Low-alkali vegetation concrete for ecological slope protection and preparation method thereof

Abstract

This invention belongs to the field of building materials technology, specifically disclosing a low-alkali vegetated concrete for ecological slope protection and its preparation method. The concrete comprises 80-100 parts of sulfoaluminate cement, 25-35 parts of slag powder, 20-25 parts of fly ash, 5-9 parts of bio-activator, 150-180 parts of pumice, 400-450 parts of manufactured sand, 80-100 parts of ceramsite, 50-60 parts of straw fiber, 2-5 parts of functional additives, and 8-10 parts of amino-modified graphene oxide-carboxymethyl cellulose. This invention utilizes the above-mentioned low-alkali vegetated concrete for ecological slope protection and its preparation method. The concrete is low in alkalinity and has high porosity, possessing both mechanical strength, ecological compatibility, and construction adaptability.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a low-alkali vegetation concrete for ecological slope protection and its preparation method. Background Technology

[0002] With the continuous advancement of industrialization and urbanization, infrastructure projects involve extensive excavation, resulting in numerous exposed soil and rock slopes. This damages native ecosystems, causes soil erosion and environmental pollution, and seriously threatens the surrounding environment and project safety. To date, traditional slope protection methods have revealed many problems: they damage the original ecological environment and affect biodiversity; they are susceptible to erosion and damage, increasing maintenance costs; and they lack aesthetic appeal, failing to meet the demands of modern urban landscapes. Furthermore, with the development of artificial island and reef engineering, the demand for effectively corrosion-resistant, non-leaching, and pollution-free ecological porous concrete materials is increasing significantly in the market. These materials require adequate strength and vegetation-friendly properties. Driven by growing concern for environmental sustainability, people are exploring methods to maintain slope stability and the ecological environment, and the application of ecological porous concrete is an effective way to achieve the organic integration of concrete structures and vegetation.

[0003] Most existing vegetation-friendly concrete uses silicate cement as the cementitious material. Silicate cement produces a large amount of hydration product Ca(OH)2 upon hydration, resulting in high alkalinity within the pores of the prepared vegetation-friendly concrete, which cannot meet the requirements for plant root growth. Existing products often struggle to achieve a balance between plant growth and concrete performance, limiting their widespread application. Therefore, developing a concrete material with excellent ecological properties is of great significance for achieving sustainable development in the building materials industry. Summary of the Invention

[0004] The purpose of this invention is to provide a low-alkali vegetation concrete for ecological slope protection and its preparation method. The concrete is low in alkalinity and has high porosity, and combines mechanical strength, ecological compatibility and construction adaptability.

[0005] To achieve the above objectives, this invention provides a low-alkali vegetation concrete for ecological slope protection, comprising 80-100 parts of sulfoaluminate cement, 25-35 parts of slag powder, 20-25 parts of fly ash, 5-9 parts of bio-activator, 150-180 parts of pumice, 400-450 parts of manufactured sand, 80-100 parts of ceramsite, 50-60 parts of straw fiber, 2-5 parts of functional additives, and 8-10 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0006] Preferably, the bioactivator comprises wood-decaying fungal mycelium powder and organocalcium phosphate, wherein the mass ratio of wood-decaying fungal mycelium powder to organocalcium phosphate is 1.5-3.

[0007] Preferably, the pumice has a particle size of 10-20 mm and the manufactured sand has a particle size of 20-30 mesh.

[0008] Preferably, the ceramsite has a particle size of 30-50 mm and the straw fiber length is 10-20 mm.

[0009] Preferably, the functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0010] This invention also provides a method for preparing low-alkali vegetated concrete for ecological slope protection, comprising the following steps:

[0011] Step 1, aggregate pretreatment: Soak pumice and ceramsite in oxalic acid solution for 8 hours and dry them; spray straw fiber with ferrous sulfate solution and let it stand for 24 hours.

