A concrete conditioner, its preparation method and application

Abstract

This invention relates to the field of building materials technology, and discloses a concrete conditioner, its preparation method, and its application. The concrete conditioner includes a base material, an A-type auxiliary agent, and a B-type auxiliary agent. The base material comprises the following components in parts by weight: 60-100 parts acrylic acid; 1-4 parts polyacrylamide; 20-40 parts sodium gluconate; 10-25 parts caustic soda flakes; 1-3 parts air-entraining agent; and 360-400 parts deionized water. The A-type auxiliary agent comprises the following components in parts by weight: 80-120 parts acrylic acid; 30-50 parts crosslinking agent; 2-8 parts reducing agent; 1-4 parts chain transfer agent; and 40-60 parts deionized water. The B-type auxiliary agent comprises the following components in parts by weight: 2-8 parts initiator; and 180-220 parts deionized water. The concrete conditioner provided by this invention has multiple functions such as water retention and foam stabilization, and can effectively improve the problems of poor workability, poor fluidity, and easy bleeding and segregation in manufactured sand concrete.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a concrete conditioner, its preparation method, and its application. Background Technology

[0002] Concrete is one of the most widely used building materials. It is made by mixing cementitious materials (such as lime and cement), granular aggregates, water, admixtures, and additives in a certain proportion, followed by uniform mixing, compaction, and curing. Coarse and fine aggregates account for more than 75% of the total volume of concrete, playing a "skeleton" role. Sand, as fine aggregate, accounts for about 20% to 40% of the concrete volume, mainly filling the voids in the coarse aggregate and optimizing the aggregate gradation.

[0003] In recent years, with the increasing scale of infrastructure construction in my country, the use of concrete has increased significantly. After years of continuous mining, natural sand resources (river sand, lake sand, mountain sand, and desalinated sea sand) are becoming increasingly scarce, leading to a crisis in the supply of sand sources. To replace natural sand, manufactured sand has emerged.

[0004] Manufactured sand is produced by finely crushing and screening hard rocks such as limestone and granite using equipment such as crushers, sand making machines, and circular vibrating screens. Due to the mechanical crushing process, manufactured sand often contains a large proportion of small-sized stone powder and fine particles. Compared to river sand, manufactured sand has more needle-like and flaky particles, irregular particle shape, large fineness modulus, and unreasonable gradation. This affects the workability and fluidity of concrete mixes, resulting in poor workability, poor fluidity, and easy bleeding and segregation. Therefore, there is an urgent need to develop a modifier for manufactured sand concrete to improve its performance. Summary of the Invention

[0005] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a concrete conditioner.

[0006] The second objective of this invention is to provide a method for preparing this concrete conditioner.

[0007] The third objective of this invention is to provide the application of this concrete conditioner.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A first aspect of the present invention provides a concrete conditioner, comprising a base material, an auxiliary agent A, and an auxiliary agent B;

[0010] The base material comprises the following components in parts by weight:

[0011]

[0012]

[0013] The A auxiliary agent comprises the following components in parts by weight:

[0014]

[0015] The B auxiliary agent comprises the following components in parts by weight:

[0016] Initiator 2-8 parts;

[0017] 180-220 parts of deionized water.

[0018] In some embodiments of the present invention, the concrete conditioner comprises a base material, an auxiliary agent A, and an auxiliary agent B; the base material comprises the following components in parts by weight:

[0019]

[0020] The A auxiliary agent comprises the following components in parts by weight:

[0021]

[0022] The B auxiliary agent comprises the following components in parts by weight:

[0023] Initiator 2-6 parts;

[0024] 190-200 parts of deionized water.

[0025] In some embodiments of the present invention, the pH of the concrete conditioner is 3-7.

[0026] In some embodiments of the present invention, the air-entraining agent is selected from at least one of dodecyl ammonium chloride, dodecyl ammonium bromide, tetradecyl ammonium chloride, tetradecyl ammonium bromide, hexadecyl ammonium chloride, hexadecyl ammonium bromide, hexadecyltrimethylammonium bromide, sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, sodium tetradecyl sulfonate, and sodium hexadecyl sulfonate.

