A geopolymer-based marine cement material, preparation method and application method

Abstract

The present invention provides a geopolymer-based marine cement material, preparation method, and application method. The first component comprises, by weight, 50-77 parts of a composite alkali activator; the second component comprises 100 parts of metakaolin, 0.3-0.8 parts of a fiber material, 3-5 parts of a water reducer, 1-2 parts of a suspending agent, 1-2 parts of a coupling agent, 0.5-0.8 parts of a defoamer, and 10-30 parts of water; and the third component comprises 120-150 parts of granulated blast-furnace slag powder. The mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and granulated blast-furnace slag powder is 0.2-0.35. Based on the geopolymer composed of the first and second components, the present invention utilizes granulated blast-furnace slag powder to improve the compressive strength and deep-sea stability of the composite cement material, and uses fiber material to increase the toughness and tensile strength of the cement material to adapt to high-water-pressure deep-sea applications.

Description

Technical Field

[0001] The present invention belongs to the field of deep sea engineering technology, and in particular relates to a geopolymer-based marine cement material, a preparation method and an application method. Background Art

[0002] Currently, marine cement plays a vital role in deepwater engineering. Deepwater engineering includes subsea oil and gas extraction, deepwater jacket installation, subsea production equipment installation, and subsea pipeline laying, often requiring operation in extreme underwater environments. In such environments, marine cement is widely used in the following key areas:

[0003] 1. Support and Fixing: Marine cement materials are used to support and fix submarine equipment, duct clamps, pipelines, etc., ensuring their stability and safety. These materials are often used to fill the support piles of submarine facilities and fix submarine pipelines and equipment, withstanding the challenges brought by deep-sea water pressure and submarine topography.

[0004] 2. Filling and Sealing: In submarine engineering, marine cement is used to fill pipelines, plug wells, and other locations that require sealing. It can fill gaps around pipelines, protect them from external environmental erosion, and ensure their stability and sealing.

[0005] 3. Isolation and Protection: Marine cement is also used in submarine projects to isolate different strata or protect equipment and pipelines from the seabed environment. For example, in downhole operations, marine cement is used to isolate different strata, preventing fluid leakage and mutual influence between strata.

[0006] However, traditional marine cement materials present a number of challenges in deep-sea engineering. First, traditional marine cement takes a long time to cure, which in deep-sea projects can extend construction timelines, increase costs, and impact project progress. Second, its low compressive strength makes it difficult to meet the support material requirements of the deep-sea environment, potentially leading to unstable supports. Furthermore, traditional marine cement materials are insufficiently stable in the high-pressure environment of the deep sea, being susceptible to water pressure and chemical environments, making it difficult to maintain good performance over the long term. These issues limit the application of traditional marine cement materials in deep-sea engineering, impacting construction efficiency and quality. Therefore, there is an urgent need for a new marine cement material that can overcome these issues and meet the material performance and stability requirements of deep-sea projects. Summary of the Invention

[0007] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a marine cement material based on geopolymer, a preparation method and an application method, which are mainly used to solve the problems of traditional marine cement materials in the existing technology such as long curing time, low compressive strength and poor stability.

[0008] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0009] In a first aspect, the present invention provides a geopolymer-based marine cement material, wherein the marine cement material comprises a first component, a second component, and a third component, which are as follows in parts by mass:

[0010] The first component includes: 50 to 77 parts of a composite base activator;

[0011] The second component includes: 100 parts of metakaolin, 0.3-0.8 parts of fiber material, 3-5 parts of water reducer, 1-2 parts of suspending agent, 1-2 parts of coupling agent, 0.5-0.8 parts of defoaming agent, and 10-30 parts of water;

[0012] The third component includes: 120-150 parts of granulated blast furnace slag powder;

[0013] The mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.2 to 0.35.

[0014] In some embodiments, the composite alkali activator is prepared from NaOH solution and water glass in a volume ratio of 1.5 to 2.5:1, wherein the concentration of the NaOH solution is 3 to 8 mol / L, and the modulus of the composite alkali activator is 2.5 to 3M.

[0015] In some embodiments, the fiber material is one or more of lignin fiber and polyester fiber, and has a length of not less than 6 mm and not more than 18 mm.

[0016] In some embodiments, only quartz diffraction peaks from metakaolin exist in the XRD pattern of the marine cement material.