[0012] Step 2, Gradient Mixing and Pouring:

[0013] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0014] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0015] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is sprayed under high pressure to cover the bottom layer of mixture.

[0016] Step 3: Maintenance and Treatment

[0017] After demolding, a sealed curing chamber is filled with industrial waste gas containing CO2 for 48 hours. Then, an active coating containing Bacillus subtilis is sprayed onto the concrete surface to form a mineralized layer. The concrete is then covered with non-woven fabric and sprayed for curing for 14 days.

[0018] Preferably, in step one, the oxalic acid solution has a mass concentration of 5%, and the ferrous sulfate solution has a mass concentration of 1%.

[0019] Preferably, in step two, the thickness of the surface mixture sprayed under high pressure is 15-20 mm.

[0020] Preferably, in step three, the CO2 concentration is ≥20%, and the thickness of the Bacillus subtilis active coating is 0.8-1.2 mm.

[0021] The advantages and beneficial effects of the low-alkali vegetation concrete for ecological slope protection and its preparation method described above are as follows:

[0022] 1. This invention reduces the alkalinity of cement by adding slag powder and fly ash to replace a portion of the cement.

[0023] 2. This invention creates interconnected pores by adding pumice, expanded clay, straw fiber, and bio-activators to concrete, which helps plant roots attach.

[0024] 3. This invention improves the performance of concrete by adding functional additives, reduces the surface alkalinity of pumice and ceramsite by soaking them in oxalic acid solution, thus reducing the alkalinity of the concrete, lowers the pH of the mortar solution by using sodium bicarbonate, and improves the frost-crack resistance of concrete by using sodium dodecylbenzene sulfonate and rosin thermal polymer.

[0025] 4. This invention improves the compressive strength of concrete by introducing CO2 gas for mineralization curing, and improves the surface erosion resistance and promotes plant root attachment by spraying a Bacillus subtilis active coating on the concrete surface.

[0026] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0027] The technical solution of the present invention will be further described below through embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0029] Unless otherwise defined, all reagents, equipment and other materials used in this invention are commercially available.

[0030] Example 1

[0031] A low-alkali vegetation concrete for ecological slope protection comprises 80 parts of sulfoaluminate cement, 25 parts of slag powder, 25 parts of fly ash, 6 parts of bio-activator, 160 parts of pumice, 400 parts of manufactured sand, 85 parts of ceramsite, 55 parts of straw fiber, 4 parts of functional additives, and 8 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0032] The bioactivator consists of wood-decaying fungal mycelium powder and organophosphate, with a mass ratio of wood-decaying fungal mycelium powder to organophosphate of 2.

[0033] The pumice has a particle size of 10mm, and the manufactured sand has a particle size of 20 mesh.

[0034] The ceramsite particle size is 30mm, and the straw fiber length is 20mm.

[0035] Functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0036] A method for preparing low-alkali vegetation concrete for ecological slope protection includes the following steps:

[0037] Step 1, aggregate pretreatment: Soak pumice and ceramsite in a 5% oxalic acid solution for 8 hours and then dry them; spray straw fiber with a 1% ferrous sulfate solution and let it stand for 24 hours.

[0038] Step 2, Gradient Mixing and Pouring:

[0039] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0040] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0041] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is then sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 15mm.

[0042] Step 3: Maintenance and Treatment

[0043] After demolding, a sealed curing chamber is purged with industrial waste gas containing ≥20% CO2 for 48 hours. Then, an active coating containing Bacillus subtilis with a thickness of 1.0 mm is sprayed onto the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

[0044] Example 2

[0045] A low-alkali vegetation concrete for ecological slope protection comprises 90 parts of sulfoaluminate cement, 30 parts of slag powder, 20 parts of fly ash, 9 parts of bio-activator, 150 parts of pumice, 420 parts of manufactured sand, 95 parts of ceramsite, 60 parts of straw fiber, 5 parts of functional additives, and 10 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0046] The bioactivator consists of wood-decaying fungal mycelium powder and organophosphate, with a mass ratio of wood-decaying fungal mycelium powder to organophosphate of 2.5.

