Elastic bread brick and preparation method thereof

Abstract

The invention discloses an elastic bread brick and a preparation method thereof, and belongs to the technical field of bread bricks, the elastic bread brick is characterized by comprising a concrete brick, an elastic surface layer is compacted on the concrete brick, and the elastic surface layer is arranged on the concrete brick. The elastic surface layer is prepared from the following raw materials in parts by weight: 30 to 50 parts of rubber powder / fine sand, 20 to 40 parts of gravel, 30 to 50 parts of rubber particles, 20 to 40 parts of modified emulsified asphalt and 10 to 25 parts of water. The effect of solving the problem of poor elasticity of the existing bread brick is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bread bricks, in particular to an elastic bread brick and a preparation method thereof. Background Art

[0002] Bread bricks are a kind of pavement bricks with strong water absorption function. The preparation of pavement bricks is made of crushed stone as raw material, adding cement and adhesive admixtures, so that the pavement bricks have good water permeability, air permeability and water retention. At the same time, they have many functions such as cooling, noise reduction, climate regulation, improving air quality, and maintaining surface water circulation. Moreover, cotton packaging is a kind of wear-resistant bricks with small brick surface volume, simple brick body color, anti-slip, wear-resistant and easy repair characteristics. Nowadays, it is widely used in the renovation of urban sidewalks, stations, pedestrian streets, apartment parking lots, airports and other projects.

[0003] The strength, hardness and aesthetics of bread bricks can effectively replace hardened pavements made of cement and stone, but the elasticity of bread bricks is still poor, which affects the user experience. Summary of the invention

[0004] In order to solve the problem of poor elasticity of existing bread bricks, the present invention provides an elastic bread brick and a preparation method thereof.

[0005] The first aspect of the present invention is to provide an elastic bread brick, which adopts the following technical solution: An elastic bread brick comprises a concrete brick, on which an elastic surface layer is compacted, wherein the elastic surface layer comprises the following raw materials in parts by weight: 30-50 parts of rubber powder / fine sand, 20-40 parts of crushed stone, 30-50 parts of rubber particles, 20-40 parts of modified emulsified asphalt, and 10-25 parts of water.

[0006] By adopting the above technical scheme, the addition of rubber powder and rubber particles in the elastic surface layer can significantly improve the elasticity and shock absorption ability of the surface layer. At the same time, due to the different particle sizes of rubber powder and rubber particles, the anti-skid performance of the surface layer will not be affected. At the same time, the wear resistance of the surface layer can be improved to ensure the service life of the surface layer. In addition, the addition of crushed stone in the surface layer material can also ensure the strength and stability of the surface layer. Moreover, modified emulsified asphalt as a binder for crushed stone, rubber powder and rubber particles can make the raw materials in the surface layer tightly combined. At the same time, modified emulsified asphalt also has excellent waterproof performance, which can effectively prevent moisture from penetrating into the pavement structure layer. In addition, modified emulsified asphalt can also penetrate into concrete bricks, improve the bonding performance between the surface layer and concrete bricks, and ensure the service life of the surface layer.

[0007] Preferably, the rubber powder / fine sand is 35-45 parts, crushed stone is 30-35 parts, rubber particles are 35-45 parts, modified emulsified asphalt is 25-35 parts, and water is 10-25 parts.

[0008] Preferably, the particle size of the rubber powder is 20-80 mesh, and the particle size of the rubber particles is 2-4 mm.

[0009] Preferably, the modified emulsified asphalt comprises 65% SBS modified asphalt and 35% soap solution by weight percentage.

[0010] Preferably, the SBS modified asphalt comprises the following raw materials in weight percentage: 93% 90# asphalt, 5% SBS, and 2% extracted oil.

[0011] Preferably, the soap solution comprises the following raw materials in parts by weight: 3.0-3.6 parts of emulsifier, 0.8-1.5 parts of stabilizer, 2.0-3.0 parts of hydrochloric acid, and 340-345 parts of water.

[0012] Preferably, the elastic surface layer also includes 5-10 parts of anti-icing agent.

[0013] Preferably, the anti-icing agent is a mixture of 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder by weight.

[0014] The second aspect of the present invention is to provide a method for preparing the elastic bread bricks described above, comprising the following steps: mixing rubber powder or fine sand, crushed stone, rubber particles, water and modified emulsified asphalt, compacting and curing on concrete bricks to obtain elastic bread bricks.

