A two-component antifreeze early-strength slurry and its preparation method and application

Abstract

The present application relates to the technical field of cement mortar compositions, and specifically discloses a two-component antifreeze and early-strength slurry, its preparation method, and application. The two-component antifreeze and early-strength slurry provided in the present application is composed of component A and component B in a weight ratio of 25:4-10; component A is composed of: 250-280 parts of Portland cement, 90-100 parts of admixture, 145-165 parts of sand, and 6.4-8.4 parts of water reducer; component B is composed of: 8-10 parts of sodium nitrite antifreeze agent, 50-58 parts of reinforcing agent, 32-40 parts of anhydrite, 240-270 parts of admixture, 155-175 parts of sand, and 4.1-6.1 parts of water reducer. Using the above technical solution, the two-component antifreeze and early-strength slurry prepared has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultra-low temperature conditions.

Description

Technical Field

[0001] The present application relates to the technical field of cement mortar compositions, and in particular to a two-component frost-resistant and early-strength slurry, and a preparation method and application thereof. Background Art

[0002] Currently, the minimum operating temperature of most wind power construction slurries on the market is only -5°C. When the ambient temperature drops to -15°C, freezing is likely to occur and the slurries have almost no strength in the early stages, making them unable to meet construction requirements. In some areas, the temperature difference between day and night is large, with the highest and lowest temperatures differing by 30°C. During a day's construction, it is necessary to frequently replace normal temperature and negative temperature materials to cope with temperature changes, which significantly increases the workload and leads to low construction efficiency.

[0003] Currently, some existing technologies use Portland cement, fly ash, composite antifreeze agents, and water reducers to produce frost-resistant concrete compositions, achieving a 28-day compressive strength of 60 MPa under freeze-thaw cycles. Others use 42.5-grade Portland cement, fly ash, composite antifreeze agents, and water reducers to produce frost-resistant concrete, achieving frost resistance grades between F150 and F200. Some use ordinary Portland cement, composite early-strength antifreeze agents, and strong fibers to produce early-strength frost-resistant concrete, achieving compressive strength ratios exceeding 105%. All of these technologies involve the preparation of frost-resistant concrete, but their applicable temperature ranges are narrow, with each mix ratio corresponding to only one operating temperature. This lacks flexibility in adapting to changes in construction temperatures, and in extremely negative temperatures (-15°C) results in almost no early strength and slow strength development in later stages. Summary of the Invention

[0004] In order to address the deficiencies in the prior art, the present application provides a two-component antifreeze and early-strength slurry, a preparation method thereof, and an application thereof.

[0005] In a first aspect, the present application provides a two-component antifreeze early strength slurry, consisting of component A and component B in a weight ratio of 250:40-100;

[0006] Wherein, the A component is made of the following raw materials in parts by weight: 250-280 parts of Portland cement, 90-100 parts of admixture, 145-165 parts of sand, and 6.4-8.4 parts of water reducer;

[0007] In the A component, the admixture is composed of mineral powder and fly ash in a weight ratio of 10:17-25;

[0008] The B component is made of the following raw materials in parts by weight: 8-10 parts of sodium nitrite antifreeze agent, 50-58 parts of reinforcing additive, 32-40 parts of anhydrite, 240-270 parts of admixture, 155-175 parts of sand, and 4.1-6.1 parts of water reducer;

[0009] In the B component, the admixture is composed of mineral powder and silica fume in a weight ratio of 10:15-23; the reinforcing additive is composed of a mixture of oleic acid amine and tricalcium aluminate in a weight ratio of 1:20-30.

[0010] This application develops a two-component, frost-resistant, early-strengthening, high-performance slurry specifically for wind turbines. By adding component B to component A, it can be converted from a normal-temperature type to a low-temperature type. This can meet the performance requirements of strength and operability in different negative temperature environments, and can still meet the continuous development of compressive strength in ultra-low temperature environments of -15°C. The two-component, frost-resistant, early-strengthening, high-performance slurry specifically for wind turbines provided by this application can flexibly respond to temperature changes in the construction environment, avoiding the need for frequent material replacement during construction, reducing workload, and improving construction efficiency.

[0011] Sodium nitrite, as an antifreeze agent in the slurry, can effectively lower the slurry's freezing point, thereby improving its antifreeze properties. In cold environments, water in the slurry easily freezes, causing volume expansion and structural damage. The addition of sodium nitrite can lower the slurry's freezing point, allowing it to maintain fluidity even in low-temperature conditions, preventing damage caused by freezing. Secondly, sodium nitrite also has the effect of promoting early strength. Adding an appropriate amount of sodium nitrite to the slurry can accelerate the cement hydration reaction, thereby shortening the slurry's hardening time and improving its early strength.

