Preparation method and application of cement-based material early strength agent
By combining modified American cockroach powder with cement-based materials, the problem of insufficient compressive strength and settling time in the early stage is solved, and the effect of early strength improvement and shortening settling time is achieved.
Patent Information
- Application Number
- CN202510452103.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2025-07-08
AI Technical Summary
The early compressive strength and settling time of traditional cement-based materials are affected by fluctuations in raw material quality, construction conditions and environmental factors, which affect construction quality and safety.
Modified American cockroach powder is used as the premature strength agent for cement-based material. By combining with tricalcium aluminate in cement, the formation of ettringite is accelerated and used as the nucleation site of C-S-H gel to promote rapid crystallization.
Significantly improve the early compressive strength of cement-based materials and reduce settling time to ensure construction quality and safety.
Smart Images
Figure BDA0005354382890000081
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of concrete admixtures for building materials, and particularly relates to a preparation method and application of an early strength agent for cement-based materials. Background Art
[0002] With the rapid development of civil engineering infrastructure construction, the demand for large-scale buildings (such as high-rise buildings, cross-sea bridges, water conservancy projects, and undersea tunnels) is increasing continuously, and the performance requirements for concrete are also rising day by day. Especially in the construction of mass concrete, it is necessary to ensure the early strength and setting time of concrete to meet the safety requirements of the project. However, due to the quality fluctuations of raw materials, construction condition limitations, and environmental factor influences, the early compressive strength and setting time of traditional cement-based materials are often restricted, which not only affects the construction quality and progress, but also threatens the life and property safety of the people.
[0003] In view of the above problems, there is an urgent need for an early strength agent for cement-based materials that is low-cost, widely sourced, and environmentally friendly, which can significantly improve the early compressive strength and setting time of cement-based materials while ensuring the workability of concrete, and provide a reliable guarantee for the popularization and application of mass concrete and other high-performance concretes. Summary of the Invention
[0004] Object of the Invention: The object of the present invention is to provide a green preparation method of an early strength agent for cement-based materials that is widely sourced, low-cost, and environmentally friendly and can improve the early compressive strength and reduce the setting time;
[0005] The second object of the present invention is to provide the application of the early strength agent for cement-based materials obtained by the above method.
[0006] Technical Solution: The preparation method of the early strength agent for cement-based materials described in the present invention includes the following steps:
[0007] (1) Inactivate and clean Periplaneta americana and then make it into powder to obtain Periplaneta americana powder;
[0008] (2) Immerse the Periplaneta americana powder in an AC modification solution for modification to obtain the modified powder, where the AC modification solution includes ethanol, citric acid, and benzoic acid;
[0009] (3) Add the modified powder to water to make a suspension, and place it in an ultrasonic environment for ultrasonic treatment;
[0010] (4) Centrifuge the ultrasonicated suspension, take the lower-layer precipitate, wash, dry, grind, and sieve it to obtain the powder, which is the early strength agent for cement-based materials.
[0011] Among them, in step (1), the preparation method of the Periplaneta americana powder is as follows: The cleaned Periplaneta americana is dried and then crushed to obtain the Periplaneta americana powder.
[0012] Among them, in step (1), the drying temperature of the cleaned Periplaneta americana is 60 - 100 °C, and the time is 8 - 12 h.
[0013] Among them, in step (2), the AC modification solution includes, by mass: 20 - 40 parts of absolute ethanol, 20 - 40 parts of citric acid, and 10 - 20 parts of benzoic acid.
[0014] Preferably, the AC modification solution includes, by mass: 20 - 40 parts of absolute ethanol, 20 - 40 parts of citric acid, 10 - 20 parts of benzoic acid, and 100 parts of deionized water.
[0015] Among them, in step (2), the crushed Periplaneta americana powder is soaked in the AC modification solution at 20 - 60 °C for modification for 6 - 12 h.
[0016] Among them, in step (3), the ultrasonic environment is that the ultrasonic frequency is 40 ± 2 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 - 80 °C, and the ultrasonic duration is 2 - 12 h.
[0017] Among them, in step (4), the centrifuge speed is set at 3000 - 9000 r / min, and the centrifugation duration is 10 - 30 min.