[0047] The pumice has a particle size of 20mm, and the manufactured sand has a particle size of 10 mesh.

[0048] The ceramsite has a particle size of 40mm and the straw fiber length is 15mm.

[0049] Functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0050] A method for preparing low-alkali vegetation concrete for ecological slope protection includes the following steps:

[0051] Step 1, aggregate pretreatment: Soak pumice and ceramsite in a 5% oxalic acid solution for 8 hours and then dry them; spray straw fiber with a 1% ferrous sulfate solution and let it stand for 24 hours.

[0052] Step 2, Gradient Mixing and Pouring:

[0053] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0054] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0055] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 18mm.

[0056] Step 3: Maintenance and Treatment

[0057] After demolding, a sealed curing chamber is purged with industrial waste gas containing ≥20% CO2 for 48 hours. Then, an active coating containing Bacillus subtilis with a thickness of 0.8mm is sprayed onto the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

[0058] Example 3

[0059] A low-alkali vegetation concrete for ecological slope protection comprises 100 parts of sulfoaluminate cement, 35 parts of slag powder, 20 parts of fly ash, 5 parts of bio-activator, 180 parts of pumice, 450 parts of manufactured sand, 100 parts of ceramsite, 60 parts of straw fiber, 2 parts of functional additives, and 9 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0060] The bioactivator includes wood-decaying fungus mycelium powder and organophosphate calcium, with a mass ratio of wood-decaying fungus mycelium powder to organophosphate calcium of 1.5.

[0061] The pumice has a particle size of 15mm, and the manufactured sand has a particle size of 25 mesh.

[0062] The ceramsite has a particle size of 40mm and the straw fiber length is 15mm.

[0063] Functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0064] A method for preparing low-alkali vegetation concrete for ecological slope protection includes the following steps:

[0065] Step 1, aggregate pretreatment: Soak pumice and ceramsite in a 5% oxalic acid solution for 8 hours and then dry them; spray straw fiber with a 1% ferrous sulfate solution and let it stand for 24 hours.

[0066] Step 2, Gradient Mixing and Pouring:

[0067] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0068] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0069] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 18mm.

[0070] Step 3: Maintenance and Treatment

[0071] After demolding, a sealed curing chamber is purged with industrial waste gas containing ≥20% CO2 for 48 hours. Then, an active coating containing Bacillus subtilis with a thickness of 1.2mm is sprayed onto the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

[0072] Comparative Example 1

[0073] An ecological slope protection concrete comprises 80 parts of sulfoaluminate cement, 25 parts of slag powder, 25 parts of fly ash, 160 parts of pumice, 400 parts of manufactured sand, 85 parts of ceramsite, 4 parts of functional additives, and 8 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0074] The pumice has a particle size of 10mm, and the manufactured sand has a particle size of 20 mesh.

[0075] The particle size of the expanded clay aggregate is 30mm.

[0076] Functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0077] A method for preparing ecological slope protection concrete includes the following steps:

[0078] Step 1, aggregate pretreatment: Soak pumice and ceramsite in a 5% oxalic acid solution for 8 hours, then dry them;

[0079] Step 2, Gradient Mixing and Pouring:

[0080] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0081] Bottom layer mixture: Add water to the ceramsite and stir until the slump is ≥250mm;

[0082] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is then sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 15mm.

[0083] Step 3: Maintenance and Treatment

[0084] After demolding, a sealed curing chamber is purged with industrial waste gas containing ≥20% CO2 for 48 hours. Then, an active coating containing Bacillus subtilis with a thickness of 1.0 mm is sprayed onto the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

[0085] Comparative Example 2

[0086] An ecological slope protection concrete comprises 80 parts of sulfoaluminate cement, 25 parts of slag powder, 25 parts of fly ash, 6 parts of bio-activator, 160 parts of pumice, 400 parts of manufactured sand, 85 parts of ceramsite, and 55 parts of straw fiber.

