High-resistance concrete material and preparation method thereof

Abstract

The invention relates to the technical field of building materials, and particularly discloses a high-resistance concrete material and a preparation method thereof. The concrete material is prepared from the following raw materials in parts by weight: 300 to 400 parts of cement, 30 to 50 parts of silica fume, 50 to 100 parts of heavy calcium powder, 50 to 100 parts of slag powder, 1000 to 1200 parts of broken stone, 700 to 900 parts of sand, 5 to 10 parts of fiber, 0.5 to 1.5 parts of a resistance agent, 0.1 to 1 part of metakaolin, 0.5 to 1.5 parts of a polyurethane waterproof agent and 0.5 to 2 parts of an organic silicon waterproof agent. According to the high-resistance concrete material and the preparation method thereof, by adding the resistance agent, the metakaolin and the polyurethane waterproof agent, the crack resistance and the external sulfate corrosion resistance of concrete are improved, by adding the silica fume, the heavy calcium carbonate powder, the slag powder and the fibers, the compactness and the strength of the concrete are improved, cracks are reduced, and the service life of the concrete is prolonged. The impact resistance of the concrete is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a high-resistance concrete material and a preparation method thereof. Background Art

[0002] Concrete is one of the most commonly used materials in construction projects. It is an artificial stone made of cementitious materials, granular aggregates, water, and resistance agents and admixtures added when necessary in a certain proportion, which are uniformly mixed, compacted and hardened. Concrete has the characteristics of abundant raw materials, low price and simple production process, so its usage is increasing. Concrete has become one of the most widely used building materials in the world with its advantages such as non-toxicity, easy molding, high strength and good durability. The scope of use of concrete is very wide. It is not only used in various civil engineering projects, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc. Concrete is also an important material. In some special environments, such as marine environment, chemical corrosion environment, freeze-thaw cycle environment, etc., traditional concrete often shows poor resistance, and is prone to cracking, spalling, strength reduction and other problems, which seriously affects the service life and safety of buildings. Therefore, it is of great practical significance to develop a concrete with high resistance. Summary of the invention

[0003] The purpose of the present invention is to provide a high-resistance concrete material and a preparation method thereof, so as to solve the problem of insufficient resistance of concrete under special environment in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides a high-resistance concrete material, which is composed of the following raw materials in parts by weight: 300-400 parts of cement, 30-50 parts of silica fume, 50-100 parts of heavy calcium powder, 50-100 parts of slag powder, 1000-1200 parts of crushed stone, 700-900 parts of sand, 5-10 parts of fiber, 0.5-1.5 parts of resistance agent, 0.1-1 parts of high-altitude land, 0.5-1.5 parts of polyurethane waterproofing agent, 0.5-2 parts of silicone waterproofing agent, and 100-150 parts of water.

[0005] Preferably, the cement is ordinary Portland cement with a strength grade of 42.5 or above.

[0006] Preferably, the particle size of the silica fume is 0.1-0.3 μm.

[0007] Preferably, the slag powder is S95 grade slag powder.

[0008] Preferably, the particle size of the crushed stone is 5-25 mm, the sand is medium sand, and the fineness modulus is 2.3-3.0.

[0009] Preferably, the fibers are polypropylene fibers or steel fibers.

[0010] Preferably, the resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 28-40 parts of calcium oxide expansion clinker and 52-70 parts of fly ash and grind them evenly, and then add 2-8 parts of dextrin, 20-200 parts of water, 0.1-1 parts of water-soluble carbon dots and 0.01-1 parts of hydrotalcite and mix them evenly after grinding.

[0011] Preferably, the hydrotalcite is pre-treated by calcination before mixing, the calcination temperature is 450-550° C., and the calcination is carried out in a nitrogen atmosphere for 2-5 hours.

[0012] A method for preparing a high-resistance concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0013] The advantages and positive effects of the high-resistance concrete material and the preparation method thereof described in the present invention are: 1. The high-resistance concrete of the present invention improves the density and strength of the concrete by adding mineral admixtures such as silica fume, heavy calcium powder, and slag powder, while reducing the hydration heat of the concrete and reducing the occurrence of cracks.

[0014] 2. The addition of fiber can effectively improve the crack resistance and toughness of concrete and enhance its impact resistance.