[0012] The tricalcium aluminate in the reinforcing agent, with its fast-hardening and early-strengthening properties, can accelerate hydration, generating a large amount of hydration heat, thereby accelerating the hardening process of the slurry and improving the early strength of the slurry under low-temperature conditions. At the same time, tricalcium aluminate can prevent the slurry from freezing. Oleic acid amine can reduce the surface tension of the slurry and improve the fluidity of the slurry in low-temperature environments, ensuring that the antifreeze agent can effectively lower the freezing point of the slurry, allowing it to maintain good fluidity and workability in cold conditions. Oleic acid amine also has good antifreeze properties. Adding an appropriate amount of oleic acid amine to the slurry can effectively lower its freezing point, preventing the slurry from freezing and expanding at low temperatures, thereby maintaining the stability and fluidity of the slurry. In addition, oleic acid amine can also promote the early strength of the slurry. It can chemically react with other components in the slurry to produce more hydration products, thereby accelerating the hardening process of the slurry. This allows the slurry to achieve higher strength in a short period of time, improving construction efficiency and shortening the construction period. The amine oleate compound, combined with tricalcium aluminate to form a reinforcing additive, creates a beneficial synergistic effect within the slurry. The wetting and penetration of the amine oleate facilitates the full hydration of the tricalcium aluminate, while the early strength properties of the tricalcium aluminate further enhance the overall performance of the slurry. This synergistic effect results in excellent frost resistance and early strength performance in the slurry, meeting the high-performance requirements of complex construction environments.

[0013] Preferably, the two-component antifreeze and early-strength slurry consists of component A and component B in a weight ratio of 25:4-10.

[0014] In a specific embodiment, in the two-component antifreeze and early-strength slurry, the weight ratio of component A to component B can be 25:4, 25:6, 25:7, 25:8, or 25:10.

[0015] Preferably, in the component A and the component B, the sand is composed of 10-20 mesh continuous graded machine-made sand and 20-40 mesh continuous graded machine-made sand in a weight ratio of 0.5-1.5:0.5-1.5; and the water reducer is a polycarboxylic acid superplasticizer.

[0016] Preferably, in the admixture of component A, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , with a specific surface area of 825-925m 2 / kg, active ingredient ≥85%, 3d activity index ≥80%, 28d activity index ≥95%; the fly ash has a 45μm square hole sieve residue of ≤30%, a fluidity ratio ≥95%, a 3d activity index ≥50%, and a 28d activity index ≥65%.

[0017] Preferably, in the admixture of component B, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , with a specific surface area of 825-925m 2 / kg, active ingredient ≥85%, 3d activity index ≥80%, 28d activity index ≥95%; the performance parameters of the silica fume are bulk density ≤350kg / m 3 , specific surface area 26000-28000m 2 / kg, silica content ≥90%, 7d activity index ≥105%, 28d activity index ≥115%, water requirement ratio ≤125%.

[0018] Preferably, the performance parameters of the tricalcium aluminate in the reinforcing additive of component B are: density 2.98-3.18 g / cm 3 , free calcium oxide content ≤ 0.1%, tricalcium aluminate content ≥ 98%;

[0019] The preparation method of tricalcium aluminate is as follows: ball-milled and sieved CaCO3 and Al2O3 are mixed and stirred at a molar ratio of 2.9-3.1:1 for 4-6 hours to obtain a solid material, and then 10% distilled water is added and fully stirred. The prepared sample is placed in an oven and dried to a constant weight at a pressure of 60-80 kN for 25-40 seconds. The sample is then calcined at 1250-1350° C. for 5-8 hours, and the process is repeated 2-3 times to obtain the solid material.

[0020] Preferably, in the reinforcing auxiliary agent of component B, the oleic acid amine substance is selected from one or more of triethanolamine oleate, ethanolamine oleate, and ethylenediamine oleate.

[0021] Preferably, in the component B, the reinforcing agent is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:23-27.

[0022] In a specific embodiment, in the reinforcing agent, the weight ratio of ethanolamine oleate to tricalcium aluminate can be 1:20, 1:23, 1:25, 1:27, or 1:30.

