Anti-sensitive rheological agent suitable for concrete and preparation method of anti-sensitive rheological agent
By using a combination of anti-mud and anti-bleeding polycarboxylate superplasticizers and other functional materials in concrete, the sensitivity problem of concrete under high mud content conditions is solved, improving fluidity and durability, and ensuring construction quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GANSU CHAOXINXIYUE NEW MATERIALS CO LTD
- Filing Date
- 2026-02-04
- Publication Date
- 2026-04-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing concrete rheology modifiers have poor resistance to sensitivity under conditions of raw materials with high mud content, leading to problems such as increased concrete viscosity, easy bleeding and segregation, and layering, which affect construction quality and efficiency.
By using anti-mud-type polycarboxylate superplasticizers and anti-bleeding polycarboxylate superplasticizers, combined with components such as hydroxypropyl methylcellulose ether, sodium polyacrylate, maltodextrin, sodium gluconate, sodium hexametaphosphate, and sodium sulfate, a rheology modifier with anti-sensitivity is formed, which improves the fluidity, water retention, and anti-bleeding ability of concrete, thereby enhancing the durability of concrete.
It significantly improves the fluidity and water retention of concrete, reduces sensitivity, prevents bleeding, enhances the strength and durability of concrete, and ensures construction quality and efficiency.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of building materials technology, specifically to a rheology modifier for resisting sensitivity in concrete and its preparation method. Background Technology
[0002] With the comprehensive greening and low-carbon transformation of the economy and society, concrete, as the building material with the largest consumption, is also facing the transformation towards greening and low carbonization. The most effective measures for greening and low carbonization of concrete are twofold: 1. Increase the amount of chemical rheology modifiers and reduce the amount of cement; 2. Use local materials for fine aggregates and coarse aggregates to reduce long-distance transportation and transshipment.
[0003] According to the water-cement ratio law, to ensure concrete strength while reducing cement usage, the water-cement ratio must be lowered. Lowering the water-cement ratio requires increasing the amount of rheology modifier used in concrete. However, increasing the amount of rheology modifier can lead to a series of problems, such as increased concrete viscosity, increased sensitivity, increased susceptibility to bleeding and segregation, increased tendency to segregate and form layers, and a loss of workability due to increased slump after a certain period of settling. These factors will severely affect concrete pouring efficiency and construction quality.
[0004] The biggest challenge in using locally sourced fine aggregates and aggregates lies in the fact that the mud content and specific composition of the mud significantly affect the rheological properties of concrete. Traditional concrete rheology modifiers have poor resistance to mud and are highly sensitive to changes in mud content and composition, making it difficult to function stably under conditions of high mud content in raw materials. This not only increases the difficulty of controlling the concrete mix proportions but also directly affects the quality and durability of the final project.
[0005] Currently, the approach to addressing concrete sensitivity issues involves adding large amounts of air-entraining agents, thickeners, and inorganic salt additives to the concrete. However, the addition of these substances is not very effective in resolving sensitivity and can also have certain negative effects, such as reducing concrete strength, affecting concrete density, and increasing the risk of alkali-aggregate reaction in concrete.
[0006] Therefore, there is an urgent need for a rheology modifier that is high-performance, easy to use, and helps improve the performance of concrete—an anti-sensitivity rheology modifier. Summary of the Invention
[0007] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a rheology modifier for use in concrete and its preparation method. The rheology modifier of this invention is based on a low-sensitivity polycarboxylate superplasticizer and is supplemented by research on functional materials. It exhibits stable performance, multiple functions, and wide applicability, not only improving the performance of fresh concrete but also significantly enhancing its strength and durability.
[0008] To achieve the objectives of this invention, the rheology modifier for use in concrete is composed of the following components: Component A, comprising anti-mud-type polycarboxylate superplasticizer and anti-bleeding polycarboxylate superplasticizer; Component B, comprising hydroxypropyl methylcellulose ether and sodium polyacrylate; Component C, comprising alkylphenol polyoxyethylene ether; Component D, comprising maltodextrin, sodium gluconate and sodium hexametaphosphate; and Component E, comprising sodium sulfate and sodium metabisulfite.