[0015] 3. The use of anti-corrosion agent, high-quality carbon dots, polyurethane waterproofing agent and silicone waterproofing agent can improve the resistance of concrete in corrosive environment and extend the service life of concrete. Calcium oxide expansion clinker is mainly used as expansion component; fly ash mainly plays a dispersing role, and dextrin is used to adjust the heat release rate of concrete hydration. The combined use of calcium oxide expansion clinker, fly ash and dextrin can reduce the temperature rise of concrete structure caused by cement hydration, promote the effective expansion of expansion components, realize the dual regulation of concrete structure temperature field and calcium oxide component expansion process, and improve the crack resistance of concrete; water-soluble carbon dots have small particle size, large specific surface area, and rich oxygen-containing groups such as hydroxyl and carboxyl on the surface. After being compounded with hydrotalcite, the dispersion performance of the material can be greatly improved, and a large number of active sites can be provided to ensure that the composite material can maximize the adsorption of chloride ions and improve the corrosion resistance of concrete; high-quality carbon dots, polyurethane waterproofing agent and silicone waterproofing agent can improve the microstructure of concrete and improve its ability to resist external sulfate erosion.

[0016] The technical solution of the present invention is further described in detail below through embodiments. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further illustrated by the following examples.

[0018] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. Unless otherwise defined, the materials involved in the present invention are all commercially available.

[0019] Example 1

[0020] A high-resistance concrete material is composed of the following raw materials in parts by weight: 300 parts of cement, 30 parts of silica fume, 55 parts of heavy calcium powder, 58 parts of slag powder, 1000 parts of crushed stone, 730 parts of sand, 6 parts of fiber, 1 part of resistance agent, 0.3 parts of high-temperature terroir, 0.6 parts of polyurethane waterproofing agent, 0.8 parts of silicone waterproofing agent, and 120 parts of water.

[0021] The cement is ordinary Portland cement with a strength grade of 42.5 or above.

[0022] The average particle size of silica fume is 0.1 μm.

[0023] The slag powder is S95 grade slag powder.

[0024] The particle size of the crushed stone is 15 mm, the sand is medium sand, and the fineness modulus is 2.5.

[0025] The fiber is polypropylene fiber.

[0026] The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 31 parts of calcium oxide expansion clinker and 54 parts of fly ash evenly and grind them, and then add 5 parts of dextrin, 150 parts of water, 0.2 parts of water-soluble carbon dots and 0.03 parts of hydrotalcite and mix them evenly.

[0027] The hydrotalcite must be pre-treated by calcination before mixing, the calcination temperature is 500°C, and the calcination is carried out for 3 hours in a nitrogen atmosphere.

[0028] A method for preparing a high-resistance concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0029] Example 2

[0030] A high-resistance concrete material is composed of the following raw materials in parts by weight: 350 parts of cement, 35 parts of silica fume, 60 parts of heavy calcium powder, 50 parts of slag powder, 1080 parts of crushed stone, 800 parts of sand, 5 parts of fiber, 0.8 parts of resistance agent, 0.5 parts of high-temperature resistant concrete, 0.9 parts of polyurethane waterproofing agent, 1 part of silicone waterproofing agent, and 150 parts of water.

[0031] The cement is ordinary Portland cement with a strength grade of 42.5 or above.

[0032] The average particle size of silica fume is 0.15 μm.

[0033] The slag powder is S95 grade slag powder.

[0034] The particle size of the crushed stone is 20 mm, the sand is medium sand, and the fineness modulus is 2.7.

[0035] The fibers are steel fibers.

[0036] The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 28 parts of calcium oxide expansion clinker and 52 parts of fly ash evenly and grind them, then add 8 parts of dextrin, 200 parts of water, 0.5 parts of water-soluble carbon dots and 0.1 parts of hydrotalcite and mix them evenly.

[0037] The hydrotalcite must be pre-treated by calcination before mixing, the calcination temperature is 480°C, and the calcination is carried out for 2.5 hours in a nitrogen atmosphere.

[0038] A method for preparing a high-resistance concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0039] Example 3

[0040] A high-resistance concrete material is composed of the following raw materials in parts by weight: 400 parts of cement, 50 parts of silica fume, 80 parts of heavy calcium powder, 65 parts of slag powder, 1100 parts of crushed stone, 800 parts of sand, 10 parts of fiber, 1.5 parts of resistance agent, 0.8 parts of high-temperature terroir, 1.0 parts of polyurethane waterproofing agent, 1.5 parts of silicone waterproofing agent, and 150 parts of water.

[0041] The cement is ordinary Portland cement with a strength grade of 42.5 or above.

[0042] The average particle size of silica fume is 0.20 μm.

[0043] The slag powder is S95 grade slag powder.

[0044] The particle size of the crushed stone is 0.10 mm, the sand is medium sand, and the fineness modulus is 2.3.