[0017] In some embodiments, in the FT-IR spectrum of the marine cement material, the stretching vibration peak of TO-Si shifts to a lower wavenumber by no more than 20 wavenumbers, wherein T is Si or Al.

[0018] In some embodiments, there is at least one hydroxyl absorption peak in the FT-IR spectrum of the marine cement material.

[0019] In some embodiments, in the marine cement material, the amount of mono-silicon aluminum PS type oligomers is greater than the sum of the amounts of disilicate aluminum PSS type oligomers and tri-silicon aluminum PSDS type oligomers.

[0020] In some embodiments, the granulated blast furnace slag powder includes aluminum oxide, silicon dioxide, and iron oxide.

[0021] In a second aspect, the present invention provides a method for preparing the above-mentioned geopolymer-based marine cement material, comprising the following steps:

[0022] (1) Prepare the first component, the second component and the third component according to the following mass parts:

[0023] The first component includes: 50 to 77 parts of a composite base activator;

[0024] The second component includes: 100 parts of metakaolin, 0.3-0.8 parts of fiber material, 3-5 parts of water reducer, 1-2 parts of suspending agent, 1-2 parts of coupling agent, 0.5-0.8 parts of defoaming agent, and 10-30 parts of water;

[0025] The third component includes: 120-150 parts of granulated blast furnace slag powder;

[0026] wherein the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.2 to 0.35;

[0027] (2) Mixing

[0028] Grinding and mixing the second component and the third component to obtain a mixture;

[0029] (3) Alkali excitation

[0030] Gradually add the first component to the mixture, stirring constantly to mix evenly;

[0031] (4) Curing

[0032] The material is left to stand and solidify at a preset temperature to obtain marine cement material.

[0033] In a third aspect, the present invention provides a method for applying the geopolymer-based marine cement material as described above, comprising the following steps:

[0034] Fill the prepared marine cement material into the support piles of the deep-sea jacket and use a heating rod to stir it evenly during the filling process;

[0035] After the curing time, remove the protective plates supporting the toe piles.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] Based on the geopolymer composed of the first and second components, granulated blast furnace slag powder is used to improve the compressive strength and deep-sea stability of the composite cement material, and fiber materials are used to increase the toughness and tensile strength of the cement material to adapt to the application scenario of deep-sea high water pressure;

[0038] XRD pattern detection ensures that the main component of marine cement materials is metakaolin, ensuring the crystallinity and stability of the materials. FT-IR pattern analysis is also used to ensure the stability and consistency of the silicon-aluminum skeleton in marine cement materials, as well as good bonding and curing properties.

[0039] By controlling the content of mono-silicon aluminum PS type oligomers to be higher, it helps to improve the hardening speed and mechanical properties of marine cement materials.

[0040] The present invention will be further described in detail below with reference to specific embodiments. DETAILED DESCRIPTION

[0041] In a first aspect, the present invention provides a geopolymer-based marine cement material, wherein the marine cement material comprises a first component, a second component, and a third component, which are as follows in parts by mass:

[0042] The first component includes: 50 to 77 parts of a composite base activator;

[0043] The second component includes: 100 parts of metakaolin, 0.3-0.8 parts of fiber material, 3-5 parts of water reducer, 1-2 parts of suspending agent, 1-2 parts of coupling agent, 0.5-0.8 parts of defoaming agent, and 10-30 parts of water;

[0044] The third component includes: 120-150 parts of granulated blast furnace slag powder;

[0045] Among them, the mass ratio of the composite alkali activator to the sum of the masses of the metakaolin and the granulated blast furnace slag powder is 0.2 to 0.35. By controlling the mass ratio of the composite alkali activator, the composite alkali activator is used to stimulate the metakaolin and granulated blast furnace slag powder to perform composite gelation, forming an alkali-slag-metakaolin composite gelling material, which exhibits excellent compressive strength and stability and is very suitable for deep-sea environments, especially for use under high pressure on the seabed.

[0046] It should be noted that geopolymer cement is a type of clinker-free cement. Clinker-free cement primarily consists of a base component and an activator. There are two types of base components: one is pozzolanic material, derived from volcanic ash, calcined kaolin, and fly ash, whose active ingredients are metakaolin and silica-alumina glass; the other is slag material, derived from granulated blast furnace slag, granulated steel slag, and phosphorus slag, whose active ingredient is calcium silicate-alumina glass. There are also two types of activators for clinker-free cement: one is a Ca(OH)2-type activator, such as lime and cement clinker; the other is a NaOH-type activator, such as NaOH and water glass. Different configurations of base components and activators can produce various clinker-free cement varieties.