[0009] Component A is a self-developed polycarboxylate superplasticizer with multiple functions. It can improve the fluidity of concrete, overcome the influence of mud content and composition on rheology modifiers, and improve the concrete's resistance to bleeding. Component B can effectively increase the viscosity of free water, thereby significantly improving the water retention performance of concrete. This helps prevent bleeding in concrete during resting or construction. Component C, as a nonionic surfactant, is added to the concrete mixing water to improve the adaptability of the concrete liquid phase system to acids, alkalis, hard water, and some reducing and oxidizing components. Component D can effectively control the hydration rate of concrete, reduce the heat of hydration, and ensure that the concrete is fully and uniformly hydrated. Component E is an activating component that effectively activates the activity of admixtures and additives in cement, thereby compensating for the impact of admixture changes on concrete strength.
[0010] Furthermore, in some embodiments of the present invention, the preparation method of the anti-mud polycarboxylate superplasticizer includes the following steps: (1) Preparation of base material: First, water is injected into the reactor, the stirring device is started, and isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and methoxy polyethylene glycol ether (MPEG-350) are slowly added and stirred until fully dissolved; then hydrogen peroxide, 2-methyl-2-acrylate-2-(phosphonooxy) ethyl ester, 2-acrylamide-2-methylpropanesulfonic acid and hydroxyethyl acrylate are added to the reactor in sequence and stirred. (2) Preparation of the dropper: The dropper consists of material a, material b and material c: Preparation of component A: Mix acrylic acid and water thoroughly; Preparation of ingredient b: Mix VC, mercaptopropionic acid, and water thoroughly; Preparation of material c: Mix water and hexadecyltrimethylammonium chloride thoroughly; (3) Synthesis of anti-mud polycarboxylate superplasticizer: The prepared materials a and b are slowly added dropwise to the reactor containing the bottom material. After the materials a and b are added, the reactor is kept warm and reacted. Then the prepared material c is slowly added to the reactor and stirred. The reaction is completed to obtain the anti-mud polycarboxylate superplasticizer.
[0011] Further, in some embodiments of the present invention, step (1) of the preparation method of the anti-mud polycarboxylate superplasticizer is specifically as follows: first, 25-30 parts of deionized water are injected into the reactor, the water temperature is heated to 17-23°C and maintained at a constant temperature; stirring is performed, and 20-25 parts of isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and 10-15 parts of methoxy polyethylene glycol ether (MPEG-350) are slowly added, and stirring is continued until fully dissolved; then, 0.20-0.25 parts of hydrogen peroxide, 0.5-1 parts of 2-methyl-2-acrylate-2-(phosphonooxy)ethyl ester, 0.5-1 parts of 2-acrylamide-2-methylpropanesulfonic acid and 0.15-0.25 parts of hydroxypropyl acrylate are added to the reactor in sequence, stirring is continued, and the reaction temperature is maintained at 20°C to 25°C.
[0012] Furthermore, in some embodiments of the present invention, step (2) in the preparation method of the anti-mud polycarboxylate superplasticizer specifically comprises: The feed consists of feed material A, feed material B, and feed material C: Preparation of component A: Thoroughly mix 3.0-3.5 parts acrylic acid and 2.5-5.5 parts water; Preparation of ingredient b: Thoroughly mix 0.04-0.08 parts of vitamin C, 0.080-0.105 parts of mercaptopropionic acid, and 5-9 parts of water; Preparation of material c: Mix 20-23 parts of deionized water and 2-5 parts of hexadecyltrimethylammonium chloride thoroughly.
[0013] Further, in some embodiments of the present invention, step (3) in the preparation method of the anti-mud polycarboxylate superplasticizer is specifically as follows: the prepared material a and material b are simultaneously and slowly added dropwise to the reactor containing the bottom material. After the materials a and b are added, the temperature is maintained at 40-45°C and the reaction is continued for 40-50 minutes. Then the prepared material c is slowly added to the reactor, ensuring that the reaction temperature is maintained at 40-45°C, and stirring is started for 30-40 minutes. The reaction is completed, and the anti-mud polycarboxylate superplasticizer is obtained.
