Concrete admixture for inhibiting negative effect of flocculating agent as well as preparation method and application of concrete admixture

Abstract

The invention relates to the technical field of concrete admixtures, and particularly discloses a concrete admixture for inhibiting the negative effect of a flocculating agent as well as a preparation method and application of the concrete admixture. The invention discloses a concrete admixture for inhibiting the negative effect of a flocculating agent. The concrete admixture is prepared from the following components in parts by mass: 1 to 2 parts of a water reducing agent, 1 to 1.5 parts of hydroxyethylidene diphosphonic acid, 0.1 to 0.5 part of sodium monofluorophosphate, 0.1 to 0.5 part of glucomannan and 0.05 to 0.1 part of turpentine. The concrete admixture for inhibiting the negative effect of the flocculating agent provided by the invention can effectively neutralize or weaken the adverse effect of the flocculating agent on concrete performance, and meanwhile, keeps good concrete workability and mechanical property, so that the long-term durability of concrete is comprehensively improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete admixtures, and in particular to a concrete admixture for inhibiting the negative effects of a flocculant, a preparation method and an application thereof. Background Art

[0002] Artificial sand is made by mechanically crushing and screening natural rocks, ore tailings or industrial waste, etc., and fine particles and dust are inevitably mixed in during its production process. In order to improve the classification efficiency and reduce water consumption in the production process of artificial sand, flocculants such as polyacrylamide, polydimethyldiallyl ammonium chloride and its derivatives are usually added in wet production. These flocculants aggregate fine particles suspended in water to form larger flocs through charge neutralization and bridging, which is convenient for sedimentation and separation.

[0003] However, when these machine-made sands with flocculant residues are used as concrete aggregates, negative effects may occur in the concrete: first, the presence of flocculants will lead to an increase in the interfacial bonding between cement paste and aggregates, significantly reducing the fluidity of the concrete mixture and increasing the difficulty of construction; second, flocculants affect the dispersion of cement particles, resulting in uneven water distribution inside the concrete, aggravated bleeding, and affecting the surface quality of the concrete; in addition, flocculants may also interfere with the normal hydration process of cement, resulting in slow development of early strength of concrete, or even insufficient strength in the later stage, and may cause the pore structure of concrete to deteriorate, increase permeability, reduce impermeability and freeze-thaw resistance, and seriously affect the long-term durability of concrete.

[0004] Therefore, it is crucial to solve the negative effects brought by flocculants, which can not only improve the quality of concrete and ensure its good workability and mechanical properties, but also effectively utilize machine-made sand as building aggregate, help reduce dependence on natural river sand, ease resource shortages, and promote the sustainable development of the construction industry. Summary of the invention

[0005] In order to solve the negative effects brought by flocculants, the present application provides a concrete admixture for inhibiting the negative effects of flocculants, a preparation method and an application. The concrete admixture for inhibiting the negative effects of flocculants provided in the present application can effectively neutralize or weaken the adverse effects of flocculants on concrete performance, while maintaining good concrete workability and mechanical properties, thereby comprehensively improving the long-term durability of concrete.

[0006] In the first aspect, the present application provides a concrete admixture for suppressing the negative effects of flocculants using the following technical solution: A concrete admixture for inhibiting the negative effects of a flocculant comprises the following components in parts by mass: 1 to 2 parts of a water reducer, 1 to 1.5 parts of hydroxyethylidene diphosphonic acid, 0.1 to 0.5 parts of sodium monofluorophosphate, 0.1 to 0.5 parts of glucomannan, and 0.05 to 0.1 parts of turpentine.

[0007] In the above technical scheme, the present application significantly inhibits the negative effects of residual flocculants in machine-made sand on concrete through the synergistic effect between hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine, and cooperates with a water reducer. Specifically, hydroxyethylidene diphosphonic acid prevents the precipitation of calcium ions and other metal ions by complexing them, reducing the agglomeration of cement particles, and sodium monofluorophosphate forms a protective film inside the concrete to prevent the corrosion of chloride ions. The combination of the two not only reduces the aggregation of cement particles caused by flocculants, but also enhances the durability and corrosion resistance of concrete; at the same time, glucomannan, as a natural polysaccharide, can form a protective film in concrete to reduce water loss and improve working performance, while turpentine, as a surfactant, reduces the surface tension of water, promotes the uniform dispersion of cement particles, and reduces agglomeration. This combination effectively inhibits the bleeding caused by flocculants and maintains good fluidity. When the four components of hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine work together with the water reducer, they can effectively reduce the water bleeding rate of concrete and improve the fluidity of concrete, thereby ensuring good workability and mechanical properties of concrete.

