CN110950554B - High-corrosion-resistance low-shrinkage portland cement for ocean engineering and preparation method thereof - Google Patents
High-corrosion-resistance low-shrinkage portland cement for ocean engineering and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—Portland cements
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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- C04B7/00—Hydraulic cements
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Abstract
The invention provides high-corrosion-resistance low-shrinkage portland cement for ocean engineering and a preparation method thereof. The cement comprises the following components in percentage by mass: 25-45% of cement clinker; 8-14% of gypsum; 40-60% of mineral powder; 3-5% of fly ash; submicron material, 1-3%; 0-3% of performance adjusting component; the preparation method of the cement comprises the following steps: the method comprises the following steps: ball-milling cement clinker and gypsum to obtain first grinding fine powder; step two: ball-milling the sulphoaluminate cement clinker to obtain second grinding fine powder; step three: the first and second fine powder are fully and uniformly mixed with the mineral powder, the fly ash and the submicron material. The cement has the advantages of low cost, simple preparation process, strong chloride ion corrosion resistance and high strength, is suitable for the requirement of marine engineering concrete engineering construction in a complex marine environment, and has wide application prospect.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to high-corrosion-resistance low-shrinkage portland cement for ocean engineering and a preparation method thereof.
Background
China is a big ocean country, the area of the ocean is about 300 ten thousand square kilometers, ocean resources are rich, and the development potential is huge. With the successive development of 'economic belt for silk road', 'economic belt for 21 st century sea silk road' and 'strong sea country' in China, the construction of sea engineering in China is coming up to a new high-speed development period. However, under extremely complex marine environments such as sea wave scouring, humidity, temperature and salt invasion, the problems of large shrinkage, easy cracking, insufficient corrosion resistance and the like of cement-based materials are still prominent, and the service life of concrete engineering is greatly influenced.
Portland cement is an important basic cementing material in concrete engineering in marine environment, and the composition and the structure of the Portland cement have important influences on the workability, the chlorine salt corrosion resistance and the like of a cement-based material. In recent years, developed countries such as france, the netherlands and japan adopt mineral materials such as high-doped slag and fly ash to develop special anti-corrosion cement-based materials for ocean engineering, china also develops a great deal of research on special cement for ocean engineering, and at present, most of the research usually adopts a composite method of cement clinker, high-doped mineral powder, fly ash, furnace bottom slag, a small amount of silica fume or modified metakaolin and the like to improve the seawater corrosion resistance of the cement; meanwhile, research reports that calcium sulphoaluminate cement is used for improving seawater corrosion resistance and wear resistance of cement. However, the introduction of a large amount of mineral composite materials in the cement-based materials can also bring negative effects of low early strength, low coagulation speed, easy segregation, large drying shrinkage, poor freezing resistance and carbonization resistance and the like to the cement-based materials. Therefore, in recent years, the research on the high-corrosion-resistance cement-based materials has been put into the national focus research and development plan, and the high-corrosion-resistance, low-shrinkage and low-heat cement-based cementing materials in the complex marine environment become the research subject which needs to be solved urgently at present.
Disclosure of Invention
The main purpose of the invention is to provide high corrosion resistance low shrinkage portland cement for ocean engineering (hereinafter referred to as "high corrosion resistance low shrinkage maritime work cement") and a preparation method thereof; the cement raw material has low cost and simple preparation process, and the cement has extremely strong chloride ion corrosion resistance and high strength, is suitable for the requirement of marine engineering concrete engineering construction in a complex marine environment, and has wide application prospect.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides high-corrosion-resistance low-shrinkage marine engineering cement which comprises the following components in percentage by mass: 25-45% of cement clinker; 8-14% of gypsum; 40-60% of mineral powder; 3-5% of fly ash; submicron materials, 1-3%; 0-3% of performance adjusting component.
The purpose of the invention and the technical problem to be solved can be further realized by adopting the following technical measures.
Preferably, the high-corrosion-resistance low-shrinkage marine cement is a general portland cement clinker meeting the technical requirements of GB/T21372; the 3d compressive strength of the cement clinker is more than or equal to 34.0MPa, and the 28d compressive strength is more than or equal to 58.0MPa.
