Low-temperature high-strength underwater non-dispersible grouting material

Abstract

The invention provides a low-temperature high-strength underwater non-dispersible grouting material which comprises the following components in parts by weight: 70-150 parts of high belite sulphoaluminate cement; 20 to 80 parts of magnesium phosphate cement; 240 to 380 parts of ordinary Portland cement; 15 to 50 parts of a superfine filling material; 720 to 1050 parts of sand; 0.1 to 0.3 part of mineral glue; 2.0 to 5.0 parts of a water reducing agent; 0.1 to 0.2 part of crystal nucleus; 0.1 to 0.5 part of a defoaming agent; and 100 to 120 parts of water. According to the grouting material, the superfine filler and the crystal nucleus are introduced, the superfine filler and the crystal nucleus react with calcium aluminate in cement during hydration reaction, the generation amount of metastable-state hydrates is reduced, the stable-state hydrates are produced to be filled in slurry pores, the porosity is reduced, and the strength of a consolidated body is improved; the viscosity of the grouting material is reduced by using the shear dilution characteristic of the inorganic mineral glue, and the water consumption is reduced by the aid of the high-performance water reducing agent, so that the problem of underwater pouring dispersion is solved on the premise of ensuring the strength of the grouting material; by using the magnesium phosphate cement, the wear resistance and sulfate corrosion resistance of the grouting material are enhanced.

Description

Technical Field

[0001] This invention relates to the field of grouting technology under low-temperature conditions in petroleum exploration, and more specifically, to a low-temperature, high-strength, underwater non-dispersible grouting material. Background Technology

[0002] In recent years, my country's offshore wind power and oil exploration and development have developed rapidly, resulting in a large number of offshore grouting operations. In winter, the surface water temperature along the Bohai and Yellow Sea coasts does not exceed 6℃, with a minimum of -2℃. During winter grouting for offshore wind power and oil platforms in the Bohai and Yellow Sea regions, ordinary grouting materials are greatly affected by ambient temperature. Under low-temperature conditions, cement hydration is limited, and strength development is slow, seriously affecting construction progress and project quality. Ordinary low-temperature grouting materials, due to the use of high-alumina cement, sulfoaluminate cement, and other early-strength cements, result in rapid early strength development of the grout, increased porosity within the grout, and a 28-day strength that is difficult to exceed 80MPa, with a risk of strength reduction. This makes it difficult to meet the grouting requirements of marine engineering, especially offshore wind power projects. Therefore, the development of high-strength grouting materials that can be used in low-temperature environments is of great significance for offshore wind power and oil exploration and development.

[0003] Patent CN202211688629.0 discloses a low-temperature sleeve grouting material for steel bar connections and its preparation method. The low-temperature grouting material is prepared from: cement, modified silica fume, gypsum, fine aggregate, early strength agent, retarder, water-reducing agent, defoamer, expanding agent, antifreeze agent, phase change material, and water. The components are prepared in the following mass ratios: cement 800-1000 parts, modified silica fume 10-50 parts, gypsum 10-100 parts, fine aggregate 900-1100 parts, early strength agent 0.1-0.5 parts, retarder 1-3 parts, water-reducing agent 2-5 parts, defoamer 0.2-0.6 parts, expanding agent 0.1-0.5 parts, antifreeze agent 1-5 parts, phase change material 1-5 parts, and the water-to-material ratio is 0.11-0.15.

[0004] Patent CN201810951617.X discloses a high and low temperature resistant sleeve grouting material and its preparation method. The grouting material is mainly composed of cement, aggregate, admixture, polycarboxylate superplasticizer, accelerator, and retarder. The mass ratio of each component is as follows: cement 40-65, aggregate 20-40, gypsum 2-10, polycarboxylate superplasticizer 0.3-1.0, accelerator 0.05-0.3, and retarder 0.05-0.3.

