CN110615629A - Preparation method of concrete recycled aggregate based on microbial mineralization technology - Google Patents
Preparation method of concrete recycled aggregate based on microbial mineralization technology Download PDFInfo
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- CN110615629A CN110615629A CN201910998997.7A CN201910998997A CN110615629A CN 110615629 A CN110615629 A CN 110615629A CN 201910998997 A CN201910998997 A CN 201910998997A CN 110615629 A CN110615629 A CN 110615629A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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 preparing high-quality recycled aggregate from waste concrete based on a microbial mineralization technology, which comprises the following steps: preparing colloidal spore bacteria powder as a microbial additive; taking a fine particle material with the particle size range of 2.36-4.75 mm after impurity removal and crushing as an inner core material, uniformly stirring fine powder material with the particle size range of less than 2.36mm, a microbial additive and cement to serve as wrapping powder material, placing the inner core material in a sugar coating machine, wrapping balls and pelletizing in a mode of adding the wrapping powder material while spraying and adding water, and maintaining in an environment with the relative humidity of 95 +/-5% and the temperature of 20 +/-5 ℃ after pelletizing; maintaining for 1 day, sieving to obtain granules with particle diameter of more than 5mm, and placing in CO under certain conditions2And curing for 4-6 h in a carbonization box, taking out and curing for 7 days under atmospheric conditions to obtain a regenerated aggregate finished product. The method for preparing the recycled aggregate by efficiently utilizing the waste concrete has the advantages of high waste utilization rate, resource saving and higher economic and social effectsIt is beneficial to.
Description
Technical Field
The invention belongs to the field of microbial building materials, and particularly relates to a preparation method of a high-quality concrete recycled aggregate based on a microbial mineralization technology by taking solid waste concrete as a main raw material.
Background
Concrete is the most widely used building material with the largest consumption at present and even in future, and natural aggregate resources which can be used for concrete are in increasing shortage with the increasing of natural sandstone resource limit and environmental protection. With the acceleration of urbanization process, waste concrete brought by the demolition and reconstruction of a large number of old buildings needs to be treated urgently. The waste concrete is used as concrete aggregate after being treated by the steps of separation, crushing, screening, preparation, reinforcement and the like, namely the recycled aggregate, and the resource utilization of the waste concrete can be realized. Generally, microcracks are easily generated in the crushing and preparation processes, and a large amount of old mortar and set cement are attached to the surface of the regenerated aggregate, so that the characteristics of large water absorption rate, poor firmness and low crushing index of the regenerated aggregate are caused, the performance of the prepared regenerated mortar and regenerated concrete is seriously influenced, and the wide application of the regenerated aggregate is limited. In addition, the fine powder generated in the process is more and is difficult to be fully applied, and the resource utilization efficiency of the waste concrete is influenced. How to effectively realize the recycling of the waste concrete and prepare the high-quality artificial aggregate becomes a research hotspot in the field of current waste resource utilization.
The microbial mineralization technology is to provide optimal growth, propagation and enzymatic reaction conditions for certain microbes extracted from nature and then to increase the required CO2In such a concentration that the carbonic anhydrase secreted thereby accelerates CO2Thereby carrying out mineralization reaction with the oxide containing alkaline or alkaline earth metal to generate stable carbonate with certain gelling property. And the secretion of the microorganisms also has certain gelling property, so that the high-efficiency carbon fixation of the microorganisms is realized. The technology is an advanced technology which can utilize waste, save resources and energy, relieves the pollution problem caused by industrial discharge to a certain extent, and has higher economic and social benefits.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects that the performance of the recycled aggregate prepared in the prior art is poor and the waste concrete fine powder cannot be utilized, the invention provides a preparation method of the concrete recycled aggregate based on a microbial mineralization technology.
The technical scheme is as follows: the invention relates to a preparation method of concrete recycled aggregate based on a microbial mineralization technology, which comprises the following steps:
(1) the cell concentration was adjusted to 106～107Preparing bacterial powder from the concentrated colloidal spore bacterial liquid per mL by using spray drying equipment, and using the bacterial powder as a microbial additive;
(2) taking waste concrete particles and fine powder which are subjected to impurity removal and crushing and have the particle size of less than 4.75mm, and screening to obtain fine particle alpha materials with the particle size range of 2.36-4.75 mm and fine powder beta materials with the particle size of less than 2.36 mm;
(3) taking the alpha material in the step (2) as an inner core material, taking cement, the beta material in the step (2) and the microbial additive in the step (1), stirring and mixing uniformly to obtain a powder wrapping material, placing the inner core material in a sugar coating machine, and wrapping, balling and granulating in a manner of adding the powder wrapping material while spraying and adding water;
(4) after balling, maintaining in an environment with the relative humidity of 95 +/-5% and the temperature of 20 +/-5 ℃, taking out after 1-3 days, screening to obtain particles with the particle size of more than 5mm, carrying out next treatment, and continuously wrapping the remaining particles with the particle size of less than 5mm until the particle size is more than 5 mm;
(5) placing the granules larger than 5mm after sieving in CO2And curing for 4-6 h in a carbonization box, taking out, and curing for 7-14 days under the atmospheric condition to obtain the final finished product regenerated aggregate.