[0023] Through experimental analysis, it can be known that the present application utilizes the above-mentioned weight ratio of ethanolamine oleate and tricalcium aluminate to mix and form a reinforcing additive, which further improves the performance of the two-component antifreeze and early strength slurry.

[0024] In a second aspect, the present application provides a method for preparing the above-mentioned two-component antifreeze early strength slurry, which specifically comprises the following steps:

[0025] According to the formula, the corresponding weight portions of each raw material component are weighed to obtain component A and component B;

[0026] Component A and component B are pre-mixed according to the ratio, and the pre-mixing time is 2-3 minutes to obtain a pre-mixed material;

[0027] Water is added to the premix according to a water-solid ratio of 0.085-0.095, and the mixture is stirred for 3-5 minutes to prepare a two-component antifreeze and early strength slurry.

[0028] In a third aspect, the present application provides the application of the above-mentioned two-component antifreeze and early-strength slurry in concrete for wind power generation construction.

[0029] In summary, the technical solution of this application has the following effects:

[0030] The two-component, frost-resistant, early-strengthening, high-performance slurry specifically designed for wind turbines developed in this application, by incorporating component B into component A, can meet the performance requirements of strength and operability time in different negative temperature environments, and can still meet the continuous development of compressive strength in ultra-low temperature environments of -15°C. The two-component, frost-resistant, early-strengthening, high-performance slurry specifically designed for wind turbines provided in this application can flexibly respond to temperature changes in the construction environment, avoiding the need for frequent material replacement during construction, reducing workload, and improving construction efficiency. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with examples, comparative examples and performance testing experiments. These examples should not be construed as limiting the scope of protection claimed in this application.

[0032] In component A and component B, the sand is composed of 10-20 mesh continuous graded machine-made sand and 20-40 mesh continuous graded machine-made sand in a weight ratio of 1::1; the water reducer is a polycarboxylic acid superplasticizer.

[0033] In the admixture of component A, the apparent density of the mineral powder is 2.88g / cm 3 , with a specific surface area of 875m 2 / kg, active ingredient 90.3%, 3d activity index 83%, 28d activity index 97%; fly ash residue passing 45μm square hole sieve is 21%, fluidity ratio 96%, 3d activity index 58%, 28d activity index 68%.

[0034] In the admixture of component B, the apparent density of the mineral powder is 2.88g / cm 3 , with a specific surface area of 875m 2 / kg, active ingredient 90.3%, 3d activity index 83%, 28d activity index 97%; the performance parameters of silica fume are: bulk density 320kg / m 3 , specific surface area 27000m 2 / kg, silica content 95%, 7d activity index 112%, 28d activity index 120%, water requirement ratio 103%. Example Example 1

[0035] Example 1 provides a two-component antifreeze and early-strength slurry and a preparation method thereof.

[0036] The preparation method of the two-component antifreeze and early-strength slurry in Example 1 is as follows:

[0037] Component A: Weigh 265 g of PO42.5 silicate cement, 95 g of admixture (composed of mineral powder and fly ash in a weight ratio of 10:21), 155 g of sand, and 7.4 g of water reducer, mix well, and obtain component A.

[0038] Component B: Weigh 9 g of sodium nitrite antifreeze, 54 g of reinforcing agent (composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:25), 36 g of anhydrite, 255 g of admixture (composed of mineral powder and silica fume in a weight ratio of 10:19), 165 g of sand, and 5.1 g of water reducer, mix well to obtain component B.

[0039] Among them, the performance parameters of tricalcium aluminate are: density 3.08g / cm 3 , free calcium oxide content is 0.06%, tricalcium aluminate content is 98.8%; the preparation method of tricalcium aluminate is:

[0040] The CaCO3 and Al2O3 raw materials were fully ground using a ball mill and then passed through a 45μm square hole sieve. The sieved CaCO3 and Al2O3 were placed in a mixer at a molar ratio of 3:1 and evenly mixed for 5 hours; 200g of the mixed raw materials were weighed, 10% distilled water was added and stirred for 10 minutes, then placed in a mold with a diameter of 120mm, and a pressure of 75kN was maintained for 30 seconds. The prepared sample was placed in an oven and dried to constant weight; finally, the sample was placed in a rapid heating silicon molybdenum rod resistance furnace and fired at a high temperature of 1300℃ for 6 hours, and repeated twice.

[0041] Component A and component B were pre-mixed in a weight ratio of 250:80 for 3 minutes to obtain a pre-mixed material; water was added to the pre-mixed material at a water-solid ratio of 0.09, and the mixture was stirred for 4 minutes to prepare a two-component antifreeze and early-strength slurry.