[0018] Among them, in step (4), the lower layer precipitate is taken, washed, dried, ground, and sieved to obtain the powder, which is the early strength agent for cement-based materials.
[0019] Preferably, in step (4), a 100-mesh sieve is selected, and a powdery admixture with a particle size not greater than 0.15 mm can be obtained.
[0020] On the other hand, the present invention provides the application of the early strength agent for cement-based materials obtained by the above method in the preparation of cement-based materials. Preferably, the dosage of the early strength agent is 0.1% - 0.5% of the cementitious material.
[0021] On the other hand, the present invention provides a method for using the early strength agent for cement-based materials obtained by the above method. The method is as follows: The early strength agent is mixed and stirred with mixing water for 30 s - 5 min, and then the stirred suspension is mixed with the cement-based materials.
[0022] Principle of the invention: An early strength agent for cement-based materials of the present invention mainly consists of lysine. This early strength agent is incorporated during the mixing of cement. The amino group (-NH2) of the lysine contained therein combines with tricalcium aluminate (C3A) in the cement, accelerating the formation of ettringite (AFt) and optimizing the compactness of early hydration products. At the same time, as the nucleation site of C-S-H gel, it promotes its rapid crystallization, thereby achieving the effects of improving the early compressive strength and reducing the setting time of cement-based materials.
[0023] Beneficial effects: Compared with the prior art, the present invention has achieved the following remarkable effects: The present invention uses modified Periplaneta americana powder as an early strength agent for cement-based materials. The amino group (-NH2) of the lysine contained therein combines with tricalcium aluminate (C3A) in the cement, accelerating the formation of ettringite (AFt) and optimizing the compactness of early hydration products. At the same time, as the nucleation site of C-S-H gel, it promotes its rapid crystallization, thereby achieving the effects of improving the early compressive strength and reducing the setting time of cement-based materials. Detailed implementation manners
[0024] The present invention will be further described in detail below.
[0025] Example 1
[0026] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0027] Wash and inactivate Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in AC modification liquid for 12 h, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, the ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration is 15 min; take the lower-layer precipitate, wash, dry, grind and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix and stir the early strength agent and mixing water at a dosage of 0.1% by mass ratio of cement paste for 5 min, and add the mixed solution to cement and stir. The water-cement ratio is 0.5 to make specimens.
[0028] Among them, the AC modification liquid includes, by mass: 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0029] Example 2
[0030] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0031] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, and place it in an ultrasonic environment for ultrasonic treatment. The ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifugation speed to 6000 r / min, and the centrifugation duration to 15 min; take the lower precipitate, wash, dry, grind and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 0.2% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir. The water-cement ratio is 0.5 to make specimens.
[0032] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0033] Example 3
[0034] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0035] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, and place it in an ultrasonic environment for ultrasonic treatment. The ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifugation speed to 6000 r / min, and the centrifugation duration to 15 min; take the lower precipitate, wash, dry, grind and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 0.3% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir. The water-cement ratio is 0.5 to make specimens.
[0036] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0037] Example 4
[0038] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0039] Wash and inactivate Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Immerse the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, with an ultrasonic frequency of 40 KHz, an ultrasonic power of 60 W, an ultrasonic temperature of 20 °C, and an ultrasonic duration of 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration to 15 min; take the lower-layer precipitate, wash, dry, grind into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture content of 0.5% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0040] Among them, the AC modification solution includes, by mass parts: 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0041] Example 5
[0042] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0043] Wash and inactivate Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Immerse the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, with an ultrasonic frequency of 40 KHz, an ultrasonic power of 60 W, an ultrasonic temperature of 20 °C, and an ultrasonic duration of 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration to 15 min; take the lower-layer precipitate, wash, dry, grind into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture content of 1.0% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0044] Among them, the AC modification solution includes, by mass parts: 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0045] Example 6
[0046] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0047] Wash and inactivate Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, and place it in an ultrasonic environment for ultrasonic treatment. The ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration to 15 min; take the lower-layer precipitate, wash it, dry it, grind it into powder and sieve it. Select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 0.1% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir. The water-cement ratio is 0.5 to make specimens.
