CN115340313A - Method for strengthening recycled aggregate by physical compound microbial technology - Google Patents
Method for strengthening recycled aggregate by physical compound microbial technology Download PDFInfo
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- CN115340313A CN115340313A CN202210049827.6A CN202210049827A CN115340313A CN 115340313 A CN115340313 A CN 115340313A CN 202210049827 A CN202210049827 A CN 202210049827A CN 115340313 A CN115340313 A CN 115340313A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
Abstract
The invention discloses a method for reinforcing recycled aggregate by a physical compound microbiological technology. Mixing the recycled aggregate with the solid steel ball, taking out the steel ball after stirring, and screening out recycled aggregate particles with small particle size to obtain the mechanically ground recycled aggregate; and then placing the mixture into a container, pouring the prepared microbial liquid, and treating to obtain the recycled aggregate reinforced by the physical compound microbial technology. The invention obviously improves the technical performance of the recycled aggregate under the physical, biological and physical biological synergistic action, which is characterized in that the apparent density is improved, the water absorption rate is reduced, the crushing index is reduced, and the particle morphology is optimized.
Description
Technical Field
The invention belongs to a recycled aggregate strengthening method in the technical field of building materials, and particularly relates to a method for strengthening recycled aggregates by a physical composite microbial technology.
Background
With the continuous promotion of urbanization in China, natural resources such as sand, stones and the like are greatly consumed. Meanwhile, a large number of buildings which do not meet development requirements are or are facing to be removed, and a large amount of demolition waste is generated. According to estimation, the quantity of demolition waste generated in China is about 15.5-25.5 hundred million tons each year, and the quantity of the demolition waste accumulated without treatment is more than 200 hundred million tons. At present, due to shortage of natural gravels, high-value resource utilization of construction demolition garbage is emphasized, the construction demolition garbage is processed into recycled aggregate, and the recycled aggregate partially or completely replaces natural aggregate to prepare concrete, so that the concrete has a good application prospect when being used for house buildings or road bases and the like.
The concrete performance is highly related to the aggregate performance, the inherent defects (more edges and corners, low apparent density, high water absorption and crushing index) of the technical performance of the recycled aggregate enable the recycled concrete to have the characteristics of poor workability, low strength, large dry shrinkage deformation, poor durability and the like, the recycled aggregate is rarely applied to medium-high strength concrete due to poor technical performance, and the reinforcement and improvement of the quality of the recycled aggregate is a necessary way for high-value resource utilization.
The chinese patents on recycled aggregate fortification that have been published at present mainly use two major mechanisms: particle shaping and slurry repair strengthening.
Chinese patents CN107572851A, CN106582999A, CN111574090B and CN106495516B all adopt mechanical equipment to carry out particle shaping on recycled aggregates, and the aggregate strengthening method can remove old cement mortar and aggregate particle edges and corners in the recycled aggregates. But has the following limitations: 1) Mutual collision among aggregates and grinding of mechanical equipment can aggravate the generation of micro-cracks of the recycled aggregates; 2) The aggregate strengthening method has no obvious effect on strengthening the recycled brick aggregate.
Chinese patents CN108863131B, CN112897918A, CN113800813A, CN110498629B, CN110668727B, CN111847949B, CN113651549A and CN113075100A are all used for filling, repairing and wrapping recycled aggregates by reinforced slurry. The aggregate strengthening method has the following disadvantages: 1) The recycled aggregate has more edges and corners, the shape of aggregate particles is not greatly improved by adopting reinforced slurry for repairing, and sharp edges and corners in the recycled aggregate can cause stress concentration in concrete; 2) Old cement mortar still exists in the recycled aggregate, and when the old cement mortar is stressed, the transition area of an old concrete interface is still easy to break; 3) The reinforcing component attached to the surface of the aggregate can influence the combination of the aggregate and a cement hydration product, and the strength of a transition area of a new concrete interface can be weakened to a certain extent.