[0045] The fiber is polypropylene fiber.

[0046] The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 35 parts of calcium oxide expansion clinker and 60 parts of fly ash evenly and grind them, then add 8 parts of dextrin, 200 parts of water, 0.3 parts of water-soluble carbon dots and 0.3 parts of hydrotalcite and mix them evenly.

[0047] The hydrotalcite must be pre-treated by calcination before mixing. The calcination temperature is 520° C. and the calcination time is 3.5 h in a nitrogen atmosphere.

[0048] A method for preparing a high-resistance concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0049] Example 4

[0050] A high-resistance concrete material is composed of the following raw materials in parts by weight: 380 parts of cement, 45 parts of silica fume, 70 parts of heavy calcium powder, 55 parts of slag powder, 1200 parts of crushed stone, 900 parts of sand, 10 parts of fiber, 1.5 parts of resistance agent, 0.5 parts of high-temperature terroir, 1.0 parts of polyurethane waterproofing agent, 1.0 parts of silicone waterproofing agent, and 140 parts of water.

[0051] The cement is ordinary Portland cement with a strength grade of 42.5 or above.

[0052] The average particle size of silica fume is 0.2 μm.

[0053] The slag powder is S95 grade slag powder.

[0054] The particle size of the crushed stone is 25 mm, the sand is medium sand, and the fineness modulus is 3.0.

[0055] The fiber is polypropylene fiber.

[0056] The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 38 parts of calcium oxide expansion clinker and 65 parts of fly ash evenly and grind them, then add 3 parts of dextrin, 100 parts of water, 0.4 parts of water-soluble carbon dots and 0.15 parts of hydrotalcite and mix them evenly.

[0057] The hydrotalcite must be pre-treated by calcination before mixing, the calcination temperature is 550°C, and the calcination is carried out for 3 hours in a nitrogen atmosphere.

[0058] A method for preparing a high-resistance concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0059] Comparative Example 1

[0060] A concrete material is composed of the following raw materials in parts by weight: 300 parts of cement, 30 parts of silica fume, 55 parts of heavy calcium powder, 58 parts of slag powder, 1000 parts of crushed stone, 730 parts of sand, 6 parts of polypropylene fiber, 0.3 parts of high-altitude land, 0.6 parts of polyurethane waterproofing agent, 0.8 parts of silicone waterproofing agent, and 120 parts of water.

[0061] A method for preparing a concrete material comprises the following steps: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3. Add the aggregate mixture and water obtained in step S1 into the mixer in step S2, and continue to stir evenly to obtain concrete material.

[0062] Comparative Example 2

[0063] A concrete material is composed of the following raw materials in parts by weight: 300 parts of cement, 30 parts of silica fume, 55 parts of heavy calcium powder, 58 parts of slag powder, 1000 parts of crushed stone, 730 parts of sand, 6 parts of polypropylene fiber, and 120 parts of water.

[0064] A method for preparing a concrete material comprises the following steps: S1. Mixing crushed stone, sand and fiber evenly to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly to obtain concrete material.

[0065] Comparative Example 3

[0066] A concrete material is composed of the following raw materials in parts by weight: 300 parts of cement, 30 parts of silica fume, 55 parts of heavy calcium powder, 58 parts of slag powder, 1000 parts of crushed stone, 730 parts of sand, 6 parts of polypropylene fiber, 1 part of resistance agent, and 120 parts of water.

[0067] The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; the preparation method of the resistance agent is to mix 31 parts of calcium oxide expansion clinker and 54 parts of fly ash evenly and grind them, and then add 5 parts of dextrin, 150 parts of water, 0.2 parts of water-soluble carbon dots and 0.03 parts of hydrotalcite and mix them evenly.

[0068] The hydrotalcite must be pre-treated by calcination before mixing, the calcination temperature is 500°C, and the calcination is carried out for 3 hours in a nitrogen atmosphere.

[0069] A method for preparing a concrete material comprises the following steps: S1. Mixing crushed stone, sand and fiber evenly to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

[0070] The concrete temperature stress tester was used to test the cracking temperature to evaluate the crack resistance of the concrete. The lower the cracking temperature, the better the crack resistance. The base ratio of concrete is shown in Table 1. Based on this ratio, the crack resistance of the concrete materials prepared in Examples 1-4 or Comparative Examples 1-3 was measured respectively.

[0071] Table 1 Concrete benchmark ratio (parts by weight)

[0072] The temperature rise of concrete and the strain value at 7d age (positive value indicates expansion) are shown in Table 2.

