Ultra-low temperature grouting connection material for a wind power tower, preparation method thereof and construction method

Abstract

The present invention discloses a cryogenic mortar joint connecting material for a wind power tower, its preparation method and construction method. The cryogenic mortar joint connecting material for the wind power tower comprises the following components in parts by weight: 45-55 parts of cement, 30-35 parts of aggregate, 5-15 parts of amorphous calcium aluminate powder, 1-5 parts of functional admixture, 0.5-1.5 parts of compound expansive agent, 0.1-1 part of whisker, 0.1-0.5 part of micro-nano nucleating agent, 0.1-1 part of water reducing agent, 0.01-0.1 part of defoaming agent, 0.1-1 part of setting regulator, and 0.01-0.1 part of rust inhibitor. The cryogenic mortar joint connecting material for the wind power tower in the present invention has good low-temperature hydration and hardening properties, ultra-early strength, high long-term strength, and also has good expansion properties and excellent durability.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials. Specifically, the present invention relates to an ultra-low temperature grouting connection material for wind power tower structures, and its preparation method and construction method. Background Art

[0002] As an important part of new energy in China, wind energy has developed rapidly, and the construction demand for wind power tower structures, especially concrete tower structures, is increasing day by day. Wind energy resources in China are the richest in regions such as Xinjiang and Inner Mongolia. The natural environment in these regions is often relatively harsh. Among them, the low temperature in Xinjiang reaches below -30°C, and the extreme low temperature even breaks through -50°C, which poses a severe test to the construction of wind power tower structures, especially the performance and construction of connection materials for wind power tower structures.

[0003] Existing materials and construction technologies cannot cope with the above problems. For example, Chinese Patent CN113336505A discloses a grouting mortar for low-temperature prefabricated buildings, but this grouting mortar can only be applicable to a low temperature of -5°C; another example is that Chinese Patent CN114853436A discloses a low-temperature grouting material and its usage method, which is applicable to a low temperature of -5°C to -10°C; and Chinese Patent CN116854438B discloses an ultra-low temperature grouting material for wind power steel-concrete tower structures, and this grouting material can hydrate and harden at -20°C, but it cannot solve problems such as construction at lower temperatures and the continuous decrease in temperature after construction, resulting in the material not reaching the designed strength.

[0004] It can be seen that in order to meet the rapid development needs of China's wind energy industry, there is an urgent need in the industry for a connection material that can be applicable to lower temperatures and a more scientific construction method to ensure the smooth progress of the construction of wind power tower structures in regions rich in wind energy resources in China. Summary of the Invention

[0005] The present invention discloses an ultra-low temperature grouting connection material for wind power tower structures, and its preparation method and construction method, so as to realize the grouting connection construction of wind power tower structures in an ultra-low temperature environment, and through an intelligent temperature control system, ensure the normal development of material strength and cope with situations such as large day-night temperature differences and continuous decrease in temperature after construction.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides an ultra-low temperature grouting connection material for wind power tower structures, which comprises the following components in parts by weight: 45 - 55 parts of cement, 30 - 35 parts of aggregate, 5 - 15 parts of amorphous calcium aluminate powder, 1 - 5 parts of functional admixture, 0.5 - 1.5 parts of compound expansion agent, 0.1 - 1 part of whisker, 0.1 - 0.5 part of micro-nano nucleating agent, 0.1 - 1 part of water reducing agent, 0.01 - 0.1 part of defoaming agent, 0.1 - 1 part of setting regulator, and 0.01 - 0.1 part of rust inhibitor.

[0008] In some embodiments, the cement comprises a mixture of magnesium phosphate cement and Portland cement, and the mass ratio of the magnesium phosphate cement to the Portland cement is 1:4 - 1:19;

[0009] Preferably, the magnesium phosphate cement comprises a mixture of dead-burned magnesia and ammonium dihydrogen phosphate, and the mass ratio of the dead-burned magnesia to the ammonium dihydrogen phosphate is 2:1 - 5:1;

[0010] Preferably, the Portland cement is Portland cement of grade P·I525 or Portland cement of grade P·II525.

