Wind power grouting material

Abstract

The invention belongs to the technical field of cement-based materials, and particularly discloses a wind power grouting material which comprises the following components in parts by weight: 450-550 parts of quartz sand, 400-420 parts of Portland cement, 20-25 parts of mineral powder, 10-15 parts of silica fume, 15-20 parts of microbead fly ash, 15-20 parts of a CSA expanding agent, 12-18 parts of redispersible rubber powder, 0.2-0.5 part of nano SiO2, 1.5-2.5 parts of a polycarboxylate superplasticizer and 0.1-0.2 part of cellulose ether. The concrete is prepared from the following components in parts by weight: 0.15-0.20 part of a plastic expanding agent, 0.25-0.35 part of a defoaming agent, 0.75-1.0 part of a retarder and 100-115 parts of water. According to the invention, the porosity of the aggregate is reduced by adopting the quartz sand with good grading; the microbead fly ash is added to improve the flowability; gaps of the cementing material are filled with silica fume and nano SiO2, so that the compactness and the cohesiveness of a surrounding structure are improved, and the strength is improved; the CSA expanding agent is added to prevent the material from drying and shrinking; the adhesive property of the material is improved by adding the rubber powder. Therefore, the wind power grouting material disclosed by the invention has excellent comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the technical field of cement-based materials, and in particular relates to a wind power grouting material. Background Art

[0002] Grouting material for wind power is a high-performance composite material specially used for grouting treatment of foundations of large equipment such as wind power. It uses high-quality cement as the main cementing material, ultra-high strength aggregate as the reinforcing material, and is supplemented by high-efficiency water reducer, expansion agent, anti-segregation and other high-performance materials that can increase strength. This material has early strength, ultra-high durability, excellent resistance to chloride ion penetration and frost resistance, and is not easy to crack. It also has good fluidity, pumpability, no water seepage, and convenient construction. Wind power grouting material also has the dual effect of composite expansion, that is, it has micro-expansion performance both in the shaping stage and after hardening, ensuring no shrinkage and no corrosion to steel bars. According to different performance indicators, wind power grouting materials can be divided into categories such as C80, C90, C100, C110, C125, C140, etc., which are mainly used in secondary grouting of foundations of large equipment such as wind power, anchor bolt anchoring grouting, corroded equipment foundations, seismic structures, heavy machinery foundations and other scenes.

[0003] The construction method of wind power grouting material includes ensuring that the foundation surface is clean and free of oil and loose materials, using mechanical mixing and controlling the water-to-material ratio to 11.0%, starting grouting from one side until overflowing on the other side, and watering and curing in time after grouting, and the curing time is not less than 7 days. In addition, wind power grouting material also has high compressive strength, excellent fatigue resistance, no shrinkage, no water seepage, high fluidity, early strength characteristics and micro-expansion characteristics, which together ensure the stability and safety of the wind turbine foundation, improve the stability and safety of wind turbines, and contribute to the development of sustainable energy.

[0004] The use of wind power grouting materials can not only improve the safety and reliability of wind turbines, reduce accidents caused by loose or damaged tower structures, but also increase the service life of wind turbines and reduce maintenance costs. Therefore, wind power grouting materials are a very important material in the wind power industry. Its use can effectively improve the stability and safety of wind turbines and provide strong support for the development of sustainable energy. Summary of the invention

[0005] Based on the good characteristics and application prospects of wind power grouting materials, the purpose of the present invention is to provide a new type of wind power grouting material with excellent comprehensive performance, so as to provide more high-quality choices for the use of wind power grouting materials in the wind power generation industry. The wind power grouting material provided by the present invention has the characteristics of high fluidity, low fluidity loss, high strength, not easy to crack, good bonding performance, etc. The porosity is reduced by improving the aggregate grading, adding a cementitious material that can improve the fluidity, adding a retarder to reduce the fluidity loss rate, adding a CSA expansion agent to compensate for the shrinkage of the material after hardening to prevent cracks, and adding glue powder to improve the bonding performance and bending strength of the material.

[0006] To achieve the above-mentioned purpose, the specific technical solution adopted by the present invention is as follows:

[0007] A wind power grouting material, comprising the following components in parts by weight:

[0008]

[0009] The micro-bead fly ash is an ultra-fine fly ash with a ball effect, which can improve the flowability of the material. The CSA expansion agent is a calcium sulfoaluminate expansion agent made by a special grinding process, which is a clinker specially fired in a rotary kiln with anhydrous calcium sulfoaluminate and calcium oxide as the main minerals, and is added with an appropriate amount of natural hard gypsum; the CSA expansion agent can compensate for the shrinkage of the grouting material after hardening and prevent cracks caused by drying shrinkage. The mixture of the retarder, cellulose ether, redispersible latex powder, defoamer, and plastic expansion agent is added as an admixture, which can ensure that the material does not have early plastic cracking on the basis of meeting the strength and construction performance.

