Biomass steel slag water permeable brick and preparation method thereof

Abstract

The invention relates to the technical field of water permeable bricks, in particular to a biomass steel slag water permeable brick and a preparation method thereof.The biomass steel slag water permeable brick is prepared from, by weight, 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 part of straw powder and 4-6 parts of water; the preparation method comprises the following steps: (1) mixing the cement, the fine aggregate and the straw powder to obtain a mixture; (2) mixing the mixture obtained in the step (1) with coarse aggregate to obtain a mixture, and adding water into the mixture to obtain mixed slurry; and (3) injecting the mixed slurry obtained in the step (2) into a mold, carrying out vibration compression molding, and curing to obtain the biomass steel slag water permeable brick. The biomass steel slag water permeable brick prepared by the invention is excellent in water permeability and compressive strength.

Description

Technical Field

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

[0002] Permeable bricks are a type of building material with high water permeability. They allow rainwater to penetrate into the ground through the bricks, thereby reducing the risk of urban waterlogging, replenishing groundwater resources, and improving the ecological environment. The main features and uses of permeable bricks include: (1) Permeable bricks can regulate local temperature and humidity, reduce temperature and increase air humidity, and optimize air quality; (2) The paving of permeable bricks has good moisture retention and water permeability, which helps to improve soil and water conservation rate, improve the living conditions of underground animals and microorganisms, and improve the soil living environment of plant roots; (3) Permeable bricks can absorb some of the noise generated by vehicles, providing a relatively quiet and comfortable environment. At the same time, the tiny protrusions on the brick surface can also absorb the reflection of the road surface, providing people with a higher quality, comfortable and safe sound and light environment; (4) Because the permeable pavement is permeable, the road surface will not accumulate water and slip after rain or snow, which increases the safety of citizens; (5) Permeable bricks can reduce the pressure of urban drainage and flood control, have a good effect on preventing pollution of public waters and treating sewage, and prevent water accumulation on the road, which is of great significance to the construction of sponge cities. At present, permeable bricks are generally laid on sidewalks, outdoor parking lots, outdoor tennis courts, basketball courts, athletic fields and other places.

[0003] With the advancement of sponge cities, the industry's requirements for permeable ecological pavement materials are getting higher and higher. Patent CN109626896 A discloses a permeable brick, which includes a surface material and a bottom material from top to bottom, wherein the surface material includes a surface material, a surface water reducer and a surface water, and the surface material includes the following components by weight: 5-30 parts of cement; 65-90 parts of the first steel slag; 1-10 parts of stone chips; the amount of the surface water reducer added is appropriate; the amount of the surface water added is appropriate; the bottom material includes a bottom material, a bottom water reducer and a bottom water, and the bottom material includes the following components by weight: 5-30 parts of cement; 65-90 parts of the second steel slag; 1-10 parts of stone chips; the amount of the bottom water reducer added is appropriate; the amount of the bottom water added is appropriate. The permeable bricks thus obtained have better compressive strength, but poor water permeability.

[0004] Therefore, there is an urgent need to provide a method for preparing a permeable brick with good water permeability. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a biomass slag permeable brick and a preparation method thereof, so as to solve the problem of poor water permeability of the permeable brick in the prior art.

[0006] To achieve the above objectives and other related objectives, the present invention is achieved through the following technical solutions.

[0007] The first aspect of the present invention is to provide a biomass slag permeable brick, comprising the following raw materials in parts by weight: 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 parts of straw powder, and 4-6 parts of water.

[0008] The second aspect of the present invention is to provide a method for preparing biomass slag permeable bricks, comprising the following steps:

[0009] (1) mixing cement, fine aggregate and straw powder to obtain a mixture;

[0010] (2) mixing the mixture obtained in step (1) with coarse aggregate to obtain a mixture, and adding water to the mixture to obtain a mixed slurry;

[0011] (3) injecting the mixed slurry obtained in step (2) into a mold, vibrating and pressing the mold, and curing the mold to obtain a biomass slag permeable brick.

[0012] As described above, the biomass slag permeable brick and the preparation method thereof of the present invention have the following beneficial effects:

[0013] (1) The biomass steel slag permeable brick of the present invention is made by adding straw and steel slag. The steel slag has the advantages of high hardness, good wear resistance and low price. The biomass straw is degradable and has anti-blocking function. As the permeable brick is used for a long time, the water permeability will decrease relatively. However, the straw can be degraded by itself, which is convenient for delaying the process of blockage of the internal gap of the brick, and the water permeability coefficient loss rate is low.