[0011] In some embodiments, the aggregate comprises at least one of round steel sand, emery, quartz sand, mountain sand, and river sand, and the gradation of each sand comprises at least one of 10 - 30 mesh, 20 - 40 mesh, 30 - 50 mesh, 40 - 70 mesh, and 70 - 140 mesh.

[0012] In some embodiments, the functional admixture comprises at least one of glass microspheres, silica fume, and slag.

[0013] In some embodiments, the compound expansive agent comprises a plastic expansive agent and a hardening expansive agent;

[0014] Preferably, the plastic expansive agent is an azodicarbonamide-based plastic expansive agent;

[0015] Preferably, the hardening expansive agent is at least one of a calcium oxide-based expansive agent, a calcium sulfoaluminate-based expansive agent, and a magnesium oxide-based expansive agent.

[0016] In some embodiments, the whisker is a calcium carbonate whisker;

[0017] Preferably, the calcium carbonate whisker has a length of 20 - 30 μm, a diameter of 0.5 - 2 μm, an elastic modulus of 450 - 700 GPa, and a tensile strength of 4 - 5.5 GPa.

[0018] In some embodiments, the micro-nucleating agent is nano-calcium carbonate;

[0019] Preferably, the nano-calcium carbonate has a particle size of 25 - 100 nm.

[0020] In some embodiments, the water reducing agent is a polycarboxylate-based high-efficiency powdered water reducing agent;

[0021] And / or, the defoaming agent is an organosilane defoaming agent;

[0022] And / or, the setting regulator comprises a mixture of borax and tartaric acid, and the mass ratio of the borax to the tartaric acid is 1:1 - 1:5;

[0023] And / or, the rust inhibitor is an alcohol amine rust inhibitor.

[0024] In a second aspect, an embodiment of the present invention further provides a preparation method of the cryogenic grouting connection material for a wind power tower described in the first aspect, including the following steps: mixing cement, aggregate, amorphous calcium aluminate powder, functional admixture, compound expansive agent, whisker, micro-nano nucleating agent, water reducing agent, defoaming agent, setting regulator, and rust inhibitor in proportion, and then encapsulating them in a moisture-proof package to obtain the cryogenic grouting connection material for a wind power tower.

[0025] In a third aspect, an embodiment of the present invention further provides a construction method of the cryogenic grouting connection material for a wind power tower described in the first aspect, including the following steps:

[0026] (1) Mix the grouting connection material with water to obtain a mixture; the grouting connection material is the cryogenic grouting connection material for a wind power tower according to any one of claims 1-8;

[0027] (2) Lay heating tapes circumferentially on the foundation of the wind power tower and the segment, with a spacing of 10-20 cm;

[0028] (3) Pour the mixture on the plane of the wind power tower and the foundation, and completely cover the heating tape; after pouring, bury a temperature sensor, and the burial position is 5-10 cm away from the heating tape;

[0029] (4) Lift and install the segment;

[0030] (5) Install a temperature acquisition device and a temperature real-time monitoring and control terminal, and use a generator or a civil power line to supply power to the on-site equipment;

[0031] (6) Regulate the temperature change of the grouting connection material through the assistance of the heating tape and real-time monitoring.

[0032] In some embodiments, in the step (1), the mass ratio of the grouting connection material to the water is 1:(0.10-0.13).

[0033] The advantages and beneficial effects of the embodiments of the present invention are as follows:

[0034] (1) The cryogenic grouting connection material for a wind power tower in the embodiments of the present invention has good working performance, a long operable time, good water retention. The slurry obtained after mixing it with water has high workability, does not sag, has good water retention, and can maintain a soft and sticky state for a long time. The operation time is more than 1 h, which can ensure the orderly progress of construction.

[0035] (2) The ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention has good low-temperature hydration and hardening properties, ultra-early strength, and high long-term strength. After adding water and mixing for pouring, it can achieve self-heating hardening at an ultra-low temperature of -25°C, with high strength at 4h and high strength at 28d.

[0036] (3) The ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention has good expansion properties. After being stirred and mixed with water, it can maintain a slightly expanded state for a long time.

[0037] (4) The ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention has a dense microstructure after being stirred and mixed with water. After hardening, it exhibits excellent durability, and this jointing material does not corrode steel bars.

