Vegetation concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete preparation, and particularly discloses vegetation concrete and a preparation method thereof.The vegetation concrete is sequentially composed of a vegetation layer, a water retention layer and a water permeable layer from top to bottom; according to the plant-growing concrete disclosed by the invention, a seed premixing method and an intelligent layered pouring method are adopted, and the germination rate and the survival rate of plant seeds are remarkably improved through the water-retaining agent, the nutrient additive and a proper material ratio. The survival rate of the plants can reach 85% or above in severe environment areas such as side slopes, wastelands and mining areas, and is far higher than that of a traditional sowing mode. According to the method, not only is the greening speed increased, but also the greening coverage degree is effectively improved, a permeable layer and a water retention layer are integrated, the vegetation concrete has good water retention and water permeability by regulating and controlling the material ratio, water is stored in the concrete by introducing the water retention material such as polyacrylamide, and meanwhile, the greening coverage degree is effectively improved. The permeable structure on the bottom layer can effectively drain excessive water and prevent root rot.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete preparation, and in particular relates to a kind of planted concrete and a preparation method thereof. Background Art

[0002] In the existing vegetated concrete preparation technology, although attempts have been made to combine seeds with concrete materials to achieve ecological restoration and greening effects, there are still some significant shortcomings. Traditional preparation methods often lack efficient seed coating technology, resulting in uneven mixing of seeds and concrete materials, affecting the germination rate and survival rate of seeds. During the material mixing stage, existing technologies often find it difficult to accurately control the ratio and mixing time of various raw materials, resulting in poor consistency and fluidity of concrete, which in turn affects the overall performance of the vegetated concrete and the growth environment of the seeds.

[0003] Prior art CN114920525B discloses a high-strength vegetation concrete and a preparation method thereof, wherein the high-strength vegetation concrete comprises the following raw materials in parts by weight: cement: 90-120 parts; coarse aggregate: 300-350 parts; reinforcing filler: 50-100 parts; reinforcing agent: 30-60 parts; water reducer: 0.3-1 parts; water retainer: 10-15 parts; water: 30-50 parts; the reinforcing filler is obtained by granulating and calcining the following raw materials in parts by weight: metal oxide: 3-10 parts; pseudo-boehmite: 3-6 parts; fly ash: 20-40 parts; plant fiber powder: 0.5-1.5 parts; mica powder: 5-15 parts; low-melting-point glass powder: 5-10 parts; water: 3-8 parts. The high-strength vegetation concrete prepared by the invention can effectively improve the mechanical properties of concrete while ensuring its water permeability. The plant fiber powder is one or more of sawdust, bamboo powder, and straw powder. However, the operation method of the invention is too complicated, such as granulation, coating, firing and other steps. The mold frame, connecting rod, output shaft and other non-standard special equipment used are very small in the market, and the cost is high. It is still a long way from large-scale engineering application. Secondly, the plant fiber powder is burned to form holes during the calcination process, and loses its water absorption.

[0004] In view of this, the inventor proposes a biodegradable concrete and a preparation method thereof to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a bioremediation concrete and a preparation method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vegetation concrete comprises, from the top layer to the bottom layer, a vegetation layer, a water-retaining layer and a water-permeable layer.

[0008] Preferably, the vegetation layer is composed of 15% cement, 20% fine sand, 25% organic soil, 10% coconut bran, 2% water retaining agent, 1% slow-release fertilizer, 0.5% seeds and 26.5% water.

[0009] Preferably, the composition of the water-retaining layer is 20% cement, 35% medium-coarse sand, 15% coconut bran, 3% water-retaining agent and 27% water.

[0010] Preferably, the composition of the permeable layer is 25% cement, 40% coarse sand, 20% crushed stone and 15% water.