[0073] Table 2 Test results of concrete internal temperature and 7d strain value

[0074] The temperature rise results of Comparative Examples 1-3 and the benchmark ratio are relatively small, while Examples 1-4 reduce the early hydration rate of cement, which wins time for the heat dissipation inside the concrete, and effectively reduces the temperature rise inside the concrete, and can reduce the temperature rise compared with the comparative examples; the 7d strain value shows that the effective expansion value of the concrete materials prepared by Examples 1-4 is improved; the cracking temperature test results show that the concrete materials prepared by Examples 1-4 and Comparative Examples 1-3 can reduce the cracking temperature of concrete, but Comparative Examples 1-2 do not add resistance agents, so the cracking temperature reduction of Comparative Examples 1-2 is smaller than that of Comparative Examples 3 and Examples 1-4, and Examples 1-4 and Comparative Examples 3 both add resistance agents, and the anti-cracking effect is significantly improved.

[0075] The concrete prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in Table 3 below.

[0076] Table 3 Performance test results

[0077] It can be seen from the test results in Table 3 that the high-resistance concrete of the present invention has high strength and good sulfate erosion resistance and corrosion resistance, which is significantly better than the concrete in the comparative example. Comparative Examples 1-2 did not add resistance agents, so the corrosion resistance of Comparative Examples 1-2 was poor, and Comparative Examples 2-3 did not add high-resistance territories, polyurethane waterproofing agents, and silicone waterproofing agents, so the sulfate erosion resistance of Comparative Examples 2-3 was poor.

[0078] Therefore, the present invention adopts the above-mentioned high-resistance concrete material and its preparation method, and improves the crack resistance and resistance to external sulfate corrosion of concrete by adding resistance agents, high-density terroir, and polyurethane waterproofing agents. By adding silica fume, heavy calcium powder, slag powder, and fiber, the density and strength of concrete are improved, the generation of cracks is reduced, and the impact resistance of concrete is enhanced.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A high resistance concrete material, characterized in that: It is composed of the following raw materials in parts by weight: 300-400 parts of cement, 30-50 parts of silica fume, 50-100 parts of heavy calcium powder, 50-100 parts of slag powder, 1000-1200 parts of crushed stone, 700-900 parts of sand, 5-10 parts of fiber, 0.5-1.5 parts of anti-corrosion agent, 0.1-1 parts of high-altitude land, 0.5-1.5 parts of polyurethane waterproofing agent, 0.5-2 parts of silicone waterproofing agent and 100-150 parts of water.

2. A high resistance concrete material according to claim 1, characterized in that: The cement is ordinary Portland cement with a strength grade of 42.5 or above.

3. The high-resistance concrete material according to claim 1, characterized in that: The particle size of the silica fume is 0.1-0.3 μm.

4. The high-resistance concrete material according to claim 1, characterized in that: The slag powder is S95 grade slag powder.

5. The high-resistance concrete material according to claim 1, characterized in that: The particle size of the crushed stone is 5-25 mm, the sand is medium sand, and the fineness modulus is 2.3-3.

0.

6. The high-resistance concrete material according to claim 1, characterized in that: The fibers are polypropylene fibers or steel fibers.

7. The high-resistance concrete material according to claim 1, characterized in that: The resistance agent includes calcium oxide expansion clinker, dextrin, fly ash, hydrotalcite, water-soluble carbon dots and water; The preparation method of the resistance agent is to mix 28-40 parts of calcium oxide expansion clinker and 52-70 parts of fly ash evenly and grind them, and then add 2-8 parts of dextrin, 20-200 parts of water, 0.1-1 parts of water-soluble carbon dots and 0.01-1 parts of hydrotalcite and mix them evenly.

8. The high-resistance concrete material according to claim 7, characterized in that: The hydrotalcite must be pre-treated by calcination before mixing, the calcination temperature is 450-550°C, and the calcination is carried out for 2-5 hours in a nitrogen atmosphere.

9. A method for preparing a high-resistance concrete material according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Evenly mix crushed stone, sand, fiber, high-quality land, polyurethane waterproofing agent and silicone waterproofing agent to obtain an aggregate mixture; S2. Add cement, silica fume, heavy calcium powder and slag powder into a mixer and mix well; S3, adding the aggregate mixture obtained in step S1 into the mixer in step S2, and continuing to stir evenly; S4, adding the resistance agent to water, stirring evenly, to obtain a colloidal solution; S5. Add the colloidal solution obtained in step S4 into the mixer in step S3, stir evenly, and obtain high-resistance concrete.

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