrete containing coarse aggregate or cement-based material without coarse aggregate, etc., the mud content in the adopted stone and sand is generally not more than 3-4%. This is because, when the mud content in the stone or sand is too high, it seriously affects the interfacial crosslinking degree of the stone or sand, thereby seriously affecting the strength of the concrete or cement-based material. By adopting the scheme, the cement-based material prepared by the method still has better strength even if the mud content of the adopted sand exceeds 4 percent and is 5 to 6 percent. This shows that the cement-based material of the present invention is not sensitive to the mud content of sand, which is of great significance for practical application.
The invention is further configured to: the weight ratio of the sulphoaluminate cement to the fly ash to the siliceous dust is 1 (0.4-0.5) to 0.2-0.3.
The sulphoaluminate cement belongs to special cement and has a plurality of excellent performances such as high early strength, good impermeability, corrosion resistance and the like. However, the cost is higher than that of ordinary portland cement, which limits the application of sulphoaluminate cement to some extent.
The fly ash is fine ash captured from flue gas generated after coal combustion, and comprises SiO as main component2、Al2O3、FeO、Fe2O3、CaO、TiO2And the like. The silica fume is a byproduct in large-scale industrial smelting, and the main component is SiO2And the like.
By adopting the scheme, the fly ash and the silica fume are selected to replace part of the sulphoaluminate cement in a large proportion, so that the using amount of the sulphoaluminate cement is reduced, the production cost is reduced, and the waste utilization of the fly ash and the silica fume is realized.
Experimental data show that the weight ratio between the sulphoaluminate cement, the fly ash and the silica fume has a certain influence on the strength of the cement-based material of the invention, which may be related to the fact that the fly ash and the silica fume can inhibit the drying shrinkage of the cement-based material of the invention. Furthermore, the weight ratio of the sand, the diatomaceous earth and the silicon carbide powder is limited to the above range, and the strength of the cement-based material can be further improved although the influence on the seawater erosion resistance of the cement-based material is not great.
The invention is further configured to: the early strength agent is calcium formate, the water reducing agent is polycarboxylic acid water reducing agent, and the weight ratio of the early strength agent to the water reducing agent is 1 (0.6-0.9).
Experiments show that the early strength agent and the water reducing agent have synergistic effect on the strength and seawater corrosion resistance of the cement-based material, and when the weight ratio of the early strength agent to the water reducing agent is within the range, the obtained cement-based material has better strength and seawater corrosion resistance.
The invention is further configured to: the air entraining agent is rosin air entraining agent.
The invention is further configured to: the defoaming agent is an organic silicon defoaming agent.
The second purpose of the invention is that: the preparation method of the sulphoaluminate cement-based material for the marine repair protection engineering comprises the following steps:
a, preparing a modified filler;
and b, uniformly mixing the raw material components of the sulphoaluminate cement-based material for the ocean repairing protection project according to the parts by weight to obtain the sulphoaluminate cement-based material for the ocean repairing protection project, wherein the stirring speed is 400 plus materials and 500rpm, and the stirring time is 5-10 min.
In conclusion, the invention has the following beneficial effects:
1. the cement-based material disclosed by the invention has high strength and high seawater erosion resistance, and can be used for repairing cracks on the surface of marine concrete;
2. the invention provides a thought of adopting diatomite, silicon carbide powder and polyvinyl alcohol to carry out composite modification on sand, which is beneficial to obtaining a cement-based material with high strength and high seawater erosion resistance;
3. the cement-based material is insensitive to the mud content of sand, which has important significance for practical application;
4. according to the invention, two mineral admixtures of fly ash and silica fume are selected to replace part of sulphoaluminate cement in a large proportion, so that the production cost is reduced;
5. the invention provides a thought for improving the strength and seawater corrosion resistance of a cement-based material by compounding an early strength agent calcium formate and a polycarboxylic acid water reducing agent.
Detailed Description
The present invention will be described in further detail below.