[0014] Furthermore, in some embodiments of the present invention, the preparation method of the anti-bleeding polycarboxylate superplasticizer includes the following steps: (1) Preparation of base material: First, inject water into the reactor and start the stirring device; slowly add isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and continue stirring until fully dissolved; then add hydrogen peroxide, polyacrylamide, hydroxyethyl methacrylate and hydroxypropyl acrylate to the reactor in sequence and continue stirring; (2) Preparation of the droplet: The droplet consists of material d and material e: Preparation of material d: Mix acrylic acid and water thoroughly; e-material preparation: Mix VC, mercaptopropionic acid and water thoroughly; (3) Synthesis of anti-bleeding polycarboxylate superplasticizer: The prepared d material and e material are added dropwise to the reactor containing the bottom material. After the d material and e material are added, the reactor is kept warm for reaction. Then, water and warm wheel glue are added to the reactor, stirred and mixed evenly to obtain the anti-bleeding polycarboxylate superplasticizer.
[0015] Further, in some embodiments of the present invention, step (1) of the preparation method of the anti-bleeding polycarboxylate superplasticizer is specifically as follows: first, 25-30 parts of deionized water are injected into the reactor and the water temperature is controlled at 20±2℃; stir, slowly add 35-40 parts of isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and continue stirring until fully dissolved; then add 0.20-0.25 parts of hydrogen peroxide, 0.7-1 parts of polyacrylamide, 0.5-1 parts of hydroxyethyl methacrylate and 0.15-0.25 parts of hydroxypropyl acrylate to the reactor in sequence and stir.
[0016] Furthermore, in some embodiments of the present invention, step (2) in the preparation method of the anti-bleeding polycarboxylate superplasticizer specifically comprises: The feed consists of feed d and feed e: Preparation of material d: Thoroughly mix 4.0-4.5 parts of acrylic acid and 2.0-5.0 parts of deionized water; Preparation of e-material: Mix 0.06-0.1 parts of vitamin C, 0.1-0.12 parts of mercaptopropionic acid, and 4-8 parts of deionized water thoroughly.
[0017] Further, in some embodiments of the present invention, step (3) of the preparation method of the anti-bleeding polycarboxylate superplasticizer is specifically as follows: the prepared d material and e material are simultaneously added dropwise to the reaction vessel containing the base material. After the d material and e material are added dropwise, the temperature is maintained at 40-45 degrees Celsius and the reaction is continued for 30-40 minutes. Then, 15-25 parts of deionized water and 0.5-1 parts of warm wheel glue are slowly added to the reaction vessel and stirred for 30-40 minutes to fully react and obtain the anti-bleeding polycarboxylate superplasticizer.
[0018] Furthermore, in some embodiments of the present invention, the mass ratio of the anti-mud polycarboxylate superplasticizer and the anti-bleeding polycarboxylate alkaline water in component A is 1.5-8.5:1.5-8.5.
[0019] Furthermore, in some embodiments of the present invention, the mass ratio of hydroxypropyl methylcellulose ether to sodium polyacrylate in component B is 2-4:6-12.
[0020] Furthermore, in some embodiments of the present invention, the mass ratio of maltodextrin, sodium gluconate, and sodium hexametaphosphate in component D is 4-6:8-12:4-6.
[0021] Furthermore, in some embodiments of the present invention, the mass ratio of sodium sulfate to sodium metabisulfite in component E is 4-6:6-12.
[0022] Furthermore, in some embodiments of the present invention, the anti-sensitivity rheology modifier comprises, by weight, 20-25 parts of component A, 0.08-0.15 parts of component B, 0.1-0.5 parts of component C, 1-3 parts of component D, 2-5 parts of component E, and 65-75 parts of water.
[0023] Furthermore, the present invention also provides a method for preparing the aforementioned rheology modifier for use in concrete, the method comprising the following steps: (1) Pour water into a stirred reactor, add component A, stir thoroughly, and mix evenly; (2) Based on step (1), add components B and C in sequence, turn on the heating device, maintain the temperature at 37-43℃, stir, and ensure complete dissolution; (3) Based on step (2), add components D and E in sequence, and stir thoroughly to completely dissolve to obtain a mixture; (4) The mixture obtained in step (3) is transported to a homogenization tank for homogenization. After sufficient homogenization, the anti-sensitivity rheology agent suitable for concrete is obtained.
