Ecological green rust brick of concrete and microorganism / lichen symbiosis and manufacturing method

Abstract

This invention relates to the field of ecological brick technology, specifically to an ecological green rust brick based on the symbiosis of concrete and microorganisms / lichens, and its manufacturing method. The specific technical solution is as follows: An ecological green rust brick based on the symbiosis of concrete and microorganisms / lichens, comprising, by weight percentage, 35%-45% base material, 25%-35% lightweight aggregate, 10%-20% mineral admixture, 10%-15% bioactive additive, and 3%-7% microbial carrier. The ecological green rust brick manufactured by this invention can efficiently fix carbon, forming a stable moss-insect symbiotic system within 3 years, reducing manual maintenance; it can adapt to extreme environments, maintaining a high biomass load (85%) even in deserts (high temperature + drought) and frigid zones (<-15℃); its compressive strength is ≥15MPa, and it can be directly used for non-load-bearing exterior walls, vertical greening, and ecological slope protection, and its freeze-thaw durability meets standards.

Description

Technical Field

[0001] This invention relates to the field of eco-brick technology, specifically to an eco-friendly green rust brick and its manufacturing method that combines concrete with microorganisms / lichens. Background Technology

[0002] Green building in a broad sense encompasses the entire field of materials and energy utilization, and developing building materials with the goal of making building facades "green" is a return to the essence of green building.

[0003] There are two traditional greening methods. One is vertical greening of buildings using climbing plants. This involves placing climbing plants and cultivation substrate in planting troughs on the exterior of the building, supported by frames and climbing nets. The entire ecosystem forms a space between the building and the exterior for the growth and maintenance of the climbing plants. This kind of "green" has a certain height, but the entire climbing ecosystem will require huge initial investment and maintenance costs.

[0004] Another type is the "green grass wall" constructed using hollow bricks filled with soil and grass seeds, the planting devices for flowers, grasses, and shrubs installed on walls, fences, and slopes, and the ornamental wall panels made by fixing garden plants in a cultivation substrate. While these commonly used vertical greening methods have brought greenery to the world of reinforced concrete, compared to the height of skyscrapers, these are merely scattered "shrubs." Moreover, whether it's the porous plant growth method where nutrient soil is filled into pre-drilled holes in concrete slabs, or the applied plant growth method where a plant growth substrate composed of cementitious materials, water-retaining agents, fertilizers, and fillers is sprayed onto the concrete surface, these are simply mechanically piecing together ordinary concrete and plants, and cannot be considered as a separate material. Therefore, to achieve the effect of towering, green urban building complexes resembling "primeval forests," a building material that organically combines plants and concrete is urgently needed.

[0005] Materials derived from the organic combination of plants and ordinary concrete through plant growth substrates within the pores of the concrete have garnered widespread attention in recent years. "Plant-grown concrete" refers to concrete or concrete products that use concrete with a specific pore size and porosity as a framework, filling the pores with nutrients necessary for plant growth, allowing plant roots to grow within the pores or penetrate the concrete to grow in the underlying soil.

[0006] Developed in 2001 by Kajima Construction in Japan, vegetation concrete can absorb up to 35% of its own weight in water, while maintaining its strength and reducing its weight by 30%. While enabling urban rooftops to "green," vegetation concrete also helps retain rainwater, conserve energy, reduce emissions, and mitigate the urban heat island effect, showing great promise for future applications.

[0007] Currently, domestic scholars mainly focus on the research of multi-layered structures of planted concrete for supporting the roots of flowers and grasses. Carbonized planted concrete and zeolite planted concrete are both studied for the growth of Bahia grass with a plant height of 30-60cm and a root length of about 30cm. The structure of this plant-supporting material consists of three layers: the top layer is a topsoil layer about 20mm thick, which serves as a sowing medium and reduces water evaporation; the middle layer is a planted concrete layer with interconnected pores that allow water and air to pass through, and the filling material in the pores consists of soil, water-retaining agent, slow-release fertilizer, insecticide, alkali neutralizer, etc.; the bottom layer is soil with pre-filled slow-release fertilizer, which allows the plants that penetrate through the concrete layer to take root and grow.