[0087] The bioactivator consists of wood-decaying fungal mycelium powder and organophosphate, with a mass ratio of wood-decaying fungal mycelium powder to organophosphate of 2.

[0088] The pumice has a particle size of 10mm, and the manufactured sand has a particle size of 20 mesh.

[0089] The ceramsite particle size is 30mm, and the straw fiber length is 20mm.

[0090] A method for preparing ecological slope protection concrete includes the following steps:

[0091] Step 1, aggregate pretreatment: Spray straw fiber with a 1% ferrous sulfate solution and let it stand for 24 hours;

[0092] Step 2, Gradient Mixing and Pouring:

[0093] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand and pumice for 3 minutes, add water and stir until the fluidity is ≥180mm;

[0094] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0095] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is then sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 15mm.

[0096] Step 3: Maintenance and Treatment

[0097] After demolding, a sealed curing chamber is purged with industrial waste gas containing ≥20% CO2 for 48 hours. Then, an active coating containing Bacillus subtilis with a thickness of 1.0 mm is sprayed onto the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

[0098] Comparative Example 3

[0099] An ecological slope protection concrete comprises 80 parts of sulfoaluminate cement, 25 parts of slag powder, 25 parts of fly ash, 6 parts of bio-activator, 160 parts of pumice, 400 parts of manufactured sand, 85 parts of ceramsite, 55 parts of straw fiber, 4 parts of functional additives, and 8 parts of amino-modified graphene oxide-carboxymethyl cellulose.

[0100] The bioactivator consists of wood-decaying fungal mycelium powder and organophosphate, with a mass ratio of wood-decaying fungal mycelium powder to organophosphate of 2.

[0101] The pumice has a particle size of 10mm, and the manufactured sand has a particle size of 20 mesh.

[0102] The ceramsite particle size is 30mm, and the straw fiber length is 20mm.

[0103] Functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer.

[0104] A method for preparing ecological slope protection concrete includes the following steps:

[0105] Step 1, aggregate pretreatment: Soak pumice and ceramsite in a 5% oxalic acid solution for 8 hours and then dry them; spray straw fiber with a 1% ferrous sulfate solution and let it stand for 24 hours.

[0106] Step 2, Gradient Mixing and Pouring:

[0107] Surface mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm.

[0108] Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm;

[0109] Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is then sprayed with high pressure to cover the bottom layer of mixture. The thickness of the surface mixture sprayed with high pressure is 15mm.

[0110] Step 3: Curing treatment: Cover with non-woven fabric and spray with water for 14 days.

[0111] The concrete prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in Table 1.

[0112] Table 1 Test Results

[0113]

[0114]

[0115] As shown in Table 1, the pH of Examples 1-3 can reach below 8.5, the porosity reaches 35%, the mass loss after 300 freeze-thaw cycles is less than 5%, and the compressive strength can reach 35 MPa. Comparative Example 1 did not add any bioactivator or straw fiber. The straw fiber and expanded clay aggregate form interconnected pores, increasing the porosity. The bioactivator promotes plant root development and improves plant survival rate. Comparative Example 2 did not add any functional additives or amino-modified graphene oxide-carboxymethyl cellulose. The graphene oxide in amino-modified graphene oxide-carboxymethyl cellulose has extremely high Young's modulus and tensile strength, which can effectively improve the compressive, flexural, and tensile strength of concrete, reduce crack propagation, and thus improve overall durability. Sodium bicarbonate in the functional additives adjusts the pH of cement mortar, reducing the alkalinity of concrete. Oxalic acid solution soaks expanded clay and pumice, further reducing their alkalinity and thus the concrete's alkalinity. Sodium dodecylbenzene sulfonate and rosin thermal polymers introduce uniformly distributed microbubbles to buffer the expansion stress generated by water freezing during freeze-thaw cycles, reducing the risk of internal damage and improving the concrete's resistance to freeze-thaw cracking. Comparative Example 3 did not undergo CO2 mineralization or the application of a Bacillus subtilis active coating to the concrete. CO2 converts calcium hydroxide in the cementitious materials into calcium carbonate, increasing compressive strength. The applied active coating induces calcium carbonate precipitation through microorganisms, forming a mineralized layer that improves erosion resistance and lowers the surface pH, promoting plant rooting.