[0015] In summary, the present invention has the following beneficial effects: The present application effectively improves the elasticity of the surface of the bread bricks and improves the comfort of the bread bricks by compacting the elastic surface layer on the concrete bricks. At the same time, the presence of crushed stone in the elastic surface layer of the present application makes the anti-skid performance of the elastic surface layer almost unchanged, while the elasticity is greatly increased. In addition, the anti-icing agent in the present application is a mixture of fly ash and calcium chloride and sodium chloride powder, which can effectively reduce the anti-icing performance of the elastic surface layer and improve the anti-skid performance of the bread bricks in winter, so that the bread bricks obtained by the present application can be widely used in squares, schools, parking lots, community greening, parks, family courtyards and other places.

[0016] The addition of modified emulsified asphalt in the present application will allow the emulsified asphalt to penetrate into the concrete brick body during the compaction of the surface layer mixture, thereby improving the bonding performance between the elastic surface layer and the concrete brick body and reducing the probability of detachment between the elastic surface layer and the concrete brick body. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the embodiments.

[0018] An elastic bread brick comprises a concrete brick, on which an elastic surface layer is compacted, wherein the elastic surface layer comprises the following raw materials in parts by weight: 30-50 parts of rubber powder / fine sand, 20-40 parts of crushed stone, 30-50 parts of rubber particles, 20-40 parts of modified emulsified asphalt, and 10-25 parts of water.

[0019] Preferably, the rubber powder / fine sand is 35-45 parts, crushed stone is 30-35 parts, rubber particles are 35-45 parts, modified emulsified asphalt is 25-35 parts, and water is 10-25 parts.

[0020] Preferably, the particle size of the rubber powder is 20-80 mesh, and the particle size of the rubber particles is 2-4 mm.

[0021] Preferably, the modified emulsified asphalt comprises 65% SBS modified asphalt and 35% soap solution by weight percentage. The particle charge of the modified emulsified asphalt obtained in the present application is cationic, the pH is 1.5-3, the standard viscosity is 10-60s, the average particle size is 2-6μm, the residue on the sieve is <0.1%, the surface drying time is 10-15min, the actual drying time is 30-40min, the tensile strength is ≥2.0MPa, the 5d stability is <5%, the mixing time with the rubber particles is <60s, and the evaporation residue indicators are as follows: content ≥65%, softening point >60℃, needle penetration (0.01mm) 40-100, elongation (5℃) >30cm, elastic recovery >90%.

[0022] Preferably, the SBS modified asphalt comprises the following raw materials in weight percentage: 93% 90# asphalt, 5% SBS, and 2% extracted oil.

[0023] Preferably, the soap solution comprises the following raw materials in parts by weight: 3.0-3.6 parts of emulsifier, 0.8-1.5 parts of stabilizer, 2.0-3.0 parts of hydrochloric acid, and 340-345 parts of water.

[0024] Preferably, the elastic surface layer also includes 5-10 parts of anti-icing agent.

[0025] Preferably, the anti-icing agent is a mixture of 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder by weight.

[0026] The present invention further provides a method for preparing the elastic bread bricks described above, comprising the following steps: mixing rubber powder or fine sand, crushed stone, rubber particles, water and modified emulsified asphalt, compacting and curing on concrete bricks to obtain the elastic bread bricks.

[0027] Unless otherwise specified, the raw materials used in this application can be commercially available.

[0028] Preparation Example 1 A method for preparing modified emulsified asphalt comprises the following steps: S1, SBS modified asphalt Heat 0.93kg of 90# asphalt to 160℃, add 0.05kg of SBS, stir evenly, continue to heat to 170℃, then add 0.02kg of extracted oil and stir evenly, then use a high-speed shearing machine to shear for 30min at 4500r / min at a temperature of 160-170℃, swell and stir for 2h at a temperature of 155℃ to obtain SBS modified asphalt and heat to 160-165℃ for use; S2. Soap solution preparation 0.03 kg of emulsifier (MQ3 asphalt emulsifier purchased from MeadWestvaco), 0.008 kg of stabilizer ((1→3)-β-D-glucan), 0.02 kg of hydrochloric acid (pH value at 60°C is 1.8-2.0), and 3.4 kg of water are mixed to obtain a soap solution and heated to 60-65°C for use; S3. Preparation of modified emulsified asphalt 0.65 kg of the SBS modified asphalt obtained in step S1 and 0.35 kg of the soap solution obtained in step S2 were emulsified using a colloid mill to obtain modified emulsified asphalt. The properties of the modified emulsified asphalt were as follows: the particle charge of the modified emulsified asphalt was cationic, the pH was 2.18, the standard viscosity was 22 s, the average particle size was 4.352 μm, the residue on the sieve was 0, the surface drying time was 11 min, the actual drying time was 35 min, the tensile strength was 2.23 MPa, the 5d stability was 0.16%, the mixing time with the rubber particles was 55 s, and the evaporation residue indicators were as follows: content 65.87%, softening point 67°C, needle penetration (0.01 mm) 80, elongation (5°C) 54 cm, and elastic recovery 94%.