[0005] In the aforementioned patents, the use of large amounts of high-alumina cement, sulfoaluminate cement, early-strength agents, and accelerators resulted in rapid early strength development of the grouting material and increased porosity within the solidified body. Consequently, the 28-day strength of the grouting material did not exceed 100 MPa, making it unsuitable for high-strength grouting projects, especially offshore wind power grouting projects. Summary of the Invention

[0006] In view of this, the present invention proposes a low-temperature, high-strength underwater non-dispersible grouting material, comprising the following components in parts by weight: high belite sulfoaluminate cement, 70-150 parts; magnesium phosphate cement, 20-80 parts; ordinary silicate cement, 240-380 parts; ultrafine filler, 15-50 parts; sand, 720-1050 parts; mineral adhesive, 0.1-0.3 parts; water-reducing agent, 2.0-5.0 parts; crystal nuclei, 0.1-0.2 parts; defoamer, 0.1-0.5 parts; and water, 100-120 parts.

[0007] Preferably, the low-temperature high-strength underwater non-dispersible grouting material comprises the following components in parts by weight: high belite sulfoaluminate cement, 110 parts; magnesium phosphate cement, 50 parts; ordinary silicate cement, 300 parts; ultrafine filler, 35 parts; sand, 930 parts; mineral adhesive, 0.2 parts; water-reducing agent, 3.0 parts; crystal nuclei, 0.2 parts; defoamer, 0.3 parts; and water, 105 parts.

[0008] Specifically, by using magnesium phosphate cement, the wear resistance and sulfate corrosion resistance of the grouting material are enhanced. Furthermore, the high belite sulfoaluminate cement is grade 42.5 with a specific surface area ≥ 450 m² / kg; the magnesium phosphate cement has an MgO content ≥ 60% and a 28-day compressive strength ≥ 60 MPa.

[0009] Furthermore, the ordinary silicate cement is grade 42.5.

[0010] Furthermore, the ultrafine filler is at least one of microspheres, silica fume, slag powder, gypsum, limestone powder, dolomite powder, and magnesium aluminum spinel powder.

[0011] Furthermore, the sand is closely packed washed sand with an MB value ≤ 1.4 and a particle size range of 0.075~0.16mm, 0.16~0.315mm, 0.315~0.63mm, 0.63~1.25mm, and 1.25~2.5mm. The mass percentage of sand in each particle size range is as follows: 0.075~0.16mm washed sand: 20.3~26.7%; 0.16~0.315mm washed sand: 12.8~18.1%; 0.315~0.63mm washed sand: 14.2~19.5%; Washed sand (0.63~1.25mm): 16.6~23.1%; 1.25~2.5mm washed sand: 21.7~28.9%.

[0012] Specifically, using tightly packed washed sand can reduce the porosity between sand particles, thereby reducing the amount of cementitious material used. The high roundness of washed sand can also increase the fluidity and workability of the grouting material.

[0013] Furthermore, the inorganic mineral adhesive is magnesium aluminum silicate.

[0014] Specifically, inorganic mineral adhesives are used, leveraging their shear-dilution properties to reduce the viscosity of the grouting material. High-performance water-reducing agents are also employed to decrease water consumption, thus addressing the dispersion problem during underwater casting while ensuring the strength of the grouting material. Furthermore, the water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate of ≥26%.

[0015] Furthermore, the crystal nucleus is a hydrated calcium silicate crystal nucleus.

[0016] Specifically, by introducing ultrafine fillers and crystal nuclei, which react with calcium aluminate in cement during hydration, the amount of metastable hydrates generated is reduced, and stable hydrates are produced to fill the pores of the slurry, thereby reducing porosity and increasing the strength of the consolidated body.

[0017] Furthermore, the defoamer is an organosilicone defoamer.