[0011] A method for preparing a biodegradable concrete comprises the following steps:

[0012] S1. Use coating equipment to mix seeds with coating agent, water retaining agent, nutrient additive and breathable material, and dry the coated seeds naturally at 15-20°C;

[0013] S2. Add coarse aggregate and fine aggregate into the mixer in proportion, stir at 120-150rpm for 1-2 minutes, add cement, water retaining agent and nutrient additive into the mixer in a predetermined proportion, mix evenly, add water at a water-cement ratio of 0.3-0.4, and add breathable materials for 3-5 minutes to ensure that the mixture reaches a suitable consistency and fluidity. In the final stage, add the pre-treated seeds evenly into the mixer and stir at a low speed for 1 minute to avoid damaging the seeds;

[0014] S3. Use a CNC layered pouring system to first pour the bottom layer of permeable concrete with a thickness of 50 to 70 mm, control the water-cement ratio of the permeable layer to 0.35 to 0.40, and lightly compact the surface after pouring to ensure good bonding between layers; pour the seed-containing vegetation concrete on top of the bottom layer with a thickness of 30 to 50 mm;

[0015] S4. Use spray equipment to spray an aqueous solution containing trace nutrients once a day. On the 3rd and 7th days of the initial curing period, spray an additional diluted fertilizer solution with a nitrogen, phosphorus and potassium ratio of 1:1:1. The curing period is 7 to 14 days, and use sensors to monitor the ambient temperature and humidity.

[0016] Preferably, the coating agent is at least one of saturated polyester resin, polyurethane resin, chitosan and fucoidan;

[0017] The water-retaining agent is at least one of polyacrylamide, highly absorbent resin, and starch graft copolymer;

[0018] The nutrient additive is at least one of a slow-release fertilizer, humic acid, organic fertilizer, and nitrogen, phosphorus and potassium compound fertilizer;

[0019] The air permeable material is at least one of perlite, vermiculite and ceramsite.

[0020] Preferably, in step S2, the stirring speed of the stirrer is maintained at 60-80 rpm, and the stirring is performed for 2-3 minutes so that the material is not separated into layers.

[0021] Preferably, the spraying conditions are: the spraying volume is 1L / m 2 , each spraying time is controlled within 3 to 5 minutes.

[0022] Preferably, the ambient temperature and humidity are: the temperature is maintained at 20-25° C., and the humidity is controlled between 60% and 70%.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention adopts the premixed seed method and the intelligent layered pouring method, and significantly improves the germination rate and survival rate of plant seeds through water retaining agent, nutrient additives and appropriate material ratio. In areas with harsh environments such as slopes, wastelands, and mining areas, the plant survival rate can reach more than 85%, which is much higher than the traditional sowing method. This method not only speeds up the greening speed, but also effectively improves the greening coverage.

[0025] (2) The present invention integrates a permeable layer and a water-retaining layer. By adjusting the material ratio, the vegetated concrete has good water retention and permeability. The introduction of water-retaining materials such as polyacrylamide allows water to be stored in the concrete, alleviating the adverse effects of drought on plant growth; at the same time, the permeable structure of the bottom layer can effectively drain excess water and prevent root rot. In addition, the plant roots in the vegetated concrete layer further stabilize the soil, helping to prevent soil erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flow chart of a method for preparing planted concrete. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1:

[0029] See also Figure 1As shown, this design is specifically applied to areas with fragile ecological environment, such as abandoned mines, saline-alkali land, desertified areas, slope protection, etc. Through the vegetated concrete technology, the soil erosion problem in these areas can be effectively alleviated, the rapid coverage and recovery of vegetation can be achieved, and the ecological self-repair ability of the area can be improved.

[0030] A kind of vegetation concrete, the vegetation concrete is composed of a vegetation layer, a water-retaining layer and a water-permeable layer from the top layer to the bottom layer.

[0031] The vegetation layer is composed of 15% cement, 20% fine sand, 25% peat, 10% coconut bran, 2% polyacrylamide, 1% slow-release fertilizer, 0.5% seeds and 26.5% water.

[0032] The water-retaining layer is composed of 20% cement, 35% medium-coarse sand, 15% coconut bran, 3% water-retaining agent and 27% water.

[0033] The composition of the permeable layer is 25% cement, 40% coarse sand, 20% crushed stone and 15% water.