[0014] (2) The biomass slag permeable bricks of the present invention have strengths above the standard requirements, and have qualified performance. In addition, slag and stone powder are used as aggregates, so the cost is relatively low. DETAILED DESCRIPTION

[0015] In order to make the purpose of the invention, technical solutions and beneficial technical effects of the present invention clearer, the present invention is further described in detail below in conjunction with embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0016] The first aspect of the present invention is to provide a biomass slag permeable brick, comprising the following raw materials in parts by weight: 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 parts of straw powder, and 4-6 parts of water.

[0017] During use, permeable bricks age due to factors such as ultraviolet radiation, temperature changes, and chemical reactions. During use, dust, grease, and other substances may clog the gaps in the permeable bricks, reducing the water infiltration channels. In addition, the permeable bricks are subjected to external forces such as traffic loads for a long time, which may cause the internal structure of the permeable bricks to become dense, thereby reducing the porosity of the permeable bricks and causing disconnection between adjacent pores. The inventors of the present application have found through experiments that by introducing straw when preparing permeable bricks, the straw has a degradable function. As the service life increases, the permeability decreases less, and the loss rate of the permeability coefficient is relatively low. In addition, the introduction of coarse aggregate and fine aggregate, the fine aggregate is filled in the pores formed by the coarse aggregate, reducing the size of the pore size, dividing a large hole into multiple small holes, and the multiple small holes are interconnected. The small holes help to reduce stress concentration and crack expansion inside the permeable bricks, thereby facilitating the increase of the permeability coefficient of the permeable bricks while meeting the strength of the permeable bricks.

[0018] Steel slag, as a solid waste produced during steelmaking, has the characteristics of high hardness, good wear resistance and low price; biomass straw, as agricultural waste, is often piled up and burned, which has an adverse impact on the environment. Straw, as a biomass material, has degradable properties. The application and development of solid waste such as steel slag and straw can effectively turn waste into treasure, reduce environmental pollution, and reduce production costs.

[0019] The present invention uses steel slag aggregate as a coarse aggregate support and mixes it with cement, water, fine aggregate and straw powder in a certain ratio, so that the steel slag aggregate and the fine aggregate are bonded, and the whole brick produces a continuous network pore structure. The holes produced by this structure are evenly distributed and have large pore diameters. It is a super-high permeability permeable pavement brick with fully connected holes. The cement used only plays a role in bonding these particles, and cannot fill these network holes. Therefore, the permeable bricks produced have better compressive strength and water permeability.

[0020] In some embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 parts of straw powder, and 4-6 parts of water.

[0021] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 12-13.7 parts of cement, 70-77.15 parts of coarse aggregate, 5-7.4 parts of fine aggregate, 0.3-0.40 parts of straw powder, and 4-5 parts of water.

[0022] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 13.7-15 parts of cement, 77.15-78 parts of coarse aggregate, 7.4-7.85 parts of fine aggregate, 0.40-0.45 parts of straw powder, and 5-6 parts of water.

[0023] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 15-18 parts of cement, 77.15-78 parts of coarse aggregate, 7.85-10 parts of fine aggregate, 0.40-0.45 parts of straw powder, and 5-6 parts of water.

[0024] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 12 parts of cement, 70 parts of coarse aggregate, 5 parts of fine aggregate, 0.3 parts of straw powder, and 4 parts of water.

[0025] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 13.7 parts of cement, 77.15 parts of coarse aggregate, 7.4 parts of fine aggregate, 0.4 parts of straw powder, and 5 parts of water.

[0026] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 15 parts of cement, 77.15 parts of coarse aggregate, 7.85 parts of fine aggregate, 0.45 parts of straw powder, and 5.5 parts of water.

[0027] In some specific embodiments of the present invention, the biomass slag permeable brick comprises the following raw materials in parts by weight: 18 parts of cement, 78 parts of coarse aggregate, 10 parts of fine aggregate, 0.45 parts of straw powder, and 6 parts of water.

[0028] The biomass slag water-permeable brick of the present invention is prepared by compounding multiple components including cement, coarse aggregate, fine aggregate, straw powder and water. The proportions of the multiple components are adjusted and optimized, so that the biomass slag water-permeable brick prepared thereby has better performance.