[0048] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 30 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0049] Example 7
[0050] A preparation method of an early strength agent for cement-based materials, comprising the following steps:
[0051] Wash and inactivate Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, and place it in an ultrasonic environment for ultrasonic treatment. The ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration to 15 min; take the lower-layer precipitate, wash it, dry it, grind it into powder and sieve it. Select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 1.0% by the mass ratio of cement paste, stir for 5 min, add the mixed solution to cement and stir. The water-cement ratio is 0.5 to make specimens.
[0052] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 30 parts of citric acid, 15 parts of benzoic acid, and 100 parts of deionized water.
[0053] Example 8
[0054] A preparation method of an early strength agent for cement-based materials, comprising the following steps:
[0055] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, with an ultrasonic frequency of 40 KHz, an ultrasonic power of 60 W, an ultrasonic temperature of 20 °C, and an ultrasonic duration of 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed at 6000 r / min, and the centrifuge duration at 15 min; take the lower-layer precipitate, wash, dry, grind into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at a dosage of 1.0% of the mass ratio of cement paste and stir for 5 min, add the mixed solution to cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0056] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 30 parts of citric acid, 10 parts of benzoic acid, and 100 parts of deionized water.
[0057] Example 9
[0058] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0059] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, with an ultrasonic frequency of 40 KHz, an ultrasonic power of 60 W, an ultrasonic temperature of 20 °C, and an ultrasonic duration of 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed at 6000 r / min, and the centrifuge duration at 15 min; take the lower-layer precipitate, wash, dry, grind into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at a dosage of 1.0% of the mass ratio of cement paste and stir for 5 min, add the mixed solution to cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0060] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 20 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0061] Example 10
[0062] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0063] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, the ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration is 15 min; take the lower-layer precipitate, wash it, dry it, grind it into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 1.0% by mass of the cement paste and stir for 5 min, add the mixed solution to the cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0064] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 20 parts of citric acid, 15 parts of benzoic acid, and 100 parts of deionized water.
[0065] Example 11
[0066] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0067] Wash and inactivate the Periplaneta americana, dry it at 80 °C for 12 h and then crush it. Soak the crushed Periplaneta americana powder in the AC modification solution for 12 h of modification, filter to obtain the powder, and wash it; add the modified powder to deionized water to make a suspension, place it in an ultrasonic environment for ultrasonic treatment, the ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; centrifuge the ultrasonicated suspension, set the centrifuge speed to 6000 r / min, and the centrifuge duration is 15 min; take the lower-layer precipitate, wash it, dry it, grind it into powder and sieve it, select a 100-mesh sieve, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. Mix the early strength agent with mixing water at an admixture amount of 1.0% by mass of the cement paste and stir for 5 min, add the mixed solution to the cement and stir, with a water-cement ratio of 0.5, to make specimens.
[0068] Among them, the AC modification solution includes, by mass: 20 parts of absolute ethanol, 0 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water.
[0069] Example 12
[0070] A preparation method of an early strength agent for cement-based materials includes the following steps:
[0071] The cleaned and inactivated Periplaneta americana is dried at 80 °C for 12 h and then crushed. The crushed Periplaneta americana powder is soaked in the AC modification solution for 12 h of modification, filtered to obtain the powder, and washed; the modified powder is added to deionized water to form a suspension, which is placed in an ultrasonic environment for ultrasonic treatment. The ultrasonic frequency is 40 KHz, the ultrasonic power is 60 W, the ultrasonic temperature is 20 °C, and the ultrasonic duration is 12 h; the ultrasonic suspension is centrifuged, the centrifugation speed is set at 6000 r / min, and the centrifugation duration is 15 min; the lower-layer precipitate is taken, washed, dried, ground into powder and sieved. A 100-mesh sieve is selected, and the powder with a particle size not exceeding 0.15 mm is the early strength agent, and its main component is amino acid. The early strength agent is mixed and stirred with mixing water at a dosage of 1.0% of the mass ratio of the cement paste, and the mixed solution is added to the cement and stirred. The water-cement ratio is 0.5 to make specimens.
[0072] Among them, the AC modification solution includes by mass: 20 parts of absolute ethanol, 40 parts of citric acid, 0 part of benzoic acid, and 100 parts of deionized water.