In the step (1), the preparation process of the concentrated colloidal spore bacterial liquid comprises the following steps: inoculating bacillus mucilaginosus to a sterilized culture medium (each liter of the culture medium contains 2-7 g of peptone, 4-6 g of beef extract, 4-7 g of NaCl, 12-16 g of agar and MgSO (MgSO) respectively40.4-0.7 g, controlling the pH value to be 7-8, performing shake culture at 30 +/-5 ℃ for 24h) to obtain a bacillus mucilaginosus-containing bacterial solution, centrifuging at the temperature of 5 ℃ at 4000-6000 rpm for 15-20 min at a high speed, removing nutrient substances of an upper layer culture medium, adding deionized water, and concentrating the bacterial solution to obtain the bacterial solution with the bacterial concentration of 106～107The product is obtained after being treated per mL.
In the step (3), the mass ratio of the inner core material to the wrapping powder material is 1: 2-3.33, wherein the mass ratio of beta materials, cement and microbial additives in the powder wrapping material is 1: 0.1-0.4: 0.02-0.05, and the water mixing amount is prepared in a spraying mode of not more than 30% of the total mass of the inner core material and the wrapping powder, and preferably is 20-30% of the total mass of the inner core material and the wrapping powder.
Further preferably, the mass ratio of the beta material, the cement and the microbial additive in the powder coating material is 1: 0.1-0.4: 0.03 to 0.04.
In the step (3), the cement is quick-setting and quick-hardening cement, and the water mixing amount is regulated and controlled according to the actual condition of the waste concrete.
In the step (3), the operations of wrapping the ball, pelletizing and granulating are as follows: putting the core material into a sugar-coating machine, spraying 2-5 times of water on the surface after rotation, adding the proportional coating powder into the sugar-coating machine uniformly and repeatedly after the surface is wetted, and coating, balling and granulating by adding the once coated powder and spraying 1-2 times of water.
In the step (4), the curing conditions in the carbonization box are as follows: 70 +/-5% RH, 0.1-0.2 MPa CO2And (4) pressure.
The prepared regenerated aggregate finished product is prepared by wrapping the inner core material with the wrapping powder to prepare the regenerated aggregate with the core-shell structure.
In the invention, under the condition of certain carbon dioxide pressure maintenance, the bacillus mucilaginosus powder uses a microbial additive as a powder coating material, and CaCO is formed under the action of microbial mineralization in the environment of concrete waste particles and a cement alkaline system3And the cement used as the binder generates hydration products through hydration, the performance of the regenerated aggregate is obviously improved, and the effect is better when the mixing amount is more in the range of the mixture ratio.
The regenerated aggregate finished product is detected, the water absorption rate is 5.5-10%, and the apparent density is 2250-2600 kg/m3The bulk density is 1200-1550 kg/m3The crushing index is 10-25%, and the microbial additive in the wrapping powder is in a mass ratio of 0.02-0.05, the water absorption rate is gradually reduced and the bulk density is gradually increased along with the increase of the doping amount. Microbial mineralization accelerates CO due to incorporation of microbial additives2Conversion to carbonate, binding Ca2+Calcium carbonate deposition is formed, so that the particles become more compact and have higher strength, the water absorption is reduced, and the aggregate bulk density is improved.
Has the advantages that: compared with the prior art, the preparation method of the recycled aggregate has the following advantages:
(1) the prepared finished regenerated aggregate has a single-particle structure form as shown in figure 2, and the method makes full use of waste concrete particles with the particle size of less than 4.75mm, overcomes the defects of low utilization rate and difficult efficient utilization of fine powder, and prepares the regenerated aggregate with low water absorption and high strength.
(2) During wet curing and carbonization of the microbial additive added into the powder wrapping material, carbonic anhydrase generated by the bacillus mucilaginosus in the growth and reproduction process can promote CO2Absorbing and converting the generated carbonate and Ca in the alkaline system environment2+CaCO with cementitious properties3Thereby improving the compactness of the aggregate particles, reducing the water absorption and strengthening the strength of the regenerated aggregate particles.