[0042] Examples 2-5

[0043] Examples 2-5 respectively provide a two-component antifreeze early strength slurry and a preparation method thereof.

[0044] The difference between the above embodiment and embodiment 1 is that the amounts of the components in component B are different, as shown in Table 1.

[0045] Table 1 Amount of each component in component B in Examples 1-5

[0046]

[0047] The other process parameters in the above embodiment are the same as those in Example 1.

[0048] Examples 6-9

[0049] Examples 6-9 respectively provide a two-component antifreeze early strength slurry and a preparation method thereof.

[0050] The difference between the above embodiment and embodiment 1 is that the admixtures in component A and component B are different, as shown below.

[0051] In Example 6: the admixture in component A consists of mineral powder and fly ash in a weight ratio of 10:17.

[0052] In Example 7: the admixture in component A consists of mineral powder and fly ash in a weight ratio of 10:25.

[0053] In Example 8: the B component admixture consists of mineral powder and silica fume in a weight ratio of 10:15.

[0054] In Example 9: the B component admixture consists of mineral powder and silica fume in a weight ratio of 10:23.

[0055] The other process parameters in the above embodiment are the same as those in Example 1.

[0056] Examples 10-14

[0057] Examples 10-14 respectively provide a two-component antifreeze early strength slurry and a preparation method thereof.

[0058] The difference between the above embodiment and embodiment 1 is that the reinforcing agent in component B is different, as shown below.

[0059] In Example 10, the reinforcing agent in component B is composed of a mixture of triethanolamine oleate and tricalcium aluminate in a weight ratio of 1:25.

[0060] In Example 11, the reinforcing agent in component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:20.

[0061] In Example 12, the reinforcing agent in component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:30.

[0062] In Example 13, the reinforcing agent in component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:23.

[0063] In Example 14, the reinforcing agent in component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 1:27.

[0064] The other process parameters in the above embodiment are the same as those in Example 1.

[0065] Examples 15-17

[0066] Examples 15-17 respectively provide a two-component antifreeze early strength slurry and a preparation method thereof.

[0067] The difference between the above embodiment and embodiment 1 is that the weight ratio of component A to component B is different, as shown below.

[0068] In Example 15, the weight ratio of component A to component B is 250:40.

[0069] In Example 16, the weight ratio of component A to component B is 250:60.

[0070] In Example 17, the weight ratio of component A to component B is 250:100.

[0071] The other process parameters in the above embodiment are the same as those in Example 1. Comparative Example

[0072] Comparative Examples 1-5

[0073] Comparative Examples 1-5 respectively provide a two-component antifreeze early strength slurry and a preparation method thereof.

[0074] The differences between the comparative example and Example 1 are specifically as follows.

[0075] In Comparative Example 1: Component A: 265 g of PO42.5 silicate cement, 255 g of admixture, 155 g of sand, and 7.4 g of water reducer were weighed respectively, and mixed evenly to obtain component A; Component B: 9 g of sodium nitrite antifreeze agent, 54 g of reinforcing agent, 36 g of anhydrite, 95 g of admixture, 165 g of sand, and 5.1 g of water reducer were weighed respectively, and mixed evenly to obtain component B.

[0076] In Comparative Example 2: the antifreeze agent in component B is an equal amount of triethanolamine instead of sodium nitrite.

[0077] In Comparative Example 3, the amount of sodium nitrite antifreeze in component B is 4 g, and the amount of reinforcing agent is 70 g.

[0078] In Comparative Example 4: the reinforcing agent in component B is composed of a mixture of ethanolamine and tricalcium aluminate in a weight ratio of 1:27.

[0079] In Comparative Example 5, the reinforcing agent in component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate in a weight ratio of 27:1.

[0080] The other process parameters in the above comparative example are the same as those in Example 1.

[0081] Performance testing

[0082] The two-component frost-resistant and early-strength wind turbine special seat slurry prepared in the embodiment and the comparative example was molded into test pieces at 0°C and -15°C, respectively, according to the method provided in GB / T17671-2021 "Test method for strength of cement mortar (ISO method)", and cured at 0°C and -15°C, respectively, and then the compressive strength performance of the molded test pieces was tested.

[0083] Test results: as shown in Table 2.

