Two-component anti-freezing early-strength slurry as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cement mortar compositions, and particularly discloses a double-component anti-freezing early-strength slurry and a preparation method and application thereof. The double-component anti-freezing early-strength slurry provided by the invention is composed of a component A and a component B in a weight ratio of 25: (4-10), the component A is prepared from the following components in parts by weight: 250 to 280 parts of Portland cement, 90 to 100 parts of admixture, 145 to 165 parts of sand and 6.4 to 8.4 parts of water reducing agent; and the component B comprises the following components in parts by weight: 8-10 parts of a sodium nitrite antifreeze agent, 50-58 parts of a reinforcing aid, 32-40 parts of anhydrite, 240-270 parts of an admixture, 155-175 parts of sand and 4.1-6.1 parts of a water reducing agent. By utilizing the technical scheme, the prepared double-component anti-freezing early-strength slurry has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultralow temperature conditions.

Description

Technical Field

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

[0002] Currently, the minimum use temperature of most of the base slurries for wind power generation construction on the market is only -5°C. When the ambient temperature drops to -15°C, freezing is likely to occur and there is almost no strength in the early stage, which cannot meet the construction requirements; in some areas, the temperature difference between day and night is relatively large, and the maximum and minimum temperatures can differ by 30°C. During the construction process of a day, it is necessary to frequently replace normal-temperature and negative-temperature materials to cope with temperature changes, significantly increasing the workload and resulting in low construction efficiency.

[0003] Currently, in the prior art, some have prepared frost-resistant concrete compositions using portland cement, fly ash, composite antifreeze agents, and water reducers, with a 28-day compressive strength of 60 MPa under freeze-thaw cycle conditions; some have prepared frost-resistant concrete using 42.5-grade portland cement, fly ash, composite antifreeze agents, and water reducers, with a frost resistance grade between F150 and F200; some have prepared early-strength and frost-resistant concrete using ordinary portland cement, composite early-strength antifreeze agents, strong fibers, etc., with a compressive strength ratio greater than 105%. The above technologies all involve the preparation of frost-resistant concrete, but the applicable temperature range is relatively narrow, and one formulation only corresponds to one use temperature, unable to flexibly cope with changes in the construction environment temperature, and there is almost no strength in the early stage under ultra-low temperature (-15°C) conditions, and the strength development is slow in the later stage. Summary of the Invention

[0004] In order to solve the deficiencies in the prior art, the present application provides a two-component frost-resistant and early-strength slurry and its preparation method and application.

[0005] In the first aspect, the present application provides a two-component frost-resistant and early-strength slurry, which is composed of component A and component B with a weight ratio of 250:40 - 100; Among them, component A is made from 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 component A, the admixture is composed of blast furnace slag powder and fly ash with a weight ratio of 10:17 - 25; Component B is made from the following raw materials in parts by weight: 8 - 10 parts of sodium nitrite antifreeze agent, 50 - 58 parts of strengthening auxiliary 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; In the B component, the admixture is composed of ground granulated blast-furnace slag and silica fume with a weight ratio of 10:15 - 23; the strengthening aid is composed of oleic acid amide substance and tricalcium aluminate with a weight ratio of 1:20 - 30.

[0006] This application develops a two-component anti-freezing and early-strength high-performance seat grout for wind power generation. By incorporating the B component into the A component, the normal-temperature type can be changed to the low-temperature type, which can meet the performance requirements of strength and workable time in different negative-temperature environments, and can still meet the continuous development of compressive strength in an ultra-low temperature environment of -15°C. The two-component anti-freezing and early-strength high-performance seat grout provided by this application can flexibly respond to the temperature change of the construction environment, avoid the situation of frequently replacing materials during the construction process, reduce the workload, and improve the construction efficiency.

[0007] Sodium nitrite, as an anti-freezing agent in the grout, can effectively lower the freezing point of the grout, thereby improving its anti-freezing performance; in a cold environment, the water in the grout is prone to freezing, resulting in volume expansion and structural damage, while the addition of sodium nitrite can lower the freezing point of the grout, enabling it to maintain fluidity even under low-temperature conditions and 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 grout can accelerate the hydration reaction of cement, thereby shortening the hardening time of the grout and improving its early strength.