[0038] (5) The ultra-low temperature bedding jointing material and construction method for wind power tower frames in the embodiments of the present invention can be adapted to ultra-low temperature construction. The temperature of the material is monitored in real time after pouring and intelligently adjusted, which can avoid the influence of harsh conditions such as large day-night temperature differences and continuous decrease in temperature after construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram showing the regulation effect of shrinkage amount by compounding expansive agents with different weight parts of the ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention.

[0040] Figure 2 It is a schematic diagram showing the relationship between micro-nucleating agents with different weight parts and compressive strength of the ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention.

[0041] Figure 3 It is a schematic diagram showing the connection construction of the ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention.

[0042] Figure 4 It is a schematic diagram showing the construction of the application of auxiliary heating by heat tracing tape under ultra-low temperature conditions for the construction method of the ultra-low temperature bedding jointing material for wind power tower frames in the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The embodiments of the present invention are described in detail below. The described embodiments are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] In this article, when a value is described as a range, it should be understood that such disclosure includes the disclosure of all possible sub-ranges within that range, as well as the specific numerical values falling within that range, regardless of whether the specific numerical values or specific sub-ranges are explicitly indicated.

[0045] In this article, the words "comprising" and "including" and their various variants mean that other elements or wholes that may be included are allowed but not specifically described.

[0046] In this text, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0047] In a first aspect, an ultra-low temperature grouting connection material for a wind power tower is proposed according to an embodiment of the present invention, which includes the following components in parts by weight: 45-55 parts of cement, 30-35 parts of aggregate, 5-15 parts of amorphous calcium aluminate powder, 1-5 parts of functional admixture, 0.5-1.5 parts of compound expansion agent, 0.1-1 part of whisker, 0.1-0.5 part of micro-nano nucleating agent, 0.1-1 part of water reducing agent, 0.01-0.1 part of defoaming agent, 0.1-1 part of setting regulator, and 0.01-0.1 part of rust inhibitor.

[0048] The functional mechanism of the ultra-low temperature grouting connection material for a wind power tower proposed according to an embodiment of the present invention is as follows:

[0049] (1) Good workability, long operable time, and good water retention:

[0050] The ultra-low temperature grouting connection material for a wind power tower in the embodiment of the present invention has high workability, does not sag, has good water retention, and maintains a soft and sticky state for a long time after being mixed with water and stirred. The operable time is more than 1 h, which can ensure the orderly progress of construction. Figure 3 as shown

[0051] Firstly, in one aspect, whiskers are introduced into the grouting connection material in the embodiment of the present invention. After the grouting connection material is mixed, the whiskers can adsorb the mixing water and play a micron-level overlapping role, making the freshly mixed slurry have an anti-sagging effect. On the other hand, the setting regulator component in the grouting connection material in the embodiment of the present invention can effectively control the hardening speed of the grouting connection material slurry after mixing, extend the retention time of the soft and sticky state of the slurry, and achieve an operable time of more than 1 h.

[0052] (2) Good low-temperature hydration and hardening performance, ultra-early strength, and high long-term strength:

[0053] After the ultra-low temperature grouting connection material for a wind power tower in the embodiment of the present invention is mixed with water and poured, it can achieve self-heating hardening at an ultra-low temperature of -25°C, with high strength at 4 h and high strength at 28 d.

[0054] The strength development of the bedding joint material shows a four-stage relay growth: The first stage is the hydration reaction of magnesium phosphate cement, which is essentially an acid-base neutralization reaction with a fast reaction rate and a large heat release. It can provide the strength in the first stage and heat for subsequent reactions. The second stage is the hydration reaction of amorphous calcium aluminate powder. This reaction also has the characteristics of a fast hydration reaction rate and heat release during the hydration process, and can significantly promote the hydration of portland cement. The third stage is the reaction of ordinary portland cement. The reaction rate in this stage is relatively slow, but the strength growth duration is longer, and the strength growth amplitude in the later stage is larger. The fourth stage is the pozzolanic reaction of the functional admixture and its fine pore filling effect, which further supplements and enhances the strength of the bedding joint material paste after hardening. After the bedding joint material prepared in the embodiment of the present invention is mixed with water, the above four-stage reactions proceed continuously. After the paste hardens, it has the characteristics of ultra-early strength and high long-term strength, and has the ability of self-heating and self-hydration hardening in a low-temperature environment above -25°C. At the same time, the addition of the micro-nucleating agent can reduce the wrapping effect of hydration products on cement clinker, make the clinker hydration more sufficient, and the strength develops faster and higher (as Figure 2 shown). After the whiskers harden during the hydration of cement, they play a fiber bridging role to further increase the strength of the hardened paste.