[0084] Table 2 Performance test results of the two-component antifreeze and early strength slurry prepared in the examples and comparative examples

[0085]

[0086] Combined with the performance test results in the above table, it can be seen that the amount of admixtures of component A and component B in comparative example 1 is not matched, the antifreeze agent in component B in comparative example 2 is an equal amount of triethanolamine instead of sodium nitrite; the amount of sodium nitrite antifreeze agent in component B in comparative example 3 is 4g, and the amount of reinforcing agent is 70g; the reinforcing agent in component B in comparative example 4 is composed of a mixture of ethanolamine and tricalcium aluminate in a weight ratio of 1:27; the reinforcing agent in component B in comparative example 5 is composed of a mixture of oleylethanolamine and tricalcium aluminate in a weight ratio of 27:1. The performance of the slurries prepared in the above comparative examples is poor and cannot meet the development requirements of compressive strength under different negative temperature conditions. In contrast, the two-component antifreeze and early-strength slurry prepared using the technical solution provided in the embodiment of the present application has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultra-low temperature conditions. The above results indicate that the two-component antifreeze and early-strength slurry provided in this application can flexibly respond to temperature changes in the construction environment, avoid frequent material replacement during construction, reduce workload, and improve construction efficiency.

[0087] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A two-component antifreeze early strength slurry, characterized in that: It is composed of component A and component B in a weight ratio of 25:6-8; Wherein, the A component is made of the following raw materials in parts by weight: 250-280 parts of Portland cement, 90-100 parts of admixture, 145-165 parts of sand, and 6.4-8.4 parts of water reducer; In the A component, the admixture is composed of mineral powder and fly ash in a weight ratio of 10:17-25; The B component is made of the following raw materials in parts by weight: 8-10 parts of sodium nitrite antifreeze agent, 50-58 parts of reinforcing additive, 32-40 parts of anhydrite, 240-270 parts of admixture, 155-175 parts of sand, and 4.1-6.1 parts of water reducer; In the B component, the admixture is composed of mineral powder and silica fume in a weight ratio of 10:15-23; the reinforcing agent is composed of a mixture of oleic acid ethanolamine and tricalcium aluminate in a weight ratio of 1:23-27; The performance parameters of tricalcium aluminate are: density 2.98-3.18g / cm 3 , free calcium oxide content ≤0.1%, tricalcium aluminate content ≥98%; the preparation method of the tricalcium aluminate is: mixing the ball-milled and sieved CaCO3 and Al2O3 at a molar ratio of 2.9-3.1:1 for 4-6 hours to obtain a solid material, then adding 10% distilled water and fully stirring, maintaining the pressure at 60-80kN for 25-40s, placing the prepared sample in an oven and drying it to constant weight; then calcining the sample at 1250-1350℃ for 5-8 hours, and repeating this process 2-3 times to obtain the product.

2. The two-component antifreeze early strength slurry according to claim 1, characterized in that: In the components A and B, the sands are composed of 10-20 mesh continuous graded machine-made sand and 20-40 mesh continuous graded machine-made sand in a weight ratio of 0.5-1.5:0.5-1.5; and the water reducers are all polycarboxylic acid superplasticizers.

3. The two-component antifreeze early strength slurry according to claim 1, characterized in that: In the admixture of component A, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , with a specific surface area of 825-925m 2 / kg, active ingredient ≥85%, 3d activity index ≥80%, 28d activity index ≥95%; the fly ash has a 45μm square hole sieve residue of ≤30%, a fluidity ratio ≥95%, a 3d activity index ≥50%, and a 28d activity index ≥65%.

4. The two-component antifreeze early strength slurry according to claim 1, characterized in that: In the admixture of component B, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , with a specific surface area of 825-925m 2 / kg, active ingredient ≥85%, 3d activity index ≥80%, 28d activity index ≥95%; the performance parameters of the silica fume are bulk density ≤350kg / m 3 , specific surface area 26000-28000m 2 / kg, silica content ≥90%, 7d activity index ≥105%, 28d activity index ≥115%, water requirement ratio ≤125%.

5. A method for preparing the two-component antifreeze early strength slurry according to any one of claims 1 to 4, characterized in that: The specific steps include: According to the formula, the corresponding weight portions of each raw material component are weighed to obtain component A and component B; Component A and component B are pre-mixed according to the ratio, and the pre-mixing time is 2-3 minutes to obtain a pre-mixed material; Water is added to the premix according to a water-solid ratio of 0.085-0.095, and the mixture is stirred for 3-5 minutes to prepare a two-component antifreeze and early strength slurry.

6. Use of the two-component antifreeze and early-strength slurry according to any one of claims 1 to 4 in concrete for wind power generation construction.

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