CN117003542A - Preparation method of bio-based polyurethane foam soil - Google Patents
Preparation method of bio-based polyurethane foam soil Download PDFInfo
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- CN117003542A CN117003542A CN202311056079.5A CN202311056079A CN117003542A CN 117003542 A CN117003542 A CN 117003542A CN 202311056079 A CN202311056079 A CN 202311056079A CN 117003542 A CN117003542 A CN 117003542A
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- polyurethane foam
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- based polyurethane
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- fine aggregate
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- 229920005830 Polyurethane Foam Polymers 0.000 title claims abstract description 67
- 239000011496 polyurethane foam Substances 0.000 title claims abstract description 67
- 239000002689 soil Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- 241000193830 Bacillus <bacterium> Species 0.000 claims abstract description 18
- 239000006260 foam Substances 0.000 claims abstract description 13
- 239000000725 suspension Substances 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 10
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 230000001580 bacterial effect Effects 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 235000016709 nutrition Nutrition 0.000 claims abstract description 4
- 230000035764 nutrition Effects 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000011049 filling Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 12
- 229960005069 calcium Drugs 0.000 claims description 9
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004202 carbamide Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001963 growth medium Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000009630 liquid culture Methods 0.000 claims description 5
- 239000001888 Peptone Substances 0.000 claims description 3
- 108010080698 Peptones Proteins 0.000 claims description 3
- 238000002835 absorbance Methods 0.000 claims description 3
- 235000015278 beef Nutrition 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000011081 inoculation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 235000019319 peptone Nutrition 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims description 2
- 239000001639 calcium acetate Substances 0.000 claims description 2
- 235000011092 calcium acetate Nutrition 0.000 claims description 2
- 229960005147 calcium acetate Drugs 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 229960002713 calcium chloride Drugs 0.000 claims description 2
- 235000011148 calcium chloride Nutrition 0.000 claims description 2
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 claims description 2
- 239000001527 calcium lactate Substances 0.000 claims description 2
- 229960002401 calcium lactate Drugs 0.000 claims description 2
- 235000011086 calcium lactate Nutrition 0.000 claims description 2
- 235000015097 nutrients Nutrition 0.000 claims description 2
- 239000002609 medium Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 15
- 230000003321 amplification Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000033558 biomineral tissue development Effects 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000004566 building material Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000009928 pasteurization Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 210000000497 foam cell Anatomy 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000037358 bacterial metabolism Effects 0.000 description 1
- HNYOPLTXPVRDBG-UHFFFAOYSA-N barbituric acid Chemical compound O=C1CC(=O)NC(=O)N1 HNYOPLTXPVRDBG-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/08—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
- C04B16/082—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons other than polystyrene based, e.g. polyurethane foam
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P3/00—Preparation of elements or inorganic compounds except carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/07—Bacillus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Microbiology (AREA)
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- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Biomedical Technology (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a foam soil material, in particular to a preparation method of bio-based polyurethane foam soil. The preparation method of the bio-based polyurethane foam soil comprises the following steps: (1) Cleaning, airing and crushing the recycled polyurethane foam to obtain polyurethane foam particles; (2) airing and sieving the fine aggregate to obtain air-dried fine aggregate; (3) Performing amplification culture on the bacillus pasteurizer, and performing centrifugal concentration to obtain bacillus pasteurizer suspension; (4) Adding fly ash into air-dried fine aggregate, adding bacterial suspension, uniformly mixing, adding polyurethane foam particles, a nutrition source and a calcium source, uniformly mixing, and filling into a mould for maintenance to obtain the bio-based polyurethane foam soil. The invention has the advantages of small dosage of soil material, low cost, excellent performance and no secondary pollution.
Description
Technical Field
The invention relates to a foam soil material, in particular to a preparation method of bio-based polyurethane foam soil.
Background
In recent years, along with the acceleration of engineering construction in China and the implementation of the national and regional soil and stone resource limited mining policies, the supply of engineering backfill materials is increasingly tense, the light research of building materials for saving materials is carried out, and the new time value of the building materials is more urgent to excavate. At present, light building material development is mainly focused on the field of cement-based materials, including foamed concrete and filled light concrete. The foaming concrete is formed by introducing a foaming agent, and has low density, light dead weight and excellent anti-seismic performance, but has lower compressive strength; the filled lightweight concrete is prepared by doping lightweight aggregates such as pumice, volcanic ash, ceramsite and the like, and the doped composite material has poor mechanical property and durability. Polyurethane foam is used as a structural material and a heat insulating material with good performance, is widely applied to the fields of home, transportation, construction, sports, machinery, aviation, medical treatment and the like, and the application range and the use amount of the polyurethane foam are increased, so that the quantity of waste foam is increased sharply, and new environmental problems are brought about by large-scale incineration landfill treatment.