[0055] On the other hand, at extremely low temperatures below -25°C, the self-hydration hardening ability of the bedding joint material may be affected. At this time, as Figure 4 shown, the intelligent temperature control system with a heating tape can be used to provide initial heat for the hydration reaction of the paste, so that the hydration reaction of the paste can be started and proceed spontaneously and continuously.

[0056] (3) Good expansion performance:

[0057] The ultra-low temperature bedding joint material for wind power tower frames in the embodiment of the present invention can maintain a slightly expanded state for a long time after being mixed with water and stirred. As Figure 1 shown, through the relay expansion effect of its compound expansion agent components, the bedding joint material can achieve the performance of maintaining slight expansion for a long time in the plastic state after initial mixing and after hardening.

[0058] First, the plastic expansion agent starts to work after the initial setting of the paste, and the duration is about 12 hours. Second, the calcium oxide type expansion agent starts to work at about 12 hours, and the duration is about 3 days. Third, the calcium sulfoaluminate type expansion agent works for about 28 days. Fourth, the magnesium oxide type expansion agent shows that the initial expansion effect is not obvious, while the later expansion effect can last for 2 to 3 years. Through the synergistic effect of different types of expansion agents, relay expansion is achieved, so as to achieve the performance of maintaining slight expansion for a long time.

[0059] (4) Excellent durability and delay of steel bar corrosion:

[0060] The ultra-low temperature grouting connection material for a wind power tower in the embodiments of the present invention has a dense microstructure after being stirred and mixed with water, and excellent durability after hardening.

[0061] First, when designing the components of the grouting connection material, according to the principle of closest packing, the aggregate, cement, admixture, and micro-nano nucleating agent are filled in sequence to achieve the refinement relay of pore size. As a result, the microstructure of the grouting connection material is dense after hardening, and its impermeability and corrosion resistance are both good. Furthermore, it has high durability and can also protect the steel bars. Second, the fiber bridging effect of the whiskers can significantly enhance the toughness of the hardened paste, improve the anti-fatigue ability and freeze-thaw cycle resistance of the paste, thus effectively improving the durability. In addition, the alkanolamine rust inhibitor component in the grouting connection material can inhibit the anodic reaction or cathodic reaction of steel bar corrosion by forming a dense and stable protective film on the surface of the steel bars, thereby reducing the corrosion damage of the steel bars and further delaying the corrosion of the steel bars.

[0062] In some embodiments, the cement includes a mixture of magnesium phosphate cement and portland cement, and the mass ratio of the magnesium phosphate cement to the portland cement is 1:4 - 1:19. Non-limiting examples include: 1:4, 1:5, 1:9, 1:10, 1:12, 1:15, 1:19, etc.

[0063] Preferably, the magnesium phosphate cement includes a mixture of dead-burned magnesite and ammonium dihydrogen phosphate, and the mass ratio of the dead-burned magnesite to the ammonium dihydrogen phosphate is 2:1 - 5:1. Non-limiting examples include: 2:1, 3:1, 4:1, 5:1, etc.

[0064] Preferably, the portland cement is P·I 525 grade portland cement or P·II 525 grade portland cement.

[0065] In some embodiments, the aggregate includes at least one of round steel sand, emery, quartz sand, mountain sand, and river sand, and the particle size distribution of each sand includes at least one of 10 - 30 mesh, 20 - 40 mesh, 30 - 50 mesh, 40 - 70 mesh, and 70 - 140 mesh.

[0066] In some embodiments, the amorphous calcium aluminate powder is an off-white powder obtained by high-temperature calcination of raw materials such as waste aluminum slag and limestone.