[0008] Clearly, the above materials are only suitable for the construction of ecological embankments for urban rivers. The organisms supported by vegetation concrete on the exterior walls or roofs of buildings should not be vascular plants, because the roots and stems would have a devastating impact on the materials. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides an eco-friendly green rust brick with a symbiotic relationship between concrete and microorganisms / lichens, as well as a manufacturing method thereof.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] This invention discloses an eco-friendly green rust brick in which concrete and microorganisms / lichens coexist. By weight percentage, it comprises 35%-45% base material, 25%-35% lightweight aggregate, 10%-20% mineral admixture, 10%-15% bioactive additive, and 3%-7% microbial carrier.

[0012] Preferably, the substrate is magnesium phosphate cement, acidic gangue and cow dung fiber, the lightweight aggregate is expanded shale, the mineral admixture is diatomaceous earth and fly ash, the bioactive additive is corrosive acid, vermiculite and calcium carbonate, and the microbial carrier is cyanobacteria, green algae and lichen spores.

[0013] Preferably, the mass ratio of magnesium phosphate cement, acidic gangue and cow dung fiber is 1:(0.8-1.2):(0.3-0.7), the mass ratio of diatomaceous earth and fly ash is (1.5-2.5):1, the mass ratio of corrosive acid, vermiculite and calcium carbonate is 3:(4-6):(1-3), and the mass ratio of cyanobacteria, green algae and lichen spores is (0.8-1.2):(0.8-1.2):(0.8-1.2).

[0014] Preferably, the magnesium phosphate cement has a pH of 7-8, the acidic gangue has a pH of 3-5, the cow dung fiber has a length of 5-10 mm, the expanded shale has a particle size of 3-5 mm, and a porosity of ≥40%.

[0015] Accordingly, a method for manufacturing an eco-friendly green rust brick with symbiosis between concrete and microorganisms / lichens includes the following steps:

[0016] (1) Dry materials: Mix the base material, lightweight aggregate and mineral admixture evenly;

[0017] (2) Wet material: Add bioactive additives to water, and then add 0.5% sodium alginate to form a viscous solution;

[0018] (3) Pour the wet material into the dry material, stir to form a uniform slurry, spray the slurry with a microbial suspension prepared by the microbial carrier, continue stirring, pour into a custom mold, and vibrate to compact;

[0019] (4) Cover with damp burlap and cure at 20°C for 7 days. During the curing period, maintain 95% humidity and spray with nutrient solution for 14 days until green fungal spots are visible on the surface.

[0020] Preferably, in step (3), the colony count in the microbial suspension is 10. 6 CFU / mL.

[0021] Preferably, in step (4), the nutrient solution is BG-11 culture medium diluted 10 times.

[0022] Preferably, in step (1), the substrate is magnesium phosphate cement, acidic coal gangue, and cow dung fiber. The magnesium phosphate cement is passed through an 80-mesh sieve and soaked in a 0.1 mol / L lactic acid solution for 12 hours to eliminate surface alkalinity and maintain pH stability. After curing, the pH is 6.5-7.2. The cement is then dehydrated using a centrifuge until the moisture content is ≤10%. The acidic coal gangue is passed through an 80-mesh sieve. The cow dung fiber is pretreated by washing, cooking, and drying, and then pulverized to 5-10 mm with a diameter of 10-50 μm.

[0023] Preferably, in step (1), the lightweight aggregate is expanded shale, and 0.02% rosin soap solution is added to the expanded shale to make the porosity of the expanded shale ≥25% and the pore size 50-300μm.

[0024] Preferably, when using the manufactured eco-friendly green rust bricks, breathable bonding mortar containing 10% perlite is used for masonry, and the joint width is ≤5mm; water is sprayed once a week in the early stage of wall formation.

[0025] The present invention has the following beneficial effects:

[0026] 1. This invention is applicable to non-load-bearing decorative layers of building facades, sound barriers for urban elevated bridges, and rooftop greening substrates. It transforms concrete from "gray infrastructure" into a "living ecological interface," possessing both carbon sequestration and aesthetic value-added functions, providing a key technology for future carbon-neutral buildings. Algae, fungi, and lichens, among other organisms, have vascular systems (xylem and phloem), do not need to absorb water and mineral salts from soil, and lack nutrient organs such as roots, stems, and leaves. They can grow in extreme environments such as hot springs, deserts, salt lakes, polar regions, and even on nutrient-poor rocks such as cultural sculptures and monuments. Implanting these organisms into building facade materials, creating a "green rust" effect on the surface of the material—a cutting-edge direction for green building development that combines ecology, economy, and aesthetics. This bio-green rust transforms the monotonous gray-brown exterior walls of buildings and the harshness of artificial paint. The mottled green exudes vitality, with varying heights and layers extending the green towards the sky, blending seamlessly with mountains and rivers in various shapes and forms. While contributing to the creation of forest cities, this green rust also plays a role in CO2 fixation and emission reduction in the urban atmosphere. This "breathable green" creates architecture that coexists harmoniously with nature.