[0034] A method for preparing a biodegradable concrete comprises the following steps:

[0035] S1. Use coating equipment to mix the seeds with coating agent, water retaining agent, nutrient additives and breathable materials. The coated seeds are naturally dried at 15°C to ensure that the seeds are not damaged;

[0036] S2, add coarse aggregate and fine aggregate into the mixer in proportion, stir at 150rpm for 2 minutes to ensure that the aggregate is evenly distributed, add cement, water retaining agent and nutrient additive into the mixer in a predetermined proportion, mix evenly, add water at a water-cement ratio of 0.4, and add coconut bran as a breathable material at the same time, stir for 5 minutes to ensure that the mixture reaches a suitable consistency and fluidity, and in the final stage, evenly add the pre-treated seeds into the mixer and stir at a low speed for 1 minute to avoid damaging the seeds;

[0037] S3. Use the CNC layered pouring system to first pour the bottom layer of permeable concrete with a thickness of 70 mm, and control the water-cement ratio of the permeable layer to 0.35 to improve drainage. After pouring, lightly compact the surface to ensure good bonding between layers. Pour the seed-containing vegetation concrete on top of the bottom layer with a thickness of 50 mm.

[0038] S4. Use spray equipment to spray an aqueous solution containing trace nutrients once a day to ensure that the seeds are in a suitable humidity and nutrient environment; on the 3rd and 7th days of the initial curing period, spray an additional diluted fertilizer solution with a nitrogen, phosphorus and potassium ratio of 1:1:1 and a concentration of 0.1%. The curing period is 14 days, and then gradually reduce the spraying frequency to enhance the initial nutrient supply of the seeds, and use sensors to monitor the ambient temperature and humidity.

[0039] Specifically, the coating agent is polyurethane resin

[0040] The water retaining agent is polyacrylamide;

[0041] The nutrient additive is a mixture of slow-release fertilizer and nitrogen, phosphorus and potassium compound fertilizer in a ratio of 2:1;

[0042] The air permeable material is perlite.

[0043] Specifically, in step S2, the stirring speed of the stirrer is 60 rpm, and the stirring is performed for 3 minutes until the material is not separated into layers.

[0044] Specifically, the spraying conditions are: spraying volume is 1L / m 2 , spray for 5 minutes each time to ensure even coverage.

[0045] Specifically, the ambient temperature and humidity are: temperature is 20° C., and humidity is 60%.

[0046] As can be seen from the above, the vegetation concrete adopts the pre-mixed seed method and the intelligent layered pouring method, and significantly improves the germination rate and survival rate of plant seeds through water retaining agent, nutrient additives and appropriate material ratio. In areas with harsh environments such as slopes, wastelands, and mining areas, the plant survival rate can reach more than 85%, which is much higher than the traditional sowing method. This method not only speeds up the greening speed, but also effectively improves the greening coverage.

[0047] The permeable layer and the water-retaining layer are integrated, and the material ratio is adjusted to make the vegetated concrete have good water retention and permeability. The introduction of water-retaining materials such as polyacrylamide allows water to be stored in the concrete, alleviating the adverse effects of drought on plant growth; at the same time, the permeable structure of the bottom layer can effectively drain excess water and prevent root rot. In addition, the plant roots in the vegetated concrete layer further stabilize the soil, helping to prevent soil erosion.

[0048] Embodiment 2:

[0049] Vegetation layer: cement 18%, fine sand 22%, organic soil 20%, coconut bran 12%, water retaining agent (polyacrylamide) 3%, slow-release fertilizer 1.5%, seeds 0.6%, water 23.9%.

[0050] Water-retaining layer: cement 22%, medium-coarse sand 30%, coconut bran 18%, water-retaining agent (super absorbent resin SAP) 4%, water 26%.

[0051] Permeable layer: 28% cement, 35% coarse sand, 25% gravel, 12% water.

[0052] The difference between the preparation method of this embodiment and that of the first embodiment is that the stirring speed is increased to 80 rpm and the stirring time is extended to 4 minutes.

[0053] The maintenance period is extended to 21 days, and the frequency of fertilizer spraying is increased to once every 5 days.

[0054] Embodiment three:

[0055] Vegetation layer: cement 12%, fine sand 25%, organic soil 30%, coconut bran 8%, water retaining agent (starch graft copolymer) 2.5%, slow-release fertilizer 0.8%, seeds 0.4%, water 21.3%.

[0056] Water-retaining layer: cement 18%, medium-coarse sand 40%, coconut bran 12%, water-retaining agent (polyacrylamide) 2.5%, water 27.5%.

[0057] Permeable layer: 22% cement, 45% coarse sand, 25% gravel, 8% water.

[0058] Preparation Adjustments:

[0059] Use expanded clay instead of coconut bran as breathable material.

[0060] The curing temperature was increased to 25°C and the humidity was reduced to 55%.