[0018] This invention provides a low-temperature, high-strength, underwater non-dispersible grouting material with the following advantages: By using tightly packed washed sand to reduce inter-sand porosity, the amount of cementitious material required is reduced; the high sphericity of the washed sand increases the fluidity and workability of the grouting material. The introduction of ultrafine fillers and crystal nuclei allows for reaction with calcium aluminate in the cement during hydration, reducing the amount of metastable hydrates and producing stable hydrates that fill the pores of the grout, further reducing porosity and increasing the strength of the solidified body. Inorganic mineral adhesives, utilizing their shear-dilution properties, reduce the viscosity of the grouting material, and a high-performance water-reducing agent further reduces water consumption, solving the dispersion problem during underwater casting while ensuring the strength of the grouting material. The use of magnesium phosphate cement enhances the wear resistance and sulfate corrosion resistance of the grouting material. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 The table shows the performance test results of the grouting materials provided for the embodiments and comparative examples of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This invention discloses a low-temperature, high-strength underwater non-dispersible grouting material, comprising the following components in parts by weight: high belite sulfoaluminate cement, 70-150 parts; magnesium phosphate cement, 20-80 parts; ordinary silicate cement, 240-380 parts; ultrafine filler, 15-50 parts; sand, 720-1050 parts; mineral adhesive, 0.1-0.3 parts; water-reducing agent, 2.0-5.0 parts; crystal nuclei, 0.1-0.2 parts; defoamer, 0.1-0.5 parts; and water, 100-120 parts.

[0022] In a preferred embodiment of the present invention, the low-temperature high-strength underwater non-dispersible grouting material comprises the following components in parts by weight: high belite sulfoaluminate cement, 110 parts; magnesium phosphate cement, 50 parts; ordinary silicate cement, 300 parts; ultrafine filler, 35 parts; sand, 930 parts; mineral adhesive, 0.2 parts; water-reducing agent, 3.0 parts; crystal nuclei, 0.2 parts; defoamer, 0.3 parts; and water, 105 parts.

[0023] In this embodiment, high belite sulfoaluminate cement of grade 42.5 with a specific surface area ≥450㎡ / kg is used; magnesium phosphate cement with MgO content ≥60% and 28d compressive strength ≥60MPa is used.

[0024] Preferably, the ordinary silicate cement is grade 42.5.

[0025] In this embodiment, the ultrafine filler is at least one of microspheres, silica fume, slag powder, gypsum, limestone powder, dolomite powder, and magnesium aluminum spinel powder.

[0026] In this embodiment, the selected sand is closely packed washed sand with an MB value ≤ 1.4 and a particle size range of 0.075~0.16mm, 0.16~0.315mm, 0.315~0.63mm, 0.63~1.25mm, and 1.25~2.5mm. The mass percentage of sand in each particle size range is as follows: 0.075~0.16mm washed sand: 20.3~26.7%; 0.16~0.315mm washed sand: 12.8~18.1%; 0.315~0.63mm washed sand: 14.2~19.5%; Washed sand (0.63~1.25mm): 16.6~23.1%; 1.25~2.5mm washed sand: 21.7~28.9%.

[0027] In this embodiment, the selected inorganic mineral adhesive is preferably magnesium aluminum silicate. The selected water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate ≥26%. The selected crystal nuclei are hydrated calcium silicate crystal nuclei. The selected defoamer is an organosilicon defoamer.

[0028] A preferred embodiment of preparing a low-temperature, high-strength underwater non-dispersible grouting material using the method described in the above examples is as follows: Example 1 The low-temperature, high-strength underwater non-dispersible grouting material in this embodiment is prepared using the following components in parts by weight: 70 parts of high belite sulfoaluminate cement; 20 parts of magnesium phosphate cement; 380 parts of ordinary Portland cement; 20 parts of ultrafine filler; Washed sand: 810 parts, of which the mass percentage of sand in each particle size range is as follows: 0.075~0.16mm: 20.5%; 0.16~0.315mm: 18.1%; 0.315~0.63mm: 15.5%; 0.63~1.25mm: 17.6%; 1.25~2.5mm: 28.3%; 0.3 parts mineral glue; 5.0 parts of water-reducing agent; 0.1 part of crystal nucleus; 0.4 parts of defoamer; 100 portions of water.