[0008] Tricalcium aluminate in the strengthening aid can play a role in accelerating hydration with its characteristics of rapid hardening and early strength, generating a large amount of hydration heat, thereby accelerating the hardening process of the grout and further enhancing the early strength of the grout under low-temperature conditions; at the same time, tricalcium aluminate can prevent the grout from being frozen. The oleic acid amide substance can reduce the surface tension of the grout, improve the fluidity of the grout in a low-temperature environment, ensure that the anti-freezing agent can effectively lower the freezing point of the grout, and enable it to maintain good fluidity and workability under cold conditions; moreover, the oleic acid amide substance also has good anti-freezing performance. Adding an appropriate amount of oleic acid amide to the grout can effectively lower its freezing point, prevent the grout from freezing and expanding at low temperature, thereby maintaining the stability and fluidity of the grout; in addition, the oleic acid amide substance can also promote the early-strength performance of the grout. It can chemically react with other components in the grout to generate more hydration products, thereby accelerating the hardening process of the grout, which enables the grout to reach a relatively high strength in a short time, improves the construction efficiency, and shortens the construction period. The oleic acid amide substance and tricalcium aluminate are mixed to form a strengthening aid, which forms a beneficial synergistic effect in the grout. The wetting and penetration effects of the oleic acid amide provide favorable conditions for the full hydration of tricalcium aluminate, and the early-strength characteristics of tricalcium aluminate further enhance the overall performance of the grout. This synergistic effect makes the grout perform excellently in terms of anti-freezing and early strength, meeting the high-performance requirements in complex construction environments.

[0009] Preferably, the two-component anti-freezing and early-strength slurry is composed of component A and component B with a weight ratio of 25:4-10.

[0010] In a specific embodiment, in the two-component anti-freezing and early-strength slurry, the weight ratio of component A to component B can be 25:4, 25:6, 25:7, 25:8, 25:10.

[0011] Preferably, in component A and component B, the sand is composed of 10-20 mesh continuously graded machine-made sand and 20-40 mesh continuously graded machine-made sand with a weight ratio of 0.5-1.5:0.5-1.5; the water reducer is a polycarboxylate superplasticizer.

[0012] Preferably, in the admixture of component A, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , the specific surface area is 825-925 m 2 / kg, the active ingredient ≥ 85%, the 3d activity index ≥ 80%, the 28d activity index ≥ 95%; the residue on the 45μm square hole sieve of the fly ash ≤ 30%, the fluidity ratio ≥ 95%, the 3d activity index ≥ 50%, the 28d activity index ≥ 65%.

[0013] Preferably, in the admixture of component B, the apparent density of the mineral powder is 2.78-2.98 g / cm 3 , the specific surface area is 825-925 m 2 / kg, the active ingredient ≥ 85%, the 3d activity index ≥ 80%, the 28d activity index ≥ 95%; the performance parameters of the silica fume are the bulk density ≤ 350 kg / m 3 , the specific surface area 26000-28000 m 2 / kg, the silicon dioxide content ≥ 90%, the 7d activity index ≥ 105%, the 28d activity index ≥ 115%, the water demand ratio ≤ 125%.

[0014] Preferably, in the strengthening auxiliary agent of component B, the performance parameters of tricalcium aluminate are: density 2.98-3.18 g / cm 3 , the free calcium oxide content ≤ 0.1%, the tricalcium aluminate content ≥ 98%; The preparation method of the tricalcium aluminate is: mixing and stirring the ball-milled and sieved CaCO3 and Al2O3 at a molar ratio of 2.9-3.1:1 for 4-6 h to obtain a solid material, then adding 10% distilled water and stirring thoroughly, keeping the pressure at 60-80 kN for 25-40 s, putting the prepared sample into an oven and drying it to a constant weight; then firing the sample at 1250-1350 °C for 5-8 h, repeating 2-3 times, and that is obtained.

[0015] Preferably, among the reinforcing aids of component B, the oleic acid amine substance is selected from one or more of triethanolamine oleate, ethanolamine oleate, and ethylenediamine oleate.

[0016] Preferably, in component B, the reinforcing aid is composed of a mixture of ethanolamine oleate and tricalcium aluminate with a weight ratio of 1:23 - 27.

[0017] In a specific embodiment, in the reinforcing aid, the weight ratio of ethanolamine oleate to tricalcium aluminate can be 1:20, 1:23, 1:25, 1:27, or 1:30.