[0047] Alkali-slag cement is primarily composed of granulated blast furnace slag and a NaOH-type activator, while geopolymeric cement is primarily composed of pozzolanic materials and a NaOH-type activator. It can be seen that geopolymeric cement and alkali-slag cement have different base components, but the activators are of the same type. This embodiment utilizes these two cements to form an alkali-slag-metakaolin composite cementitious material through a composite gelling process, achieving complementary advantages and improving the overall performance of the alkali-activated material.

[0048] In this process, the control requirements for the mass ratio of the composite alkali activator, metakaolin, and granulated blast furnace slag powder are very high. The mass content and concentration of the composite alkali activator will affect the compressive strength of the final marine cement material. Therefore, the mass ratio of the composite alkali activator to the sum of the masses of the metakaolin and the granulated blast furnace slag powder is in the optimal range of 0.2 to 0.35, preferably 0.3.

[0049] As an embodiment, the composite alkali activator is prepared from NaOH solution and water glass in a volume ratio of 1.5 to 2.5:1, wherein the concentration of the NaOH solution is 3 to 8 mol / L, and the modulus of the composite alkali activator is 2.5 to 3M.

[0050] As an embodiment, the fiber material is one or more of lignin fiber and polyester fiber, with a length of not less than 6 mm and not more than 18 mm. It should be noted that the length of the lignin fiber and polyester fiber does not need to be cut too short. The shortened fibers are not as helpful for the compressive strength of the composite cementitious material as slightly longer fibers. Retaining a certain length can play a better performance contribution role in the alkali-slag-metakaolin composite cementitious material, and can improve the toughness, strength and impact resistance of the cement material.

[0051] Lignin fiber is an organic fiber derived from natural wood through chemical treatment. It has a cotton-like appearance and is white or off-white. Its fiber microstructure is curved, uneven, porous, and flat at the intersections. It exhibits excellent toughness, dispersibility, and chemical stability, as well as strong water absorption and excellent thickening and crack resistance.

[0052] Polyester generally refers to a polymer derived from the polycondensation of dibasic acids and diols, with the basic chain segments connected by ester bonds. Polyester fibers possess a range of excellent properties, including high breaking strength and elastic modulus, moderate resilience, excellent heat setting, and good heat and light resistance. Polyester fibers contribute to the rapid setting properties of cementitious materials.

[0053] Furthermore, the XRD pattern of the marine cement material only contains quartz diffraction peaks derived from metakaolin. This XRD pattern only contains quartz diffraction peaks derived from metakaolin, indicating that the marine cement is primarily composed of metakaolin, ensuring the material's crystallinity and stability.

[0054] Furthermore, in the FT-IR spectrum of the marine cement material, the stretching vibration peak of TO-Si shifts to lower wavenumbers by no more than 20 wavenumbers, where T is Si or Al. In this embodiment, by detecting the FT-IR spectra of the marine cement material produced with and without fiber material, the FT-IR spectrum of the marine cement material produced without fiber material mainly shows the stretching and bending vibration peaks of HOH of liquid water and the symmetric and asymmetric stretching vibration peaks of TO-Si (T is Si and Al), without any characteristic peaks of other chemical bonds, indicating that the marine cement material is a substance composed of Si, O, and Al. After the addition of fiber material, the stretching vibration peak of TO-Si in the FT-IR spectrum of the marine cement material shifts to lower wavenumbers because the addition of fiber causes the depolymerization of Si-O-Si in the marine cement material, and some SiO4 tetrahedra are replaced by AlO4 tetrahedra, but does not cause the structure of the marine cement material to change. Furthermore, the addition of fibers reduces the free water content in marine cement materials and strengthens the tightness of the marine cement network structure. Therefore, to ensure the stability and consistency of the silicon-aluminum skeleton in marine cement materials, a quantitative indicator is used to determine whether the TO-Si stretching vibration peak shifts to a lower wavenumber by no more than 20 wavenumbers.