[0029] Preparation Example 2 A method for preparing modified emulsified asphalt comprises the following steps: S1, SBS modified asphalt Heat 0.93kg of 90# asphalt to 160℃, add 0.05kg of SBS, stir evenly, continue to heat to 170℃, then add 0.02kg of extracted oil and stir evenly, then use a high-speed shearing machine to shear for 30min at 4500r / min at a temperature of 160-170℃, swell and stir for 2h at a temperature of 155℃ to obtain SBS modified asphalt and heat to 160-165℃ for use; S2. Soap solution preparation 0.033 kg of emulsifier (MQ3 asphalt emulsifier purchased from MeadWestvaco), 0.012 kg of stabilizer ((1→3)-β-D-glucan), 0.025 kg of hydrochloric acid (pH value at 60°C is 1.8-2.0), and 3.4 kg of water are mixed to obtain a soap solution and heated to 60-65°C for use; S3. Preparation of modified emulsified asphalt 0.65 kg of the SBS modified asphalt obtained in step S1 and 0.35 kg of the soap solution obtained in step S2 were emulsified using a colloid mill to obtain modified emulsified asphalt. The properties of the modified emulsified asphalt were as follows: the particle charge of the modified emulsified asphalt was cationic, the pH was 2.23, the standard viscosity was 22 s, the average particle size was 4.342 μm, the residue on the sieve was 0, the surface drying time was 12 min, the actual drying time was 34 min, the tensile strength was 2.24 MPa, the 5d stability was 0.15%, the mixing time with the rubber particles was 55 s, and the evaporation residue indicators were as follows: content 65.78%, softening point 68°C, needle penetration (0.01 mm) 82, elongation (5°C) 53 cm, and elastic recovery 95%.

[0030] Preparation Example 3 A method for preparing modified emulsified asphalt comprises the following steps: S1, SBS modified asphalt Heat 0.93kg of 90# asphalt to 160℃, add 0.05kg of SBS, stir evenly, continue to heat to 170℃, then add 0.02kg of extracted oil and stir evenly, then use a high-speed shearing machine to shear for 30min at 4500r / min at a temperature of 160-170℃, swell and stir for 2h at a temperature of 155℃ to obtain SBS modified asphalt and heat to 160-165℃ for use; S2. Soap solution preparation 0.036 kg of emulsifier (MQ3 asphalt emulsifier purchased from MeadWestvaco), 0.015 kg of stabilizer ((1→3)-β-D-glucan), 0.03 kg of hydrochloric acid (pH value at 60°C is 1.8-2.0), and 3.45 kg of water are mixed to obtain a soap solution and heated to 60-65°C for use; S3. Preparation of modified emulsified asphalt 0.65 kg of the SBS modified asphalt obtained in step S1 and 0.35 kg of the soap solution obtained in step S2 were emulsified using a colloid mill to obtain modified emulsified asphalt. The properties of the modified emulsified asphalt were as follows: the particle charge of the modified emulsified asphalt was cationic, the pH was 2.25, the standard viscosity was 23s, the average particle size was 4.336 μm, the residue on the sieve was 0, the surface dry time was 11 min, the actual drying time was 36 min, the tensile strength was 2.26 MPa, the 5d stability was 0.17%, the mixing time with the rubber particles was 56 s, and the evaporation residue indicators were as follows: content 65.73%, softening point 66°C, needle penetration (0.01 mm) 81, elongation (5°C) 55 cm, and elastic recovery 94%.

[0031] Example 1 A method for preparing an elastic bread brick comprises the following steps: S1. Prepare concrete bricks by mixing cement, sand, gravel and water in a ratio of 1:2.5:4:0.6 to form a mixture, and press it into shape using a brick pressing machine; S2, 0.3 kg of rubber powder with a particle size of 20 mesh, 0.2 kg of crushed stone with a gradation of 0-1.18 mm, and 0.3 kg of rubber particles with a particle size of 2-4 mm are stirred and mixed evenly, and then 0.1 kg of water is added and stirred evenly, and then 0.2 kg of the modified emulsified asphalt obtained in Preparation Example 1 is added and stirred for 10-20 seconds to obtain a mixture; S3. Pour the mixture obtained in step S2 into a mold, spread it on the concrete brick and compact it, and cure it to obtain an integrally formed bread brick.