Preferably, the high corrosion resistance and low shrinkage marine cement is natural gypsum or mixed gypsum meeting the requirements of the GB/T5483 standard, wherein the content of anhydrite is not more than 50% of the total content of gypsum in percentage by mass.
Preferably, the mineral powder is an active mineral powder of S95 grade and above, which meets the requirements of the GB/T18046 standard.
Preferably, the fly ash is grade I or II fly ash meeting the requirements of the GB/T1596 standard, and the loss on ignition is ≦ 5.0%.
Preferably, the high corrosion resistance and low shrinkage marine cement is prepared by mixing the submicron material with the submicron silicon fine powder and/or the submicron aluminum fine powder; the submicron siliceous fine powder is SiO with the particle size less than or equal to 1000nm 2 Micro-powder; the submicron aluminum fine powder is Al with the particle size less than or equal to 1000nm 2 O 3 And (5) micro-powder.
Preferably, the high corrosion resistance low shrinkage marine cement is prepared by mixing the above-mentioned performance adjusting components with anhydrous calcium sulphoaluminate early strength minerals; the anhydrous calcium sulphoaluminate early strength mineral is taken from sulphoaluminate cement clinker; the content of anhydrous calcium sulphoaluminate early strength minerals in the sulphoaluminate cement clinker is not less than 55 percent by mass percentage.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. The invention provides a preparation method of high-corrosion-resistance low-shrinkage marine cement, which comprises the following steps: the method comprises the following steps: ball milling cement clinker and gypsum to obtain first grinding fine powder; step two: ball-milling the sulphoaluminate cement clinker to obtain second grinding fine powder; step three: the first and second fine powder are fully and uniformly mixed with the mineral powder, the fly ash and the submicron material.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, in the method for preparing high corrosion resistance low shrinkage marine cement, the specific surface area of the first ground fine powder is 360m 2 /Kg≦S≦400m 2 Kg; the specific surface area S of the second grinding fine powder is more than or equal to 350m 2 Per Kg; the specific surface area S of the cement is more than or equal to 420m 2 Per Kg; the fineness of the cement is 6-10% of the screen residue with the fineness of 45um in percentage by mass.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. The high corrosion resistance low shrinkage marine engineering cement provided by the invention is applied to the cement industry and the concrete industry.
By the technical scheme, the high-corrosion-resistance low-shrinkage marine cement and the preparation method thereof provided by the invention have the following advantages:
1. the high corrosion resistance and low shrinkage marine engineering cement and the preparation method thereof can obviously improve the chloride ion corrosion resistance of cement and concrete under complex marine environment conditions. Proved by experiments, the high corrosion resistance and low shrinkage diffusion coefficient D of the chloride ions of the marine cement CL Only 0.45X 10 -12 m 2 About/s (far lower than GB/T31289-2014 maritime work portland cement D) CL Not more than 1.5X 10 -12 m 2 S), tableThe strong chlorine ion penetration resistance is shown; in addition, in 5 times of high concentration seawater, the 120d compressive strength loss rate of the high-corrosion-resistance low-shrinkage marine cement is only about 10%, and the erosion resistance coefficient K is C >1.0, very good corrosion resistance was exhibited. Furthermore, the concrete prepared by using the high corrosion resistance low shrinkage marine engineering cement provided by the invention has extremely strong chloride ion resistance, the electric flux of the concrete 28d is only about 1/5 of that of common portland cement, and particularly when the water cement ratio W/C =0.3, the electric flux is only about 320 coulombs.
2. The high corrosion resistance and low shrinkage marine cement and the preparation method thereof can obviously improve the drying shrinkage of cement-based materials and improve the early and later strength of the cement. Experiments prove that the 28d dry shrinkage rate of the high-corrosion-resistance low-shrinkage marine cement is low (less than or equal to 0.05%); the dry shrinkage rate is far lower than that of the maritime work cement POP32.5 (0.072%); furthermore, the dry shrinkage of the concrete prepared by the high-corrosion-resistance low-shrinkage marine engineering cement provided by the invention at all ages is lower than that of PO42.5 cement concrete; in particular, the 28d dry shrinkage is only 0.029%, which is far lower than that of ordinary portland cement PO42.5 (28 d dry shrinkage is 0.034%).