[0008] Preferably, 2 to 5 parts of basalt fiber are also included.

[0009] In the above technical solution, this application further improves the strength and durability of concrete by adding basalt fiber, and further reduces the negative impact of flocculants on concrete. Basalt fiber can form a three-dimensional network structure in concrete, effectively preventing the formation and development of micro cracks inside concrete, and improving the crack resistance of concrete. At the same time, basalt fiber can also react chemically with other components in concrete to form chemical bonds, further enhancing the strength and durability of concrete.

[0010] Preferably, the basalt fiber has a length of 6 mm to 12 mm and a diameter of 8 μm to 15 μm.

[0011] In the above technical solution, this application ensures that the network structure formed by basalt fibers in concrete is denser by selecting basalt fibers with a length of 6 mm to 12 mm and a diameter of 8 μm to 15 μm, further improving the mechanical properties and durability of concrete, thereby better suppressing the negative effects of flocculants.

[0012] Preferably, the water reducer is a polycarboxylic acid-based high-efficiency water reducer.

[0013] In the above technical scheme, the present application can better exert the synergistic effect of each component, further suppress the negative effect of flocculant, and improve the comprehensive performance of concrete by selecting polycarboxylic acid-based high-efficiency water-reducing agent as the water-reducing agent component of the present application. Polycarboxylic acid-based high-efficiency water-reducing agent has excellent dispersibility and water-reducing effect, can effectively reduce the water-cement ratio of concrete, and improve the strength and durability of concrete. At the same time, functional groups such as carboxyl in the molecular structure of polycarboxylic acid-based high-efficiency water-reducing agent can chelate with metal ions such as calcium ions in concrete, further reduce the agglomeration of cement particles, and are conducive to the uniform dispersion of concrete and the maintenance of good workability.

[0014] In the second aspect, the present application provides a method for preparing a concrete admixture for suppressing the negative effects of flocculants, which adopts the following technical solution: A method for preparing a concrete admixture for inhibiting the negative effects of a flocculant comprises the following steps: adding a water reducer into 10 times the amount of water, stirring and dissolving, sequentially adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine and mixing evenly to obtain a mixed solution, drying and grinding the mixed solution to obtain the concrete admixture for inhibiting the negative effects of the flocculant.

[0015] In the above technical scheme, the present application first adds a water reducer to 10 times the amount of water and stirs and dissolves it. This step ensures that the water reducer can be evenly dispersed in the water, providing a good dispersion basis for other components added subsequently, and then sequentially adds hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine oil to mix evenly, and then dries and grinds the mixed solution to obtain a concrete admixture that inhibits the negative effects of the flocculant. The preparation method is simple and easy, suitable for industrial production, and can meet the needs of large-scale applications.

[0016] Preferably, the water reducer is added into 10 times the amount of water, stirred and dissolved, and then hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine are added in sequence and mixed evenly, and the stirring is continued to be evenly obtained to obtain a mixed solution, and the mixed solution is dried and ground, and then basalt fiber is added and stirred evenly to obtain a concrete admixture for inhibiting the negative effects of the flocculant.

[0017] In the above technical solution, the present application further improves the use effect of the admixture by adding basalt fiber during the preparation process, and the admixture can more effectively suppress the negative effects of the flocculant.

[0018] In a third aspect, the application of a concrete admixture for suppressing the negative effects of flocculants provided by the present application adopts the following technical solution: The invention discloses an application of a concrete admixture for inhibiting the negative effects of a flocculant, wherein the concrete admixture for inhibiting the negative effects of a flocculant is added into concrete.

[0019] Preferably, the amount of the concrete admixture for inhibiting the negative effects of flocculants added to the concrete is 0.1% to 5% of the total mass of the concrete.