[0055] Furthermore, in the FT-IR spectrum of the marine cement material, there is at least one hydroxyl absorption peak. The spectrum feature of the hydroxyl absorption peak is used to characterize that the addition of fibers reduces the content of free water in the marine cement material and strengthens the tightness of the network structure of the marine cement material.

[0056] As an embodiment, in the marine cement material, the number of monosilica-aluminosilicate (PS) oligomers is greater than the sum of the number of disilica-aluminosilicate (PSS) oligomers and trisilica-aluminosilicate (PSDS) oligomers. Since the polymerization process of aluminosilicates is a gradual condensation process through hypothetical groups, these hypothetical constituent units further condense to form three-dimensional macromolecular structures. These low molecular weight units (monomers, dimers, trimers, etc.) are referred to as oligomers. Oligomeric aluminosilicates refer to monomeric orthosilica and dimerized disilicates; similarly, there are also oligomeric aluminosilicate-silicones and oligomeric aluminosilicate-disiloxanes. Therefore, in this embodiment, the monosilicon aluminum PS type oligomer is a monosilicon aluminum type -Si-O-Al-, the disilicon aluminum PSS type oligomer is a disilicon aluminum type -Si-O-Al-O-Si-, and the trisilicon aluminum PSDS type oligomer is a trisilicon aluminum type -Si-O-Al-O-Si-O-Si-. Since the monosilicon aluminum PS type oligomer has the best resistance to seawater erosion and damage and is most suitable for long-term use in the deep sea, while the disilicon aluminum PSS type oligomer and the trisilicon aluminum PSDS type oligomer are more likely to induce erosion and damage, it is necessary to limit the number of monosilicon aluminum PS type oligomers, which needs to be greater than the sum of the numbers of the disilicon aluminum PSS type oligomers and the trisilicon aluminum PSDS type oligomers, preferably 1 to 2 times.

[0057] In one embodiment, the granulated blast furnace slag powder includes aluminum oxide, silicon dioxide, and iron oxide. By excluding manganese oxide from the granulated blast furnace slag powder, the compressive strength of the marine cement material is improved under seawater erosion conditions.

[0058] In a second aspect, the present invention provides a method for preparing the above-mentioned geopolymer-based marine cement material, comprising the following steps:

[0059] (1) Prepare the first component, the second component and the third component according to the following mass parts:

[0060] The first component includes: 50 to 77 parts of a composite base activator;

[0061] The second component includes: 100 parts of metakaolin, 0.3-0.8 parts of fiber material, 3-5 parts of water reducer, 1-2 parts of suspending agent, 1-2 parts of coupling agent, 0.5-0.8 parts of defoaming agent, and 10-30 parts of water;

[0062] The third component includes: 120-150 parts of granulated blast furnace slag powder;

[0063] wherein the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.2 to 0.35;

[0064] (2) Mixing

[0065] Grinding and mixing the second component and the third component to obtain a mixture;

[0066] (3) Alkali excitation

[0067] Gradually add the first component to the mixture, stirring constantly to mix evenly;

[0068] (4) Curing

[0069] The material is left to stand and solidify at a preset temperature to obtain marine cement material.

[0070] In order to further illustrate the present invention, the geopolymer-based marine cement material and the preparation method thereof are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0071] Example 1:

[0072] (1) Prepare the first component, the second component and the third component according to the following mass parts:

[0073] The first component includes: 75 parts of composite base activator;

[0074] The second component includes: 100 parts of metakaolin, 0.5 parts of lignin fiber material, 4 parts of water reducer, 1.5 parts of suspending agent, 1.5 parts of coupling agent, 0.7 parts of defoaming agent, and 20 parts of water;

[0075] The third component includes: 150 parts of granulated blast furnace slag powder; the granulated blast furnace slag powder includes aluminum oxide, silicon dioxide, and iron oxide;

[0076] The fiber length is 12 mm, the composite alkali activator is prepared from a NaOH solution and water glass in a volume ratio of 2:1, wherein the concentration of the NaOH solution is 5 mol / L, the modulus of the composite alkali activator is 2.5 M, and the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.3;

[0077] (2) Mixing

[0078] Grinding and mixing the second component and the third component to obtain a mixture;

[0079] (3) Alkali excitation

[0080] Gradually add the first component to the mixture, stirring constantly to mix evenly;

[0081] (4) Curing

[0082] The material was allowed to stand and solidify at a temperature of 40° C. and a humidity of RH=80% for 1 day to obtain a marine cement material.