The recycled aggregate is reinforced by considering not only the removal of old cement mortar and the shaping of the appearance of aggregate particles, but also the repair and filling of micro cracks and pores. None of the above patents can achieve this strengthening effect.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to improve the technical performance of the recycled aggregate, and provides a method for strengthening the recycled aggregate by a physical compound microorganism technology. The invention can effectively solve the inherent defects of more sharp edges and corners of the recycled aggregate, low apparent density, high water absorption rate and crushing index and the like, further improve the problems of poor workability, low strength, poor durability and the like of the recycled concrete, is favorable for improving the resource utilization rate of demolished garbage, and has remarkable environmental and economic benefits.
The technical scheme of the invention is as follows:
s1: mixing the recycled aggregate with a proper amount of solid steel balls, pouring the mixture into a horizontal concrete mixer, stirring for a proper time, taking out the steel balls after stirring, and screening out recycled aggregate particles with the particle size of less than 4.75mm to obtain the mechanically ground recycled aggregate;
s2: and (3) placing the recycled aggregate obtained in the step (S1) in a container with a proper size, pouring a proper amount of prepared microbial liquid, and treating to obtain the recycled aggregate reinforced by the physical compound microbial technology.
In the S1, the aggregate mass is as follows: the mass of the steel ball is =1 and is 0.2-0.3, and the stirring time is 10-15 min.
And in the S1, separating the aggregate from the steel ball through magnetic separation equipment, and taking out the steel ball.
And in the step S2, the mechanically ground recycled aggregate and the microbial liquid are mixed and soaked for 4-6 hours, the recycled aggregate is stirred once every 1 hour, the bacterial liquid is fully absorbed into cracks or pores of the recycled aggregate, the cementing liquid is doped after soaking is completed, the mixture is uniformly stirred and kept stand, the recycled aggregate is stirred once every 1 day, and the recycled aggregate is fished out after 3-5 days and naturally aired to obtain the recycled aggregate after the physical composite microbial technology is enhanced.
The recycled aggregate is prepared by crushing and screening construction demolition waste, and comprises but is not limited to recycled concrete aggregate, recycled brick-concrete aggregate and recycled brick aggregate, and the particle size range of the mechanically-ground recycled aggregate is 4.75-31.5 mm.
The solid steel ball is produced in general industry, and the grain size is 19-25 mm.
The microbial liquid is Brucella oryzae 2-9, is preserved in China center for type culture Collection, and has a patent strain preservation number of CCTCC M2021810.
The plant name is: 2-9 parts of Brucella oryzae, 2-9 parts of Brucella species name and Brucella genus name
The preservation date is as follows: 2021.07.02
The preservation unit is as follows: china Center for Type Culture Collection (CCTCC)
The preservation number is as follows: CCTCC M2021810
Taxonomic Properties: (ii) Bacteria; proteobacteria; alphaproteobacteria; rhizobiales; brucellaceae; brucella.
The concentration OD of the microbial inoculum 600 1.0 to 1.5, and the addition volume is calculated according to the following formula:
V bacterial liquid ＝3(m×α)/ρ Bacterial liquid
Wherein, V Bacterial liquid Represents the volume of the added microbial solution, and the unit is L; m represents the mass of the recycled aggregate after mechanical grinding, and the unit is kg; alpha represents the saturated surface dry water absorption of the recycled aggregate, and the unit is percent; ρ is a unit of a gradient Bacterial liquid The density of the microbial liquid was approximately 1kg/L.
The liquid culture medium of the microbial liquid comprises 1.0g/L of ammonium sulfate, 2.0g/L of yeast extract and 1L of deionized water.
The Yeast extract is also called Yeast monosodium glutamate, is named Yeast extract in English, is obtained by breaking cell wall of Yeast, extracting protein, nucleic acid, vitamins, etc., and performing biological enzymolysis to obtain a substance rich in small molecular amino acids, peptides, nucleotides, vitamins, etc. Wherein the amino acid content is more than 30%, the total protein content is more than 50%, and the nucleotide content is more than 10%.