Introduction of raw materials
Sulphoaluminate cement: strength grade 42.5R, initial setting time 0.2h, cat # S23558, purchased from cement limited, group electing; fly ash: the first-class is purchased from the market of the Shuoyangda mineral products in the lotus pool area of Baoding;
silica fume: 325 mesh, silicon content more than or equal to 98%, purchased from processing plants of mineral products in mountain and Sichuan of Lingshou county;
early strength agent: calcium formate, Alfa-a18916, 98%, standard, available from national pharmaceutical group chemical agents ltd;
water reducing agent: the polycarboxylic acid water reducing agent is of industrial grade and purchased from the commercial business of splendid chemical products in Jinshui district of Zhengzhou city;
air entraining agent: a rosin air entraining agent, model HS-AA, purchased from Jinan Runfeng auxiliary agent, Inc.;
polyvinyl alcohol: the product is Aldrich-81381, and is purchased from chemical reagents of national drug group;
defoaming agent: an organic silicon defoamer, the model of which is DL-1165, purchased from Detian New materials Co., Ltd, Huizhou city;
sand: the fineness modulus is 1.6-2.2, and the mud content is 5-6%;
diatomite: model 400, purchased from gold mine industry processing factory in Lingshou county, Hebei province;
silicon carbide powder: 1000 mesh, available from New cast gold (Tianjin) materials Co.
Example 1
A sulphoaluminate cement-based material for ocean repairing protection engineering comprises the following components in parts by weight: 100 parts of sulphoaluminate cement, 30 parts of fly ash, 40 parts of silica fume, 300 parts of modified filler, 5 parts of early strength agent, 1 part of water reducing agent, 0.04 part of air entraining agent and 60 parts of water;
the preparation of the modified filler comprises the following steps:
preparing a polyvinyl alcohol aqueous solution with the mass concentration of 3%, and adding a defoaming agent accounting for 0.07% of the mass fraction of the polyvinyl alcohol aqueous solution in the preparation process to obtain a modified solution;
b, soaking the filler composition into the modified liquid obtained in the step a while stirring for 1h, taking out and drying to obtain the modified filler, wherein the filler composition comprises sand, diatomite and silicon carbide powder which are uniformly mixed in a weight ratio of 1:0.05: 0.2;
the preparation method of the sulphoaluminate cement-based material for the marine repair protection engineering comprises the following steps:
a, preparing a modified filler;
and b, uniformly mixing the raw material components of the sulphoaluminate cement-based material for the ocean repairing protection project according to the parts by weight to obtain the sulphoaluminate cement-based material for the ocean repairing protection project, wherein the stirring speed is 400rpm, and the stirring time is 5 min.
Example 2
A sulphoaluminate cement-based material for ocean repairing protection engineering comprises the following components in parts by weight: 100 parts of sulphoaluminate cement, 45 parts of fly ash, 25 parts of silica fume, 330 parts of modified filler, 3 parts of early strength agent, 2.2 parts of water reducing agent, 0.03 part of air entraining agent and 65 parts of water, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.45:0.25, and the weight ratio of the early strength agent to the water reducing agent is 1: 0.73;
the preparation of the modified filler comprises the following steps:
preparing a polyvinyl alcohol aqueous solution with the mass concentration of 3.5%, and adding a defoaming agent accounting for 0.06% of the mass fraction of the polyvinyl alcohol aqueous solution in the preparation process to obtain a modified solution;
b, soaking the filler composition into the modified liquid obtained in the step a while stirring for 1.5 hours, taking out and drying to obtain the modified filler, wherein the filler composition comprises sand, diatomite and silicon carbide powder which are uniformly mixed according to the weight ratio of 1:0.12: 0.07;
the preparation method of the sulphoaluminate cement-based material for the marine repair protection engineering comprises the following steps:
a, preparing a modified filler;
and b, uniformly mixing the raw material components of the sulphoaluminate cement-based material for the ocean repairing protection project according to the parts by weight to obtain the sulphoaluminate cement-based material for the ocean repairing protection project, wherein the stirring speed is 450rpm, and the stirring time is 7 min.