[0029] Example 2 The low-temperature, high-strength underwater non-dispersible grouting material in this embodiment is prepared using the following components in parts by weight: 85 parts of high-belite sulfoaluminate cement; 35 parts of magnesium phosphate cement; 340 parts of ordinary Portland cement; 25 parts of ultrafine filler; Washed sand: 720 parts, of which the mass percentage of sand in each particle size range is as follows: 0.075~0.16mm: 22.6%; 0.16~0.315mm: 17.1%; 0.315~0.63mm: 16.2%; 0.63~1.25mm: 22.7%; 1.25~2.5mm: 21.4%; 0.2 parts mineral glue; 4.0 parts water-reducing agent; 0.2 parts of crystal nucleus; 0.2 parts of defoamer; 110 portions of water.

[0030] Example 3 The low-temperature, high-strength underwater non-dispersible grouting material in this embodiment is prepared using the following components in parts by weight: 110 parts of high belite sulfoaluminate cement; 50 parts of magnesium phosphate cement; 300 parts of ordinary Portland cement; 35 parts of ultrafine filler; Washed sand: 930 parts, of which the mass percentage of sand in each particle size range is as follows: 0.075~0.16mm: 23.5%; 0.16~0.315mm: 16.1%; 0.315~0.63mm: 17.3%; 0.63~1.25mm: 19.9%; 1.25~2.5mm: 23.2%; 0.2 parts mineral glue; 3.0 parts water-reducing agent; 0.2 parts of crystal nucleus; 0.3 parts of defoamer; 105 parts water.

[0031] Example 4 The low-temperature, high-strength underwater non-dispersible grouting material in this embodiment is prepared using the following components in parts by weight: 130 parts of high belite sulfoaluminate cement; 65 parts of magnesium phosphate cement; 280 parts of ordinary Portland cement; 40 parts of ultrafine filler; Washed sand: 980 parts, of which the mass percentage of sand in each particle size range is as follows: 0.075~0.16mm: 24.7%; 0.16~0.315mm: 15.1%; 0.315~0.63mm: 14.2%; 0.63~1.25mm: 20.1%; 1.25~2.5mm: 25.9%; 0.1 parts mineral glue; 3.5 parts water-reducing agent; 0.1 part of crystal nucleus; 0.5 parts of defoamer; 115 portions of water.

[0032] Example 5 The low-temperature, high-strength underwater non-dispersible grouting material in this embodiment is prepared using the following components in parts by weight: 150 parts of high-belite sulfoaluminate cement; 80 parts of magnesium phosphate cement; 240 parts of ordinary Portland cement; 50 parts of ultrafine filler; Washed sand: 1050 parts, of which the mass percentage of sand in each particle size range is as follows: 0.075~0.16mm: 26.7%; 0.16~0.315mm: 16.8%; 0.315~0.63mm: 16.2%; 0.63~1.25mm: 19.1%; 1.25~2.5mm: 20.2%; 0.3 parts mineral glue; 4.0 parts water-reducing agent; 0.1 part of crystal nucleus; 0.1 parts of defoamer; 115 portions of water.

[0033] Comparative Example 1 160 parts of ordinary silicate cement, 640 parts of sulfoaluminate cement, 70 parts of high-alumina cement, 40 parts of modified silica fume, 90 parts of gypsum, 1000 parts of fine aggregate, 0.5 parts of early strength agent, 2.5 parts of retarder, 0.4 parts of defoamer, 4.5 parts of water-reducing agent, 0.2 parts of expanding agent, 2 parts of antifreeze agent, and 2 parts of phase change material.

[0034] Comparative Example 2 570 parts of ordinary silicate cement, 100 parts of sulfoaluminate cement, 200 parts of high-alumina cement, 40 parts of ordinary silica fume, 90 parts of gypsum, 1000 parts of fine aggregate, 0.5 parts of early strength agent, 2.5 parts of retarder, 0.4 parts of defoamer, 4.5 parts of water-reducing agent, 0.2 parts of expanding agent, 2 parts of antifreeze agent, and 2 parts of phase change material.

[0035] The performance tests of the grouting materials prepared in Examples 1-5 above are as follows: Test the compressive strength of low-temperature high-strength underwater non-dispersible grouting materials according to GB / T 17671-1999; The anti-dispersion performance of low-temperature high-strength underwater non-dispersible grouting materials was tested according to GB / T 37990-2019.

