Concrete regulator as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, and discloses a concrete regulator as well as a preparation method and application thereof. The concrete regulator comprises a base material, an auxiliary agent A and an auxiliary agent B, the base material comprises the following components in parts by mass: 60-100 parts of acrylic acid; 1 to 4 parts of polyacrylamide; 20 to 40 parts of sodium gluconate; 10 to 25 parts of caustic soda flakes; 1-3 parts of an air entraining agent; 360 to 400 parts of deionized water; the auxiliary agent A is prepared from the following components in parts by mass: 80 to 120 parts of acrylic acid; 30 to 50 parts of a cross-linking agent; 2-8 parts of a reducing agent; 1-4 parts of a chain transfer agent; 40 to 60 parts of deionized water; the auxiliary agent B comprises the following components in parts by mass: 2-8 parts of an initiator; and 180 to 220 parts of deionized water. The concrete regulator provided by the invention has multiple functions of water retention, foam stabilization and the like, and can effectively improve the problems of poor workability, poor flowability and easy bleeding and segregation of machine-made sand concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to a concrete regulator and a preparation method and application thereof. Background Art

[0002] Concrete is one of the most widely used construction materials. It is made of cementitious materials (such as lime, cement, etc.), granular aggregates (aggregates), water, admixtures, admixtures, etc., which are mixed in a certain proportion, and then uniformly stirred, compacted, and cured and hardened. Coarse and fine aggregates account for more than 75% of the total volume of concrete, playing the role of "skeleton" in concrete. Sand, as fine aggregate, accounts for about 20% to 40% of the volume of concrete, mainly filling the gaps in coarse aggregates and optimizing aggregate grading.

[0003] In recent years, with the increasing scale of infrastructure construction in my country, the use of concrete has greatly increased. After years of continuous exploitation, natural sand resources (river sand, lake sand, mountain sand, desalinated sea sand) have become increasingly scarce, and a supply crisis of sand sources has emerged. In order to replace natural sand, machine-made sand came into being.

[0004] Artificial sand is made by crushing and screening hard rocks such as limestone and granite through crushers, sand making machines, circular vibrating screens and other equipment. Due to the mechanical crushing effect, artificial sand often contains a large amount of stone powder and fine particles with a small particle size and a high proportion. Compared with river sand, artificial sand has too many needle-like flakes, irregular particle shape, large fineness modulus, and unreasonable grading, which affects the workability and fluidity of the concrete mixture when it is used to prepare concrete, resulting in poor workability, poor fluidity, and easy water seepage and segregation of concrete. Therefore, it is urgent to develop a regulator for artificial sand concrete to improve the performance of artificial sand concrete. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide a concrete conditioner.

[0006] The second object of the present invention is to provide a method for preparing the concrete conditioner.

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

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[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 includes the following components in parts by weight:

[0014]

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

[0016] 2-8 parts of initiator;

[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 includes the following components in parts by weight:

[0021]

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

[0023] 2-6 parts of initiator;

[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 dodecylammonium chloride, dodecylammonium bromide, tetradecylammonium chloride, tetradecylammonium bromide, hexadecylammonium chloride, hexadecylammonium bromide, hexadecyltrimethylammonium bromide, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, sodium tetradecyl sulfonate, and sodium hexadecyl sulfonate.

[0027] In the present invention, an air entraining agent is added to a concrete conditioner. When the conditioner is added to concrete, a large number of tiny bubbles are introduced into the concrete, thereby reducing the number and size of capillaries in the concrete, reducing the penetration of water and chemical substances, improving the durability and impermeability of the concrete, and at the same time ensuring the stability of the bubbles during the concrete hardening process to prevent the bubbles from merging or disappearing.

[0028] In some embodiments of the present invention, the cross-linking 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, pyrosulfite, and ferrous salt.

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

[0031] In the present invention, a chain transfer agent is added to a concrete regulator to adjust the molecular weight and structure of a polymer in the process of preparing concrete, thereby increasing the crack resistance of the concrete and improving the 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 according to the first aspect of the present invention, comprising the following steps:

[0034] S1, mixing the components in the base material to obtain the base material;

[0035] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, adding the components to the base material, heat-insulating and aging the base material to obtain the concrete conditioner.

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

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

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

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

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

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

[0042] In some embodiments of the present invention, after the addition of the auxiliary agent A and the auxiliary agent B, the steps of diluting with water and adjusting the pH by adding caustic soda are also included.

[0043] The third aspect of the present invention provides use of the concrete conditioner described in the first aspect of the present invention in preparing machine-made sand concrete.