[0027] 2. This invention provides a green building material based on highly biocompatible concrete and microbial / lichen symbiosis—Eco-Green Rust Brick (EGRB)—and its manufacturing method. By optimizing the selection and proportion of raw materials, it becomes an ideal colonization substrate for microorganisms and lichens, thereby achieving a biocompatibility index (BI) ≥ 50 μg chlorophyll a / m³. 2 At the same time, the compressive strength of the material is maintained at ≥15MPa to meet the structural requirements of non-load-bearing walls in buildings. This ecological green rust brick has multiple ecological and engineering advantages: (1) Environmental benefits: the annual carbon sequestration of each square meter of brick can reach 1.2kg CO2 (mainly contributed by cyanobacteria photosynthesis); (2) Thermal performance: the outer surface temperature in summer is 3-8℃ lower than that of ordinary bricks, thanks to the transpiration cooling effect of microbial communities; (3) In terms of biocompatibility: the porous structure of the brick (chlorophyll fluorescence index FI>0.8) can provide a deep colonization environment for microorganisms (colonization depth up to 5-10mm), and a micro-ecosystem containing moss and insects can be spontaneously formed within 3 years; (4) Mechanical performance: professional tests have confirmed that it has excellent load stability and durability, fully meeting the application requirements of decorative walls. It is worth noting that the material can maintain stable biological colonization capacity under extreme climatic conditions such as high temperature (>40℃), drought (humidity <30%) and cold (<-15℃), with a maximum biological load rate of up to 85% and a material strength damage rate of less than 10%, demonstrating good environmental adaptability.

[0028] 3. This invention creates a "susceptible matrix" with a biocompatibility index (BI) ≥ 50 μg chlorophyll a / m³ by controlling the mineral composition of concrete (e.g., using low-alkali cement and porous tuff), pore structure (CT scan porosity ≥ 25%, pore size 50-300 μm), and pH value (6.5-7.2). 2 This provides an ideal growth environment for microorganisms / lichens. However, most existing vegetation concrete is mechanically assembled from ordinary concrete without specifically optimizing the matrix characteristics.

[0029] 4. The eco-friendly green rust bricks manufactured by this invention have a compressive strength ≥15MPa, meeting the standards for non-load-bearing walls in buildings, while avoiding structural damage caused by microbial colonization. In existing technologies, plant roots and stems may penetrate concrete, causing structural damage, while the lichen and other biological non-vascular systems selected in this invention do not damage the material structure.

[0030] 5. The eco-friendly green rust bricks manufactured by this invention have outstanding ecological benefits and significant carbon sequestration capacity; highly efficient carbon fixation: per m³ 2 Green rust bricks have an annual carbon sequestration capacity of approximately 1.2 kg CO2. Through cyanobacteria photosynthesis, they drive the carbon sequestration process, contributing to carbon-neutral buildings. Traditional vertical greening methods do not address carbon sequestration efficiency and rely heavily on plant species. Furthermore, within three years, they can spontaneously attract moss, insects, and other organisms to form a micro-ecosystem, exhibiting superior biodiversity compared to existing vegetated concrete. Attached Figure Description

[0031] Figure 1 The chlorophyll a content of green rust bricks at 25℃;

[0032] Figure 2 Microscopic section at a depth of 5 mm for biological colonization on green rust brick. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Unless otherwise specified, the technical means used in the implementation examples are conventional means well known to those skilled in the art.

[0035] This invention discloses an eco-friendly green rust brick in which concrete and microorganisms / lichens coexist. By weight percentage, it comprises 35%-45% base material, 25%-35% lightweight aggregate, 10%-20% mineral admixture, 10%-15% bioactive additive, and 3%-7% microbial carrier.