[0024] Compared with the prior art, the advantages of the present invention are as follows: In this invention, component A consists of independently developed anti-mud polycarboxylate superplasticizer and anti-bleeding polycarboxylate superplasticizer, exhibiting good resistance to concrete sensitivity; component B is composed of hydroxypropyl methylcellulose ether and sodium polyacrylate, possessing excellent water retention properties, reducing concrete sensitivity, and ensuring that concrete does not exhibit segregation, bleeding, or bottoming phenomena; component C improves the adaptability of the concrete liquid phase system to acids, alkalis, hard water, and some reducing and oxidizing components; in component D, maltodextrin, sodium gluconate, and sodium hexametaphosphate synergistically enhance the concrete's sensitivity to temperature changes and improve its plasticity retention capacity; component E is an activating component, effectively activating the activity of admixtures and additives in cement, thereby compensating for the impact of admixture changes on concrete strength.
[0025] The anti-sensitivity rheology modifier of the present invention is a low-carbon and environmentally friendly product. Its raw materials are non-toxic and harmless, and its production process is green and environmentally friendly. On the one hand, it can save costs, and on the other hand, it has stable performance. After adding the anti-sensitivity rheology modifier of the present invention to concrete, it can greatly improve the durability of concrete and ensure the safe use of concrete under extreme conditions. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It should be understood that the following description is merely illustrative and not intended to limit the invention.
[0027] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including the ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.
[0028] The singular form includes the plural objects of discussion, unless the context clearly indicates otherwise. "Optional" or "any one" means that the matter or event described thereafter may or may not occur, and the description includes both the possibility that the event occurs and the possibility that the event does not occur.
[0029] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the quantity (i.e., number of times) of the element or component. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.
[0030] Furthermore, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., described below refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example. Moreover, the technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.
[0031] Unless otherwise stated, all parts mentioned in this invention are parts by weight.
[0032] The preparation method of the anti-sensitivity rheology modifier applicable to concrete in a specific embodiment of the present invention is as follows: (1) Pour a certain amount of tap water into a stainless steel reactor with a stirrer, add a certain amount of component A, stir thoroughly, and mix evenly; (2) Based on step (1), add components B and C in sequence, turn on the heating device, maintain the temperature at 40°C, stir for 20 minutes to ensure complete dissolution; (3) Based on step (2), add components D and E in sequence, and stir thoroughly to completely dissolve to obtain a mixture; (4) The mixture obtained in step (3) is transported to a homogenization tank for homogenization. After sufficient homogenization, the anti-sensitivity rheology agent suitable for concrete is obtained.
[0033] The preparation method of the anti-sensitivity rheology modifier described in the comparative example is also as described above. If a certain component is missing, the corresponding step will not add that component. For example, in Comparative Example 2, step (1) does not add anti-bleeding polycarboxylate superplasticizer, while other steps remain unchanged.
[0034] The preparation method of the anti-mud polycarboxylate superplasticizer described in this invention includes the following steps: (1) Preparation of base material: First, inject 25-30 parts of deionized water into a stainless steel or enamel-lined reactor, turn on the electric heating device to heat the water to 20°C and maintain a constant temperature; start the stirring device and slowly add 20-25 parts of isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and 10-15 parts of methoxy polyethylene glycol ether (MPEG-350), and continue stirring until fully dissolved; then add 0.20-0.25 parts of hydrogen peroxide, 0.5-1 parts of 2-methyl-2-acrylate-2-(phosphonooxy)ethyl ester, 0.5-1 parts of 2-acrylamide-2-methylpropanesulfonic acid and 0.15-0.25 parts of hydroxyethyl methacrylate to the reactor in sequence, and continue stirring for 10 minutes; maintain the reaction temperature at 20°C to 25°C through the combined action of the heating and cooling devices.
[0035] (2) Preparation of dropwise feed: The feed consists of component A and component B: Preparation of component A: Thoroughly mix 3.0-3.5 parts acrylic acid and 2.5-5.5 parts deionized water; Preparation of ingredient b: Thoroughly mix 0.04-0.08 parts of vitamin C, 0.080-0.105 parts of mercaptopropionic acid, and 5-9 parts of deionized water.
[0036] Preparation of material c: Mix 20-23 parts of deionized water and 2-5 parts of hexadecyltrimethylammonium chloride thoroughly.