[0020] In the above technical solution, the present application adds a concrete admixture that inhibits the negative effects of flocculants to concrete at a ratio of 0.1% to 5% of the total mass of concrete, which can effectively neutralize or weaken the negative impact of the flocculants remaining in the machine-made sand on the performance of concrete, significantly improve the fluidity of concrete, reduce the water seepage rate, and thus improve the working performance of concrete. At the same time, the admixture can also enhance the durability and corrosion resistance of concrete, improve the strength and crack resistance of concrete, and ensure that the concrete has good mechanical properties.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The concrete admixture for inhibiting the negative effects of flocculants provided in the present application not only significantly improves the fluidity and workability of concrete, reduces the water bleeding rate, but also significantly enhances the durability and corrosion resistance of concrete, and improves the strength and crack resistance of concrete.

[0022] 2. The preparation method of the present application is simple and easy, suitable for industrial production, and can meet the needs of large-scale applications. DETAILED DESCRIPTION

[0023] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0024] Example 1 A concrete admixture for inhibiting the negative effects of a flocculant comprises 1 kg of a water reducing agent, 1 kg of hydroxyethylidene diphosphonic acid, 0.1 kg of sodium monofluorophosphate, 0.1 kg of glucomannan, and 0.05 kg of turpentine.

[0025] Among them, hydroxyethylidene diphosphonic acid was purchased from Shandong Longhui Chemical Co., Ltd.

[0026] Among them, sodium monofluorophosphate was purchased from Shandong Jinshengtai Chemical Co., Ltd.

[0027] Among them, glucomannan was purchased from Shaanxi Shengqi Biotechnology Co., Ltd.

[0028] Among them, turpentine was purchased from Jinan Yingshun Chemical Co., Ltd.

[0029] The water reducer is a polycarboxylic acid-based high-efficiency water reducer purchased from Shanghai Hengchuang Chemical Co., Ltd., model: PC-1055.

[0030] Among them, the preparation method of the concrete admixture for inhibiting the negative effects of flocculants includes the following steps: adding a water reducer to 10 times the amount of water, stirring and dissolving, then sequentially adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine oil and mixing evenly to obtain a mixed solution, drying the mixed solution, and grinding to obtain the concrete admixture for inhibiting the negative effects of flocculants.

[0031] Example 2 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it includes 2kg of a water reducer, 1.5kg of hydroxyethylidene diphosphonic acid, 0.5kg of sodium monofluorophosphate, 0.5kg of glucomannan, and 0.1kg of turpentine.

[0032] Among them, the preparation method of the concrete admixture for inhibiting the negative effects of flocculants includes the following steps: adding a water reducer to 10 times the amount of water, stirring and dissolving, then sequentially adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine oil and mixing evenly to obtain a mixed solution, drying the mixed solution, and grinding to obtain the concrete admixture for inhibiting the negative effects of flocculants.

[0033] Example 3 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it includes 1.5 kg of a water reducer, 1.2 kg of hydroxyethylidene diphosphonic acid, 0.3 kg of sodium monofluorophosphate, 0.3 kg of glucomannan, and 0.08 kg of turpentine.

[0034] Among them, the preparation method of the concrete admixture for inhibiting the negative effects of flocculants includes the following steps: adding a water reducer to 10 times the amount of water, stirring and dissolving, then sequentially adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine oil and mixing evenly to obtain a mixed solution, drying the mixed solution, and grinding to obtain the concrete admixture for inhibiting the negative effects of flocculants.

[0035] Example 4 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it also includes 2 kg of basalt fiber.

[0036] Among them, the basalt fiber length is 6mm to 12mm, and the diameter is 8μm to 15μm.

[0037] Among them, the preparation method of the concrete admixture for inhibiting the negative effects of flocculants includes the following steps: adding a water reducer to 10 times the amount of water, stirring to dissolve, adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine in sequence and mixing evenly, continuing to stir evenly to obtain a mixed solution, drying the mixed solution, grinding it, and then adding basalt fiber, stirring evenly to obtain the concrete admixture for inhibiting the negative effects of flocculants.

[0038] Example 5 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it also includes 5 kg of basalt fiber.

[0039] Among them, the basalt fiber length is 6mm to 12mm, and the diameter is 8μm to 15μm.

[0040] Among them, the preparation method of the concrete admixture for inhibiting the negative effects of flocculants includes the following steps: adding a water reducer to 10 times the amount of water, stirring to dissolve, adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan, and turpentine in sequence and mixing evenly, continuing to stir evenly to obtain a mixed solution, drying the mixed solution, grinding it, and then adding basalt fiber, stirring evenly to obtain the concrete admixture for inhibiting the negative effects of flocculants.