Example 3
A sulphoaluminate cement-based material for ocean repairing protection engineering comprises the following components in parts by weight: 100 parts of sulphoaluminate cement, 60 parts of fly ash, 10 parts of silica fume, 350 parts of modified filler, 2 parts of early strength agent, 3 parts of water reducing agent, 0.02 part of air entraining agent and 70 parts of water;
the preparation of the modified filler comprises the following steps:
preparing a polyvinyl alcohol aqueous solution with the mass concentration of 4%, and adding a defoaming agent accounting for 0.05% of the mass fraction of the polyvinyl alcohol aqueous solution in the preparation process to obtain a modified solution;
b, soaking the filler composition into the modified liquid obtained in the step a while stirring for 2 hours, taking out and drying to obtain the modified filler, wherein the filler composition comprises sand, diatomite and silicon carbide powder which are uniformly mixed according to the weight ratio of 1:0.3: 0.02;
the preparation method of the sulphoaluminate cement-based material for the marine repair protection engineering comprises the following steps:
a, preparing a modified filler;
and b, uniformly mixing the raw material components of the sulphoaluminate cement-based material for the ocean repairing protection project according to the parts by weight to obtain the sulphoaluminate cement-based material for the ocean repairing protection project, wherein the stirring speed is 500rpm, and the stirring time is 10 min.
Example 4
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder which are uniformly mixed in a weight ratio of 1:0.1: 0.1.
Example 5
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder in a weight ratio of 1:0.15:0.05, mixed uniformly.
Example 6
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder in a weight ratio of 1:0.05:0.2 and mixed uniformly.
Example 7
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder in a weight ratio of 1:0.3:0.02, which are uniformly mixed.
Example 8
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 40 parts of fly ash and 30 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.4: 0.3.
Example 9
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 50 parts of fly ash and 20 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.5: 0.2.
Example 10
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 30 parts of fly ash and 40 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.3: 0.4.
Example 11
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 60 parts of fly ash and 10 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.6: 0.1.
Example 12
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 3.3 parts of an early strength agent and 2 parts of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 0.6.
Example 13
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 2.8 parts of an early strength agent and 2.5 parts of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 0.9.
Example 14
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 5 parts of an early strength agent and 1 part of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 0.2.
Example 15
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 2 parts of an early strength agent and 3 parts of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 1.5.
Comparative example 1
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder which are uniformly mixed in a weight ratio of 1:0.02: 0.3.
Comparative example 2
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the filler composition comprises sand, diatomaceous earth and silicon carbide powder which are uniformly mixed in a weight ratio of 1:0.4: 0.01.
Comparative example 3
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 68 parts of fly ash and 2 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.68: 0.02.
Comparative example 4
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 20 parts of fly ash and 50 parts of silica fume, wherein the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1:0.2: 0.5.
Comparative example 5
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 6 parts of an early strength agent and 0.3 part of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 0.05.
Comparative example 6
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: 1.5 parts of an early strength agent and 4 parts of a water reducing agent, wherein the weight ratio of the early strength agent to the water reducing agent is 1: 2.67.
Comparative example 7
A sulphoaluminate cement-based material for ocean repairing protection engineering is different from the sulphoaluminate cement-based material in example 2 in that: the modified filler is replaced by sand with equal weight, namely the sand which is not subjected to modification treatment is adopted.
Performance detection
And (3) testing the compressive strength: the cement-based materials obtained in examples 1-15 and comparative examples 1-6 were tested for compressive strength for 2h, 3d and 28d, according to the provisions of GB/T17671-1999 "Cement mortar Strength test method".
And (3) testing seawater erosion resistance: the cement-based materials obtained in examples 1 to 15 and comparative examples 1 to 6 were prepared into samples of 70mm × 70mm × 70mm, respectively, and the samples were left at room temperature for 28 days and then soaked in seawater for 6 months and 12 months. The average mass fraction of water-soluble chloride ions at the penetration depth of 2-2.5cm of a sample soaked in seawater was measured according to the regulation of JTJ270-98 "determination of water-soluble chloride ion content of mortar in concrete" of Water transportation engineering concrete test Specification ".
