Environment-friendly green high-performance concrete and preparation method thereof

Abstract

The invention provides environment-friendly green high-performance concrete and a preparation method thereof, and relates to the technical field of concrete preparation. The environment-friendly green high-performance concrete is prepared from 50-80 parts of building waste, 25-33 parts of water, 20-26 parts of machine-made sand, 4-10 parts of silica fume, 13-23 parts of nano silicon dioxide, 18-30 parts of gravel, 30-50 parts of river sand, 5-10 parts of a binder, 7-15 parts of an air entraining agent, 8-13 parts of an expanding agent and 5-16 parts of a waterproof agent. According to the raw materials, various protective agents are added in the stirring process of the concrete raw materials, the strength of concrete can be improved, waste concrete blocks in industrial solid waste are recycled, the environment-friendly effect can be achieved, and the situation that the environment and the appearance are affected due to long-time accumulation is avoided; the concrete block waste is recycled, so that not only can the environment be protected, but also resources can be saved.

Description

Technical Field

[0001] This invention relates to the field of concrete preparation technology, specifically to an environmentally friendly, green, high-performance concrete and its preparation method. Background Technology

[0002] Concrete is one of the most widely used building materials in the field of civil engineering. With the increasing demands on concrete performance under different working conditions, ultra-high performance concrete has gradually emerged in special engineering construction. Ultra-high performance concrete is a type of concrete with high strength, high toughness, and high durability, and has received widespread attention both domestically and internationally, with broad application prospects.

[0003] When applying for this invention, the applicant, through a search, discovered a Chinese patent disclosing a "low-carbon, environmentally friendly ultra-high performance concrete and its preparation method," application number "202311324388.6." This patent, compared to traditional ultra-high performance concrete, significantly reduces the amount of cement, silica fume, and other cementitious materials, as well as the amount of fiber, while still maintaining excellent mechanical and durability properties. However, the method does not address the issue of air bubbles generated during the mixing of raw materials. These air bubbles occupy the effective surface area of ​​the hardened concrete, reducing the bonding area between cement paste and aggregate, and potentially lowering the concrete's strength. Therefore, based on the applicant's invention, an environmentally friendly, green, high-performance concrete has been developed, solving the problem of air bubbles generated during concrete production. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an environmentally friendly, green, high-performance concrete that solves the problem of air bubbles generated during the concrete production process.

[0005] Technical solution To achieve the above objectives, the present invention is implemented through the following technical solution: an environmentally friendly green high-performance concrete, comprising the following raw materials in parts by weight: 50-80 parts of construction waste, 25-33 parts of water, 20-26 parts of manufactured sand, 4-10 parts of silica fume, 13-23 parts of nano silica, 18-30 parts of crushed stone, 30-50 parts of river sand, 5-10 parts of binder, 7-15 parts of air-entraining agent, 8-13 parts of expansion agent, and 5-16 parts of waterproofing agent.

[0006] Preferably, the adhesive is at least one of epoxy resin, silicone adhesive, polyvinyl acetate, and AE acrylate adhesive.

[0007] Preferably, the air-entraining agent is rosin soap.

[0008] Preferably, the expanding agent is calcium sulfoaluminate.

[0009] Preferably, the waterproofing agent is a waterproofing agent.

[0010] Preferably, the crushed stone has a particle size of 5-25 mm, and the water is tap water.

[0011] Preferably, it includes the following steps: Step 1: Crush, grind and screen the construction solid waste to obtain coarse aggregate and fine aggregate; Step 2: Mix water, manufactured sand, silica fume, nano silica, crushed stone, and river sand, and stir evenly to obtain a mixture; Step 3: Mix the adhesive, air-entraining agent, expanding agent, waterproofing agent, and water to obtain a mixture; Step 4: Mix the mixture from Step 3 with the mixture from Step 2. Step 5: Add the coarse and fine aggregates to the mixture from Step 4, stir well, and obtain a slurry; Step 6: Pour the slurry from Step 5 into a mold and cure it for 7 to 28 days at a temperature of 20±2℃ and a humidity of 80% to 95% to obtain high-performance environmentally friendly concrete.

[0012] Preferably, the raw materials mixed in step 6 are molded, and finally demolded and cured to obtain the target product; In step 1, a crusher is used to crush the aggregate, and then the aggregate is ground. Coarse aggregate is screened using a 3-8 mesh sieve with a screen aperture of 5-25 mm, and fine aggregate is screened using a 4-100 mesh sieve with a screen aperture of 0.15-4.75 mm. The stirring time in step 2 is 5-8 minutes; The stirring time in step 3 is 10-17 minutes.