(3) The preparation method realizes the preparation of the recycled aggregate of the core-shell structure particles, strengthens the performance of the recycled aggregate by a microbial mineralization technology, and efficiently utilizes the waste concrete. The method has the advantages of strong applicability, high waste utilization rate, obvious effect, environmental friendliness, great significance for recycling solid waste resources and sustainable development, convenience for implementation and popularization and wide application prospect.
Drawings
FIG. 1 is a diagram showing the appearance and appearance of the recycled aggregate prepared by the method of the present invention;
FIG. 2 shows a schematic diagram of the core-shell structure of the recycled aggregate particles prepared by the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The bacillus mucilaginosus adopted by the invention is all from China center for preservation of industrial microorganism strains
The invention relates to a method for preparing concrete recycled aggregate based on microbial mineralization technology, which comprises the following steps:
(1) obtaining a microbial additive: inoculating bacillus mucilaginosus to a sterilized culture medium, wherein each liter of the culture medium contains 2-7 g of peptone, 4-6 g of beef extract, 4-7 g of NaCl, 12-16 g of agar and MgSO (MgSO) water40.4-0.7 g, controlling the pH value to be 7-8, performing shake culture at 30 +/-5 ℃ for 24h to obtain a bacillus mucilaginosus-containing bacterial solution, centrifuging at the temperature of 5 ℃ at 4000-6000 rpm for 15-20 min at a high speed, removing nutrient substances of an upper layer culture medium, adding deionized water, and concentrating the bacterial solution to obtain a bacterial solution with the thallus concentration of 106～107Per mL; then the bacterial liquid is prepared into powder, namely glue, by a QFN-8000S spray dryerBacillus mucilaginosus powder;
(2) taking waste concrete particles and fine powder with the particle size of less than 4.75mm after impurity removal and crushing, and screening into fine alpha materials with the particle size range of 2.36-4.75 mm and fine beta materials with the particle size of less than 2.36 mm;
(3) taking the alpha material as an inner core material for standby; mixing beta material, cement and microbial additive according to the mass ratio of 1: 0.1-0.4: 0.02-0.05, and uniformly stirring to obtain a powder coating material for later use;
(4) putting the core material M g into a sugar-coating machine, spraying 2-5 times of water on the surface after rotation, adding the coated powder with the mass ratio of 2-3.33M g into the sugar-coating machine uniformly in several times after the surface is wetted, and coating, balling and granulating according to the steps of adding the coated powder once and spraying 1-2 times of water;
(5) after balling, the regenerated aggregate is taken out and placed in a constant temperature and humidity curing box with relative humidity (95 +/-5 percent) and temperature (20 +/-5 ℃) for environmental curing, and the regenerated aggregate is taken out and screened after 1 day of curing. Carrying out next treatment on the regenerated aggregate with the particle size of more than 5mm, putting the regenerated aggregate with the particle size of less than 5mm in the sugar-coating machine again, and continuing to wrap the balls until the particle size meets the requirement;
(6) placing the sieved granules larger than 5mm in CO with relative humidity (70 +/-5%)2In a carbonization chamber, in a certain amount of CO2And curing for 4-6 h under pressure, taking out, and curing for 7 days under the atmospheric condition to obtain the final finished product regenerated aggregate.
Example 1
One of the mixture ratios is selected for preparing the regenerated aggregate, and the steps and the product effects are as follows:
the proportion of the core material to the wrapping powder material is 1:2.5, the wrapping powder material is prepared from beta material, cement and microbial additive in a proportion of 1:0.25:0.03, and the water spraying amount is 25% of the total mass of the core and the wrapping powder material. The method comprises the following specific steps:
TABLE 1 regenerated aggregate waste concrete system ratio/(g)
(1) Obtaining a microbial additive: inoculating Bacillus mucilaginosus into the sterilized culture medium solution to obtain the product containing gelatinCentrifuging at 5 deg.C for 15min at 5000rpm, removing nutrient substances in upper layer culture medium, adding deionized water, and concentrating to obtain concentrated solution containing thallus with concentration of 106～107one/mL. The bacterial powder is prepared by a spray dryer of fermentation QFN-8000S.