In recent years, the construction of 'no-waste city' is proposed, and new requirements are put forward for the treatment of social domestic garbage. Microorganism mineralization is used as a leading edge hot spot of global transportation infrastructure technical research, has the environmental advantages which are not possessed by the traditional cement-based materials, and bacteria used for mineralization show good affinity and adaptability in soil bodies, become a novel cementing means for replacing the traditional materials such as cement-based materials, and have many researches on soil body solidification, but the strength of the biological solidification material depends on the oxygen content of surrounding environment, and the growth metabolism of microorganisms is limited by the anaerobic environment formed in deep space, especially inside, so that the strength development of biological fillers is restricted.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a preparation method of bio-based polyurethane foam soil. The method has the advantages of small soil material consumption, low cost, excellent performance and no secondary pollution.
The invention is realized in such a way that the preparation method of the bio-based polyurethane foam soil comprises the following steps:
(1) Cleaning and airing the recycled polyurethane foam, and crushing the recycled polyurethane foam by a foam crushing granulator to obtain polyurethane foam particles;
(2) Airing and sieving the fine aggregate to obtain air-dried fine aggregate;
(3) Inoculating the bacillus pasteurizer into a liquid culture medium, performing shake culture at constant temperature, and performing centrifugal concentration by using a centrifugal machine to obtain bacillus pasteurizer suspension;
(4) Adding fly ash into air-dried fine aggregate, adding bacillus barbituric suspension, stirring uniformly, adding polyurethane foam particles, a nutrition source and a calcium source, mixing uniformly, filling into a mould, compacting, and curing to obtain the bio-based polyurethane foam soil.
The preparation method of the bio-based polyurethane foam soil comprises the following steps of (1) finely crushing and discharging particles with the diameter of 0.5-1.0 mm by a foam crushing granulator.
The preparation method of the bio-based polyurethane foam soil comprises the step (2) of the fine aggregate non-uniformity coefficient C u =25.85, the screen mesh diameter for sieving was 2mm, and the water content of the obtained air-dried fine aggregate was 1.4%.
In the preparation method of the bio-based polyurethane foam soil, in the step (3), the liquid culture medium comprises 1L of deionized water, 20g of urea, 5g of peptone and 3g of beef extract, wherein the pH=7.0.
According to the preparation method of the bio-based polyurethane foam soil, the inoculation rate of the bacillus pasteurization bacteria liquid is 1%, the constant-temperature shake culture temperature is 30 ℃, the shake rate is 170r/min, the culture time is 24 hours, the centrifugal concentration rate is 5000r/min, the stirring time is 10 minutes, and the absorbance value of the bacillus pasteurization suspension at 600nm wavelength is 1.4-1.6.
The preparation method of the bio-based polyurethane foam soil comprises the following steps of (4) 52-64 parts of air-dried fine aggregate, 12-24 parts of fly ash, 2.4-2.7 parts of hard polyurethane foam particles, 40 parts of bacillus pasteurizus suspension, 6 parts of urea and 11 parts of calcium source.
The preparation method of the bio-based polyurethane foam soil comprises the step (4) that the fly ash is secondary fly ash.
The nutrient source in the step (4) is urea, and the calcium source is one or more of calcium acetate, calcium lactate and calcium chloride.
The preparation method of the bio-based polyurethane foam soil comprises the following steps of (4) stirring at a speed of 500r/min for 15min.
The preparation method of the bio-based polyurethane foam soil comprises the step (4) of compacting the polyurethane foam soil into 3 layers, wherein the real number of each layer is 30.
The curing temperature in the step (4) is 30 ℃, the curing humidity is 90%, and the curing time is 7d.