[0067] In some embodiments, the functional admixture includes at least one of glass microspheres, silica fume, and slag.

[0068] In some embodiments, the compound expansion agent includes a plastic expansion agent and a hardening expansion agent;

[0069] Preferably, the plastic expansion agent is an azodicarbonamide-based plastic expansion agent;

[0070] Preferably, the hardening expansive agent is at least one of calcium oxide type expansive agent, calcium sulfoaluminate type expansive agent, and magnesium oxide type expansive agent.

[0071] In some embodiments, the whisker is calcium carbonate whisker;

[0072] Preferably, the calcium carbonate whisker has a length of 20 - 30 μm, a diameter of 0.5 - 2 μm, an elastic modulus of 450 - 700 GPa, and a tensile strength of 4 - 5.5 GPa.

[0073] In some embodiments, the micro - nano nucleating agent is nano - calcium carbonate;

[0074] Preferably, the particle size of the nano - calcium carbonate is 25 - 100 nm, and non - limiting examples include: 25 nm, 50 nm, 60 nm, 80 nm, 100 nm, etc.

[0075] In some embodiments, the water - reducing agent is a polycarboxylate - type high - efficiency powdered water - reducing agent;

[0076] And / or, the defoaming agent is an organosilane defoaming agent;

[0077] And / or, the setting - time regulator includes a mixture of borax and tartaric acid, and the mass ratio of borax to tartaric acid is 1:1 - 1:5, and non - limiting examples include: 1:1, 1:2, 1:3, 1:4, 1:5, etc.;

[0078] And / or, the rust inhibitor is an alcohol - amine type rust inhibitor.

[0079] Second, the embodiments of the present invention also propose a preparation method of the ultra - low - temperature grouting connection material for a wind power tower as described in the first aspect, including the following steps: Mix cement, aggregate, amorphous calcium aluminate powder, functional admixture, compound expansive agent, whisker, micro - nano nucleating agent, water - reducing agent, defoaming agent, setting - time regulator, and rust inhibitor evenly in proportion, and then encapsulate them in a moisture - proof package to obtain the ultra - low - temperature grouting connection material for the wind power tower.

[0080] Third, the embodiments of the present invention also propose a construction method of the ultra - low - temperature grouting connection material for a wind power tower as described in the first aspect, including the following steps:

[0081] (1) Stir and mix the grouting connection material with water to obtain a mixture; the grouting connection material is the ultra - low - temperature grouting connection material for a wind power tower according to any one of claims 1 - 8;

[0082] (2) Lay heating tapes circumferentially on the foundation and segment of the wind power tower at intervals of 10 - 20 cm;

[0083] (3) Pour the mixture on the wind power tower and the foundation plane, and completely cover the heating tape; after pouring, bury the temperature sensor, and the burial position is 5-10 cm away from the heating tape;

[0084] (4) Hoist the segment.

[0085] (5) Install the temperature acquisition device and the temperature real-time monitoring and control terminal, and use a generator or a civil power line to supply power to the on-site equipment;

[0086] (6) Through the assistance of the heating tape and real-time monitoring, regulate the temperature change of the grouting connection material, so as to ensure that the grout of the grouting connection material is not frozen in the extremely harsh environment of -30°C, and ensure the stable and reliable development of its strength.

[0087] In some embodiments, in the step (1), the mass ratio of the grouting connection material to the water is 1:(0.10-0.13).

[0088] The ultra-low temperature grouting connection material and construction method for a wind power tower in the embodiments of the present invention can adapt to construction at -30°C ultra-low temperature and ensure the normal development of the strength of the grouting connection material.

[0089] Before the start of pouring, the intelligent temperature control system of the heating tape starts to preheat; during the pouring process, the temperature sensor starts to detect the temperature of the grout in real time, and the controller adjusts the power of the heating tape in real time according to the temperature data transmitted back by the temperature sensor. If the temperature measured by the sensor is lower than -10°C, the power of the heating tape is increased; if it is higher than 10°C, the power of the heating tape is reduced or the power supply to the heating tape is stopped, so as to realize the real-time monitoring and regulation of the temperature of the grout. After the pouring is completed, the intelligent temperature control system of the heating tape still continues to work. In case of problems such as a sudden drop in ambient temperature and a large temperature difference between day and night, the function of adjusting the power of the heating tape in real time with the temperature of the grout will still continue to play. When the strength of the grouting connection material no longer increases due to the influence of temperature drop, the intelligent temperature control system of the heating tape can be withdrawn from the construction site.