[0037] (3) Synthesis of anti-mud polycarboxylate superplasticizer: The prepared materials a and b are pumped into tank a and tank b respectively; at the same time, the peristaltic pumps of tank a and tank b are turned on, and materials a and b are slowly dripped into the reactor containing the bottom material (the dripping time is controlled at 80-90 minutes); after the materials a and b are dripped, the temperature is maintained at 40-45 degrees Celsius, and the reaction is continued for 40-50 minutes; then the prepared material c is slowly added into the reactor, ensuring that the reaction temperature is maintained at 40-45 degrees Celsius, and stirring is turned on for 30-40 minutes. The reaction is complete, and the anti-mud polycarboxylate superplasticizer is obtained. The main performance indicators of the anti-mud polycarboxylate superplasticizer are as follows: water reduction rate ≥30%, good slump retention ability, anti-mud property reaches Grade I, excellent impermeability, anti-bleeding property Grade II, wide adaptability, and concrete fluidity is not affected by mud components.
[0038] The preparation method of the anti-bleeding polycarboxylate superplasticizer of the present invention includes the following steps: (1) Preparation of base material: First, inject 25-30 parts of deionized water into a stainless steel reactor, turn on the temperature control device, and control the water temperature at 20±2℃; start the stirring device, slowly add 35-40 parts of isopentenyl alcohol polyoxyethylene ether (TPEG-2400) and stir continuously until fully dissolved; then add 0.20-0.25 parts of hydrogen peroxide, 0.7-1 parts of polyacrylamide, 0.5-1 parts of hydroxyethyl methacrylate and 0.15-0.25 parts of hydroxypropyl acrylate to the reactor in sequence, and stir for 30 minutes; (2) Preparation of the droplet: The droplet consists of material d and material e: Preparation of material d: Thoroughly mix 4.0-4.5 parts of acrylic acid and 2.0-5.0 parts of deionized water; Preparation of e-material: Thoroughly mix 0.06-0.1 parts of vitamin C, 0.1-0.12 parts of mercaptopropionic acid, and 4-8 parts of deionized water; (3) Synthesis of anti-bleeding polycarboxylate superplasticizer: The prepared d material and e material are pumped into the d dropping tank and e dropping tank respectively; first, turn on the peristaltic pump of the d dropping tank and slowly add the d material to the reactor containing the bottom material (the dropping time is controlled at 60 minutes). After 10 minutes, turn on the peristaltic pump of the e dropping tank and slowly add the e material to the reactor containing the bottom material (the time is controlled at 50 minutes); after the d material and e material are added, keep the temperature at 40-45 degrees Celsius and continue to react for 30-40 minutes; then slowly add 15-25 parts of deionized water and 0.5-1 parts of warm wheel glue to the reactor and stir for 30-40 minutes to react fully to obtain the anti-bleeding polycarboxylate superplasticizer. The main properties of anti-bleeding polycarboxylate superplasticizer are: water reduction rate ≥25%, anti-bleeding property reaches Grade I, anti-mud property reaches Grade II, wide adaptability, and no bleeding or segregation will occur even if the amount is excessive, the amount of water is increased, or the aggregate gradation is unreasonable.