[0073] Control Example 1
[0074] Compared with Example 1, the difference is that this ratio does not add modified Periplaneta americana powder as an early strength agent. Cement paste specimens with a water-cement ratio of 0.5 are prepared.
[0075] Control Example 2
[0076] Compared with Example 1, the difference is that this ratio does not add modified Periplaneta americana powder as an early strength agent, and lysine is added at a dosage of 1.0% of the mass ratio of the cement paste to prepare cement paste specimens with a water-cement ratio of 0.5.
[0077] In each example and control example of the present invention, specimens are molded using a PP mold.
[0078] Testing of the compressive strength and setting time of specimens:
[0079] Specimen curing conditions: Temperature: 20 °C, Humidity: 90%.
[0080] Specimen curing age: 1 d, 3 d, 7 d, 28 d.
[0081] The compressive strength is tested using an electronic universal testing machine (DNS100), and the loading rate is 0.5 kN / s.
[0082] The setting time is tested using a Vicat apparatus, with the initial setting needle and the final setting needle.
[0083] Conduct the first setting time measurement 30 minutes after adding water and curing. When approaching the initial setting, measure every 5 minutes. When the test needle sinks to a position 4 mm ± 1 mm from the bottom plate, it is the initial setting state of the cement. After completing the measurement of the initial setting specimen, immediately remove the test mold together with the paste from the glass plate in a translational manner, turn it over 180°, place it on the glass plate with the large end up and the small end down, and continue curing. When approaching the final setting, measure every 15 minutes.
[0084] Test the compressive strength and setting time of Examples 1-10 and Comparative Example 1, and the results are shown in Table 1.
[0085] Table 1 Compressive strength of Examples 1-10 and Comparative Example 1
[0086]
[0087] As can be seen from Table 1, compared with the compressive strength of Comparative Example 1, the compressive strength of each age of the cement paste specimens with this early strength agent added has increased to a certain extent, and it gradually decreases with the increase of the dosage of the early strength agent. The 1-day compressive strengths of Examples 1-5 changed by +46.31%, +43.19%, +37.45%,
[0088] +33.73% and +13.48% respectively; the 3-day compressive strengths of Examples 1-5 changed by +20.96%,
[0089] +19.59%, +19.11%, +9.3% and +0.23% respectively; the 7-day compressive strengths of Examples 1-5 changed by +19.96%, +15.54%, +12.32%, +9.28% and +0.25% respectively; the 28-day compressive strengths of Examples 1-5 changed by +20.73%, +19.85%, +16.45%, +9.96% and -2.04% respectively. This shows that the early strength agent of the present invention improves the compressive strength of the cement-based material to a certain extent and the improvement of the early compressive strength is obvious. Among them, Example 1 is the best ratio and 0.1% is the best dosage. Compared with the compressive strengths of different ages of Comparative Example 2 with 1.0% lysine added as an admixture, the compressive strengths of different ages of the cement paste specimens of Example 1 with 1.0% of this early strength agent added have increased to a certain extent. The 1-day compressive strength has increased by 5.19%, the 3-day compressive strength has increased by 10.49%, the 7-day compressive strength has increased by 18.27%, and the 28-day compressive strength has increased by 8.29%. This shows that compared with pure lysine as an admixture, the early strength agent of the present invention has more advantages in improving the compressive strength of the cement-based material.
[0090] As can be seen from Table 1, compared with the setting time of Comparative Example 1, the setting times of the cement paste specimens with this early-strength agent added are all reduced to a certain extent at each age, and the setting time gradually extends with the increase of the dosage of the early-strength agent. The initial setting times of Examples 1-5 changed by -40.00%, -33.33%, -33.33%, -26.70%, -6.70%, and the final setting times changed by -13.85%, -9.23%, -10.77%, -10.77%, -9.23%. This shows that the early-strength agent of the present invention reduces the initial setting time and final setting time of the cement-based material to a certain extent. Among them, Example 1 is the best ratio, and 0.1% is the best dosage. Compared with the setting time of Comparative Example 2 with 1.0% lysine added as an admixture, the setting time of the cement paste specimen of Example 1 with 1.0% of this early-strength agent added is reduced to a certain extent. The initial setting time is shortened by 11.11%, and the final setting time is shortened by 3.57%. This shows that compared with pure lysine as an admixture, the early-strength agent of the present invention has more advantages in reducing the setting time of the cement-based material.