3. The high-corrosion-resistance low-shrinkage marine cement and the preparation method thereof have the advantages of low cost and simple preparation process. On one hand, in the aspect of raw material selection, a large amount of industrial waste residues such as mineral (slag) powder and the like are utilized, and the fly ash is waste discharged from a fly ash coal-fired power plant, so that the cost is low, the environmental protection problem can be solved, meanwhile, a submicron material is added into the raw material, although the submicron material is very low in cost compared with a nanometer material, the submicron material belongs to a material with relatively high price in the high-corrosion-resistance low-shrinkage marine cement, the economic cost and the performance balance of the cement are comprehensively considered, and the use proportion of the submicron material is relatively small; on the other hand, the preparation method of the high-corrosion-resistance low-shrinkage marine cement is simple. The clinker and the gypsum are only required to be ball-milled to a certain fineness and then mixed with other materials for ball milling to realize the excellent comprehensive performance, so that the cement has very good beneficial effects, and the performance of the cement is not required to be adjusted by adding a plurality of additives such as preservatives, air-entraining agents and the like in other cement preparation.
4. The raw materials used by the high corrosion resistance low shrinkage marine cement provided by the invention are convenient to purchase and obtain, and the use of materials such as mineral (slag) powder, fly ash and the like is also beneficial to reducing the production cost of the cement and the emission of pollutants.
In conclusion, the high corrosion resistance and low shrinkage marine engineering cement and the preparation method thereof provided by the invention have the advantages of low cost, simple preparation process and reliable performance, are suitable for the requirements of marine engineering concrete engineering construction in complex marine environments, and have wide application prospects.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the preferred embodiments, structures, features and effects thereof according to the present invention will be given.
The invention provides high-corrosion-resistance low-shrinkage marine cement which comprises the following components in percentage by mass: 25-45% of cement clinker; 8-14% of gypsum; 40-60% of mineral powder; 3-5% of fly ash; submicron materials, 1-3%; 0-3% of performance adjusting component.
Preferably, the high-corrosion-resistance low-shrinkage marine cement is a general portland cement clinker meeting the technical requirements of GB/T21372; the 3d compressive strength of the cement clinker is more than or equal to 34.0MPa, and the 28d compressive strength is more than or equal to 58.0MPa.
Preferably, the high corrosion resistance and low shrinkage marine cement is natural gypsum or mixed gypsum meeting the requirements of the GB/T5483 standard, wherein the content of anhydrite is not more than 50% of the total content of gypsum in percentage by mass.
Preferably, the mineral powder is an active mineral powder of S95 grade and above, which meets the requirements of the GB/T18046 standard.
Preferably, the fly ash is grade I or II fly ash meeting the requirements of the GB/T1596 standard, and the loss on ignition is ≦ 5.0%.
The waste discharged by the coal ash coal-fired power plant.
Preferably, the high corrosion resistance and low shrinkage marine cement is prepared by mixing the submicron material with the submicron silicon fine powder and/or the submicron aluminum fine powder; the submicron siliceous fine powder is SiO with the particle size less than or equal to 1000nm 2 Micro-powder; the submicron aluminum fine powder is Al with the particle size less than or equal to 1000nm 2 O 3 And (5) micro-pulverizing.
The submicron materials are commercially available.
Due to the fact that the price of the submicron material is high, economic cost and performance balance of cement are comprehensively considered, and the using proportion of the submicron material is relatively small.
Preferably, the high corrosion resistance low shrinkage marine cement is prepared by mixing the above-mentioned performance adjusting components with anhydrous calcium sulphoaluminate early strength minerals; the anhydrous calcium sulphoaluminate early strength mineral is taken from sulphoaluminate cement clinker; the content of anhydrous calcium sulphoaluminate early strength minerals in the sulphoaluminate cement clinker is not less than 55 percent by mass percentage.
The performance adjusting component is helpful for adjusting the setting and hardening rate, the volume deformation and the like of the cement.
The raw materials are convenient to purchase and obtain, and the use of the materials such as the ore (slag) powder, the fly ash and the like is also beneficial to reducing the production cost of cement and the emission of pollutants.