[0061] Comparative Example 1:

[0062] Cement 30%, sand 40%, gravel 25%, water 5%.

[0063] Preparation method:

[0064] No water retaining agent, nutrient additives or seed mix, single layer pouring, conventional maintenance.

[0065] Comparative Example 2:

[0066] (Low water retention agent ratio)

[0067] formula:

[0068] Vegetation layer: 15% cement, 20% fine sand, 25% organic soil, 10% coconut bran, 0.5% water retaining agent (polyacrylamide), 0.5% slow-release fertilizer, 0.5% seeds, and 28.5% water.

[0069] Preparation method: The amount of water retaining agent is reduced by 80%, and the other steps are the same as those in Example 1.

[0070] The following are the test result data of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2 after 28 days. The test is based on: GB / T50081-2019 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete". The test results are shown in Table 1 below:

[0071] Experimental Group Compressive strength(MPa) Flexural strength(MPa) Shear strength(MPa) Embodiment 1 24.2 4.1 3.2 Embodiment 2 24.6 3.9 3.1 Embodiment 3 22.3 4.0 3.1 Comparative Example 1 22.1 3.2 2.9 Comparative Example 2 17.6 2.9 2.7

[0072] Table 1

[0073] Data analysis

[0074] Example 2: By increasing the cement ratio and the water retaining agent content, the compressive strength is increased to 24.6 MPa, but the increase in flexural and shear strengths is limited, which is related to the optimization of aggregate ratio.

[0075] Example 3: Reducing the amount of cement and using ceramsite instead of coconut bran results in a decrease in compressive strength to 22.3 MPa, but better water permeability.

[0076] Comparative experiment 1: Traditional concrete has the highest compressive strength (25.4MPa) because it has no water retention layer and vegetation layer, but it is completely unsuitable for ecological greening scenarios.

[0077] Comparative experiment 2: Insufficient water retaining agent caused the compressive strength to drop sharply to 17.6MPa, and the plant survival rate was low, which verified the dual importance of water retaining agent to strength and ecological performance;

[0078] In addition, the effect evaluation of Example 1:

[0079] 1. Experimental environment conditions

[0080] Climate: Temperate zone, average temperature during construction is 22°C, humidity is 65%.

[0081] Slope conditions: 30° slope, poor surface soil and poor drainage.

[0082] 2. Vegetation effect

[0083] Seed germination rate: After 14 days of secondary maintenance, the seed germination rate reached 92%, mainly due to the effective effects of water retaining agent and humic acid.

[0084] Plant survival rate: During the subsequent 30-day observation period, the plant survival rate remained at around 85%, much higher than the 60% survival rate of traditional methods.

[0085] Plant growth: The average plant height reached 15cm, the growth was even, and the root system penetrated deep into the bottom layer, stabilizing the slope soil.

[0086] Water permeability: The bottom layer water permeability is 8L / min / m 2 , which is suitable for the drainage needs of the slope and avoids soil loss caused by water accumulation.

[0087] 3. Material stability and durability

[0088] Durability: The compressive strength of the vegetated concrete is 18MPa, which meets the long-term stability requirements of slope greening, and the plant growth has no destructive effect on the concrete structure.

[0089] Water retention: With coconut bran and polyacrylamide, the water retention rate of the soil is increased by 35%, providing moisture support for the continued growth of plants.

[0090] 4. Ecological effects

[0091] Environmental adaptability: Plants can still grow well under conditions of high temperature or less rainfall, and the vegetation coverage has reached more than 80%.

[0092] Ecological restoration: Three months after the construction, the greening effect was obvious, and the slope ecosystem was initially formed, providing a living environment for birds and insects.

[0093] From the above, we can see that the vegetation concrete prepared by the premixed seed method and intelligent layered pouring method greatly improves the germination rate and survival rate of plants, and is suitable for scenes such as slope greening and wasteland restoration. The overall effect has obvious advantages over traditional construction methods, and the material cost is low, which has the value of promotion and application;

[0094] Ecological restoration and environmental recovery: This technology not only provides a basic environment for plant growth, but also gradually forms a micro-ecosystem. After several months of natural growth, the plants on the vegetated concrete begin to attract insects and birds, gradually restoring the regional ecological diversity. Compared with traditional greening materials, this greening method based on vegetated concrete can improve the ecological environment in the long term and promote soil recovery.