[0036] The substrate comprises magnesium phosphate cement, acidic gangue, and cow dung fiber in a mass ratio of 1:(0.8-1.2):(0.3-0.7). The lightweight aggregate is expanded shale with a particle size of 3-5 mm and a porosity ≥40%. The mineral admixture is diatomaceous earth and fly ash in a mass ratio of (1.5-2.5):1. The bioactive additive is corrosive acid, vermiculite, and calcium carbonate in a mass ratio of 3:(4-6):(1-3). The microbial carrier is cyanobacteria, green algae, and lichen spores in a mass ratio of (0.8-1.2):(0.8-1.2):(0.8-1.2).

[0037] Furthermore, the magnesium phosphate cement has a pH of 7-8, the acidic gangue has a pH of 3-5, and the cow dung fiber has a length of 5-10 mm and a diameter of 10-50 μm.

[0038] This invention uses low-alkali cement (such as magnesium phosphate cement) and cow dung fiber in a specific ratio to control the pH within the acidic range, eliminating the inhibitory effect of alkalinity on microorganisms and forming a "susceptible matrix" suitable for lichen / algae growth. Simultaneously, this invention regulates the concrete porosity to ≥25% and pore size to 50-300μm through the use of lightweight aggregates (expanded shale, particle size 3-5mm, porosity ≥40%) and mineral admixtures (diatomaceous earth + fly ash), balancing water permeability and air permeability with space for microbial colonization.

[0039] This invention constructs a bioactive system, specifically: a synergistic effect of compound additives: humic acid (slow-release nutrients), vermiculite (water retention), calcium carbonate (pH buffer), and microbial carriers (cyanobacteria, green algae, and lichen spores) are combined to form a self-sustaining ecosystem requiring no additional nutrient input. Microbial colonization technology: through spore suspension (10... 6 Spraying with CFU / mL and monitoring with a chlorophyll fluorescence meter (FI>0.8) ensures deep colonization of microorganisms within the substrate, improving carbon fixation efficiency (annual carbon fixation ≈ 1.2 kg CO2 / m³). 2 ).

[0040] The cow dung fiber used in this invention contains natural cellulose (30-40%) and lignin (15-20%). Upon contact with water, it swells to form a colloidal network that wraps around stone powder particles and the shale surface, enhancing interfacial adhesion. Pull-out tests verified that adding 5% cow dung fiber increased the stone powder-shale interfacial adhesion strength from 0.8 MPa to 1.5 MPa. The pores of the cow dung fiber itself (10-50 μm in diameter) and the expanded shale (50-300 μm) form a multi-level pore system. CT scans show a total porosity ≥28%, meeting the requirements for microbial colonization.

[0041] This invention also discloses a method for manufacturing eco-friendly green rust bricks that are a symbiotic relationship between concrete and microorganisms / lichens, comprising the following steps:

[0042] (1) Dry materials: The base material, lightweight aggregate, and mineral admixtures are mixed evenly. The base material consists of magnesium phosphate cement, acidic coal gangue, and cow dung fiber. The magnesium phosphate cement is passed through an 80-mesh sieve and soaked in a 0.1 mol / L lactic acid solution for 12 hours to eliminate surface alkalinity and maintain pH stability. After curing, the pH is 6.5-7.2. The cement is then dehydrated using a centrifuge until the moisture content is ≤10%. The acidic coal gangue is passed through an 80-mesh sieve. The cow dung fiber is pretreated by washing, cooking, and drying, and then pulverized to 5-10 mm with a diameter of 10-50 μm. The lightweight aggregate is expanded shale. A 0.02% rosin soap solution is added to the expanded shale to make the porosity of the expanded shale ≥25% and the pore size 50-300 μm.

[0043] (2) Wet material: Add bioactive additives to water, and then add 0.5% sodium alginate to form a viscous solution.

[0044] (3) Pour the wet material into the dry material, stir to form a uniform slurry, spray the slurry with a microbial suspension prepared by the microbial carrier, continue stirring, pour into a custom mold, and vibrate to compact; the microbial suspension has a colony count of 10. 6 CFU / mL.

[0045] (4) Cover with damp burlap and incubate at 20°C for 7 days. During the incubation period, maintain 95% humidity and spray with nutrient solution for 14 days until green bacterial spots are visible on the surface. The nutrient solution is BG-11 culture medium diluted 10 times.

[0046] (5) When using the manufactured ecological green rust bricks, use breathable bonding mortar containing 10% perlite and mortar joint width ≤ 5mm for masonry; spray water once a week in the early stage of wall formation.