Compared with the prior art, the invention has the following advantages:
according to the invention, polyurethane foam particles are doped, and the microorganism mineralized crystals and the fine aggregate are adsorbed on the surfaces of the foam particles to form a large number of closed pores, so that the convection heat transfer between air is reduced, the heat preservation and insulation performance of the light building material is improved, meanwhile, the density of foam soil is effectively reduced due to the existence of the pores, and the production material is saved; the foam soil of the invention has a large amount of closed pores to form an aerobic space, so as to provide sufficient oxygen supply for bacterial metabolism, accelerate the mineralization and crystallization processes of microorganisms and effectively improve the strength. The invention adopts the microorganism mineralization to replace cement hydration reaction for soil body cementation, and avoids the erosion effect of cement-based materials on soil body environment while providing effective cementation strength, thereby being more environment-friendly in the production process.
Drawings
FIG. 1 is a graph showing the compressive strength of biofoam clay at various fly ash loadings;
FIG. 2 is a graph showing the relationship between the compressive strength and density of the biofoam clay at different polyurethane foam particle loadings.
Detailed Description
The present invention will be further described with reference to the accompanying drawings
The bio-based polyurethane foam soil disclosed by the invention comprises the following raw materials in parts by weight: 52-64 parts of fine aggregate, 12-24 parts of fly ash, 2.4-2.7 parts of polyurethane foam particles, 40 parts of bacillus pasteurization bacteria liquid, 6 parts of urea and 11 parts of calcium source. According to the invention, polyurethane foam particles and fine aggregate are consolidated and solidified through a microbial mineralization technology, so that a consolidated framework of polyurethane foam soil is formed.
Example 1
(1) Placing the recycled polyurethane foam in a rinsing water tank, adding an equal volume of clear water, rinsing for 20min, placing the polyurethane foam in an outdoor air-curing machine for 2d, wherein the outdoor temperature is 25-35 ℃, adding the air-cured polyurethane foam into a foam crushing granulator for crushing and granulating, and the diameter of finely crushed discharge particles of the foam crushing granulator is 0.5-1.0 mm, so as to obtain polyurethane foam particles;
(2) Placing red sandstone soil outdoors for airing for 2 days, wherein the outdoor temperature is 25-35 ℃, obtaining air-dried red sandstone soil, adding the air-dried red sandstone soil into a screening machine, screening for 3min, and obtaining air-dried fine aggregate, wherein the aperture of a screen is 2 mm;
(3) Inoculating Bacillus pasteurizer into liquid culture medium, wherein initial concentration of Bacillus pasteurizer is 8.6-10 9 cfu/mL, wherein the liquid culture medium is 1L deionized water, 20g urea, 5g peptone and 3g beef extract, the inoculation rate is 1%, the constant-temperature shake culture is carried out for 24 hours, the culture temperature is 30 ℃, the shake rate is 170r/min, the cultured bacterial liquid is placed in a refrigerated centrifuge for centrifugal concentration, the centrifugal rate is 5000r/min, the centrifugal time is 10min, the bacillus pasteurizus suspension is obtained, and the absorbance value of the bacterial liquid at 600nm wavelength is 1.4-1.6;
(4) Adding 12 parts of fly ash into a stirrer, wherein the fly ash is secondary fly ash, 64 parts of air-dried fine aggregate, 40 parts of bacillus barbitarus suspension, stirring uniformly at a stirring speed of 300r/min and a stirring time of 5min, adding 2.4 parts of polyurethane foam particles, adding 6 parts of urea and 11 parts of calcium source, stirring uniformly at a stirring speed of 300r/min and a stirring time of 10min, pouring into a mould, compacting three layers of the mould with an inner diameter of 39mm and a height of 80mm for 30 times, curing in a curing box after compacting, wherein the curing temperature is 30 ℃, the curing humidity is 90%, and the curing time is 7d, thus obtaining the bio-based polyurethane foam soil, and analyzing the compressive strength.
Example 2
The difference from example 1 is that the amount of fly ash added in step (4) was 16 parts and the amount of air-dried fine aggregate added was 60 parts.
Example 3
The difference from example 1 is that the amount of fly ash added in step (4) was 20 parts and the amount of air-dried fine aggregate added was 56 parts.
Example 4
The difference from example 1 was only that the fly ash added in the step (4) was 24 parts and the air-dried fine aggregate added in 52 parts.
Example 5
The difference from example 1 was only that the polyurethane foam particles were added in an amount of 2.7 parts in step (4).
Example 6
The difference from example 2 was only that the polyurethane foam particles were added in an amount of 2.7 parts in step (4).