[0039] As long as the specific raw materials and process parameters in the preparation methods of the above-mentioned anti-mud polycarboxylate superplasticizer and anti-bleeding polycarboxylate superplasticizer are selected within the range described above, the final anti-mud polycarboxylate superplasticizer and anti-bleeding polycarboxylate superplasticizer will not have significant differences and will meet the requirements of this invention. Example
[0040] A rheology modifier for use in concrete, comprising the following parts by weight of raw materials: Component A: 6 parts anti-mud type polycarboxylate superplasticizer, 3.0 parts acrylic acid were used in the preparation of component A; 16 parts anti-bleeding type polycarboxylate superplasticizer, the heat preservation temperature was 40℃ after the addition of components D and E in the preparation. Component B: 0.04 parts hydroxypropyl methylcellulose ether, 0.08 parts sodium polyacrylate; Component C: 0.04 parts alkylphenol polyoxyethylene ether, 0.2 parts rosin thermal polymer; Component D: 0.5 parts maltodextrin, 1 part sodium gluconate, 0.5 parts sodium hexametaphosphate; Component E: 1 part sodium sulfate, 2 parts sodium metabisulfite; Water: 72.64 portions. Example
[0041] A rheology modifier for use in concrete, comprising the following parts by weight of raw materials: Component A: 12 parts anti-mud type polycarboxylate superplasticizer, 3.2 parts acrylic acid were used in the preparation of component A; 12 parts anti-bleeding type polycarboxylate superplasticizer, the heat preservation temperature was 42℃ after the addition of components D and E in the preparation. Component B: 0.06 parts hydroxypropyl methylcellulose ether, 0.06 parts sodium polyacrylate; Component C: 0.06 parts alkylphenol polyoxyethylene ether, 0.18 parts rosin thermal polymer; Component D: 0.4 parts maltodextrin, 1 part sodium gluconate, 0.6 parts sodium hexametaphosphate; Component E: 1.5 parts sodium sulfate, 1.5 parts sodium metabisulfite; Water: 70.64 parts. Example
[0042] A rheology modifier for use in concrete, comprising the following parts by weight of raw materials: Component A: 15 parts anti-mud type polycarboxylate superplasticizer, 3.5 parts acrylic acid were used in the preparation of component A; 5 parts anti-bleeding type polycarboxylate superplasticizer, the heat preservation temperature was 45℃ after the addition of components D and E in the preparation. Component B: 0.05 parts hydroxypropyl methylcellulose ether, 0.1 parts sodium polyacrylate; Component C: 0.08 parts alkylphenol polyoxyethylene ether, 0.16 parts rosin thermal polymer; Component D: 0.4 parts maltodextrin, 1.2 parts sodium gluconate, 0.4 parts sodium hexametaphosphate; Component E: 1.2 parts sodium sulfate, 2.4 parts sodium metabisulfite; Water: 74.07 portions.
[0043] Compared with Example 1, the difference lies in component A, which is replaced by a polycarboxylate-based water-reducing agent (mainly acrylic acid).
[0044] Compared with Example 1, the difference is that component A does not contain the anti-bleeding polycarboxylate superplasticizer described in this invention, but is entirely composed of the anti-mud-type polycarboxylate superplasticizer described in this invention.
[0045] Compared with Example 1, the difference is that component A does not contain the anti-mud type polycarboxylate superplasticizer described in this invention, but is entirely composed of the anti-bleeding type polycarboxylate superplasticizer described in this invention.
[0046] I. Testing methods for mud resistance Mortar flowability method (recommended rapid method) (1) Reference mortar: According to GB / T 8077, the cement, standard sand and water-cement ratio are fixed, rheology modifier (addition amount 2.0%) is added, and the initial fluidity (M0) and 60 min fluidity (M1) are measured.
[0047] (2) Muddy mortar: Replace 3%~5% of the standard sand mass with an equal mass of clay, keep other materials unchanged, repeat step 1, and measure the initial flowability (M0') and the flowability over time (M1').
[0048] (3) Calculate the flowability ratio and retention rate: • Initial mud fluidity ratio R0 = (M0' / M0) × 100%.
[0049] • The retention rate of mud fluidity over time R1 = [ (M1' / M0') / (M1 / M0) ] × 100%.
[0050] II. Test for resistance to bleeding (concrete method) (1) Experimental principle: The amount of water bleeding in concrete with PCA admixture during static setting under standard conditions is measured, the water bleeding rate is calculated, and it is compared with the reference PCA or blank group.
[0051] (2) Experimental procedure: 2.1 Proceed according to GB / T 50080.
[0052] 2.2 Concrete mixtures containing the rheology modifier to be tested (sample) and conventional polycarboxylate superplasticizer (reference) were molded separately.
[0053] 2.3 Pour the mixture into a covered water bleeding rate measuring cylinder in one go, vibrate to compact and smooth it. Start timing from the time the surface is smoothed.
[0054] 2.4 Use a pipette to remove the oozing water at regular intervals (e.g., 10 min, 20 min, 30 min, 1 h, 2 h) until no water is oozed for three consecutive times. Record the cumulative amount of oozing water.
[0055] 2.5 Calculate the bleeding rate (B) and the bleeding rate ratio (BR).