[0083] Example 2:

[0084] The difference between Example 2 and Example 1 is that the amount of the composite alkali activator is 50 parts, and the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.2.

[0085] Example 3:

[0086] The difference between Example 3 and Example 1 is that the composite alkali activator is 77 parts, the granulated blast furnace slag powder is 120 parts, and the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.35.

[0087] Example 4:

[0088] The difference between Example 4 and Example 1 is that the composite alkali activator is prepared from NaOH solution and water glass in a volume ratio of 1.5:1.

[0089] Example 5:

[0090] The difference between Example 5 and Example 1 is that the composite alkali activator is prepared from NaOH solution and water glass in a volume ratio of 2.5:1.

[0091] Example 6:

[0092] The difference between Example 6 and Example 1 is that the concentration of the NaOH solution is 3 mol / L.

[0093] Example 7:

[0094] The difference between Example 7 and Example 1 is that the concentration of the NaOH solution is 8 mol / L.

[0095] Example 8:

[0096] The difference between Example 8 and Example 1 is that the modulus of the composite base activator is 3M.

[0097] Example 9:

[0098] The difference between Example 9 and Example 1 is that the amount of lignin fiber material is 0.3 parts.

[0099] Example 10:

[0100] The difference between Example 10 and Example 1 is that the amount of lignin fiber material is 0.8 parts.

[0101] Example 11:

[0102] The difference between Example 11 and Example 1 is that the polyester fiber material is 0.5 parts.

[0103] Example 12:

[0104] The difference between Example 12 and Example 1 is that 0.5 parts of fiber material consisting of a mixture of lignin fiber material and polyester fiber material in a weight ratio of 1:1 is used.

[0105] Example 13:

[0106] The difference between Example 13 and Example 1 is that the fiber length is 6 mm.

[0107] Example 14:

[0108] The difference between Example 14 and Example 1 is that the fiber length is 18 mm.

[0109] Comparative Example 1:

[0110] Comparative Example 1 differs from Example 1 in that no fiber material is included.

[0111] Comparative Example 2:

[0112] The difference between Comparative Example 2 and Example 1 is that the granulated blast furnace slag powder further contains manganese oxide.

[0113] Performance tests and related parameter measurements were conducted on the marine cement materials prepared in Examples 1-14 and Comparative Examples 1-2. The results are shown in Tables 1 and 2. For the seawater erosion test, the marine cement materials prepared according to the Examples or Comparative Examples were molded into six cube-sized molds. The molds were placed in a simulated seawater solution and a standard curing chamber at a ratio of 1:1 for curing at 20°C. The molds were removed at the specified age, wiped clean of the erosion solution, weighed, and their strength measured. Furthermore, the seawater solution was subjected to a water pressure of 25 atmospheres to simulate the high pressure environment of the deep sea. The simulated seawater composition was custom-made, with a concentration five times that of real seawater: 27.2 g / kg NaCl, 3.8 g / kg MgCl2, 1.7 g / kg MgSO4, 1.2 g / kg CaSO4, and 0.9 g / kg K2SO4.

[0114] Table 1

[0115]

[0116] Table 2

[0117]

[0118]

[0119] As can be seen, since the weight of the marine cement molds remains essentially unchanged in the curing chamber, only the compressive strength values ​​after 30 days are listed. By comparison, under a high water pressure environment simulating deep-sea pressure of 25 atmospheres, the marine cement molds subjected to seawater erosion lose weight but increase in compressive strength. Examples 1, 11, and 12 demonstrate superior performance. Comparative Examples 1 and 2 demonstrate that both erosion resistance and compressive strength decrease in the comparative examples containing no fiber or manganese oxide.

[0120] Furthermore, through testing of the above-described embodiments, the number of monosilicon-aluminum PS-type oligomers was greater than the sum of the number of disilicon-aluminum PSS-type oligomers and trisilicon-aluminum PSDS-type oligomers. Monosilicon-aluminum PS-type oligomers are less susceptible to damage under seawater erosion conditions. However, under the influence of seawater erosion ions, some monosilicon-aluminum PS-type oligomers either change their top cation structure to form disilicon-aluminum PSS-type oligomers or change their oligomeric structure to form trisilicon-aluminum PSDS-type oligomers. Therefore, to improve stability, it is preferred that the number of monosilicon-aluminum PS-type oligomers be controlled to be 1.2 times the sum of the number of disilicon-aluminum PSS-type oligomers and trisilicon-aluminum PSDS-type oligomers.