[0018] Through experimental analysis, it can be known that in this application, a reinforcing aid composed of a mixture of ethanolamine oleate and tricalcium aluminate with the above weight ratio is used, further improving the performance of the two-component anti-freezing and early-strength slurry.

[0019] Second, this application provides a preparation method for the above two-component anti-freezing and early-strength slurry, which specifically includes the following steps: According to the formula, weigh the corresponding weight portions of each raw material component respectively to obtain component A and component B; Pre-mix component A and component B according to the ratio, and the pre-mixing time is 2 - 3 min to obtain a premix; According to a water-solid ratio of 0.085 - 0.095, add water to the premix and stir and mix for 3 - 5 min to prepare the two-component anti-freezing and early-strength slurry.

[0020] Third, this application provides the application of the above two-component anti-freezing and early-strength slurry in concrete for wind power generation construction.

[0021] In summary, the technical solution of this application has the following effects: The two-component anti-freezing and early-strength high-performance seat slurry developed in this application can meet the performance requirements of strength and workable time in different negative temperature environments by incorporating component B into component A, and can still meet the continuous development of compressive strength in an ultra-low temperature environment of -15°C. The two-component anti-freezing and early-strength high-performance seat slurry provided by this application can flexibly respond to temperature changes in the construction environment, avoid the situation of frequently replacing materials during construction, reduce the workload, and improve the construction efficiency. Detailed Embodiments

[0022] The following further describes this application in detail in combination with examples, comparative examples, and performance detection tests. These examples should not be construed as limiting the scope claimed in this application.

[0023] In component A and component B, the sand is composed of continuously graded manufactured sand with a particle size of 10 - 20 mesh and continuously graded manufactured sand with a particle size of 20 - 40 mesh at a weight ratio of 1:1; the water reducing agent is a polycarboxylate superplasticizer.

[0024] Among the admixtures of Component A, the apparent density of the mineral powder is 2.88 g / cm 3 , the specific surface area is 875 m 2 / kg, the active ingredient is 90.3%, the 3-day activity index is 83%, and the 28-day activity index is 97%; the residue on the 45-μm square-hole sieve of the fly ash is 21%, the fluidity ratio is 96%, the 3-day activity index is 58%, and the 28-day activity index is 68%.

[0025] Among the admixtures of Component B, the apparent density of the mineral powder is 2.88 g / cm 3 , the specific surface area is 875 m 2 / kg, the active ingredient is 90.3%, the 3-day activity index is 83%, and the 28-day activity index is 97%; the performance parameters of the silica fume are: bulk density 320 kg / m 3 , specific surface area 27000 m 2 / kg, silica content 95%, 7-day activity index 112%, 28-day activity index 120%, water demand ratio 103%. Examples Example 1

[0026] Example 1 provides a two-component frost-resistant and early-strength slurry and a preparation method thereof.

[0027] The preparation method of the two-component frost-resistant and early-strength slurry in Example 1 is as follows: Component A: Weigh 265 g of PO42.5 portland 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 respectively, and mix them evenly to obtain Component A.

[0028] Component B: Weigh 9 g of sodium nitrite antifreeze agent, 54 g of enhancing auxiliary agent (composed of oleic acid ethanolamine 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 respectively, and mix them evenly to obtain Component B.

[0029] Among them, the performance parameters of tricalcium aluminate are: density 3.08 g / cm 3 , free calcium oxide content 0.06%, tricalcium aluminate content 98.8%; the preparation method of tricalcium aluminate is: The CaCO3 and Al2O3 raw materials were ground thoroughly with a ball mill and then passed through a 45-μm square-hole sieve. The sieved CaCO3 and Al2O3 were put into a mixer and uniformly mixed for 5 h at a molar ratio of 3:1. 200 g of the uniformly mixed raw materials were weighed, 10% distilled water was added, and they were stirred thoroughly for 10 min and then put into a mold with a diameter of 120 mm and kept under a pressure of 75 kN for 30 s. The prepared samples were put into an oven and dried to a constant weight. Finally, the samples were put into a silicon molybdenum rod resistance furnace with rapid temperature rise and fired at a high temperature of 1300 °C for 6 h, and this was repeated 2 times.