[0095] Durability and economy: The green concrete has a reasonable formula design and a compressive strength of 24.3MPa, which can withstand long-term natural environmental erosion and reduce the cost of later maintenance. Its stability and durability in harsh environments such as slopes and wastelands reduce the cost of long-term repair and renovation, making it highly economical.

[0096] Automation and intelligent application: This technology integrates the intelligent layered pouring system, which can accurately control the thickness and material distribution of each layer of concrete, reduce manual errors, and improve construction efficiency. In a wide range of applications, this automated and intelligent construction method not only improves construction quality, but also saves labor costs.

[0097] Test method and steps of embodiment 1

[0098] 1. Seed germination rate test

[0099] Objective: To evaluate seed germination in vegetated concrete.

[0100] step:

[0101] Sample collection: Select an area of ​​50 cm × 50 cm in the prepared vegetation concrete and mark the test sample area.

[0102] Monitoring: Observe the germination of seeds every day and record the number of seeds that germinate.

[0103] Calculation: After 14 days, the total number of germinations was counted and the germination rate was calculated (germination rate = number of germinated seeds / total number of seeds × 100%).

[0104] The specific effect analysis is as follows:

[0105] Actual effect: The test results show that the germination rate is 92%, indicating that the design of the concrete structure and water-retaining agent effectively ensures the germination environment of the seeds.

[0106] 2. Survival rate test

[0107] Objective: To evaluate the survival of seeds after germination in planted concrete.

[0108] step:

[0109] Sample collection: Select the same 50cm×50cm area as the test area.

[0110] Monitoring period: Continue to observe for 30 days after germination and record the number of surviving plants.

[0111] Calculation: Calculate the survival rate (survival rate = number of surviving plants / number of germinated plants x 100%).

[0112] Effect analysis:

[0113] Actual effect: The survival rate was 87%, indicating that the water retaining agent and nutrient additives supported the initial growth of the plants and provided a guarantee for the greening effect.

[0114] 3. Water retention test

[0115] Purpose: To test the water retention capacity of vegetated concrete to ensure that it can still provide water to plants in arid environments.

[0116] step:

[0117] Sample preparation: Take a 50 cm × 50 cm × 5 cm concrete block and place it in dry conditions indoors for 48 hours, and record the initial weight (W1).

[0118] Water absorption test: Soak the sample in water for 24 hours, take it out and weigh it (W2).

[0119] Calculation of water retention: Calculate the water absorption rate (water absorption rate = (W2-W1) / W1×100%).

[0120] Effect analysis:

[0121] Actual effect: The water absorption rate is 35%, which shows that water-retaining materials such as coconut bran and polyacrylamide effectively improve the water retention performance and are beneficial to the continuous growth of plants.

[0122] 4. Water permeability test

[0123] Purpose: To test the water permeability of vegetated concrete, ensure that excess water is quickly discharged, and prevent root rot.

[0124] step:

[0125] Sample preparation: Place a 50cm×50cm×5cm concrete block on a funnel device and place it under a water source with a fixed flow rate.

[0126] Test: Pour water onto the sample continuously and record the amount of water that passes through the sample within 1 minute (in L / m 2 ·min).

[0127] Water permeability calculation: Calculate the water permeability and compare it with the standard value.

[0128] Effect analysis:

[0129] Actual effect: The water permeability test result is 8.5L / m 2 ·min, which is in line with expectations, indicating that the bottom permeable concrete layer can effectively drain water and help keep the roots dry.

[0130] 5. Compressive strength test

[0131] Purpose: To ensure the structural strength of the green concrete to meet the slope stability requirements.

[0132] step:

[0133] Sample preparation: A 100 mm × 100 mm × 100 mm cube of vegetated concrete was placed on a compression testing machine.

[0134] Loading: Apply pressure gradually at a standard speed and record the maximum pressure value when the sample breaks.

[0135] Calculation: Calculate the compressive strength according to the formula (compressive strength = maximum load / cross-sectional area).

[0136] Effect analysis:

[0137] Actual effect: The test result is 18.3MPa, which meets the slope stability requirements, indicating that the material has sufficient strength and is suitable for use in slopes or other similar scenarios.

[0138] 6. Ecological effect test

[0139] Purpose: To verify the ecological effects of vegetated concrete in actual environments, including vegetation coverage and species diversity.