[0121] In a third aspect, the present invention provides a method for applying the geopolymer-based marine cement material as described above, comprising the following steps:

[0122] Fill the prepared marine cement material into the support piles of the deep-sea jacket and use a heating rod to stir it evenly during the filling process;

[0123] After the curing time, remove the protective plates supporting the toe piles.

[0124] Preferably, the curing time is 7 to 10 days.

[0125] It should be noted that, at present, deep-sea jackets generally exceed 250 meters in water depth, and some even reach 300 meters in water depth. In the application scenario of deep water depth and high water pressure, the performance requirements of the marine cement material used for pouring, filling and fixing the support piles of the deep-sea jacket are higher. By utilizing the marine cement material in the above embodiment, after the deep-sea jacket is launched and placed in place, it is necessary to drive steel piles, and then grouting is carried out between the steel piles and the skirt piles, that is, in the support pile area, to fill the space with marine cement material, and use a heating rod to stir it evenly during the filling process, thereby improving the filling uniformity of the marine cement material and ensuring the curing quality, and achieving the effect of exhausting and reducing moisture. After curing, the protective plate is removed, and the marine cement can provide reliable support and fixing effects, and exhibits excellent compressive resistance and durability under deep-sea high-pressure conditions.

[0126] In summary, compared to the prior art, the above embodiments provide a geopolymer-based marine cement material, preparation method, and application method. Granulated blast furnace slag powder is used on the basis of the geopolymer composed of the first component and the second component to improve the compressive strength and deep-sea stability of the composite cement material, and fiber materials are used to increase the toughness and tensile strength of the cement material to adapt to application scenarios with high water pressure in the deep sea.

[0127] XRD pattern detection ensures that the main component of marine cement materials is metakaolin, ensuring the crystallinity and stability of the materials. FT-IR pattern analysis is also used to ensure the stability and consistency of the silicon-aluminum skeleton in marine cement materials, as well as good bonding and curing properties.

[0128] By controlling the content of mono-silicon aluminum PS type oligomers to be higher, it helps to improve the hardening speed and mechanical properties of marine cement materials.

[0129] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An application method of a geopolymer-based marine cement material, characterized in that: Fill the prepared marine cement material into the support piles of the deep-sea jacket and use a heating rod to stir it evenly during the filling process; After the curing time has passed, the protective plates of the support piles are removed; the curing time is 7 to 10 days; the water depth of the support piles exceeds 250 meters; The marine engineering cement material is composed of a first component, a second component and a third component. The marine engineering cement material is configured to form an alkali-slag-metakaolin composite cement material through a composite gelling process. The components are as follows: The first component includes: 50 to 77 parts of a composite base activator; The second component includes: 100 parts of metakaolin, 0.3-0.8 parts of fiber material, 3-5 parts of water reducer, 1-2 parts of suspending agent, 1-2 parts of coupling agent, 0.5-0.8 parts of defoaming agent, and 10-30 parts of water; The third component includes: 120-150 parts of granulated blast furnace slag powder; wherein the mass ratio of the composite alkali activator to the sum of the mass of the metakaolin and the granulated blast furnace slag powder is 0.2 to 0.35; The composite alkali activator is prepared from NaOH solution and water glass in a volume ratio of 1.5 to 2.5:1, wherein the concentration of the NaOH solution is 3 to 8 mol / L, and the modulus of the composite alkali activator is 2.5 to 3M; The fiber material is one or more of lignin fiber and polyester fiber, and the length is not less than 6 mm and not more than 18 mm; In the XRD spectrum of the marine cement material, only the quartz diffraction peak from the metakaolin exists; In the FT-IR spectrum of the marine cement material, the stretching vibration peak of TO-Si shifts to a lower wavenumber by no more than 20 wavenumbers, wherein T is Si or Al; In the FT-IR spectrum of the marine cement material, there is at least one hydroxyl absorption peak; In the marine cement material, the amount of the monosilicon aluminum PS type oligomer is 1.2 times the sum of the amount of the disilicon aluminum PSS type oligomer and the trisilicon aluminum PSDS type oligomer; The granulated blast furnace slag powder includes aluminum oxide, silicon dioxide and iron oxide.

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