[0041] Comparative Example 1 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it does not contain hydroxyethylidene diphosphonic acid.

[0042] Comparative Example 2 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it does not contain sodium monofluorophosphate.

[0043] Comparative Example 3 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it does not contain glucomannan.

[0044] Comparative Example 4 A concrete admixture for inhibiting the negative effects of a flocculant, which is different from Example 1 in that it does not contain turpentine.

[0045] Performance Testing Test samples: concrete admixtures for inhibiting the negative effects of flocculants in the above-mentioned embodiments and comparative examples.

[0046] Preparation of C30 concrete: 210kg cement, 60kg slag, 80kg fly ash, 790kg machine-made sand, 1030kg crushed stone, 170kg water. The sample dosage is 4%, and the flocculant content in the machine-made sand is 0.03%.

[0047] Testing method: Refer to GB / T 50080-2016 "Standard Test Method for Performance of Ordinary Concrete Mixtures" to test the slump and expansion of concrete mixtures, and refer to GB / T 50081-2019 "Standard Test Method for Physical and Mechanical Properties of Concrete" to test the compressive strength of concrete.

[0048] For the above test, three parallel tests were performed for each sample, and the results were averaged (see Table 1).

[0049] Table 1: From the analysis of the concrete admixtures for inhibiting the negative effects of flocculants in the above-mentioned embodiments and comparative examples, it can be seen that the concrete admixture for inhibiting the negative effects of flocculants provided by the present application, based on hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine, can significantly improve the working performance and mechanical properties of concrete through the synergistic effect between the components.

[0050] Combining the analysis of Example 1 and Comparative Examples 1 to 4, it can be seen that compared with Example 1, Comparative Examples 1 to 4 lack any of the components of hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine, and the slump, expansion and compressive strength of the concrete of Example 1 are good, which further verifies the necessity of adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine simultaneously in the concrete admixture for inhibiting the negative effects of flocculants.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A concrete admixture for inhibiting the negative effects of flocculants, characterized in that: The invention comprises the following components in parts by weight: 1 to 2 parts of water reducing agent, 1 to 1.5 parts of hydroxyethylidene diphosphonic acid, 0.1 to 0.5 parts of sodium monofluorophosphate, 0.1 to 0.5 parts of glucomannan, and 0.05 to 0.1 parts of turpentine.

2. A concrete admixture for suppressing the negative effects of flocculants according to claim 1, characterized in that: Also includes 2 to 5 parts of basalt fiber.

3. A concrete admixture for suppressing the negative effects of flocculants according to claim 2, characterized in that: The basalt fiber has a length of 6 mm to 12 mm and a diameter of 8 μm to 15 μm.

4. A concrete admixture for suppressing the negative effects of flocculants according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid-based high-efficiency water reducing agent.

5. A method for preparing a concrete admixture for suppressing the negative effects of flocculants as claimed in any one of claims 1 to 4, characterized in that: The method comprises the following steps: adding a water reducer into 10 times the amount of water, stirring and dissolving, sequentially adding hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine and mixing evenly to obtain a mixed solution, drying and grinding the mixed solution to obtain a concrete admixture capable of inhibiting the negative effects of a flocculant.

6. The method for preparing a concrete admixture for suppressing the negative effects of flocculants according to claim 5, characterized in that: Add a water reducer into 10 times the amount of water, stir and dissolve, then add hydroxyethylidene diphosphonic acid, sodium monofluorophosphate, glucomannan and turpentine in sequence and mix evenly, continue to stir evenly to obtain a mixed solution, dry the mixed solution, grind it, add basalt fiber, stir evenly to obtain a concrete admixture that inhibits the negative effects of flocculants.

7. Use of a concrete admixture for inhibiting the negative effects of flocculants as claimed in any one of claims 1 to 4, characterized in that: Concrete admixtures that inhibit the negative effects of flocculants are added to concrete.

8. The use of a concrete admixture for suppressing the negative effects of flocculants according to claim 7, characterized in that: The amount of the concrete admixture for inhibiting the negative effects of flocculants added to the concrete is 0.1% to 5% of the total mass of the concrete.

Images