[0027] In this invention, an air-entraining agent is added to the concrete conditioner. When the conditioner is added to the concrete, a large number of micro air bubbles are introduced into the concrete, thereby reducing the number and size of capillaries in the concrete, reducing the penetration of water and chemicals, improving the durability and impermeability of the concrete, and ensuring the stability of the air bubbles during the concrete hardening process, preventing the air bubbles from merging or disappearing.

[0028] In some embodiments of the present invention, the crosslinking agent is selected from at least one of methyl methacrylate and butyl acrylate.

[0029] In some embodiments of the present invention, the reducing agent is selected from at least one of L-ascorbic acid, bisulfite, sulfite, thiosulfate, metabisulfite, and ferrous salt.

[0030] In some embodiments of the present invention, the chain transfer agent is selected from at least one of mercaptopropionic acid, mercaptoacetic acid, isopropanol, sodium formate, isooctyl 3-mercaptopropionate, dodecyl mercaptan, sodium hypophosphite, and mercaptoethanol.

[0031] In this invention, a chain transfer agent is added to the concrete conditioner to adjust the molecular weight and structure of the polymer during the concrete preparation process, thereby improving the crack resistance and workability of the concrete.

[0032] In some embodiments of the present invention, the initiator is selected from at least one of ammonium persulfate, potassium persulfate, sodium persulfate, azobisisobutyronitrile, and azobisisoheptanenitrile.

[0033] The second aspect of the present invention provides a method for preparing the concrete conditioner described in the first aspect of the present invention, comprising the following steps:

[0034] S1. Mix the components in the base material to obtain the base material;

[0035] S2. Mix the components of A and B additives separately, add them to the base material, and heat-preserve and mature them to obtain the concrete conditioner.

[0036] In some embodiments of the present invention, the addition of the A auxiliary agent is completed in 50-70 minutes.

[0037] In some specific embodiments of the present invention, the addition of the A auxiliary agent is completed in 55-65 minutes.

[0038] In some embodiments of the present invention, the addition of the B auxiliary agent is completed in 60-80 minutes.

[0039] In some specific embodiments of the present invention, the addition of the B auxiliary agent is completed in 65-75 minutes.

[0040] In some embodiments of the present invention, the heat preservation and curing time is 80-100 min.

[0041] In some specific embodiments of the present invention, the heat preservation and curing time is 85-95 minutes.

[0042] In some embodiments of the present invention, after the addition of auxiliary agent A and auxiliary agent B is completed, the method further includes the steps of adding water for dilution and adding caustic soda flakes to adjust the pH.

[0043] The third aspect of the present invention provides the application of the concrete conditioner described in the first aspect of the present invention in the preparation of manufactured sand concrete.

[0044] In some embodiments of the present invention, the concrete conditioner and the water-reducing agent are used in combination; the mass ratio of the concrete conditioner to the water-reducing agent is (1-5):1000.

[0045] In some specific embodiments of the present invention, the concrete conditioner and the water-reducing agent are used in combination; the mass ratio of the concrete conditioner to the water-reducing agent is (3-5):1000.

[0046] In some embodiments of the present invention, the water-reducing agent is a polycarboxylate water-reducing agent.

[0047] Compared with the prior art, the beneficial effects of the present invention are:

[0048] 1) The concrete conditioner provided by this invention contains a large number of cross-linked hydrophilic groups, which can stably and reliably adsorb free water in concrete, thus significantly improving the water retention performance of concrete. A small amount of air-entraining agent is added to the concrete conditioner, which has a micro-air-entraining effect, which can greatly improve the workability of concrete and maintain the concrete state for a long time. It can appropriately reduce the amount of air-entraining agent used in the concrete preparation process, reduce production costs without reducing the strength of concrete. The concrete conditioner has a good water retention effect and can replace thickeners, rheology modifiers, water-retaining agents and foaming agents used in compound production, which can effectively reduce compounding costs.