[0091] As can be seen from Table 1, compared with the compressive strength of Example 1, the 1d compressive strengths of Examples 6-12 changed by -1.17%, -2.75%, -6.06%, -8.60%, -6.72%, -7.12%, -4.53% respectively; the 3d compressive strengths changed by -3.9%, -6.97%, -7.64%, -7.87%, -8.98%, -9.45%, -7.56% respectively; the 7d compressive strengths changed by -2.8%, -6.4%, -7.95%, -6.78%, -8.11%, -9.03%, -12.43% respectively; the 28d compressive strengths changed by -4.7%, -5.08%, -5.16%, -7.20%, -8.80%, -5.76%, -6.64% respectively; the initial setting times changed by +11.11%, +11.11%, +11.11%, +11.11%, +11.11%, +11.11%, +11.11% respectively; the final setting times changed by +1.79%,
[0092] +3.57%, +10.71%, +8.93%, +12.5%, +3.57%, +5.36%. It can be seen from this that the ratio of the components in the AC modifier also affects the compressive strength and setting time of this coagulant. It can be shown that, by mass fraction, 20 parts of absolute ethanol, 40 parts of citric acid, 20 parts of benzoic acid, and 100 parts of deionized water are the best mixing ratios of the AC modifier.
Claims
1. A preparation method of an early strength agent for cement-based materials, characterized in that, The preparation method comprises the following steps: (1) inactivating and cleaning American cockroaches and preparing the powder to obtain American cockroach powder; (2) modifying the American cockroach powder by immersing it in an AC modifying liquid to obtain a modified powder, wherein the AC modifying liquid comprises ethanol, citric acid and benzoic acid; (3) adding the modified powder into water to prepare a suspension, and placing it in an ultrasonic environment for ultrasonic treatment; (4) Centrifuge the suspension after ultrasound and take out the lower layer of sediment, which is the cement-based material early strength agent.
2. The preparation method of the early strength agent for cement-based materials according to claim 1, characterized in that, In step (1), the preparation method of the American cockroach powder is: drying the cleaned American cockroaches and crushing them to obtain the American cockroach powder.
3. The preparation method of the early strength agent for cement-based materials according to claim 2, characterized in that, In step (1), the cleaned American cockroaches are dried at a temperature of 60 to 100° C. for 8 to 12 hours.
4. The preparation method of the early strength agent for cement-based materials according to claim 1, wherein In step (2), the AC modified liquid comprises, by weight, 20 to 40 parts of anhydrous ethanol, 20 to 40 parts of citric acid, and 10 to 20 parts of benzoic acid.
5. The preparation method of the early strength agent for cement-based materials according to claim 1, characterized in that In step (2), the crushed American cockroach powder is immersed in an AC modification liquid at 20 to 60° C. for modification for 6 to 12 hours.
6. The preparation method of the early strength agent for cement-based materials according to claim 1, characterized in that, In step (3), the ultrasonic frequency of the ultrasonic treatment is 40±2KHz, the ultrasonic power is 60W, the ultrasonic temperature is 20-80°C, and the ultrasonic time is 2-12h; and / or, in step (4), the centrifuge speed is set to 3000-9000r / min, and the centrifugation time is 10-30min.
7. The preparation method of the early strength agent for cement-based materials according to claim 1, characterized in that, In step (4), the lower layer of sediment is taken out, cleaned, dried, ground and sieved to obtain the cement-based material early strength agent.
8. Use of the cement-based material early strength agent obtained by the method according to any one of claims 1 to 7 in the preparation of cement-based materials.
9. The application according to claim 8, wherein The dosage of the early strength agent is 0.1% to 0.5% of the cementitious material.
10. A method for using an early strength agent for cement-based materials obtained by the method according to claim 1, characterized in that, The method of use is: mix the early strength agent with mixing water and stir for 30s to 5min, and then mix the stirred suspension with cement-based materials.