The cementing liquid is urea and CaCl 2 Mixing the solutions, wherein the molar concentration ratio is 1:1, namely the concentrations of the two are the same, the total solute concentration is 1.6-2.4 mol/L, and the volume of the cementing liquid is 4 times of that of the microbial liquid.
The method firstly removes old cement mortar and sharp edges and corners in the aggregate through mechanical grinding, improves the firmness and particle morphology of the aggregate, then utilizes microorganisms to induce carbonate precipitation repair and fill micro cracks and pores of the aggregate, improves the surface characteristics of the aggregate, improves the surface activity of the aggregate, and greatly strengthens the performance of the recycled aggregate. Under the synergistic action of physics, biology and physics and biology, the invention obviously improves the technical performance of the recycled aggregate, which is shown in that the apparent density is improved (more than 5%), the water absorption is reduced (more than 28%), the crushing index is reduced (more than 30%), the particle morphology is optimized, and when the calcium carbonate particles precipitated on the surface of the aggregate are used in concrete, the calcium carbonate particles can stimulate the hydration of cement, promote the combination of the aggregate and hydration products, and improve the strength of the concrete.
The principle of the invention is as follows:
firstly, mechanically grinding the recycled aggregate by using a physical method and a horizontal concrete mixer, effectively removing old cement mortar attached in the recycled aggregate, removing sharp edges and corners on the surface of the aggregate, improving the firmness of aggregate particles and optimizing the shape of the aggregate particles;
the ground aggregate surface is treated by utilizing the microbial technology, micro cracks on the aggregate surface are effectively repaired and open pores are filled by calcium carbonate generated by microbial induction, and calcium carbonate particles have the function of exciting hydration of a cement-based material, so that the surface activity of the aggregate is improved, and when the calcium carbonate is used in concrete, the strength of the concrete can be further improved; in addition, the fine powder produced by mechanical grinding contains a certain amount of Silica (SiO) 2 ) Aluminum oxide (Al) 2 O 3 ) Active substances such as calcium oxide (CaO) enter the micro-cracks and pores of the aggregate and can be used in the field of microbial technologyThe physical stage is excited to generate rock minerals such as tobermorite (C-S-H) and the like, and further play a role in filling micro cracks and pores. Therefore, the performance of the recycled aggregate is remarkably improved under the physical, biological and physical-biological synergistic action.
The invention has the beneficial effects that:
1. under the physical, biological and physical and biological synergistic effects, the invention obviously improves the technical performance of the recycled aggregate, and shows that the apparent density is improved (more than 5%), the water absorption is reduced (more than 28%), the crushing index is reduced (more than 30%), the particle morphology is optimized, the characteristics of poor workability, low strength, poor durability and the like of the recycled concrete can be effectively solved, and the invention is favorable for popularization and application of the recycled concrete in engineering construction.
2. The invention improves the surface activity of the recycled aggregate, when the recycled aggregate is used in concrete, the calcium carbonate particles precipitated on the surface can stimulate the hydration of cement, promote the combination of the aggregate and hydration products, and also can play a role in improving the strength of the concrete and the durability.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments, which will assist those skilled in the art in further understanding the present invention, but do not limit the present invention in any way.
The first embodiment is as follows:
the raw materials and properties were as follows:
recycled concrete aggregate: from a certain building demolition project, the recycled concrete aggregate is obtained by crushing and screening waste concrete, has the particle size range of 4.75-31.5 mm, and is called as recycled concrete aggregate. According to the construction macadam and pebble (GB/T14685-2011), the apparent density of the recycled concrete aggregate is 2617kg/m 3 The crush index was 10.1%, and the water absorption was 4.73%.
Steel ball: a solid steel ball with the diameter of 19mm is adopted, and the material is carbon steel Q235.