[0030] The A component and the B component were pre-mixed at a weight ratio of 250:80 for 3 min to obtain a premix. Water was added to the premix at a water-solid ratio of 0.09 and stirred and mixed for 4 min to prepare a two-component frost-resistant and early-strength slurry. Examples 2 - 5

[0031] Examples 2 - 5 respectively provide a two-component frost-resistant and early-strength slurry and a preparation method thereof.

[0032] The differences between the above examples and Example 1 are as follows: the dosages of the components in the B component are different, as shown in Table 1 specifically.

[0033] Table 1 Dosages of the components in the B component in Examples 1 - 5

[0034] The other process parameters in the above examples are the same as those in Example 1. Examples 6 - 9

[0035] Examples 6 - 9 respectively provide a two-component frost-resistant and early-strength slurry and a preparation method thereof.

[0036] The differences between the above examples and Example 1 are as follows: the admixtures in the A component and the B component are different, as shown below specifically.

[0037] In Example 6: the admixture in the A component consists of mineral powder and fly ash at a weight ratio of 10:17.

[0038] In Example 7: the admixture in the A component consists of mineral powder and fly ash at a weight ratio of 10:25.

[0039] In Example 8: the admixture in the B component consists of mineral powder and silica fume at a weight ratio of 10:15.

[0040] In Example 9: the admixture in the B component consists of mineral powder and silica fume at a weight ratio of 10:23.

[0041] The other process parameters in the above examples are the same as those in Example 1. Examples 10 - 14

[0042] Examples 10 - 14 respectively provide a two - component anti - freezing and early - strength slurry and its preparation method.

[0043] The differences between the above - mentioned examples and Example 1 are as follows: the strengthening aids in Component B are different, which are specifically shown as follows.

[0044] In Example 10: the strengthening aid in Component B is composed of a mixture of triethanolamine oleate and tricalcium aluminate with a weight ratio of 1:25.

[0045] In Example 11: the strengthening aid in Component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate with a weight ratio of 1:20.

[0046] In Example 12: the strengthening aid in Component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate with a weight ratio of 1:30.

[0047] In Example 13: the strengthening aid in Component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate with a weight ratio of 1:23.

[0048] In Example 14: the strengthening aid in Component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate with a weight ratio of 1:27.

[0049] Other process parameters in the above - mentioned examples are the same as those in Example 1. Examples 15 - 17

[0050] Examples 15 - 17 respectively provide a two - component anti - freezing and early - strength slurry and its preparation method.

[0051] The differences between the above - mentioned examples and Example 1 are as follows: the weight ratios of Component A and Component B are different, which are specifically shown as follows.

[0052] In Example 15: the weight ratio of Component A and Component B is 250:40.

[0053] In Example 16: the weight ratio of Component A and Component B is 250:60.

[0054] In Example 17: the weight ratio of Component A and Component B is 250:100.

[0055] Other process parameters in the above - mentioned examples are the same as those in Example 1. Comparative Examples Comparative Examples 1 - 5

[0056] Comparative Examples 1 - 5 respectively provide a two - component anti - freezing and early - strength slurry and its preparation method.

[0057] The differences between the above - mentioned comparative examples and Example 1 are specifically shown as follows.

[0058] In Comparative Example 1: Component A: Weigh 265 g of PO42.5 portland cement, 255 g of admixture, 155 g of sand, and 7.4 g of water reducer respectively, and mix them evenly to obtain Component A; Component B: Weigh 9 g of sodium nitrite antifreeze agent, 54 g of enhancing assistant, 36 g of anhydrite, 95 g of admixture, 165 g of sand, and 5.1 g of water reducer respectively, and mix them evenly to obtain Component B.

[0059] In Comparative Example 2: The antifreeze agent in Component B is replaced by an equal amount of triethanolamine instead of sodium nitrite.

[0060] In Comparative Example 3: The dosage of sodium nitrite antifreeze agent in Component B is 4 g, and the dosage of enhancing assistant is 70 g.

[0061] In Comparative Example 4: The enhancing assistant in Component B is composed of a mixture of ethanolamine and tricalcium aluminate with a weight ratio of 1:27.

[0062] In Comparative Example 5: The enhancing assistant in Component B is composed of a mixture of oleic acid ethanolamine and tricalcium aluminate with a weight ratio of 27:1.