[0029] In some embodiments of the present invention, the straw powder is selected from one or more of corn stalks, wheat stalks and rice straw. The present invention has no particular limitation on the source of the straw, and commercially available straw powder products commonly used by those skilled in the art can be used.

[0030] In some embodiments of the present invention, the particle size of the straw powder is 0.05-0.8 mm. Specifically, the particle size specifications of the straw powder include 0.05-0.1 mm, 0.1-0.4 mm, 0.4-0.5 mm, and 0.5-0.8 mm; further preferably, the straw powder is composed of particles with a particle size of 0.05-0.1 mm, particles with a particle size of 0.1-0.4 mm, particles with a particle size of 0.4-0.5 mm, and particles with a particle size of 0.5-0.8 mm in a mass ratio of (2-3): (5-6): (1-2): (5-6).

[0031] In some embodiments of the present invention, the cement is ordinary Portland cement. The present invention has no special limitation on the source of ordinary Portland cement, and commercially available products of ordinary Portland cement commonly used by those skilled in the art can be used.

[0032] In some embodiments of the present invention, the coarse aggregate is steel slag aggregate; the particle size of the steel slag aggregate is 5-12 mm, preferably, the particle size specifications of the steel slag aggregate include 5-8 mm, 8-10 mm, and 10-12 mm; specifically, the steel slag aggregate is composed of particles with a particle size of 5-8 mm, particles with a particle size of 8-10 mm, and particles with a particle size of 10-12 mm in a mass ratio of (1-2): (5-6): (7-8). The present invention does not specifically limit the source of the steel slag aggregate, and commercially available products of steel slag aggregate commonly used by those skilled in the art can be used. The steel slag aggregate is selected from electric furnace steel slag or converter steel slag.

[0033] In some embodiments of the present invention, the fine aggregate is stone powder, and the particle size of the stone powder is 2-4 mm.

[0034] The second aspect of the present invention is to provide a method for preparing the biomass slag permeable brick, comprising the following steps:

[0035] (1) mixing cement, fine aggregate and straw powder to obtain a mixture;

[0036] (2) mixing the mixture obtained in step (1) with coarse aggregate to obtain a mixture, and adding water to the mixture to obtain a mixed slurry;

[0037] (3) injecting the mixed slurry obtained in step (2) into a mold, vibrating and pressing the mold, and curing the mold to obtain a biomass slag permeable brick.

[0038] In some embodiments of the present invention, the molding pressure in step (3) is 5-10 MPa.

[0039] In some embodiments of the present invention, the compressive strength of the biomass slag permeable brick in step (3) is ≥40MPa, and the water permeability coefficient is ≥2.0*10 -2 cm / s.

[0040] In some embodiments of the present invention, the curing temperature in step (3) is 20-30° C., the curing time is 7-10 days, and the curing humidity is 60-70%.

[0041] The present invention is further described below by way of examples, but the scope of the present invention is not limited thereto.

[0042] When the embodiment gives a numerical range, it should be understood that, unless otherwise specified in the present invention, the two endpoints of each numerical range and any numerical value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by those skilled in the art. If specific conditions are not specified in the embodiment, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for all reagents or instruments, they are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, according to the grasp of the prior art by those skilled in the art and the record of the present invention, any method, equipment, and material of the prior art similar or equivalent to the method, equipment, and material in the embodiments of the present invention can also be used to realize the present invention.

[0043] Table 1 Raw material composition ratio of biomass slag permeable bricks of Examples 1-5 and Comparative Examples 1-2

[0044]

[0045]

[0046] Example

[0047] Example 1

[0048] The raw material composition ratio of the biomass steel slag permeable brick of this embodiment is shown in Table 1, wherein the cement is ordinary Portland cement; the coarse aggregate is steel slag aggregate, and the manufacturer of the steel slag aggregate is Baosteel Co., Ltd.; the steel slag aggregate is composed of particles with a particle size of 5-8mm, particles with a particle size of 8-10mm, and particles with a particle size of 10-12mm in a mass ratio of 1:5:8, the fine aggregate is stone powder, and the straw powder is corn stalks, and the straw powder is composed of particles with a particle size of 0.05-0.1mm, particles with a particle size of 0.1-0.4mm, particles with a particle size of 0.4-0.5mm, and particles with a particle size of 0.5-0.8mm in a mass ratio of 2:5:1:6. The manufacturer of the straw powder is Nanchong Xinmei New Fireproof Building Materials Co., Ltd.