Brucella: purified and separated humus soil excavated from refuse landfills and preserved in China center for type culture Collection, and the preservation number of patent strains is CCTCC No:2021810.
the method comprises the following specific implementation steps:
1. preparation of brucella bacterial liquid and cementing liquid
Inoculating Brucella mother bacteria liquid into culture medium (the culture medium comprises ammonium sulfate 1.0g/L, yeast extract 2.0g/L, and deionized water 1L.), and culturing in constant temperature shaking table at 30 deg.C and 200rpm until the OD 600 of bacteria liquid is about 1.0; preparing mixed solution of urea and calcium chloride, wherein the concentration of the urea and the calcium chloride is 0.8mol/L.
2. Aggregate reinforcement
S1: weighing 10kg of recycled concrete aggregate, mixing the recycled concrete aggregate with about 3kg of solid steel balls, pouring the mixture into a horizontal concrete mixer to mix for 15min, after the mixing is finished, picking out the steel balls, and screening out recycled concrete aggregate particles with the particle size of less than 4.75mm to obtain about 8.8kg of mechanically-ground recycled concrete aggregate;
and S2, placing the recycled concrete aggregate obtained in the S1 in a container with a proper size, pouring 1.3L of prepared microbial liquid, mixing and soaking the aggregate and the microbial liquid for 6 hours, turning the aggregate once every 1 hour to ensure that the microbial liquid is fully absorbed into cracks or pores of the aggregate, adding 5.2L of cementing liquid after soaking is finished, uniformly stirring, standing, turning the aggregate once every 1 day, taking out after 3 days, and naturally airing to obtain the recycled concrete aggregate reinforced by the mechanical grinding composite microbial technology.
3. Testing of technical Properties of aggregate
The apparent density, water absorption and crushing index parameters of the reinforced recycled concrete aggregate are tested according to the construction macadam and pebble (GB/T14685-2011), and the results are shown in Table 1.
The second embodiment:
the raw materials and properties were as follows:
recycled brick-concrete aggregate: the recycled brick-concrete aggregate is obtained from certain building demolition engineering by crushing and screening waste concrete and waste bricks, has the brick content of about 24.7 percent and the particle size range of 4.75-31.5 mm, and is called recycled brick-concrete aggregate. According to "crushed stones and pebbles for construction" (GB/T14685-2011), the apparent density of the recycled brick-concrete aggregate is 2406kg/m 3 The crush index was 23.3%, and the water absorption was 9.14%.
Steel ball: a solid steel ball with the diameter of 19mm is adopted, and the material is carbon steel Q235.
Brucella: purifying and separating humus soil excavated from a refuse landfill, preserving the humus soil in China center for type culture Collection, wherein the preservation number of patent strains is CCTCC No:2021810.
the method comprises the following specific implementation steps:
1. preparation of brucella bacterial liquid and cementing liquid
Inoculating Brucella mother bacteria liquid into culture medium (the culture medium comprises ammonium sulfate 1.0g/L, yeast extract 2.0g/L, and deionized water 1L.), and culturing in constant temperature shaking table at 30 deg.C and 200rpm until the OD 600 of bacteria liquid is about 1.2; preparing urea-calcium chloride mixed solution, wherein the concentration of the urea and the calcium chloride is 1mol/L.
2. Aggregate strengthening
S1: weighing 10kg of recycled brick-concrete aggregate, mixing the recycled brick-concrete aggregate with about 3kg of solid steel balls, pouring the mixture into a horizontal concrete mixer, stirring for 12min, picking out the steel balls after stirring, and screening out recycled aggregate particles with the particle size of less than 4.75mm to obtain about 7.1kg of mechanically ground recycled brick-concrete aggregate;
and S2, placing the recycled brick mixed aggregate obtained in the S1 into a container with a proper size, pouring 2.0L of prepared microbial liquid, mixing and soaking the aggregate and the bacterial liquid for 5 hours, turning the aggregate once every 1 hour, fully absorbing the bacterial liquid into cracks or pores of the aggregate, doping 8.0L of cementing liquid after soaking, uniformly stirring, standing, turning the aggregate once every 1 day, taking out after 4 days, and naturally airing to obtain the recycled brick mixed aggregate reinforced by the mechanical grinding composite microbial technology.