[0047] The present invention will be further described below with reference to specific embodiments.

[0048] Example

[0049] A method for manufacturing an eco-friendly green rust brick based on the symbiosis of concrete and microorganisms / lichens includes the following steps:

[0050] Weigh the materials according to the following percentages: 40% base material, 30% lightweight aggregate, 15% mineral admixture, 10% bioactive additive, and 5% microbial carrier. The base material consists of magnesium phosphate cement, acidic gangue, and cow dung fiber in a mass ratio of 1:1:0.5. The lightweight aggregate is expanded shale with a particle size of 3-5 mm and a porosity ≥40%. The mineral admixture consists of diatomaceous earth and fly ash in a mass ratio of 2:1. The bioactive additive consists of corrosive acid, vermiculite, and calcium carbonate in a mass ratio of 3:5:2. The microbial carrier consists of cyanobacteria, green algae, and lichen spores in a mass ratio of 1:1:1.

[0051] (1) Dry materials:

[0052] 1.1 The magnesium phosphate cement is passed through an 80-mesh sieve and soaked in a 0.1 mol / L lactic acid solution for 12 hours to eliminate surface alkalinity and maintain pH stability. After curing, the pH is 6.5-7.2. The cement is then dehydrated using a centrifuge until the moisture content is ≤10%.

[0053] 1.2 The acidic coal gangue is passed through an 80-mesh sieve;

[0054] 1.3 The cow dung fiber is pretreated by washing, steaming, and drying, and then crushed to 5-10 mm. The interlacing of the fibers increases their strength.

[0055] 1.4 Expanded Shale: Add 0.02% rosin soap solution to expanded shale to make the porosity of expanded shale ≥25% and the pore size 50-300μm.

[0056] 1.5 Diatomaceous earth is used to improve porosity, and the active SiO2 in fly ash can promote microbial attachment.

[0057] The above-mentioned base materials (magnesium phosphate cement + acidic coal gangue + cow dung fiber), lightweight aggregate (expanded shale), and mineral admixtures (diatomite + fly ash) are mixed evenly.

[0058] (2) Wet material: Add slow-release humic acid, water-retaining vermiculite, and calcium carbonate to adjust the pH to 6.5-7.5 to water, and then add 0.5% sodium alginate to form a viscous solution.

[0059] (3) Pour the wet material into the dry material and stir for 8±3 minutes to form a uniform slurry (water-cement ratio of 0.28). Spray the slurry with a microbial suspension prepared by the microbial carrier (colony count of 10). 6 CFU / mL), continue stirring for 2-5 minutes, pour into a custom mold (e.g., brick size 240×115×53mm), vibrate and compact, then scrape out a biomimetic rough texture (Ra=50-100μm) on the surface.

[0060] (4) Cover with damp burlap and cure at 20°C for 7 days. During the curing period, maintain 95% humidity to promote cement hydration. Move to a light incubator (simulate natural day and night cycle) and spray with nutrient solution (BG-11 medium diluted 10 times) to activate microorganisms. Continue for 14 days until green bacterial spots are visible on the surface.

[0061] (5) When using the manufactured ecological green rust bricks, use breathable bonding mortar containing 10% perlite and mortar joint width ≤ 5mm for masonry; spray water once a week in the early stage of wall formation (within 3 months) (drip irrigation tape can be added in dry summer areas).

[0062] After the eco-friendly green rust bricks were manufactured, their performance was verified using the test methods shown in Table 1 below. The results show that the eco-friendly green rust bricks manufactured in this invention can achieve highly efficient carbon sequestration: 1m 2 Brickwork = 1.2 kg CO2 / year ≈ 12 m³ 2 The carbon sequestration capacity of ordinary lawns is estimated at 0.1 kg / m² / year; it also exhibits micro-ecological self-assembly: forming a stable moss-insect symbiotic system within 3 years, reducing manual maintenance. It can adapt to extreme environments, maintaining a high biomass load (85%) even in deserts (high temperature + drought) and frigid zones (<-15℃). Its compressive strength is ≥15 MPa, making it suitable for direct use in non-load-bearing exterior walls, vertical greening, and ecological slope protection, with freeze-thaw durability meeting standards. If it replaces 1000m... 2 Traditional brick walls have an annual carbon sequestration capacity of approximately 1.2 tons of CO2, equivalent to the carbon sequestration capacity of 80 mature trees (based on 15 kg / tree / year). Green rust bricks, at 25℃, have a chlorophyll a content as follows... Figure 1 As shown, a microscopic section of a green rust brick at a colonization depth of 5 mm is shown. Figure 2 As shown in the figure, the results indicate that the chlorophyll a content is greater than 70 mg / 100 g, and the microorganisms have successfully colonized.