[0010] Preferably, the wind power grouting material comprises the following components in parts by weight:

[0011]

[0012]

[0013] With this formula, the comprehensive performance of wind power grouting materials is better, and it excels in fluidity, fluidity loss, compressive strength, shrinkage rate, and bonding properties.

[0014] Preferably, the quartz sand is composed of 50-150 mesh sand, 40-70 mesh sand and 20-40 mesh sand mixed in a ratio of 1:3:2.

[0015] Preferably, the silicate cement is P.II52.5 silicate cement.

[0016] Preferably, the mineral powder is S105 mineral powder.

[0017] Preferably, the SiO2 content of the silica fume reaches 95%, and the specific surface area can reach 15000m 2 / kg, its particle size is close to nanometer level and can fill the voids in cementitious materials.

[0018] Preferably, the redispersible latex powder is a copolymer of ethylene and vinyl acetate, the compressive strength ratio of the tested mortar is not less than 70%, the tensile bonding strength ratio is not less than 140%, and the resistance to chloride ion penetration is not more than 25%, which can improve the bonding performance of the material.

[0019] Preferably, the nano-SiO2 is a nano-scale material with a size range of 1-100 nm, has extremely strong volcanic ash activity, can improve the strength and toughness of the material, and can fill the gaps between silica ash.

[0020] Preferably, the cellulose ether is a polymer compound with an ether structure made of cellulose, specifically hydroxymethyl cellulose ether, which has water retention, can increase the anti-sagging performance of gypsum self-leveling, and has a viscosity of 400 Pa.s.

[0021] Preferably, the plastic expansion agent is polyurethane, which can generate tiny bubbles in the plastic stage of concrete, so that it has micro-expansion properties.

[0022] Preferably, the water reducer is a polycarboxylic acid high performance water reducer with a water reduction rate ≥ 25%, a 1d compressive strength ratio ≥ 170%, a 3d compressive strength ratio ≥ 160%, and a 28d compressive strength ratio ≥ 140%.

[0023] Preferably, the defoaming agent is an organosilicon defoaming agent, specifically polydimethylsiloxane, the defoaming time should be no more than 60s, and the antifoaming performance should be ≤200S.

[0024] The present invention has the following beneficial effects:

[0025] (1) The wind power grouting material of the present invention adopts quartz sand, which is a mixture of 50-150 mesh sand, 40-70 mesh sand and 20-40 mesh sand in a ratio of 1:3:2, and has a reasonable gradation and low porosity.

[0026] (2) The wind power grouting material of the present invention uses micro-bead fly ash, which is a kind of ultra-fine fly ash. Its particles are in the shape of round glass and have a ball effect, which can improve the flowability of the material.

[0027] (3) The wind power grouting material of the present invention adopts silica fume, which can increase the density of the material and improve the durability of the material such as impermeability.

[0028] (4) The wind power grouting material of the present invention uses a CSA expansion agent, which can compensate for the shrinkage of the material after hardening and is not easy to crack.

[0029] (4) The wind power grouting material of the present invention is added with nano-silicon dioxide to improve the strength of the material.

[0030] (5) The wind power grouting material of the present invention is added with a retarder to reduce the fluidity loss rate of the material.

[0031] In summary, the wind power grouting material of the present invention is green and environmentally friendly, has strong adhesion, small shrinkage, convenient construction, high strength, high fluidity, good water retention and workability, fast strength growth, and can save construction time. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments.

[0033] The raw materials and parameters used in the following examples are as follows:

[0034] Quartz sand: 50-150 mesh sand, 40-70 mesh sand, 20-40 mesh sand are mixed in a ratio of 1:3:2;

[0035] Portland cement: P.II52.5 Portland cement;

[0036] Mineral powder: S105 mineral powder;

[0037] Silica fume: SiO2 content reaches 95%, specific surface area reaches 15000m 2 / kg;

[0038] Redispersible latex powder: a copolymer of ethylene and vinyl acetate, the compressive strength ratio of the tested mortar is not less than 70%, the tensile bond strength ratio is not less than 140%, and the chloride ion penetration resistance is not more than 25%;

[0039] Nano-SiO2: size range is 1-100nm;

[0040] Cellulose ether: hydroxymethyl cellulose ether with a viscosity of 400 Pa.s.

[0041] Plastic expansion agent: polyurethane;

[0042] Water reducing agent: polycarboxylic acid high performance water reducing agent, water reduction rate ≥ 25%, 1d compressive strength ratio ≥ 170%, 3d compressive strength ratio ≥ 160%, 28d compressive strength ratio ≥ 140%;

[0043] Defoaming agent: polydimethylsiloxane, defoaming time is not more than 60s, antifoaming performance is ≤200S.