[0049] 2) The method for preparing the concrete conditioner provided by this invention has simple steps, short time consumption, and mild process conditions, making it suitable for widespread use;

[0050] 3) The concrete modifier provided by this invention is non-toxic, odorless, and environmentally friendly. It has excellent compatibility with polycarboxylate superplasticizer and is suitable for compound use with polycarboxylate superplasticizer. After long-term storage, it will not exhibit unevenness such as stratification or sedimentation. Since the concrete modifier has certain anti-mud and anti-powdering effects, it can reduce the amount of superplasticizer added during concrete preparation and effectively improve the problems of poor workability, poor fluidity, and easy bleeding and segregation of manufactured sand concrete. Detailed Implementation

[0051] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0052] Example 1

[0053] This embodiment provides a concrete conditioner, the components and contents of which are shown in Table 1:

[0054] Table 1. Components and content of concrete conditioner in Example 1

[0055]

[0056]

[0057] The preparation steps for concrete conditioner are as follows:

[0058] S1. Mix the components in the base material to obtain the base material;

[0059] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0060] Example 2

[0061] This embodiment provides a concrete conditioner, the components and contents of which are shown in Table 2:

[0062] Table 2. Components and content of concrete conditioner in Example 2

[0063]

[0064]

[0065] The preparation steps for concrete conditioner are as follows:

[0066] S1. Mix the components in the base material to obtain the base material;

[0067] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0068] Example 3

[0069] This embodiment provides a concrete conditioner, the components and contents of which are shown in Table 3:

[0070] Table 3. Components and content of concrete conditioner in Example 3

[0071]

[0072] The preparation steps for concrete conditioner are as follows:

[0073] S1. Mix the components in the base material to obtain the base material;

[0074] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0075] Comparative Example 1

[0076] This comparative example provides a concrete conditioner, the components and contents of which are shown in Table 4:

[0077] Table 4 shows the components and content of the concrete conditioner in Comparative Example 1.

[0078]

[0079] The preparation steps for concrete conditioner are as follows:

[0080] S1. Mix the components in the base material to obtain the base material;

[0081] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0082] Comparative Example 2

[0083] This comparative example provides a concrete conditioner, the components and contents of which are shown in Table 5:

[0084] Table 5. Components and content of concrete conditioner in Comparative Example 2

[0085]

[0086]

[0087] The preparation steps for concrete conditioner are as follows:

[0088] S1. Mix the components in the base material to obtain the base material;

[0089] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0090] Comparative Example 3

[0091] This comparative example provides a concrete conditioner, the components and contents of which are shown in Table 6:

[0092] Table 6 shows the components and content of the concrete conditioner in Comparative Example 3.

[0093]

[0094]

[0095] The preparation steps for concrete conditioner are as follows:

[0096] S1. Mix the components in the base material to obtain the base material;

[0097] S2. Mix the components of A and B additives separately and add them to the base material simultaneously. The addition time for A additive is 60 minutes and the addition time for B additive is 70 minutes. After addition, keep it warm and mature for 90 minutes, add 236 parts by mass of deionized water to dilute, and add caustic soda flakes to adjust the pH to 3-7 to obtain the concrete conditioner.

[0098] Application examples

[0099] The concrete modifiers prepared in Examples 1-3 and Comparative Examples 1-3 were used in concrete preparation. The raw materials for concrete preparation also included 360 parts by weight of cement, 1000 parts by weight of fly ash, 760 parts by weight of manufactured sand, and 170 parts by weight of water. The cement was 42.5 grade ordinary Portland cement. Polycarboxylate superplasticizer (Jiangsu Chaoli Building Materials Co., Ltd., model C7) was added at 0.2% of the total mass of materials in the concrete. Then, the concrete modifiers prepared in Examples 1-3 and Comparative Examples 1-3 were added at a mass ratio of concrete modifier:polycarboxylate superplasticizer = 4:1000.

[0100] The relevant performance tests of concrete were conducted in accordance with GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" and GB / T 8076-2016 "Concrete Admixtures". Table 1 shows the performance test results of the concrete in the application example:

[0101] Table 1. Performance test results of concrete in application examples.