[0013] Beneficial effects This invention provides an environmentally friendly, green, high-performance concrete. It has the following beneficial effects: This invention adds an air-bubbling agent to the raw materials for concrete production. Silica fume is added to the raw materials during production to fill micropores, reducing residual air bubbles and ensuring the strength of the concrete.

[0014] This invention improves freeze resistance by adding an air-entraining agent during the production process to introduce microbubbles.

[0015] This invention utilizes slag silicate cement as a substitute for cement, achieving an environmentally friendly effect. It enables the recycling of industrial solid waste, protects the environment, and prevents the long-term accumulation of industrial solid waste that could otherwise cause environmental damage.

[0016] This invention adds an expansion agent during the mixing process of raw materials. After the expansion agent is mixed with the raw materials, the concrete is molded and cured to obtain the desired product, which can compensate for shrinkage and prevent cracking. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: This invention provides an environmentally friendly, green, high-performance concrete, comprising the following raw materials in parts by weight: 80 parts construction waste, 33 parts water, 26 parts manufactured sand, 10 parts silica fume, 23 parts nano silica, 30 parts crushed stone, 50 parts river sand, 10 parts binder, 15 parts air-entraining agent, 13 parts expansion agent, and 16 parts waterproofing agent.

[0019] The adhesive is at least one of epoxy resin, silicone adhesive, polyvinyl acetate, and AE acrylate adhesive. The adhesive imparts strength, durability, and integrity to the concrete. The air-entraining agent is rosin soap, which significantly improves the durability, workability, and freeze-thaw resistance of the concrete by introducing a large number of uniformly distributed microbubbles (10-300μm in diameter). The expanding agent is calcium sulfoaluminate, mainly used to compensate for shrinkage during the concrete hardening process, prevent cracking, and improve the durability and density of the structure. The waterproofing agent primarily enhances the impermeability and durability of the concrete, thereby preventing the intrusion of moisture and harmful ions (such as chloride ions and sulfates). The crushed stone has a particle size of 5-25mm. The water is tap water. The construction waste is discarded concrete blocks, which can be recycled to avoid long-term accumulation that affects the environment and aesthetics. Recycling concrete block waste not only protects the environment but also saves resources.

[0020] Includes the following steps: Step 1: Crush, grind and screen the construction solid waste to obtain coarse aggregate and fine aggregate; Step 2: Mix water, manufactured sand, silica fume, nano silica, crushed stone, and river sand, stir evenly to obtain a mixture, and stir at a speed of 20 rpm for 1 hour; Step 3: Mix the adhesive, air-entraining agent, expanding agent, waterproofing agent and water to obtain a mixture. Stir at 10 rpm for 2 hours. Step 4: Mix the mixture from Step 3 with the mixture from Step 2, stirring at 20 rpm for 3 hours; Step 5: Add the coarse and fine aggregates to the mixture from Step 4, stir well, and obtain a slurry; Step 6: Pour the slurry from Step 5 into a mold and cure it for 7 to 28 days at a temperature of 20±2℃ and a humidity of 80% to 95% to obtain high-performance environmentally friendly concrete.

[0021] The raw materials mixed in step 6 are molded, and finally demolded and cured to obtain the desired product. In step 1, a crusher is used to crush the aggregate, and then the aggregate is ground. Coarse aggregate is screened using a 3-8 mesh sieve with a screen aperture of 5-25 mm, and fine aggregate is screened using a 4-100 mesh sieve with a screen aperture of 0.15-4.75 mm. The stirring time in step 2 is 5-8 minutes; The stirring time in step 3 is 10-17 minutes.

[0022] Example 2: The raw materials include the following parts by weight: 60 parts construction waste, 28 parts water, 23 parts manufactured sand, 6 parts silica fume, 18 parts nano silica, 24 parts crushed stone, 40 parts river sand, 7 parts binder, 9 parts air-entraining agent, 9 parts expanding agent, and 8 parts waterproofing agent.

[0023] Includes the following steps: Step 1: Crush, grind and screen the construction solid waste to obtain coarse aggregate and fine aggregate; Step 2: Mix water, manufactured sand, silica fume, nano silica, crushed stone, and river sand, stir evenly to obtain a mixture, and stir at a speed of 20 rpm for 1 hour; Step 3: Mix the adhesive, air-entraining agent, expanding agent, waterproofing agent and water to obtain a mixture. Stir at 10 rpm for 2 hours. Step 4: Mix the mixture from Step 3 with the mixture from Step 2, stirring at 20 rpm for 3 hours; Step 5: Add the coarse and fine aggregates to the mixture from Step 4, stir well, and obtain a slurry; Step 6: Pour the slurry from Step 5 into a mold and cure it for 7 to 28 days at a temperature of 20±2℃ and a humidity of 80% to 95% to obtain high-performance environmentally friendly concrete.