[0032] Example 2 A method for preparing an elastic bread brick comprises the following steps: S1. Prepare concrete bricks by mixing cement, sand, gravel and water in a ratio of 1:2.5:4:0.6 to form a mixture, and press it into shape using a brick pressing machine; S2, 0.35 kg of rubber powder with a particle size of 20 mesh, 0.3 kg of crushed stone with a gradation of 0-1.18 mm, and 0.35 kg of rubber particles with a particle size of 2-4 mm are stirred and mixed uniformly, and then 0.15 kg of water is added and stirred uniformly, and then 0.25 kg of the modified emulsified asphalt obtained in Preparation Example 1 is added and stirred for 10-20 seconds to obtain a mixture; S3. Pour the mixture obtained in step S2 into a mold, spread it on the concrete brick and compact it, and cure it to obtain an integrally formed bread brick.

[0033] Example 3 A method for preparing an elastic bread brick comprises the following steps: S1. Prepare concrete bricks by mixing cement, sand, gravel and water in a ratio of 1:2.5:4:0.6 to form a mixture, and press it into shape using a brick pressing machine; S2, 0.4 kg of rubber powder with a particle size of 20 mesh, 0.3 kg of crushed stone with a gradation of 0-1.18 mm, and 0.4 kg of rubber particles with a particle size of 2-4 mm are stirred and mixed evenly, and then 0.15 kg of water is added and stirred evenly, and then 0.3 kg of the modified emulsified asphalt obtained in Preparation Example 1 is added and stirred for 10-20 seconds to obtain a mixture; S3. Pour the mixture obtained in step S2 into a mold, spread it on the concrete brick and compact it, and cure it to obtain an integrally formed bread brick.

[0034] Example 4 A method for preparing an elastic bread brick comprises the following steps: S1. Prepare concrete bricks by mixing cement, sand, gravel and water in a ratio of 1:2.5:4:0.6 to form a mixture, and press it into shape using a brick pressing machine; S2, 0.45 kg of rubber powder with a particle size of 20 mesh, 0.35 kg of crushed stone with a gradation of 0-1.18 mm, and 0.45 kg of rubber particles with a particle size of 2-4 mm are stirred and mixed evenly, and then 0.25 kg of water is added and stirred evenly, and then 0.35 kg of the modified emulsified asphalt obtained in Preparation Example 1 is added and stirred for 10-20 seconds to obtain a mixture; S3. Pour the mixture obtained in step S2 into a mold, spread it on the concrete brick and compact it, and cure it to obtain an integrally formed bread brick.

[0035] Example 5 A method for preparing an elastic bread brick comprises the following steps: S1. Prepare concrete bricks by mixing cement, sand, gravel and water in a ratio of 1:2.5:4:0.6 to form a mixture, and press it into shape using a brick pressing machine; S2, 0.5 kg of rubber powder with a particle size of 20 mesh, 0.4 kg of crushed stone with a gradation of 0-1.18 mm, and 0.5 kg of rubber particles with a particle size of 2-4 mm are stirred and mixed evenly, and then 0.25 kg of water is added and stirred evenly, and then 0.4 kg of the modified emulsified asphalt obtained in Preparation Example 1 is added and stirred for 10-20 seconds to obtain a mixture; S3. Pour the mixture obtained in step S2 into a mold, spread it on the concrete brick and compact it, and cure it to obtain an integrally formed bread brick.

[0036] Example 6 A method for preparing elastic bread bricks, which is different from Example 3 in that an equal amount of fine sand is used instead of rubber powder, and the rest is the same as Example 3.

[0037] Example 7 A method for preparing an elastic bread brick is different from Example 3 in that the modified emulsified asphalt uses the modified emulsified asphalt obtained in Preparation Example 2, and the rest is the same as Example 3.

[0038] Example 8 A method for preparing an elastic bread brick is different from that of Example 3 in that the modified emulsified asphalt adopts the modified emulsified asphalt obtained in Preparation Example 3, and the rest is the same as that of Example 3.

[0039] Example 9 A method for preparing elastic bread bricks, which is different from Example 3 in that the surface layer raw materials also include 0.05 kg of anti-icing agent, wherein the weight of the anti-icing agent is composed of 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder, and the rest are the same as Example 3.

[0040] Example 10 A method for preparing elastic bread bricks, which is different from Example 3 in that the surface layer raw materials also include 0.08 kg of anti-icing agent, wherein the weight of the anti-icing agent is composed of 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder, and the rest are the same as Example 3.

[0041] Embodiment 11 A method for preparing elastic bread bricks, which is different from Example 3 in that the surface layer raw materials also include 0.1 kg of anti-icing agent, wherein the weight of the anti-icing agent is composed of 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder, and the rest are the same as Example 3.