3. Testing of technical Properties of aggregates
The apparent density, water absorption and crushing index parameters of the reinforced recycled brick-concrete aggregate are tested according to the construction macadam and pebble (GB/T14685-2011), and the results are shown in Table 1.
Example three:
the raw materials and properties are as follows:
recycled brick aggregate: from a building demolition project, is obtained by crushing and screening waste bricksThe recycled brick aggregate is called as the recycled brick aggregate, and the particle size range of the recycled brick aggregate is 4.75-31.5 mm. According to the construction crushed stones and pebbles (GB/T14685-2011), the apparent density of the recycled brick aggregate is 2344kg/m 3 The crush index was 36.4%, and the water absorption was 15.82%.
Steel ball: a solid steel ball with the diameter of 19mm is adopted, and the material is carbon steel Q235.
Brucella: purifying and separating humus soil excavated from a refuse landfill, preserving the humus soil in China center for type culture Collection, wherein the preservation number of patent strains is CCTCC No:2021810.
the method comprises the following specific implementation steps:
1. preparation of brucella bacterial liquid and cementing liquid
Inoculating Brucella mother bacteria liquid into a culture medium (the culture medium comprises 1.0g/L of ammonium sulfate, 2.0g/L of yeast extract and 1L of deionized water), and culturing in a constant temperature shaking table at 30 ℃ and 200rpm until the OD 600 of the bacteria liquid is 1.5; preparing mixed solution of urea and calcium chloride, wherein the concentration of the urea and the calcium chloride is 1.2mol/L.
2. Aggregate reinforcement
S1: weighing 10kg of recycled brick aggregate, mixing the recycled brick aggregate with about 3kg of solid steel balls, pouring the mixture into a horizontal concrete mixer to be mixed for 10min, after the mixing is finished, picking out the steel balls, and screening out recycled brick aggregate particles with the particle size of less than 4.75mm to obtain about 7.6kg of mechanically ground recycled brick aggregate;
and S2, placing the recycled aggregate obtained in the S1 into a container with a proper size, pouring 2.9L of prepared microbial liquid, mixing and soaking the aggregate and the microbial liquid for 4 hours, turning the aggregate once every 1 hour to ensure that the microbial liquid is fully absorbed into cracks or pores of the aggregate, adding 11.6L of cementing liquid after soaking is finished, stirring uniformly, standing, turning the aggregate once every 1 day, taking out after 5 days, and naturally airing to obtain the recycled brick aggregate reinforced by the mechanical grinding composite microbial technology.
3. Testing of technical Properties of aggregates
The apparent density, water absorption and crushing index parameters of the reinforced recycled brick aggregate are tested according to the construction macadam and pebble (GB/T14685-2011), and the results are shown in Table 1.
TABLE 1 comparison of technical Performance indexes before and after Reinforcement of recycled aggregates
As can be seen from table 1, the technical performance of the recycled aggregate in examples one, two and three is significantly improved after the reinforcement of the present invention.
In order to further verify the practicability of the invention, the recycled aggregate before and after reinforcement in the first, second and third examples is used for preparing concrete, the material dosage is calculated according to the design rule of common concrete mix proportion (JGJ 55-2011), the design strength is 30MPa, and the material mix proportion is shown in Table 2. Because the saturated water absorption of various aggregates has larger difference, in order to avoid the influence of the water absorption of the aggregates on the water-cement ratio and further on the gelation performance, the additional water is calculated by taking the aggregate to reach a saturated surface dry state. The concrete basic performance test results are shown in table 3.
TABLE 2 concrete mix proportions
TABLE 3 basic Properties of the concrete
As can be seen from the data in Table 3, the invention has different degrees of improvement on slump, apparent density and 28-day compressive strength of the recycled concrete, the maximum improvement effect on the 28-day compressive strength of the concrete can reach 39.7 percent, the mechanical property of the concrete is obviously improved, and the practicability of the invention is further verified.
The above examples are merely the results of the present invention on this example, but the specific implementation of the present invention is not limited to this example. Any alternatives which have similar effects according to the principles and concepts of the invention should be considered as the protection scope of the invention.