[0049] The preparation method of the biomass slag permeable brick of this embodiment comprises the following steps:

[0050] (1) mixing cement, fine aggregate and straw powder to obtain a mixture;

[0051] (2) mixing the mixture obtained in step (1) with coarse aggregate to obtain a mixture, and adding water to the mixture to obtain a mixed slurry;

[0052] (3) Inject the mixed slurry obtained in step (2) into a mold, vibrate and shape it, and cure it to obtain a biomass slag permeable brick. The molding pressure is 8Mpa, the curing temperature is 25°C, the curing time is 8 days, and the curing humidity is 65%.

[0053] Example 2

[0054] The biomass slag permeable bricks of this embodiment have a raw material composition ratio as shown in Table 1. The difference from Embodiment 1 is that the raw material composition ratio is different.

[0055] Example 3

[0056] The biomass slag permeable bricks of this embodiment have a raw material composition ratio as shown in Table 1. The difference from Embodiment 1 is that the raw material composition ratio is different.

[0057] Example 4

[0058] The biomass slag permeable bricks of this embodiment have a raw material composition ratio as shown in Table 1. The difference from Embodiment 1 is that the raw material composition ratio is different.

[0059] Comparative Example

[0060] Comparative Example 1

[0061] The permeable bricks of this comparative example are different from those of Example 1 in that straw powder is not added and the proportions of the raw material components are different.

[0062] Comparative Example 2

[0063] The permeable bricks of this comparative example are different from those of Example 1 in that straw powder is not added and the proportions of the raw material components are different.

[0064] Comparative Example 3

[0065] The permeable bricks in this comparative example are different from those in Example 2 in that the proportions of the raw material components are different.

[0066] Performance Testing

[0067] Compressive strength test: The biomass slag permeable bricks of Examples 1-4 and Comparative Examples 1-3 were tested for compressive strength according to the test method in GB28635-2012 "Concrete Pavement Bricks". The test results are shown in Table 2.

[0068] Permeability coefficient test: The biomass slag permeable bricks of Examples 1-4 and Comparative Examples 1-3 were used to test the permeability coefficient of the permeable bricks according to the test method in GB / T25993-2010 "Standard for Permeable Pavement Bricks and Permeable Road Panels". The test results are shown in Table 2.

[0069] Permeability loss rate test: The biomass slag permeable bricks of Examples 1-5 and Comparative Examples 1-3 were used to test the permeability loss rate of the permeable bricks according to the test method in T / CECS10319-2023 "Steel Slag Permeable Concrete Bricks". The test results are shown in Table 2.

[0070] Table 2 Performance test results of biomass slag permeable bricks of Examples 1-4 and Comparative Examples 1-3

[0071] Serial number Compressive strength MPa <![CDATA[Coefficient of permeability (15 °C) cm / s, 10 -2 > Permeability loss rate % Example 1 41.6 4.5 16.9 Example 2 44.2 4.2 17.2 Example 3 40.4 3.9 15.1 Example 4 49.7 3.9 20.1 Comparative Example 1 48.9 3.6 21.1 Comparative Example 2 47.5 3.2 20.6 Comparative Example 3 36.9 4 12.3

[0072] Combining Examples 1-4 and the data in Table 2, it can be seen that the compressive strength of the biomass slag permeable bricks prepared in Examples 1-4 meets the requirements of permeable bricks, all greater than 40 MPa, and the permeability coefficient meets the requirements of permeable bricks, all greater than 2.0×10 -2 cm / s, and the water permeability coefficient loss rate is less than 25%, which meets the performance requirements of steel slag permeable bricks. Among them, the overall performance of the permeable bricks in Example 1 and Example 2 is better, and the water permeability coefficient is as high as 4.5×10 -2 cm / s, and the water permeability loss rate is as low as 16.9%. The compressive strength of the permeable bricks prepared in Example 4 is higher than that of the permeable bricks in Examples 1 and 2, but the water permeability and water permeability loss rate are not as good as those of the permeable bricks in Examples 1 and 2. It is speculated that this may be due to the fact that the amount of straw powder added in Example 4 is relatively small and the amount of cement added is relatively large. Therefore, it can be seen that the ratio of the components of the biomass steel slag permeable bricks has a greater influence on the compressive strength, water permeability and water permeability loss rate of the prepared biomass steel slag permeable bricks.