[0044] In some embodiments of the present invention, the concrete conditioner is compounded with a water reducing agent; 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 compounded for use; 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 reducer is a polycarboxylic acid water reducer.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1) The concrete conditioner provided by the present invention contains a large amount of new cross-linked hydrophilic group conditioner, which can stably and reliably absorb free water in concrete, so that the water retention performance of concrete is significantly improved; a small amount of air entraining agent is added to the concrete conditioner, which has a micro-air entraining effect, can greatly improve the working performance of concrete, and the concrete state is maintained for a long time, and the amount of air entraining agent used in the concrete preparation process can be appropriately reduced, thereby reducing the production cost without reducing the strength of the concrete; the concrete conditioner has a good water retention effect, can replace the thickener, rheological agent, water retention agent and super foaming agent used in compound production, and can effectively reduce the compounding cost;

[0049] 2) The preparation method of the concrete conditioner provided by the present invention has simple steps, short time consumption, mild process conditions, and is suitable for popularization and use;

[0050] 3) The concrete conditioner provided by the present invention is non-toxic, odorless, green and environmentally friendly, has excellent compatibility with polycarboxylate water-reducing agent, is suitable for compounding with polycarboxylate water-reducing agent, and will not cause inhomogeneity such as stratification and precipitation during long-term storage after preparation. Since the concrete conditioner has certain anti-mud and anti-powder effects, the amount of water-reducing agent in the concrete preparation process can be reduced, and the problems of poor workability, poor fluidity and easy water seepage and segregation of machine-made sand concrete can be effectively improved. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test 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 contents of concrete conditioner in Example 1

[0055]

[0056]

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

[0058] S1, mixing the components in the base material to obtain the base material;

[0059] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a 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 contents of concrete conditioner in Example 2

[0063]

[0064]

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

[0066] S1, mixing the components in the base material to obtain the base material;

[0067] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a 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 contents of concrete conditioner in Example 3

[0071]

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

[0073] S1, mixing the components in the base material to obtain the base material;

[0074] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a concrete conditioner.

[0075] Comparative Example 1

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

[0077] Table 4 Components and contents of concrete regulator in comparative example 1

[0078]

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

[0080] S1, mixing the components in the base material to obtain the base material;

[0081] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a concrete conditioner.

[0082] Comparative Example 2

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

[0084] Table 5 Components and contents of concrete regulator in comparative example 2

[0085]

[0086]

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

[0088] S1, mixing the components in the base material to obtain the base material;

[0089] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a concrete conditioner.

[0090] Comparative Example 3

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

[0092] Table 6 Components and contents of concrete regulator in comparative example 3

[0093]

[0094]

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

[0096] S1, mixing the components in the base material to obtain the base material;

[0097] S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, the components are added to the base material at the same time, wherein the addition time of auxiliary agent A is 60 minutes, and the addition time of auxiliary agent B is 70 minutes. After the addition is completed, heat preservation and aging are carried out for 90 minutes, 236 parts by mass of deionized water are added for dilution, and caustic soda is added to adjust the pH to 3-7 to obtain a concrete conditioner.

[0098] Application Examples

[0099] The concrete conditioners prepared in Examples 1-3 and Comparative Examples 1-3 were used for concrete preparation. The raw materials for preparing the concrete also included 360 parts by mass of cement, 1000 parts by mass of fly ash, 760 parts by mass of machine-made sand, and 170 parts by mass of water, wherein the cement was 42.5-grade ordinary Portland cement, and a polycarboxylic acid water reducer (Jiangsu Chaoli Building Materials Co., Ltd., model C7) was added at 0.2% of the total mass of the materials in the concrete, and then the concrete conditioners prepared in Examples 1-3 and Comparative Examples 1-3 were added at a mass ratio of concrete conditioner: polycarboxylic acid water reducer = 4:1000.

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

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

[0102]

[0103] As shown in Table 1, after adding the concrete conditioner provided by the present invention, the problems of poor workability, poor fluidity, and easy water seepage and segregation of the machine-made sand concrete are improved. The concrete conditioner has good compatibility with the polycarboxylate water reducer. After the two are used in combination, without adding a variety of external additives such as thickeners, rheological agents, water retaining agents, and super foaming agents, a machine-made sand concrete with good fluidity, low water seepage, and excellent workability can be obtained. In Comparative Example 1, since the component dosage of the concrete conditioner is not within the scope provided by the present invention, and in Comparative Examples 2 and 3, due to the lack of related components such as air entraining agents and chain transfer agents, the function of the concrete conditioner is affected, and when added to concrete, it cannot play a good regulating role.

[0104] The concrete conditioner provided by the present invention is a multifunctional conditioner having multiple functions such as thickening, water retention, slurrying, foam stabilization, mud resistance, wetting, etc. When used in combination with a polycarboxylate water reducer, the problems of poor workability, poor fluidity, easy water seepage and segregation of machine-made sand concrete can be improved, and the amount of other external additives such as air entraining agent, water retention agent, thickener, etc. in concrete can be reduced, production costs can be saved, and the demand for machine-made sand concrete in infrastructure construction can be met.

Claims

1. A concrete conditioner, characterized in that: It includes base material, auxiliary agent A and auxiliary agent B; The base material comprises the following components in parts by weight: The A auxiliary agent includes the following components in parts by weight: The B auxiliary agent includes the following components in parts by weight: 2-8 parts of initiator; 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, pyrosulfite 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, thioglycolic 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 to 7, characterized in that: The following steps are involved: S1, mixing the components in the base material to obtain the base material; S2. After mixing the components of auxiliary agent A and auxiliary agent B respectively, adding the components to the base material, heat-insulating and aging the base material to obtain the concrete conditioner.

9. Use of the concrete conditioner according to any one of claims 1 to 7 in the preparation of machine-made sand concrete.

10. The use according to claim 9, characterized in that The concrete conditioner is compounded with a water reducing agent for use; the mass ratio of the concrete conditioner to the water reducing agent is (1-5):1000.

Images