[0090] The following are non-limiting embodiments and comparative examples of the present invention. It should be noted that: the solutions of the comparative examples are not prior art, but are only set up for comparison with the solutions of the embodiments, and are not used as a limitation to the present invention. Unless otherwise specified, all raw materials used in the embodiments and comparative examples are conventional commercially available products, or can be prepared by known methods.

[0091] Example 1

[0092] An ultra-low temperature grouting connection material for a wind power tower, comprising the following components in parts by weight:

[0093] 50 parts of cement, 35 parts of aggregate, 10 parts of amorphous calcium aluminate powder, 2 parts of functional admixture, 1 part of compound expansive agent, 0.5 part of calcium carbonate whisker, 0.5 part of nano calcium carbonate, 0.4 part of polycarboxylic acid type high-efficiency powder water reducer, 0.05 part of organosilane defoamer, 0.5 part of setting regulator, 0.05 part of alkanolamine rust inhibitor.

[0094] Among them, the cement includes 5 parts of magnesium phosphate cement and 45 parts of P·II525 grade portland cement;

[0095] The aggregate includes 14 parts of emery with 30-50 mesh, 14 parts of emery with 40-70 mesh and 7 parts of river sand with 70-140 mesh;

[0096] The functional admixture includes 1 part of glass microspheres and 1 part of silica fume;

[0097] The compound expansive agent includes 0.01 part of azodicarbonamide type plastic expansive agent, 0.39 part of calcium oxide type expansive agent, 0.4 part of calcium sulfoaluminate type expansive agent and 0.2 part of magnesium oxide type expansive agent;

[0098] The setting regulator includes 0.1 part of borax and 0.4 part of tartaric acid.

[0099] Example 2

[0100] This example is basically the same as Example 1, the difference is that: the weight part of the compound expansive agent is 0.5 part.

[0101] Example 3

[0102] This example is basically the same as Example 1, the difference is that: the weight part of the compound expansive agent is 1.5 parts.

[0103] Example 4

[0104] This example is basically the same as Example 1, the difference is that: the weight part of the nano calcium carbonate is 0.25 part.

[0105] Comparative Example 1

[0106] This comparative example is basically the same as Example 1, the difference is that: the amorphous calcium aluminate powder is not added in the components of the ultra-low temperature grouting connection material for wind power tower.

[0107] Comparative Example 2

[0108] This comparative example is basically the same as Example 1, the difference is that: the compound expansive agent is not added in the components of the ultra-low temperature grouting connection material for wind power tower.

[0109] Comparative Example 3

[0110] This comparative example is basically the same as Example 1, except that: calcium carbonate whiskers are not added to the components of the cryogenic grouting connection material for the wind power tower in this comparative example.

[0111] Comparative Example 4

[0112] This comparative example is basically the same as Example 1, except that: nano-calcium carbonate is not added to the components of the cryogenic grouting connection material for the wind power tower in this comparative example.

[0113] The properties of the grouting connection materials prepared in Example 1 of the present invention and Comparative Examples 1-4 were tested. Among them, the slurry preparation, testing, and specimen molding temperature was -25 °C, and the strength specimens were transferred to standard curing at 7 days of age. The testing methods refer to GB / T 2419-2005 "Determination Method for Fluidity of Cement Mortar" and GB / T 17671-2021 "Testing Method for Strength of Cement Mortar (IOS Method)", and the test results are shown in Table 1.

[0114] Table 1

[0115]

[0116] As can be seen from Table 1, compared with the grouting connection materials in the comparative examples, by optimizing the formula composition of the cryogenic grouting connection material for the wind power tower in the examples of the present invention, the prepared grouting connection material has high workability, good expansion performance, and high compressive strength.