[0073] In combination with Example 1 and Comparative Examples 1-2, and in combination with the data in Table 2, it can be seen that the compressive strength of the permeable bricks prepared in Example 1 is not as good as the compressive strength of the permeable bricks prepared in Comparative Examples 1 and 2, but the compressive strength of the permeable bricks prepared in Example 1 meets the compressive strength requirements of the permeable bricks, and the permeability coefficient of the permeable bricks prepared in Example 1 is greater than the permeability coefficient of the permeable bricks prepared in Comparative Examples 1 and 2, and the permeability coefficient loss rate is less than the permeability coefficient loss rate of the permeable bricks prepared in Comparative Examples 1 and 2. The difference between Example 1 and Comparative Examples 1-2 is that straw powder is added to Example 1, and the ratio of the components in Example 1 is different from that in Comparative Examples 1 and 2. It is speculated that in Example 1, by adding straw powder and adjusting the ratio of the components of the permeable bricks, the added straw powder has a porous structure and water absorption performance, which is convenient for increasing the permeability coefficient of the permeable bricks. As time goes by, the straw powder degrades, delaying the process of internal pore clogging, thereby reducing the permeability coefficient loss rate of the permeable bricks.

[0074] Combining Example 1 and Comparative Example 3, and combining the data in Table 2, it can be seen that the permeability coefficient and permeability coefficient loss rate of the permeable brick of Comparative Example 3 are better than the permeability coefficient and permeability coefficient loss rate of the permeable brick of Example 1, but the compressive strength is worse than the compressive strength of the permeable brick of Example 1. After analysis, it can be found that the ratio of the components of the permeable brick of Comparative Example 3 is different from that of Example 1, and more straw powder is added to Comparative Example 3, so the compressive strength of the permeable brick obtained is poor. Therefore, it is necessary to adjust the ratio of the components of the permeable brick to obtain a permeable brick with better performance in all aspects.

[0075] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A biomass slag permeable brick, characterized in that: The invention comprises the following raw materials in parts by weight: 12-18 parts of cement, 70-78 parts of coarse aggregate, 5-10 parts of fine aggregate, 0.3-0.45 parts of straw powder and 4-6 parts of water.

2. The biomass slag permeable brick according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 13.7-15 parts of cement, 77.15-78 parts of coarse aggregate, 7.4-7.85 parts of fine aggregate, 0.4-0.45 parts of straw powder and 4-6 parts of water.

3. The biomass slag permeable brick according to claim 1, characterized in that: The straw powder is selected from one or more of corn stalks, wheat stalks and rice straw.

4. The biomass slag permeable brick according to claim 1, characterized in that: The particle size of the straw powder is 0.05-0.8 mm.

5. The biomass slag permeable brick according to claim 1, characterized in that: The cement is ordinary Portland cement.

6. The biomass slag permeable brick according to claim 1, characterized in that: It also includes one or more of the following features: S1) the coarse aggregate is steel slag aggregate; S2) The fine aggregate is stone powder.

7. The biomass slag permeable brick according to claim 6, characterized in that: The particle size of the steel slag aggregate is 5-12 mm.

8. A method for preparing a biomass slag permeable brick according to any one of claims 1 to 7, characterized in that: The steps include: (1) mixing cement, fine aggregate and straw powder to obtain a mixture; (2) mixing the mixture obtained in step (1) with coarse aggregate to obtain a mixture, and adding water to the mixture to obtain a mixed slurry; (3) injecting the mixed slurry obtained in step (2) into a mold, vibrating and pressing the mold, and curing the mold to obtain a biomass slag permeable brick.

9. The method for preparing biomass slag permeable brick according to claim 8, characterized in that: The compressive strength of the biomass slag permeable brick in step (3) is ≥40MPa, and the permeability coefficient is ≥2.0*10 -2 cm / s.

10. The method for preparing biomass slag permeable brick according to claim 8, characterized in that: The curing temperature in step (3) is 20-30° C., the curing time is 7-10 days, and the curing humidity is 60-70%.

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