Seawater erosion is mainly chlorine salt erosion, and chemical erosion such as magnesium salt erosion is the second. In the technical scheme, a certain amount of cement clinker, mineral powder, fly ash, submicron material and performance adjusting components are used. Wherein, the use of the mineral powder and the fly ash reduces Ca (OH) in slurry through the volcanic ash reaction between the mineral powder and cement hydration products 2 In an amount to reduce Ca (OH) in the transition region of the interface 2 The crystal is enriched and directionally arranged, which is helpful for improving the slurry interface transition area and the cement-stone pore junctionThe penetration rate of chloride ions and the corrosion influence of magnesium salts are reduced, and C-S-H (II) gel with low alkalinity is formed to enhance the mechanical property of cement and the binding capacity to free chloride ions; the introduction of a large amount of mineral powder and fly ash improves the chemical erosion resistance of cement. The improvement of the mixing amount of the gypsum not only has a sulfate excitation effect on the activity of mineral materials, but also can play a certain role in inhibiting the volume shrinkage of the set cement through the micro-swelling effect of hydration reaction. Submicron Al 2 O 3 The doping of the cement powder and the like not only can make up for the particle distribution and hydration activity of materials such as mineral powder and the like, but also can promote the hydration of cement and refine the microstructure of the set cement through the size effect, the interface effect and the volcanic ash effect of the cement; at the same time, submicron Al 2 O 3 The doping makes up for the shortage of aluminum phase hydration products in the hydration bodies, improves the binding capacity of the hydration products to chloride ions, and has great effect on improving the strength, the corrosion resistance and the like of cement. The addition of the anhydrous calcium sulphoaluminate minerals is beneficial to improving the early strength of the set cement and obviously shortening the setting and hardening time of the cement so as to solve the problems of setting time, low early strength and the like of a large-dosage mixed material; at the same time, its incorporation helps to suppress the problem of drying shrinkage of the cement stones.
The materials are compounded, and through the effect of mutual efficiency superposition, the composition of cement hydration products is optimized, the cement stone pore structure is refined, the mechanical property and the free chloride ion binding capacity of cement are enhanced, the cement hydration process development is promoted, the cement setting speed is shortened, and a certain inhibiting effect on cement stone dry shrinkage is achieved, so that the corrosion resistance of the cement-based material in a complex marine environment is obviously improved. This has been confirmed in research trials.
The invention also provides a preparation method of the high-corrosion-resistance low-shrinkage marine cement, which comprises the following steps: the method comprises the following steps: ball-milling cement clinker and gypsum to obtain first grinding fine powder; step two: ball-milling the sulphoaluminate cement clinker to obtain second grinding fine powder; step three: the first and second fine powder are fully and uniformly mixed with the mineral powder, the fly ash and the submicron material.
The product obtained by ball milling has better particle morphology.
Because the particles of the cement clinker are difficult to grind, the cement clinker needs to be firstly ground into fine powder, and then the obtained first ground fine powder is mixed with other fine powder.
Preferably, in the method for preparing high corrosion resistance low shrinkage marine cement, the specific surface area of the first ground fine powder is 360m 2 /Kg≦S≦400m 2 Kg; the specific surface area S of the second ground fine powder is more than or equal to 350m 2 Per Kg; the specific surface area S of the cement is more than or equal to 420m 2 Kg; the fineness of the cement is 6-10% of the screen residue with the fineness of 45um in percentage by mass.
The fineness of the product obtained by ball milling cannot be too coarse, and the fineness of the fine powder is coarse, so that the improvement of the mechanical property of the cement is not facilitated, and the diffusion coefficient of cement chloride ions is increased; however, the fineness cannot be too fine, and if the fineness of the cement is too fine, the use properties of the cement are affected, such as large water demand and large drying shrinkage.
The present invention will be described in detail with reference to examples. The following examples are given to illustrate the detailed embodiments and specific procedures, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
Example 1
1. Preparation of high corrosion-resistant low-shrinkage marine cement
The raw materials are weighed according to the following mass percentage content and components, and the raw materials comprise the following components in parts by mass:
33 parts of cement clinker, 10 parts of gypsum, 50 parts of S95-grade mineral powder, 5 parts of II-grade fly ash and submicron (500 nm) Al 2 O 3 1 part of micro powder and 1 part of performance adjusting component.
Firstly, grinding cement clinker and gypsum to a certain fineness by using a ball mill (specific area S =380 m) 2 Kg), then mixing the mixture with S95-grade mineral powder, II-grade fly ash and submicron Al 2 O 3 Micropowder and sulphoaluminate cement clinker powder (specific surface area S =350 m) 2 Kg) and controlling the cementThe sample fineness is 45um and the screen residue is 8 percent.