[0140] step:

[0141] Plant growth monitoring: After construction is completed, record the growth of plants (height, density, coverage area) regularly (every 7 days).

[0142] Coverage calculation: The vegetation coverage was calculated after 90 days (coverage = green area / total area × 100%).

[0143] Biodiversity observation: record the ecological changes of insects, birds, etc. in the vegetation area, and evaluate the effect of ecological restoration.

[0144] Effect analysis:

[0145] Actual effect: After 90 days, the vegetation coverage rate reached 83%, and an increase in insect species was observed. Some birds also appeared in the green area, indicating that the vegetated concrete has a good ecological restoration effect.

[0146] As can be seen from the above, the germination rate, survival rate and water retention tests all achieved the design goals, verifying the rationality of the materials. The water permeability and compressive strength tests met the physical performance requirements of slope greening and ensured the safety and stability of the structure. The ecological effect showed that the vegetation concrete not only provided a suitable environment for plant growth, but also promoted the recovery of the local ecological environment, achieving the dual goals of greening and ecological balance. The above test results show that the vegetation concrete has significant plant survival rate, water retention and air permeability, and ecological restoration effects in slope greening applications, and is suitable for promotion and application in a variety of environments.

[0150] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A planted concrete, characterized in that: The vegetation concrete is composed of a vegetation layer, a water-retaining layer and a water-permeable layer from the top layer to the bottom layer.

2. The planted concrete according to claim 1, characterized in that: The vegetation layer is composed of 15% cement, 20% fine sand, 25% organic soil, 10% coconut bran, 2% water retaining agent, 1% slow-release fertilizer, 0.5% seeds and 26.5% water.

3. The planted concrete according to claim 1, characterized in that: The water-retaining layer is composed of 20% cement, 35% medium-coarse sand, 15% coconut bran, 3% water-retaining agent and 27% water.

4. The planted concrete according to claim 1, characterized in that: The composition of the permeable layer is 25% cement, 40% coarse sand, 20% crushed stone and 15% water.

5. The method for preparing a planted concrete according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Use coating equipment to mix seeds with coating agent, water retaining agent, nutrient additive and breathable material, and dry the coated seeds naturally at 15-20°C; S2. Add coarse aggregate and fine aggregate into a mixer in proportion, stir at 120-150 rpm for 1-2 minutes, add cement, water retaining agent and nutrient additive into the mixer in a predetermined proportion, mix evenly, add water at a water-cement ratio of 0.3-0.4, and add breathable material for 3-5 minutes to ensure that the mixture reaches a suitable consistency and fluidity, finally, evenly add the pretreated seeds into the mixer and continue stirring; S3. Use a CNC layered pouring system to first pour the bottom layer of permeable concrete with a thickness of 50 to 70 mm, control the water-cement ratio of the permeable layer to 0.35 to 0.40, and lightly compact the surface after pouring to ensure good bonding between layers; pour the seed-containing vegetation concrete on top of the bottom layer with a thickness of 30 to 50 mm; S4. Use spray equipment to spray an aqueous solution containing trace nutrients once a day. On the 3rd and 7th days of the initial curing period, spray an additional diluted fertilizer solution with a nitrogen, phosphorus and potassium ratio of 1:1:

1. The curing period is 7 to 14 days, and use sensors to monitor the ambient temperature and humidity.

6. The method for preparing a planted concrete according to claim 5, characterized in that: The coating agent is at least one of saturated polyester resin, polyurethane resin, chitosan and fucoidan; The water-retaining agent is at least one of polyacrylamide, highly absorbent resin, and starch graft copolymer; The nutrient additive is at least one of a slow-release fertilizer, humic acid, organic fertilizer, and nitrogen, phosphorus and potassium compound fertilizer; The air permeable material is at least one of perlite, vermiculite and ceramsite.

7. The method for preparing a planted concrete according to claim 5, characterized in that: In step S2, the stirring speed of the stirrer is maintained at 60-80 rpm for 2-3 minutes until the material is not separated into layers.

8. The method for preparing a planted concrete according to claim 5, characterized in that: Spraying conditions: spraying volume 1L / m 2 , each spraying time is controlled within 3 to 5 minutes.

9. The method for preparing a planted concrete according to claim 5, characterized in that: Ambient temperature and humidity: the temperature is maintained at 20-25°C, and the humidity is controlled between 60% and 70%.

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