[0117] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0118] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An ultra-low temperature grouting connection material for a wind power tower, characterized in that, It is composed of the following components in parts by weight: 45 - 55 parts of cement, 30 - 35 parts of aggregate, 5 - 15 parts of amorphous calcium aluminate powder, 1 - 5 parts of functional admixture, 0.5 - 1.5 parts of compound expansive agent, 0.1 - 1 part of whisker, 0.1 - 0.5 part of micro - nano nucleating agent, 0.1 - 1 part of water - reducing agent, 0.01 - 0.1 part of defoaming agent, 0.1 - 1 part of setting - adjusting agent, 0.01 - 0.1 part of rust inhibitor; wherein, the cement includes a mixture of magnesium phosphate cement and portland cement, and the mass ratio of the magnesium phosphate cement to the portland cement is 1:4 - 1:19; the functional admixture includes at least one of glass microspheres, silica fume, and slag; the compound expansive agent includes a plastic expansive agent and a hardening expansive agent; the whisker is a calcium carbonate whisker; the micro - nano nucleating agent is nano - calcium carbonate with a particle size of 25 - 100 nm; the setting - adjusting agent includes a mixture of borax and tartaric acid, and the mass ratio of the borax to the tartaric acid is 1:1 - 1:

5.

2. The cryogenic grouting connection material for a wind power tower according to claim 1, characterized in that, The magnesium phosphate cement includes a mixture of dead - burned magnesia and ammonium dihydrogen phosphate, and the mass ratio of the dead - burned magnesia to the ammonium dihydrogen phosphate is 2:1 - 5:1; and / or, the portland cement is P·I 525 - grade portland cement or P·II 525 - grade portland cement.

3. The cryogenic grouting connection material for a wind power tower according to claim 1, characterized in that, The aggregate includes at least one of round steel sand, emery, quartz sand, mountain sand, and river sand, and the grading of each sand includes at least one of 10 - 30 mesh, 20 - 40 mesh, 30 - 50 mesh, 40 - 70 mesh, and 70 - 140 mesh.

4. The cryogenic grouting connection material for a wind power tower according to claim 1, wherein, The plastic expansive agent is an azodicarbonamide - type plastic expansive agent; and / or, the hardening expansive agent is at least one of calcium oxide - type expansive agent, calcium sulfoaluminate - type expansive agent, and magnesium oxide - type expansive agent.

5. The cryogenic grouting connection material for a wind power tower according to claim 1, characterized in that, The calcium carbonate whisker has a length of 20 - 30 μm, a diameter of 0.5 - 2 μm, an elastic modulus of 450 - 700 GPa, and a tensile strength of 4 - 5.5 GPa.

6. The cryogenic grouting connection material for a wind power tower according to claim 1, characterized in that The water - reducing agent is a polycarboxylate - type high - efficiency powdered water - reducing agent; and / or, the defoaming agent is an organosilane defoaming agent; and / or, the rust inhibitor is an alcohol - amine - type rust inhibitor.

7. A preparation method of a cryogenic grouting connection material for a wind power tower as described in any one of claims 1-6, characterized in that, It includes the following steps: After mixing the cement, aggregate, amorphous calcium aluminate powder, functional admixture, compound expansive agent, whisker, micro - nano nucleating agent, water - reducing agent, defoaming agent, setting - adjusting agent, and rust inhibitor evenly in proportion, they are encapsulated in a moisture - proof package to obtain the cryogenic grouting connection material for wind power tower frames.

8. A construction method of the cryogenic grouting connection material for a wind power tower as described in any one of claims 1-6, characterized in that, It includes the following steps: (1) Mix the grouting connection material and water to obtain a mixture; (2) Lay heating tapes circumferentially on the foundation of the wind power tower and the segment, with a spacing of 10 - 20 cm; (3) Pour the mixture onto the plane of the wind power tower and the foundation, and completely cover the heating tape; after pouring, bury a temperature sensor, and the burial position is 5 - 10 cm away from the heating tape; (4) Lift and install the segment; (5) Install temperature acquisition equipment and a temperature real - time monitoring and control terminal, and use a generator or a civil power line to supply power to the on - site equipment; (6) Through the assistance of the heating tape and real - time monitoring, regulate the temperature change of the grouting connection material.

Images