[0056] • Percolation rate B = (Vw / (W × G)) × 100% (Vw: total bleeding water, ml; W: water consumption in concrete, g; G: mass of concrete sample, g) • Bleeding rate ratio BR = (B sample / B baseline) × 100% The test results are shown in the table below:
[0057] Those skilled in the art will readily understand that the above description is merely an example of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A rheology modifier for use in concrete, characterized in that, The rheology modifier suitable for use in concrete is composed of the following components: Component A, which contains anti-mud polycarboxylate superplasticizer and anti-bleeding polycarboxylate superplasticizer; Component B, which contains hydroxypropyl methylcellulose ether and sodium polyacrylate; Component C, which contains alkylphenol polyoxyethylene ether; Component D, which contains maltodextrin, sodium gluconate and sodium hexametaphosphate; and Component E, which contains sodium sulfate and sodium metabisulfite. The preparation method of the anti-mud polycarboxylate superplasticizer includes the following steps: (1) Preparation of base material: First, inject water into the reactor, start the stirring device, slowly add isopentenyl alcohol polyoxyethylene ether and methoxy polyethylene glycol ether, and continue stirring until fully dissolved; then add hydrogen peroxide, 2-methyl-2-acrylate-2-(phosphonooxy)ethyl ester, 2-acrylamide-2-methylpropanesulfonic acid and hydroxyethyl acrylate to the reactor in sequence, and continue stirring; (2) Preparation of the dropper: The dropper consists of material a, material b and material c: Preparation of component A: Mix acrylic acid and water thoroughly; Preparation of ingredient b: Mix VC, mercaptopropionic acid, and water thoroughly; Preparation of material c: Mix water and hexadecyltrimethylammonium chloride thoroughly; (3) Synthesis of anti-mud polycarboxylate superplasticizer: The prepared material a and material b are slowly added dropwise to the reactor containing the bottom material. After the materials a and b are added, the reactor is kept warm and reacted. Then the prepared material c is slowly added to the reactor and stirred. The reaction is completed to obtain the anti-mud polycarboxylate superplasticizer. The preparation method of the anti-bleeding polycarboxylate superplasticizer includes the following steps: (1) Preparation of base material: First, inject water into the reactor and start the stirring device; slowly add isopentenyl alcohol polyoxyethylene ether and continue stirring until fully dissolved; then add hydrogen peroxide, polyacrylamide, hydroxyethyl methacrylate and hydroxypropyl acrylate to the reactor in sequence and continue stirring; (2) Preparation of the droplet: The droplet consists of material d and material e: Preparation of material d: Mix acrylic acid and water thoroughly; e-material preparation: Mix VC, mercaptopropionic acid and water thoroughly; (3) Synthesis of anti-bleeding polycarboxylate superplasticizer: The prepared d material and e material are added dropwise to the reactor containing the bottom material. After the d material and e material are added, the reactor is kept warm for reaction. Then, water and warm wheel glue are added to the reactor, stirred and mixed evenly to obtain the anti-bleeding polycarboxylate superplasticizer.
2. The rheology modifier for resisting sensitivity in concrete according to claim 1, characterized in that, The mass ratio of anti-mud polycarboxylate superplasticizer and anti-bleeding polycarboxylate alkaline water in component A is 1.5-8.5:1.5-8.
5.
3. The rheology modifier for resisting sensitivity in concrete according to claim 1, characterized in that, The mass ratio of hydroxypropyl methylcellulose ether to sodium polyacrylate in component B is 2-4:6-12.
4. The rheology modifier for resisting sensitivity in concrete according to claim 1, characterized in that, The mass ratio of maltodextrin, sodium gluconate, and sodium hexametaphosphate in component D is 4-6:8-12:4-6.
5. The rheology modifier for use in concrete according to claim 1, characterized in that, The mass ratio of sodium sulfate to sodium metabisulfite in component E is 4-6:6-12.
6. The rheology modifier for resisting sensitivity in concrete according to claim 1, characterized in that, The anti-sensitivity rheology modifier contains, by weight, 20-25 parts of component A, 0.08-0.15 parts of component B, 0.1-0.5 parts of component C, 1-3 parts of component D, 2-5 parts of component E, and 65-75 parts of water.