2. Performance detection of high corrosion resistance and low shrinkage marine cement
The physical properties and corrosion resistance of the cement samples prepared by the method are detected by methods such as GB/T17671 cement mortar strength test method (ISO method), GB/T1346 cement standard consistency water consumption, setting time and stability test method, JC/T1086 and the like, and the test data are shown in tables 1-3.
3. Performance detection of concrete prepared from high-corrosion-resistance low-shrinkage marine cement
The concrete samples are prepared from the cement samples obtained by the method, and the drying shrinkage performance and the corrosion resistance are detected according to methods such as GB/T50082-2009 Standard test method for the long-term performance and the durability of ordinary concrete, and the test data are shown in tables 4-5.
TABLE 1 comparison of physical Properties of high corrosion resistance, low shrinkage marine cement of example 1 with general Portland cement
TABLE 2 comparison of the corrosion resistance of the high corrosion resistance low shrinkage marine cement of example 1 with that of different types of cement
The test results in the above tables 1-2 show that the high corrosion resistance and low shrinkage marine cement has physical properties similar to that of the general cement P.O42.5, the 28d compressive strength of 52.6MPa, the initial setting time of the cement of about 3 hours and 40 minutes, the 3d compressive strength of 22.5MPa and the standard consistency of cement paste of 26.0 percent, and is superior to that of the marine portland cement POP32.5 cement.
In addition, the high corrosion resistance and low shrinkage of the chloride ion diffusion coefficient D of the marine cement CL Is only 0.45X 10 -12 m 2 S, which is significantly lower than that of POP32.5 cement (0.78 multiplied by 10) of marine cement -12 m 2 S) and general portland cement (P.II52.5, P.O42.5, P.S32.5,P.c 32.5) and in Na 2 SO 4 、MgCl 2 And the corrosion resistance coefficient of seawater with 3 times concentration is more than 1.00, which is far higher than that of sulfur-resistant cement, moderate-heat cement and general portland cement P.O42.5, and the cement has extremely strong chloride ion penetration resistance and chemical erosion resistance.
TABLE 3 comparison of the dry shrinkage of the high corrosion resistance low shrinkage marine cement of example 1 with different types of cement
The above table 3 shows the dry shrinkage ratio of the marine cement with high corrosion resistance and low shrinkage compared with other types of cement in different ages. The test results in table 3 show that the dry shrinkage of the marine cement with high corrosion resistance and low shrinkage is less than that of PSA32.5 and POP32.5 cement of marine portland cement in both early and later stages, and the dry shrinkage of the cement in 28 days is only 0.049%, which is similar to that of PII52.5 of pure portland cement without mineral admixture and shows good dry shrinkage performance.
TABLE 4 comparison of the resistance to chloride ion penetration of concretes prepared from different cement varieties
TABLE 5 comparison of the shrinkage ratios of concretes prepared from different cement types
The test results in the above tables 4 to 5 show that the electric flux of the concrete prepared from the high corrosion-resistant low-shrinkage marine cement is about 1/5 of that of ordinary cement concrete no matter the water cement ratio W/C is high or low, and the electric flux of 28d can still reach about 550 coulombs when the water cement ratio is high (W/C = 0.50), which is far lower than the technical requirements (less than 1000 coulombs) related to the technical Specification for corrosion prevention of the concrete structure in harbor engineering (JTJ 275) and the standard for quality control of high-performance concrete in ocean engineering (JTJ 257-2-2012), and shows extremely strong chloride ion penetration resistance. Meanwhile, the dry shrinkage of the prepared concrete at each age is slightly lower than that of ordinary cement concrete without a large amount of mineral admixture, and the prepared concrete shows good stability.
Examples 2 to 5
The raw materials of the high corrosion resistance low shrinkage marine cement were weighed according to the formulation of table 6, and then cement samples were prepared and tested for properties according to the method of example 1, and the properties are also shown in table 6.