[0044] In the following examples, the raw materials are mixed and stirred for 1 minute according to the order of aggregate (quartz sand) + cementitious material (Portland cement, mineral powder, silica fume, microbead fly ash), and then the admixtures (CSA expansion agent, redispersible rubber powder, nano-SiO2, polycarboxylic acid water reducer, cellulose ether, plastic expansion agent, defoaming agent, retarder) are added in sequence, stirred for 5-8 minutes, and then water is added and stirred for 3-5 minutes to obtain the wind power grouting material.

[0045] Example 1

[0046] The wind power grouting material of this embodiment includes the following components in parts by weight:

[0047] Example 2

[0048] The wind power grouting material of this embodiment includes the following components in parts by weight:

[0049]

[0050]

[0051] Example 3

[0052] The wind power grouting material of this embodiment includes the following components in parts by weight:

[0053] Example 4

[0054] The wind power grouting material of this embodiment includes the following components in parts by weight:

[0055]

[0056]

[0057] Example 5

[0058] The wind power grouting material of this embodiment includes the following components in parts by weight:

[0059] The components and contents of the wind power grouting materials in various embodiments are summarized in Table 1 below:

[0060] Table 1

[0061]

[0062]

[0063] The physical property test results of the wind power grouting materials of various embodiments are shown in Table 2 below:

[0064] Table 2

[0065] Test Project Example 1 Example 2 Example 3 Example 4 Example 5 Technical requirements Initial fluidity (mm) 325 345 360 365 360 ≥340 Fluidity after 1h (mm) 250 260 265 290 320 ≥260 28d compressive strength (Mpa) 105 117 129 133 147 ≥140 Bond strength(Mpa) 1.2 1.4 1.6 1.6 1.7 ≥1.5 Drying shrinkage (%) -0.036 -0.018 -0.012 +0.015 +0.030 ≤0.05、≥0

[0066] As can be seen from Table 2, in Example 1, no CSA expansion agent, nano-silicon dioxide, micro-bead fly ash and redispersible rubber powder are added, and the strength of the material is low, the fluidity loss is fast, and shrinkage will occur after hardening; in Example 2, micro-bead fly ash, CSA expansion agent and redispersible rubber powder are added, and the fluidity of the material is improved, the compressive strength and bonding strength are improved, and the drying shrinkage rate is reduced; in Example 3, when the micro-bead fly ash is added in an amount of 15 parts, the fluidity of the material is greatly increased, and when the redispersible latex powder is added in an amount of 15 parts, the bonding strength reaches 1.6MPa; in Example 4, when the CSA expansion agent is added in an amount of 20 parts, the drying shrinkage rate of the material is positive, that is, the material also has expansion properties after hardening, and it is not easy to produce drying shrinkage cracks; the test data of Example 5 show that when the nano-silicon dioxide is added in an amount of 0.5 parts, the compressive strength of the material is greatly improved, exceeding 140MPa, and when the retarder tartaric acid is added in an amount of 0.75 parts, the fluidity loss of the material is greatly reduced. Examples 4 and 5 belong to the formulations within the protection scope of the present invention, and have better comprehensive performance than the three comparative examples 1-3, and Example 5 has the best performance.

[0067] This specific implementation is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wind power grouting material, characterized in that: It includes the following components in parts by weight:

2. The wind power grouting material according to claim 1, characterized in that: The quartz sand is composed of 50-150 mesh sand, 40-70 mesh sand and 20-40 mesh sand mixed in a ratio of 1:3:

2.

3. The wind power grouting material according to claim 1, characterized in that: The silicate cement is P.II52.5 silicate cement; the mineral powder is S105 mineral powder.

4. The wind power grouting material according to claim 1, characterized in that: The SiO2 content of the silica fume reaches 95% and the specific surface area reaches 15000m 2 / kg.

5. The wind power grouting material according to claim 1, characterized in that: The redispersible latex powder is a copolymer of ethylene and vinyl acetate, and the compressive strength ratio of the tested mortar is not less than 70%, the tensile bonding strength ratio is not less than 140%, and the chloride ion penetration resistance is not more than 25%.

6. The wind power grouting material according to claim 1, characterized in that: The size of the nano-SiO2 is in the range of 1-100 nm.

7. The wind power grouting material according to claim 1, characterized in that: The cellulose ether is hydroxymethyl cellulose ether, and the viscosity is 400 Pa.s.

8. The wind power grouting material according to claim 1, characterized in that: The plastic expansion agent is polyurethane.

9. The wind power grouting material according to claim 1, characterized in that: The polycarboxylate water reducer has a water reduction rate of ≥25%, a 1d compressive strength ratio of ≥170%, a 3d compressive strength ratio of ≥160%, and a 28d compressive strength ratio of ≥140%.

10. The wind power grouting material according to claim 1, characterized in that: The defoaming agent is an organosilicon defoaming agent, specifically polydimethylsiloxane, the defoaming time should be no more than 60s, and the antifoaming performance is ≤200S.

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