[0063] The resurgence, survival, and mortality times / probabilities of algae are shown in Tables 2 and 3. The results show that algal resurgence is significantly affected by temperature, humidity, and drought duration, and the difficulty of algal survival increases with the duration of drought. Furthermore, higher temperatures and longer drought durations make algal survival more difficult. Moreover, at low temperatures, lower temperatures and longer drought durations have a greater adverse impact on algal survival.

[0064] Table 1 Performance Verification Indicators

[0065]

[0066]

[0067] Table 2 Algal Resurgence Status

[0068]

[0069] Table 3. Time / Probability of Algal Survival and Mortality

[0070]

[0071] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An eco-friendly green rust brick in which concrete coexists with microorganisms / lichens, characterized in that: By weight percentage, it includes 35%-45% base material, 25%-35% lightweight aggregate, 10%-20% mineral admixture, 10%-15% bioactive additive, and 3%-7% microbial carrier; The substrate is magnesium phosphate cement, acidic gangue and cow dung fiber, the lightweight aggregate is expanded shale, the mineral admixture is diatomite and fly ash, the bioactive additive is corrosive acid, vermiculite and calcium carbonate, and the microbial carrier is cyanobacteria, green algae and lichen spores. The mass ratio of magnesium phosphate cement, acidic gangue, and cow dung fiber is 1:(0.8-1.2):(0.3-0.7), the mass ratio of diatomaceous earth and fly ash is (1.5-2.5):1, the mass ratio of corrosive acid, vermiculite, and calcium carbonate is 3:(4-6):(1-3), and the mass ratio of cyanobacteria, green algae, and lichen spores is (0.8-1.2):(0.8-1.2):(0.8-1.2).

2. The ecological green rust brick of concrete and microorganisms / lichen symbiosis according to claim 1, characterized in that: The magnesium phosphate cement has a pH of 7-8, the acidic gangue has a pH of 3-5, the cow dung fiber has a length of 5-10 mm, the expanded shale has a particle size of 3-5 mm, and a porosity of ≥40%.

3. A method for manufacturing an eco-friendly green rust brick based on the symbiosis of concrete and microorganisms / lichens as described in claim 1, characterized in that: Includes the following steps: (1) Dry materials: The base material, lightweight aggregate, and mineral admixture are mixed evenly; the base material is magnesium phosphate cement, acidic gangue and cow dung fiber. The magnesium phosphate cement is passed through an 80-mesh sieve and soaked in a 0.1 mol / L lactic acid solution for 12 hours to eliminate surface alkalinity and maintain pH stability. After curing, the pH is 6.5-7.

2. The cement is dehydrated by centrifuge until the moisture content is ≤10%; the acidic gangue is passed through an 80-mesh sieve; the cow dung fiber is washed, cooked, dried and pretreated and then crushed to 5-10 mm with a diameter of 10-50 μm; the lightweight aggregate is expanded shale. 0.02% rosin soap solution is added to the expanded shale to make the porosity of the expanded shale ≥25% and the pore size 50-300 μm; (2) Wet material: Add bioactive additives to water, and then add 0.5% sodium alginate to form a viscous solution; (3) Pour the wet material into the dry material, stir to form a uniform slurry, spray the slurry with a microbial suspension prepared by the microbial carrier, continue stirring, pour into a custom mold, and vibrate to compact; (4) Cover with damp burlap and cure at 20°C for 7 days. During the curing period, maintain 95% humidity and spray with nutrient solution for 14 days until green fungal spots are visible on the surface.

4. The manufacturing method according to claim 3, characterized in that: In step (3), the colony count in the microbial suspension is 10. 6 CFU / mL.

5. The manufacturing method according to claim 3, characterized in that: In step (4), the nutrient solution is BG-11 culture medium diluted 10 times.

6. The manufacturing method according to any one of claims 3-5, characterized in that: When using the manufactured eco-friendly green rust bricks, use breathable bonding mortar containing 10% perlite, and lay the bricks with a joint width of ≤5mm; spray water once a week during the initial stage of wall formation.

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