TABLE 6 influence of proportioning change of high corrosion resistance and low shrinkage marine cement on physical properties of cement
As can be seen from the test data in Table 6, when the raw material ratio of the high corrosion resistance low shrinkage marine cement is changed, the physical properties of the cement are still improved to different degrees, and the diffusion coefficients of chloride ions are basically less than 0.5 multiplied by 10 -12 m 2 The corrosion resistance coefficient of seawater with 3 times concentration is more than 1.00, the 28d dry shrinkage is basically less than 0.05 percent, the 28-day strength is more than 52.0MPa, and the seawater corrosion resistant agent has extremely strong chlorine salt corrosion resistance and good physical performance. From this, it can also be seen that the stability of the properties of the high corrosion resistance low shrinkage marine cement of the present invention.
The recitation of numerical ranges herein includes all numbers subsumed within that range and includes any two numbers subsumed within that range. Different values of the same index appearing in all embodiments of the invention can be combined arbitrarily to form a range value.
The features of the invention claimed and/or described in the specification may be combined, and are not limited to the combinations set forth in the claims by the recitations therein. The technical solutions obtained by combining the technical features in the claims and/or the specification also belong to the scope of the present invention.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The high-corrosion-resistance low-shrinkage portland cement for ocean engineering is characterized by comprising the following components in percentage by mass:
25-45% of cement clinker;
8-14% of gypsum;
40-60% of mineral powder;
3-5% of fly ash;
1-3% of submicron material;
0-3% of performance adjusting component;
the submicron material is submicron silicon fine powder and submicron aluminum fine powder;
the submicron silicon fine powder is SiO with the particle size of 500-1000nm 2 Micro-powder;
the submicron aluminum fine powder is Al with the particle size of 500-1000nm 2 O 3 And (5) micro-pulverizing.
2. The high corrosion resistance low shrinkage portland cement for marine engineering according to claim 1,
the cement clinker is general portland cement clinker which meets the technical requirements of GB/T21372; the 3d compressive strength of the cement clinker is more than or equal to 34.0MPa, and the 28d compressive strength is more than or equal to 58.0MPa.
3. The high corrosion resistance low shrinkage portland cement for ocean engineering according to claim 1,
the gypsum is natural gypsum or mixed gypsum meeting the GB/T5483 standard requirements, wherein the content of the anhydrite is not more than 50 percent of the total amount of the gypsum by mass percentage.
4. The high corrosion resistance low shrinkage portland cement for ocean engineering according to claim 1,
the mineral powder is S95 grade or above active mineral powder which meets the GB/T18046 standard requirements.
5. The high corrosion resistance low shrinkage portland cement for ocean engineering according to claim 1,
the fly ash is I-grade or II-grade fly ash meeting the GB/T1596 standard requirement, and the ignition loss is less than or equal to 5.0 percent.
6. The high corrosion resistance low shrinkage portland cement for ocean engineering according to any one of claims 1-5,
the performance adjusting component is an anhydrous calcium sulphoaluminate early strength mineral;
the anhydrous calcium sulphoaluminate early strength mineral is taken from sulphoaluminate cement clinker;
the content of anhydrous calcium sulphoaluminate early strength minerals in the sulphoaluminate cement clinker is not less than 55 percent by mass percentage.
7. A method for preparing the high corrosion resistance low shrinkage portland cement for ocean engineering according to claim 6,
the method comprises the following steps: ball milling cement clinker and gypsum to obtain first grinding fine powder;
step two: ball-milling the sulphoaluminate cement clinker to obtain second grinding fine powder;
step three: the first and second ground fine powder are fully and uniformly mixed with mineral powder, fly ash and submicron materials;
the specific surface area of the first ground fine powder is 360m 2 /Kg≦S≦400m 2 /Kg；
The specific surface area S of the second grinding fine powder is more than or equal to 350m 2 /Kg；
The specific surface area S of the cement is more than or equal to 420m 2 /Kg；
The fineness of the cement is 6-10% of the screen residue with the fineness of 45um in percentage by mass.
8. The use of the high corrosion resistance low shrinkage portland cement for marine engineering as claimed in any one of claims 1 to 6 in cement industry and concrete industry.
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| CN113264697A (en) * | 2021-05-10 | 2021-08-17 | 海南津桓建材科技有限公司 | Marine engineering portland cement and preparation method thereof |
| CN115417609B (en) * | 2022-08-31 | 2023-05-12 | 中国建筑材料科学研究总院有限公司 | Preparation method of early-strength low-shrinkage low-heat silicate cement |
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