[0042] Comparative Example 1 A method for preparing elastic bread bricks, which is different from Example 3 in that the modified emulsified asphalt uses commercially available emulsified asphalt (solid content 60%, surface drying time 0.5h), and the rest is the same as Example 3.

[0043] Comparative Example 2 A method for preparing an elastic bread brick, which is different from Example 3 in that there are no rubber particles in the surface layer raw materials, and the rest are the same as Example 3.

[0044] Comparative Example 3 A method for preparing an elastic bread brick, which is different from Example 3 in that there is no rubber powder in the surface layer raw materials, and the rest is the same as Example 3.

[0045] Performance Testing The elastic bread bricks obtained in the above embodiments and comparative examples were tested for wear resistance and frost resistance. The test results are shown in Table 1, wherein the wear resistance test was carried out in accordance with the relevant provisions of GB / T28635-2012 "Concrete Pavement Bricks", and the frost resistance test was carried out at minus 15°C. After water was sprayed on the surface of the brick body, the freezing time was calculated, and the elastic performance was determined by the vertical deformation detection method in the physical and mechanical properties of cast-in-place and prefabricated surface layers in GB36246-2018 "New National Standard Plastic Runway".

[0046] Table 1 Elastic Bread Brick Performance Test Results From the table above we can see that: The elastic bread bricks obtained in the embodiments of the present application have a wear resistance length less than 14.5 mm, a freezing time greater than 60 min at minus 15°C, and a vertical deformation greater than or equal to 2.5 mm, indicating that the combined use of various substances in the surface layer raw materials of the present application can effectively improve the elastic properties of the bread bricks while also helping to improve the wear resistance and anti-freezing time of the bread bricks.

[0047] Compared with Example 3 of the present application, when commercially available emulsified asphalt is used, the wear resistance length of the bread brick increases and the wear resistance decreases. At the same time, the freezing time and the degree of vertical deformation are also significantly reduced compared with Example 6. It can be seen that the combined use of the various components in the modified emulsified asphalt in the present application effectively ensures the elasticity, wear resistance and anti-icing performance of the bread brick surface layer.

[0048] Compared with Example 2, in Comparative Example 2-3, when there is a lack of rubber particles or rubber powder in the surface layer raw materials, the wear resistance length of the bread brick is much longer than the wear resistance length in Example 2, and the degree of vertical deformation is much lower than the degree of deformation in Example 2, which shows that the combination of rubber powder and rubber particles not only affects the elasticity of the bread brick surface layer, but also ensures the uniformity and stability of the surface layer, thereby effectively improving the wear resistance of the surface layer.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An elastic bread brick, comprising a concrete brick, characterized in that: An elastic surface layer is compacted on the concrete brick, and the elastic surface layer comprises the following raw materials in parts by weight: 30-50 parts of rubber powder / fine sand, 20-40 parts of crushed stone, 30-50 parts of rubber particles, 20-40 parts of modified emulsified asphalt, and 10-25 parts of water.

2. The elastic bread brick according to claim 1, characterized in that: The rubber powder / fine sand is 35-45 parts, crushed stone is 30-35 parts, rubber particles are 35-45 parts, modified emulsified asphalt is 25-35 parts, and water is 10-25 parts.

3. The elastic bread brick according to claim 1 or 2, characterized in that: The particle size of the rubber powder is 20-80 meshes, and the particle size of the rubber particles is 2-4 mm.

4. The elastic bread brick according to claim 1 or 2, characterized in that: The modified emulsified asphalt comprises 65% SBS modified asphalt and 35% soap solution by weight percentage.

5. The elastic bread brick according to claim 4, characterized in that: The SBS modified asphalt comprises the following raw materials in weight percentage: 93% 90# asphalt, 5% SBS, and 2% extracted oil.

6. The elastic bread brick according to claim 4, characterized in that: The soap solution comprises the following raw materials in parts by weight: 3.0-3.6 parts of emulsifier, 0.8-1.5 parts of stabilizer, 2.0-3.0 parts of hydrochloric acid, and 340-345 parts of water.

7. The elastic bread brick according to claim 1, characterized in that: The elastic surface layer also includes 5-10 parts of anti-icing agent.

8. The elastic bread brick according to claim 7, characterized in that: The anti-icing agent is prepared by mixing 40% fly ash, 55% calcium chloride powder and 5% sodium chloride powder by weight.

9. A method for preparing the elastic bread brick according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing rubber powder or fine sand, crushed stone, rubber particles, water and modified emulsified asphalt, compacting the mixture on concrete bricks and curing the mixture to obtain elastic bread bricks.

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