[0102]

[0103] As shown in Table 1, the addition of the concrete conditioner provided by this invention improves the poor workability, poor fluidity, and tendency to bleed and segregate in manufactured sand concrete. The concrete conditioner and polycarboxylate superplasticizer have good compatibility; when used together, manufactured sand concrete with good fluidity, resistance to bleeding, and excellent workability can be obtained without adding thickeners, rheology modifiers, water-retaining agents, foaming agents, or other admixtures. In Comparative Example 1, the amount of concrete conditioner components is outside the range provided by this invention. In Comparative Examples 2 and 3, the lack of air-entraining agents, chain transfer agents, and other related components affects the function of the concrete conditioner, preventing it from playing a significant regulatory role when added to concrete.

[0104] The concrete conditioner provided by this invention is a multifunctional conditioner that combines thickening, water retention, slurry formation, foam stabilization, mud resistance, and wetting. When used in combination with polycarboxylate superplasticizer, it can improve the poor workability, poor fluidity, and easy bleeding and segregation of manufactured sand concrete, and reduce the amount of other admixtures such as air-entraining agents, water-retaining agents, and thickeners in concrete, thereby saving production costs and meeting the demand for manufactured sand concrete in infrastructure construction.

Claims

1. A concrete conditioner, characterized in that, It is prepared from base material, auxiliary agent A and auxiliary agent B; The base material consists of the following components in parts by weight. composition: 60-100 parts acrylic acid; 1-4 parts of polyacrylamide; 20-40 parts sodium gluconate; 10-25 parts of caustic soda flakes; 1-3 parts of air-entraining agent; 360-400 parts deionized water; The A auxiliary agent is composed of the following components in parts by weight: 80-120 parts acrylic acid; 30-50 parts of crosslinking agent; 2-8 parts reducing agent; Chain transfer agent 1-4 parts; 40-60 parts deionized water; The B auxiliary agent is composed of the following components in parts by weight: Initiator 2-8 parts; 180-220 parts of deionized water.

2. The concrete conditioner according to claim 1, characterized in that, The pH of the concrete conditioner is 3-7.

3. The concrete conditioner according to claim 1, characterized in that, The air-entraining agent is selected from at least one of dodecyl ammonium chloride, dodecyl ammonium bromide, tetradecyl ammonium chloride, tetradecyl ammonium bromide, hexadecyl ammonium chloride, hexadecyl ammonium bromide, hexadecyl trimethyl ammonium bromide, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, sodium tetradecyl sulfonate, and sodium hexadecyl sulfonate.

4. The concrete conditioner according to claim 1, characterized in that, The crosslinking agent is selected from at least one of methyl methacrylate and butyl acrylate.

5. The concrete conditioner according to claim 1, characterized in that, The reducing agent is selected from at least one of L-ascorbic acid, bisulfite, sulfite, thiosulfate, metabisulfite, and ferrous salt.

6. The concrete conditioner according to claim 1, characterized in that, The chain transfer agent is selected from at least one of mercaptopropionic acid, mercaptoacetic acid, isopropanol, sodium formate, isooctyl 3-mercaptopropionate, dodecyl mercaptan, sodium hypophosphite, and mercaptoethanol.

7. The concrete conditioner according to claim 1, characterized in that, The initiator is selected from at least one of ammonium persulfate, potassium persulfate, sodium persulfate, azobisisobutyronitrile, and azobisisoheptanenitrile.

8. The method for preparing the concrete conditioner according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Mix the components in the base material to obtain the base material; S2. Mix the components of A and B additives separately, add them to the base material, and heat-preserve and mature them to obtain the concrete conditioner.

9. The use of the concrete modifier according to any one of claims 1-7 in the preparation of manufactured sand concrete.

10. The application according to claim 9, characterized in that, The concrete conditioner and water-reducing agent are used in combination; the mass ratio of the concrete conditioner to the water-reducing agent is (1-5): 1000.

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