[0024] Example 3: The raw materials include the following parts by weight: 50 parts construction waste, 25 parts water, 20 parts manufactured sand, 4 parts silica fume, 13 parts nano silica, 18 parts crushed stone, 30 parts river sand, 5 parts binder, 7 parts air-entraining agent, 8 parts expansion agent, and 5 parts waterproofing agent.

[0025] Includes the following steps: Step 1: Crush, grind and screen the construction solid waste to obtain coarse aggregate and fine aggregate; Step 2: Mix water, manufactured sand, silica fume, nano silica, crushed stone, and river sand, stir evenly to obtain a mixture, and stir at a speed of 20 rpm for 1 hour; Step 3: Mix the adhesive, air-entraining agent, expanding agent, waterproofing agent and water to obtain a mixture. Stir at 10 rpm for 2 hours. Step 4: Mix the mixture from Step 3 with the mixture from Step 2, stirring at 20 rpm for 3 hours; Step 5: Add the coarse and fine aggregates to the mixture from Step 4, stir well, and obtain a slurry; Step 6: Pour the slurry from Step 5 into a mold and cure it for 7 to 28 days at a temperature of 20±2℃ and a humidity of 80% to 95% to obtain high-performance environmentally friendly concrete.

[0026] After the concrete is poured, the concrete slump test data table is compiled. Data table of air bubbles generated on the surface of concrete during mixing in the concrete production process. By comparing Examples 1, 2, and 3, it was found that adding binder, air-entraining agent, expanding agent, and waterproofing agent can effectively produce high-strength concrete. Furthermore, when a large amount of foaming agent is added, the proportion of bubbles generated during the mixing of concrete raw materials decreases as the mixing time increases.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly, green, high-performance concrete, characterized in that: The raw materials include the following parts by weight: 50-80 parts construction waste, 25-33 parts water, 20-26 parts manufactured sand, 4-10 parts silica fume, 13-23 parts nano silica, 18-30 parts crushed stone, 30-50 parts river sand, 5-10 parts binder, 7-15 parts air-entraining agent, 8-13 parts expanding agent, and 5-16 parts waterproofing agent.

2. The environmentally friendly green high-performance concrete according to claim 1, characterized in that: The adhesive is at least one of epoxy resin, silicone adhesive, polyvinyl acetate, and AE acrylate adhesive.

3. The environmentally friendly green high-performance concrete according to claim 1, characterized in that: The air-entraining agent is rosin soap.

4. The environmentally friendly green high-performance concrete according to claim 1, characterized in that: The expanding agent is calcium sulfoaluminate.

5. The environmentally friendly green high-performance concrete according to claim 1, characterized in that: The waterproofing agent is a waterproofing agent.

6. The environmentally friendly green high-performance concrete according to claim 1, characterized in that: The crushed stone has a particle size of 5-25mm, and the water is tap water.

7. An environmentally friendly green high-performance concrete and its preparation method according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1: Crush, grind and screen the construction solid waste to obtain coarse aggregate and fine aggregate; Step 2: Mix water, manufactured sand, silica fume, nano silica, crushed stone, and river sand, and stir evenly to obtain a mixture; Step 3: Mix the adhesive, air-entraining agent, expanding agent, waterproofing agent, and water to obtain a mixture; Step 4: Mix the mixture from Step 3 with the mixture from Step 2; Step 5: Add the coarse and fine aggregates to the mixture from Step 4, stir well, and obtain a slurry; Step 6: Pour the slurry from Step 5 into a mold and cure it for 7 to 28 days at a temperature of 20±2℃ and a humidity of 80% to 95% to obtain high-performance environmentally friendly concrete.

8. The environmentally friendly green high-performance concrete and its preparation method according to any one of claims 7, characterized in that: The raw materials mixed in step 6 are molded, and finally demolded and cured to obtain the desired product. In step 1, a crusher is used to crush the aggregate, and then the aggregate is ground. Coarse aggregate is screened using a 3-8 mesh sieve with a screen aperture of 5-25 mm, and fine aggregate is screened using a 4-100 mesh sieve with a screen aperture of 0.15-4.75 mm. The stirring time in step 2 is 5-8 minutes; The stirring time in step 3 is 10-17 minutes.