[0116] Therefore, the present invention adopts the above-mentioned low-alkali vegetation concrete for ecological slope protection and its preparation method. The concrete has low alkalinity and high porosity, and has mechanical strength, ecological compatibility and construction adaptability.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A low-alkali vegetation concrete for ecological slope protection, characterized in that: It includes 80-100 parts of sulfoaluminate cement, 25-35 parts of slag powder, 20-25 parts of fly ash, 5-9 parts of bio-activator, 150-180 parts of pumice, 400-450 parts of manufactured sand, 80-100 parts of ceramsite, 50-60 parts of straw fiber, 2-5 parts of functional additives, and 8-10 parts of amino-modified graphene oxide-carboxymethyl cellulose. The bioactivator comprises wood-decaying fungus mycelium powder and organic calcium phosphate, with a mass ratio of wood-decaying fungus mycelium powder to organic calcium phosphate of 1.5-3. The functional additives include sodium bicarbonate, oxalic acid solution, sodium dodecylbenzene sulfonate, and rosin thermal polymer; The preparation method of low-alkali vegetation concrete for ecological slope protection includes the following steps: Step 1, aggregate pretreatment: Soak pumice and ceramsite in oxalic acid solution for 8 hours and dry them; spray straw fiber with ferrous sulfate solution and let it stand for 24 hours. Step 2, Gradient Mixing and Casting: Surface Mixture: Mix sulfoaluminate cement, slag powder, fly ash, manufactured sand, pumice, sodium bicarbonate, amino-modified graphene oxide-carboxymethyl cellulose, sodium dodecylbenzene sulfonate, and rosin thermal polymer for 3 minutes, then add water and stir until the fluidity is ≥180mm. Bottom mixture: Mix ceramsite, straw fiber, and bio-activator for 2 minutes, add water and stir until the slump is ≥250mm; Layered casting: High-precision molds are used for molding. First, the bottom layer of mixture is poured into the mold and vibrated to compact it. After standing for 15 minutes, the top layer of mixture is sprayed under high pressure to cover the bottom layer of mixture. Step 3: Curing treatment: After demolding, the curing chamber is sealed and industrial waste gas containing CO2 is introduced for 48 hours. Then, an active coating containing Bacillus subtilis is sprayed on the concrete surface to form a mineralized layer. The surface is then covered with non-woven fabric and sprayed for curing for 14 days.

2. The low-alkali vegetation concrete for ecological slope protection according to claim 1, characterized in that: The pumice has a particle size of 10-20 mm, and the manufactured sand has a particle size of 20-30 mesh.

3. The low-alkali vegetation concrete for ecological slope protection according to claim 1, characterized in that: The ceramsite has a particle size of 30-50mm and the straw fiber length is 10-20mm.

4. The low-alkali vegetation concrete for ecological slope protection according to claim 1, characterized in that: In step one, the oxalic acid solution has a mass concentration of 5%, and the ferrous sulfate solution has a mass concentration of 1%.

5. The low-alkali vegetation concrete for ecological slope protection according to claim 1, characterized in that: In step two, the thickness of the surface mixture sprayed under high pressure is 15-20 mm.

6. The low-alkali vegetation concrete for ecological slope protection according to claim 1, characterized in that: In step three, the CO2 concentration is ≥20%, and the thickness of the Bacillus subtilis active coating is 0.8-1.2 mm.

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