Claims (10)
1. A method for strengthening recycled aggregate by physical compound microbiological technology is characterized in that: the method comprises the following steps:
s1: mixing the recycled aggregate with the solid steel balls, pouring the mixture into a horizontal concrete mixer, stirring for a proper time, taking out the steel balls after stirring, and screening out recycled aggregate particles with the particle size of less than 4.75mm to obtain the mechanically ground recycled aggregate;
s2: and (3) placing the recycled aggregate obtained in the step (S1) in a container, pouring the prepared microbial liquid, and treating to obtain the recycled aggregate reinforced by the physical compound microbial technology.
2. The method for strengthening recycled aggregate by physical compound microorganism technology as claimed in claim 1, wherein the method comprises the following steps:
in the S1, the aggregate mass is as follows: the mass of the steel ball is =1 and is 0.2-0.3, and the stirring time is 10-15 min.
3. The method for strengthening recycled aggregate by physical compound microbiological technology as claimed in claim 1, wherein: and in the S1, separating the aggregate from the steel ball through magnetic separation equipment, and taking out the steel ball.
4. The method for strengthening recycled aggregate by physical compound microbiological technology as claimed in claim 1, wherein: in the S2, the mechanically ground recycled aggregate and the microbial bacteria liquid are mixed and soaked for 4-6 hours, the recycled aggregate is turned once every 1 hour, the bacteria liquid is fully absorbed into cracks or pores of the recycled aggregate, the cementing liquid is doped after soaking is completed, the mixture is uniformly stirred and kept stand, the recycled aggregate is turned once every 1 day, and the mixture is fished out after 3-5 days and naturally aired to obtain the recycled aggregate after the physical compound microbial technology is strengthened.
5. The method for strengthening recycled aggregate by physical compound microbiological technology as claimed in claim 1, wherein: the recycled aggregate is prepared by crushing and screening construction demolition garbage.
6. The method for strengthening recycled aggregate by physical compound microorganism technology as claimed in claim 1, wherein the method comprises the following steps: the solid steel ball has a particle size of 19-25 mm.
7. The method for strengthening recycled aggregate by physical compound microorganism technology as claimed in claim 1, wherein the method comprises the following steps: the microbial liquid is Brucella oryzae 2-9, and is preserved in China center for type culture Collection, and the preservation number of the patent strain is CCTCC M2021810.
8. The method for strengthening recycled aggregate by physical compound microbiological technology as claimed in claim 1, wherein: the concentration OD of the microbial inoculum 600 1.0 to 1.5, and the addition volume is calculated according to the following formula:
V bacterial liquid ＝3(m×α)/ρ Bacterial liquid
Wherein, V Bacterial liquid Represents the volume of added microbial fluid; m represents the mass of the recycled aggregate after mechanical grinding; α represents the saturated surface dry water absorption of the recycled aggregate; rho Bacterial liquid Indicates the density of the microbial liquid.
9. The method for strengthening recycled aggregate by physical compound microbiological technology as claimed in claim 1, wherein: the liquid culture medium of the microbial liquid comprises 1.0g/L of ammonium sulfate, 2.0g/L of yeast extract and 1L of deionized water.
10. The method for strengthening recycled aggregate by physical compound microorganism technology as claimed in claim 1, wherein the method comprises the following steps: the cementing liquid is urea and CaCl 2 Mixing the solutions, wherein the molar concentration ratio is 1:1, the total solute concentration is 1.6 mol/L-2.4 mol/LThe volume of the cementing liquid is 4 times of that of the microbial liquid.
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| CN113651549A (en) * | 2021-09-18 | 2021-11-16 | 中山大学 | Recycled concrete aggregate reinforced by construction waste micro powder and preparation method thereof |
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2022
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| CN113651549A (en) * | 2021-09-18 | 2021-11-16 | 中山大学 | Recycled concrete aggregate reinforced by construction waste micro powder and preparation method thereof |
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