7. The rheology modifier for use in concrete according to claim 1, characterized in that, In the preparation method of the anti-mud polycarboxylate superplasticizer, step (1) specifically involves: first, injecting 25-30 parts of deionized water into the reactor, heating the water temperature to 17-23℃, and maintaining a constant temperature; stirring, slowly adding 20-25 parts of isopentenyl alcohol polyoxyethylene ether and 10-15 parts of methoxy polyethylene glycol ether, and continuing to stir until fully dissolved; then sequentially adding 0.20-0.25 parts of hydrogen peroxide, 0.5-1 parts of 2-methyl-2-acrylate-2-(phosphonooxy)ethyl ester, 0.5-1 parts of 2-acrylamide-2-methylpropanesulfonic acid and 0.15-0.25 parts of hydroxypropyl acrylate to the reactor, continuing to stir, and maintaining the reaction temperature at 20℃ to 25℃; Preferably, step (2) in the preparation method of the anti-mud polycarboxylate superplasticizer specifically comprises: The feed consists of feed material A, feed material B, and feed material C: Preparation of component A: Thoroughly mix 3.0-3.5 parts acrylic acid and 2.5-5.5 parts water; Preparation of ingredient b: Thoroughly mix 0.04-0.08 parts of vitamin C, 0.080-0.105 parts of mercaptopropionic acid, and 5-9 parts of water; Preparation of material c: Mix 20-23 parts of deionized water and 2-5 parts of hexadecyltrimethylammonium chloride thoroughly; Preferably, step (3) in the preparation method of the anti-mud polycarboxylate superplasticizer is as follows: the prepared material a and material b are slowly added dropwise to the reactor containing the bottom material. After the materials a and b are added, the temperature is kept at 40-45℃ and the reaction is continued for 40-50 minutes. Then the prepared material c is slowly added to the reactor, ensuring that the reaction temperature is kept at 40-45℃. At the same time, the stirring is turned on for 30-40 minutes until the reaction is complete, and the anti-mud polycarboxylate superplasticizer is obtained.
8. The rheology modifier for use in concrete according to claim 1, characterized in that, In the preparation method of the anti-bleeding polycarboxylate superplasticizer, step (1) specifically involves: first, injecting 25-30 parts of deionized water into the reactor and controlling the water temperature at 20±2℃; stirring, and slowly adding 35-40 parts of isopentenyl alcohol polyoxyethylene ether while stirring continuously until fully dissolved; then sequentially adding 0.20-0.25 parts of hydrogen peroxide, 0.7-1 parts of polyacrylamide, 0.5-1 parts of hydroxyethyl methacrylate and 0.15-0.25 parts of hydroxypropyl acrylate to the reactor and stirring. Preferably, step (2) in the preparation method of the anti-bleeding polycarboxylate superplasticizer specifically comprises: The feed consists of feed d and feed e: Preparation of material d: Thoroughly mix 4.0-4.5 parts of acrylic acid and 2.0-5.0 parts of deionized water; Preparation of e-material: Mix 0.06-0.1 parts of vitamin C, 0.1-0.12 parts of mercaptopropionic acid, and 4-8 parts of deionized water thoroughly.
9. The rheology modifier for use in concrete according to claim 1, characterized in that, In the preparation method of the anti-bleeding polycarboxylate superplasticizer, step (3) specifically involves: simultaneously adding the prepared d and e materials to a reaction vessel containing the base material; after the d and e materials are added, maintaining the temperature at 40-45 degrees Celsius and continuing the reaction for 30-40 minutes; then slowly adding 15-25 parts of deionized water and 0.5-1 parts of warm wheel adhesive to the reaction vessel and stirring for 30-40 minutes to fully react, thereby obtaining the anti-bleeding polycarboxylate superplasticizer.
10. The method for preparing a rheology modifier suitable for use in concrete according to any one of claims 1-9, characterized in that, The method includes the following steps: (1) Pour water into a stirred reactor, add component A, stir thoroughly, and mix evenly; (2) Based on step (1), add components B and C in sequence, turn on the heating device, maintain the temperature at 37-43℃, stir, and ensure complete dissolution; (3) Based on step (2), add components D and E in sequence, and stir thoroughly to completely dissolve to obtain a mixture; (4) The mixture obtained in step (3) is transported to a homogenization tank for homogenization. After sufficient homogenization, the anti-sensitivity rheology agent suitable for concrete is obtained.