[0063] Other process parameters in the above comparative examples are the same as those in Example 1. Performance detection test

[0064] For the two-component antifreeze and early-strength wind power special seat grouting materials prepared in the examples and comparative examples, specimens are molded according to the method provided in GB / T17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)" at 0°C and -15°C respectively, and cured at 0°C and -15°C respectively, and then the compressive strength performance of the molded specimens is detected.

[0065] Test results: As shown in Table 2.

[0066] Table 2 Performance detection results of two-component antifreeze and early-strength slurries prepared in examples and comparative examples

[0067] Combined with the performance test results in the above table, it can be seen that in Comparative Example 1, the dosages of the admixtures of Component A and Component B do not match; in Comparative Example 2, the antifreeze in Component B is replaced by an equal amount of triethanolamine instead of sodium nitrite; in Comparative Example 3, the dosage of the sodium nitrite antifreeze in Component B is 4 g, and the dosage of the strengthening aid is 70 g; in Comparative Example 4, the strengthening aid in Component B is composed of a mixture of ethanolamine and tricalcium aluminate with a weight ratio of 1:27; in Comparative Example 5, the strengthening aid in Component B is composed of a mixture of ethanolamine oleate and tricalcium aluminate with 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 the compressive strength under different negative temperature conditions. In contrast, by using the technical solution provided in the examples of the present application, the prepared two-component antifreeze and early-strength slurry 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 by the present application can flexibly respond to the temperature changes in the construction environment, avoid the situation of frequently replacing materials during the construction process, reduce the workload, and improve the construction efficiency.

[0068] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A two-component frost-resistant and early-strength slurry, characterized in that It is composed of component A and component B in a weight ratio of 25:4-10; 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 additive is composed of a mixture of oleic acid amine and tricalcium aluminate in a weight ratio of 1:20-30.

2. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that It consists of component A and component B in a weight ratio of 25:4-10.

3. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that In the A component and the B component, 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; the water reducer is a polycarboxylic acid superplasticizer.

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

5. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that Among the admixtures of Component B, the apparent density of the mineral powder is 2.78 - 2.98 g / cm 3 , the specific surface area is 825 - 925 m 2 / kg, the active ingredient ≥ 85%, the 3d activity index ≥ 80%, and the 28d activity index ≥ 95%; the performance parameters of the silica fume are the bulk density ≤ 350 kg / m 3 , the specific surface area is 26,000 - 28,000 m 2 / kg, the silicon dioxide content ≥ 90%, the 7d activity index ≥ 105%, the 28d activity index ≥ 115%, and the water demand ratio ≤ 125%.

6. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that Among the reinforcing aids of Component B, the performance parameters of the tricalcium aluminate are as follows: density 2.98 - 3.18 g / cm 3 , free calcium oxide content ≤ 0.1%, tricalcium aluminate content ≥ 98%; The preparation method of tricalcium aluminate is as follows: the 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% of distilled water is added and fully stirred, and a pressure of 60-80 kN is maintained for 25-40 seconds, and the prepared sample is placed in an oven and dried to constant weight; and then the sample is fired at 1250-1350° C. for 5-8 hours, and the process is repeated 2-3 times to obtain the solid material.

7. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that In the reinforcing auxiliary agent of component B, the oleylamine substance is selected from one or more of oleic acid triethanolamine, oleic acid ethanolamine and oleic acid ethylenediamine.

8. The two-component frost-resistant and early-strength slurry according to claim 1, characterized in that In the B component, the reinforcing auxiliary agent is composed of a mixture of oleyl ethanolamine and tricalcium aluminate in a weight ratio of 1:23-27.

9. A preparation method of the two-component frost-resistant and early-strength slurry according to any one of claims 1-8, characterized in that The specific steps include: According to the formula, weigh the corresponding weight portions of each raw material component to obtain component A and component B; Component A and component B are premixed according to the ratio, and the premixing time is 2-3 minutes to obtain a premixed material; According to the water-to-solid ratio of 0.085-0.095, water is added to the premix, and the mixture is stirred for 3-5 minutes to prepare a two-component antifreeze early strength slurry.

10. Application of the two-component frost-resistant and early-strength slurry according to any one of claims 1-8 in concrete for wind power generation construction.

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