Example 7
The difference from example 3 was only that the polyurethane foam particles were added in an amount of 2.7 parts in step (4).
Example 8
The difference from example 4 was only that the polyurethane foam particles were added in an amount of 2.7 parts in step (4).
The foam soil prepared in each example was subjected to compressive strength test according to JTG3430-2020, highway geotechnical test procedure, and the results are shown in FIGS. 1 and 2. As shown in FIG. 1, the invention has the maximum compressive strength when the mixing amount of the fly ash is 16 parts, and the fly ash fills the pores, so that the bio-based polyurethane foam soil is more compact and has improved strength. With increasing foam doping, the density of the bio-based polyurethane foam is smaller, and the strength reduction degree is far smaller than the density reduction degree. As can be seen from FIG. 2, the density was maximized and the compressive strength properties were optimized when the amount of the polyurethane foam particles was 2.7 parts.
The polyurethane foam has a foam cell structure generated by the comprehensive reaction of isocyanate, polyol and foaming agent, and the gas phase fills the foam cells to form an aerobic space in the soil body, so as to provide stable oxygen supply for bacterial growth. The bio-based polyurethane foam soil combines the double advantages of microbial mineralization, green and environment protection and light and stable polyurethane foam, and has more advantages in popularization and application of building backfill materials.
Claims (10)
1. The preparation method of the bio-based polyurethane foam soil is characterized by comprising the following steps of:
(1) Cleaning and airing the recycled polyurethane foam, and crushing the recycled polyurethane foam by a foam crushing granulator to obtain polyurethane foam particles;
(2) Airing and sieving the fine aggregate to obtain air-dried fine aggregate;
(3) Inoculating the bacillus pasteurizer into a liquid culture medium, performing shake culture at constant temperature, and performing centrifugal concentration by using a centrifugal machine to obtain bacillus pasteurizer suspension;
(4) Adding the fly ash into air-dried fine aggregate, adding the bacterial suspension, stirring uniformly, sequentially adding polyurethane foam particles, a nutrition source and a calcium source, mixing uniformly, filling into a mould, compacting, and curing to obtain the bio-based polyurethane foam soil.
2. The method for preparing bio-based polyurethane foam according to claim 1, wherein the polyurethane foam particles obtained in the step (1) are 0.5-1.0 mm.
3. The method for producing a bio-based polyurethane foam according to claim 1, wherein the fine aggregate non-uniformity coefficient in the step (2) is C u =25.85, the mesh diameter of the screen for sieving was 2mm, and the water content of the obtained air-dried fine aggregate was 1.4%.
4. The method for preparing bio-based polyurethane foam according to claim 1, wherein the liquid medium in the step (3) comprises 1L of deionized water, 20g of urea, 5g of peptone and 3g of beef extract, and the ph=7.0.
5. The preparation method of the bio-based polyurethane foam according to claim 1, wherein the inoculation rate of the bacillus pasteurizer in the step (3) is 1%, the constant temperature shake culture temperature is 30 ℃, the shake rate is 170r/min, the culture time is 24 hours, the centrifugal concentration rate is 5000r/min, the centrifugal time is 10min, and the absorbance value of the obtained bacillus pasteurizer suspension at the wavelength of 600nm is 1.4-1.6.
6. The preparation method of the bio-based polyurethane foam according to claim 1, wherein in the step (4), 52-64 parts of air-dried fine aggregate, 12-24 parts of fly ash, 2.4-2.7 parts of polyurethane foam particles, 40 parts of bacillus pasteurizus suspension, 6 parts of nutrition source, 11 parts of calcium source and the mass parts of the calcium source.
7. The method for preparing bio-based polyurethane foam according to claim 1, wherein the fly ash in the step (4) is secondary fly ash.
8. The method for preparing bio-based polyurethane foam according to claim 1, wherein the nutrient source in the step (4) is urea; the calcium source is one or more of calcium acetate, calcium lactate and calcium chloride.
9. The method for preparing bio-based polyurethane foam according to claim 1, wherein the stirring speed in the step (4) is 500r/min and the stirring time is 15min.
10. The method for preparing bio-based polyurethane foam according to claim 1, wherein the compacting in the step (4) is performed in 3 layers, the number of times of compacting per layer is 30, the curing temperature is 30 ℃, the curing humidity is 90%, and the curing time is 7d.
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