[0036] See appendix Figure 1 Table 1 shows the performance test results of the low-temperature high-strength underwater non-dispersible grouting materials prepared in Examples 1-5 and Comparative Examples 1-2.

[0037] Based on the test results of Examples 1-5 and Comparative Examples 1-2 above, it can be seen that the grouting material of Comparative Example 1 has low strength and cannot meet the requirements for use under low temperature conditions; although the sleeve grouting material in Comparative Example 2 can meet the requirements for use, its strength does not exceed 100MPa; and neither Comparative Examples 1 nor 2 have underwater anti-dispersion properties and cannot be directly poured underwater. However, the low-temperature high-strength grouting material provided by the present invention has good performance and is a high-performance grouting material with good fluidity, no underwater dispersion, rapid early strength development, and high late strength.

[0038] This invention provides a low-temperature, high-strength, underwater non-dispersible grouting material with the following beneficial technical effects: By using tightly packed washed sand to reduce inter-sand porosity, the amount of cementitious material required is reduced; the high sphericity of the washed sand increases the fluidity and workability of the grouting material; the introduction of ultrafine fillers and crystal nuclei allows them to react with calcium aluminate in the cement during hydration, reducing the amount of metastable hydrates generated and producing stable hydrates that fill the pores of the grout, further reducing porosity and increasing the strength of the solidified body; the use of inorganic mineral adhesives, utilizing their shear-dilution properties, reduces the viscosity of the grouting material, and the addition of a high-performance water-reducing agent further reduces water consumption, solving the dispersion problem during underwater casting while ensuring the strength of the grouting material; and the use of magnesium phosphate cement enhances the wear resistance and sulfate corrosion resistance of the grouting material.

[0039] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0040] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A low-temperature, high-strength, underwater non-dispersible grouting material, characterized in that, It comprises the following components in parts by weight: high belite sulfoaluminate cement, 70-150 parts; magnesium phosphate cement, 20-80 parts; ordinary silicate cement, 240-380 parts; ultrafine filler, 15-50 parts; sand, 720-1050 parts; inorganic mineral adhesive, 0.1-0.3 parts; water-reducing agent, 2.0-5.0 parts; crystal nuclei, 0.1-0.2 parts; defoamer, 0.1-0.5 parts; and water, 100-120 parts.

2. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The composition includes the following components in parts by weight: high belite sulfoaluminate cement, 110 parts; magnesium phosphate cement, 50 parts; ordinary silicate cement, 300 parts; ultrafine filler, 35 parts; sand, 930 parts. Mineral glue, 0.2 parts; water-reducing agent, 3.0 parts; crystal nuclei, 0.2 parts; defoamer, 0.3 parts; water, 105 parts.

3. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1 or 2, characterized in that, The high belite sulfoaluminate cement is grade 42.5 with a specific surface area ≥ 450 m² / kg; the magnesium phosphate cement has an MgO content ≥ 60% and a 28-day compressive strength ≥ 60 MPa.

4. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The ordinary silicate cement is grade 42.

5.

5. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The ultrafine filler is at least one of the following: microspheres, silica fume, slag powder, gypsum, limestone powder, dolomite powder, and magnesium aluminum spinel powder.

6. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The sand is tightly packed washed sand with an MB value ≤ 1.4 and a particle size range of 0.075~0.16mm, 0.16~0.315mm, 0.315~0.63mm, 0.63~1.25mm, and 1.25~2.5mm. The mass percentage of sand in each particle size range is as follows: 0.075~0.16mm washed sand: 20.3~26.7%; 0.16~0.315mm washed sand: 12.8~18.1%; 0.315~0.63mm washed sand: 14.2~19.5%; Washed sand (0.63~1.25mm): 16.6~23.1%; 1.25~2.5mm washed sand: 21.7~28.9%.

7. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The inorganic mineral adhesive is magnesium aluminum silicate.

8. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate of ≥26%.

9. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The crystal nucleus is a hydrated calcium silicate crystal nucleus.

10. The low-temperature, high-strength underwater non-dispersible grouting material according to claim 1, characterized in that, The defoamer is an organosilicone defoamer.

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