The results of the above-described compressive strength test and seawater erosion resistance test are shown in table 1.
TABLE 1 compression Strength test and seawater erosion test results
As can be seen from Table 1, the cement-based materials prepared in examples 1-3 have better compressive strength and seawater erosion resistance, and the compressive strength of 2h can reach 19.9-20.4MPa, and the early strength performance is better, so that the repair requirement of the marine concrete is met. It can be seen from example 2 and comparative example 7 that the modification treatment of sand plays a key role in improving the compressive strength and seawater erosion resistance of the cement-based material of the present invention.
Continuing to compare examples 2, 4-7 and comparative examples 1-2, it can be seen that the weight ratio between sand, diatomaceous earth and silicon carbide powder has some effect on the compressive strength and seawater erosion resistance of the cement-based material of the present invention. According to the invention, when the weight ratio of the sand, the diatomite and the silicon carbide powder is 1 (0.05-0.3) to (0.02-0.2), the compression strength and the seawater corrosion resistance of the cement-based material are better, and when the weight ratio of the sand, the diatomite and the silicon carbide powder is 1 (0.1-0.15) to (0.05-0.1), the compression strength and the seawater corrosion resistance of the cement-based material are better. The reasons may be: the diatomite and the silicon carbide powder wrapped on the outer surface of the sand improve the fluidity of the sand, and the polyvinyl alcohol further performs hydrophobic treatment on the diatomite and the silicon carbide powder, so that the dispersibility of the diatomite and the silicon carbide powder is improved, the fluidity of the sand is further improved, the compactness of the set cement-based material is greatly improved, the strength and the seawater erosion resistance of the set cement-based material are improved, and when the weight ratio of the sand, the diatomite and the silicon carbide powder is in a proper range, the sand is better modified.
Continuing to compare examples 2, 8-11 and comparative examples 3-4, it can be seen that the weight ratio between the sulphoaluminate cement, fly ash and silica fume has little effect on the seawater erosion resistance of the cement-based material of the invention, but has some effect on its compressive strength. According to the invention, when the weight ratio of the sulphoaluminate cement to the fly ash to the silica fume is 1 (0.4-0.5) to 0.2-0.3), the compression strength of the cement-based material is higher. The reasons may be: the fly ash and the silica fume with proper proportion can inhibit the drying shrinkage of the cement-based material, thereby improving the strength of the cement-based material. In addition, the fly ash and the silica fume are selected to replace part of the sulphoaluminate cement in a large proportion, so that the use amount of the sulphoaluminate cement with higher price is reduced, the production cost is reduced, and the waste utilization of the fly ash and the silica fume is realized.
Continuing to compare examples 2, 12-15 and comparative examples 5-6, it can be seen that, according to the present invention, the compressive strength and seawater erosion resistance of the cement-based material are better when the weight ratio between the early strength agent and the water reducing agent is 1 (0.6-0.9). This shows that, in the present invention, the early strength agent and the water reducing agent have a synergistic effect on the strength and seawater erosion resistance of the cement-based material.
In addition, in the building materials, whether concrete containing coarse aggregate or cement-based materials containing no coarse aggregate, etc., the mud content in the stone and sand used is generally not more than 3-4%. This is because, when the mud content in the stone or sand is too high, it seriously affects the interfacial crosslinking degree of the stone or sand, thereby seriously affecting the strength of the concrete or cement-based material. By adopting the scheme, the cement-based material prepared by the method still has better strength even if the mud content of the adopted sand exceeds 4 percent and is 5 to 6 percent. This shows that the cement-based material of the present invention is not sensitive to the mud content of sand, which is of great significance for practical application.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (8)
1. A sulphoaluminate cement-based material for ocean repairing protection engineering is characterized by comprising the following components in parts by weight: 100 parts of sulphoaluminate cement, 30-60 parts of fly ash, 10-40 parts of silica fume, 350 parts of modified filler, 2-5 parts of early strength agent, 1-3 parts of water reducing agent, 0.02-0.04 part of air entraining agent and 60-70 parts of water;
the preparation of the modified filler comprises the following steps:
preparing a polyvinyl alcohol aqueous solution with the mass concentration of 3-4%, and adding a defoaming agent accounting for 0.05-0.07% of the mass fraction of the polyvinyl alcohol aqueous solution in the preparation process to obtain a modified solution;
and b, soaking the filler composition into the modified liquid obtained in the step a while stirring for 1-2h, taking out and drying to obtain the modified filler, wherein the filler composition consists of sand, diatomite and silicon carbide powder which are uniformly mixed according to the weight ratio of 1 (0.05-0.3) to (0.02-0.2).
2. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: in the step b of preparing the modified filler, the filler composition consists of sand, diatomite and silicon carbide powder in a weight ratio of 1 (0.1-0.15) to (0.05-0.1).
3. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: the fineness modulus of the sand is 1.6-2.2, and the mud content is 5-6%.
4. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: the weight ratio of the sulphoaluminate cement to the fly ash to the siliceous dust is 1 (0.4-0.5) to 0.2-0.3.
5. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: the early strength agent is calcium formate, the water reducing agent is polycarboxylic acid water reducing agent, and the weight ratio of the early strength agent to the water reducing agent is 1 (0.6-0.9).
6. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: the air entraining agent is rosin air entraining agent.
7. The sulphoaluminate cement-based material for ocean repairing protection engineering, according to claim 1, is characterized in that: the defoaming agent is an organic silicon defoaming agent.
8. A method for preparing sulphoaluminate cement-based materials for ocean repairing protection engineering according to any one of claims 1 to 7, which is characterized by comprising the following steps:
a, preparing a modified filler;
and b, uniformly mixing the raw material components of the sulphoaluminate cement-based material for the ocean repairing protection project according to the parts by weight to obtain the sulphoaluminate cement-based material for the ocean repairing protection project, wherein the stirring speed is 400 plus materials and 500rpm, and the stirring time is 5-10 min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020009622A1 (en) * | 1999-08-03 | 2002-01-24 | Goodson David M. | Sprayable phosphate cementitious coatings and a method and apparatus for the production thereof |
| CN104478349A (en) * | 2014-11-08 | 2015-04-01 | 辽宁省建设科学研究院 | Early strength high wear-resisting self-leveling mortar used for ground repairing and preparation method thereof |
| CN105294049A (en) * | 2015-10-12 | 2016-02-03 | 广西交通科学研究院 | Special cement-base patching material and cement concrete pavement quick repairing method |
| CN108017345A (en) * | 2017-12-08 | 2018-05-11 | 江苏苏博特新材料股份有限公司 | A kind of ultrahigh-performance cement-based patching material and preparation method thereof |
| CN109761556A (en) * | 2019-01-25 | 2019-05-17 | 北京瑞威世纪铁道工程有限公司 | Early high-strength quick tunnel anchor shaft anchor cable construction adhesive |
-
2020
- 2020-01-10 CN CN202010027052.3A patent/CN111153661B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020009622A1 (en) * | 1999-08-03 | 2002-01-24 | Goodson David M. | Sprayable phosphate cementitious coatings and a method and apparatus for the production thereof |
| CN104478349A (en) * | 2014-11-08 | 2015-04-01 | 辽宁省建设科学研究院 | Early strength high wear-resisting self-leveling mortar used for ground repairing and preparation method thereof |
| CN105294049A (en) * | 2015-10-12 | 2016-02-03 | 广西交通科学研究院 | Special cement-base patching material and cement concrete pavement quick repairing method |
| CN108017345A (en) * | 2017-12-08 | 2018-05-11 | 江苏苏博特新材料股份有限公司 | A kind of ultrahigh-performance cement-based patching material and preparation method thereof |
| CN109761556A (en) * | 2019-01-25 | 2019-05-17 | 北京瑞威世纪铁道工程有限公司 | Early high-strength quick tunnel anchor shaft anchor cable construction adhesive |
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