(2) Taking waste concrete particles and fine powder with the particle size of less than 4.75mm after impurity removal and crushing, and screening into fine particle alpha materials with the particle size range of 2.36-4.75 mm and fine powder beta materials with the particle size of less than 2.36 mm;
(3) taking alpha as an inner core material for standby; 977g of beta material, 244g of sulphoaluminate cement and 29g of microbial additive are mixed and uniformly stirred to be used as a powder wrapping material for standby;
(4) putting 500g of core material into a sugar-coating machine, spraying 3 times of water on the surface after rotation, adding 1250g of powder wrapping material into the sugar-coating machine in 5 times of uniform distribution after the surface is wetted, and spraying one time of water for one time according to the added powder wrapping material for wrapping, balling and granulating, wherein the total water consumption is 437.5 g;
(5) after balling, the regenerated aggregate is taken out and placed in a constant temperature and humidity curing box with relative humidity (95 +/-5 percent) and temperature (20 +/-5 ℃) for environmental curing, and the regenerated aggregate is taken out and screened after 1 day of curing. Placing the sieved granules with a particle size of more than 5mm in a chamber with a relative humidity of (70 + -5%) CO2In a carbonization chamber, in a certain amount of CO2Curing for 4-6 h under pressure, taking out and curing for 7 days under atmospheric conditions (20 +/-10 ℃, 60 +/-10% RH), thus obtaining the final finished product recycled aggregate. And putting the particles with the particle size of less than 5mm into the sugar coating machine again, and continuously wrapping the balls until the particle size meets the requirement.
The regenerated aggregate is analyzed according to GB/T25177-2010, the particle size range is 5-15 mm, the water absorption is 9.5%, and the apparent density is 2340kg/m3Bulk density 1280kg/m3The crush index was 18.5%. Due to the mineralization of microorganisms, a large amount of calcium carbonate is generated on the surface layer of the carbonized regenerated aggregate, so that the density of the particles is increased.
Example 2
The preparation method of the embodiment is the same as that of the embodiment 1, except that the using amount of the wrapping powder is increased, and the proportion of the cement and the microorganism modifier is relatively increased, which is shown as follows:
the proportion of the core material to the wrapping powder material is 1:3.33, the wrapping powder material is prepared from beta material, cement and microbial additive in a proportion of 1:0.35:0.04, and the water spraying amount is 25% of the total mass of the core material and the wrapping powder material.
TABLE 2 regenerated aggregate waste concrete system ratio/(g)
The regenerated aggregate is analyzed according to GB/T25177-2010, the particle size range is 5-15 mm, the water absorption is 6.8%, and the apparent density is 2430kg/m3Bulk density 1350kg/m3The crush index was 15.5%. Due to the mineralization of microorganisms, a large amount of calcium carbonate is generated on the surface layer of the carbonized regenerated aggregate, so that the density of the particles is increased.
Example 3
The preparation method of the embodiment is the same as that of the embodiment 1, except that the using amount of the wrapping powder is reduced, and the proportion of the cement and the microorganism modifier is relatively increased, which is shown as follows:
the proportion of the core material to the wrapping powder material is 1:2, the wrapping powder material is prepared from beta material, cement and microbial additive in a proportion of 1:0.15:0.03, and the water spraying amount is 25% of the total mass of the core material and the wrapping powder material.
TABLE 3 regenerated aggregate waste concrete system ratio/(g)
The appearance of the regenerated aggregate is shown in figure 1, the schematic diagram of the core-shell structure is shown in figure 2, and the regenerated aggregate is analyzed according to GB/T25177-2010, wherein the particle size range is 5-15 mm, the water absorption rate is 11.8%, and the apparent density is 2300kg/m3Bulk density 1150kg/m3The crush index was 19.8%. Due to the mineralization of microorganisms, a large amount of calcium carbonate is generated on the surface layer of the carbonized regenerated aggregate, and the density of particles is increased.
Claims (8)
1. A preparation method of concrete recycled aggregate based on a microbial mineralization technology is characterized by comprising the following steps:
(1) the cell concentration was adjusted to 106～107Preparing bacterial powder from the concentrated colloidal spore bacterial liquid per mL by using spray drying equipment, and using the bacterial powder as a microbial additive;
(2) taking waste concrete particles and fine powder which are subjected to impurity removal and crushing and have the particle size of less than 4.75mm, and screening to obtain fine particle alpha materials with the particle size range of 2.36-4.75 mm and fine powder beta materials with the particle size of less than 2.36 mm;
(3) taking the alpha material in the step (2) as an inner core material, taking cement, the beta material in the step (2) and the microbial additive in the step (1), stirring and mixing uniformly to obtain a powder wrapping material, placing the inner core material in a sugar coating machine, and wrapping, balling and granulating in a manner of adding the powder wrapping material while spraying and adding water;
(4) after balling, maintaining in an environment with the relative humidity of 95 +/-5% and the temperature of 20 +/-5 ℃, taking out after 1-3 days, screening to obtain particles with the particle size of more than 5mm, carrying out next treatment, and continuously wrapping the remaining particles with the particle size of less than 5mm until the particle size is more than 5 mm;
(5) placing the granules larger than 5mm after sieving in CO2And curing for 4-6 h in a carbonization box, and then taking out and curing for 7-14 days under the atmospheric condition to obtain the final finished product regenerated aggregate.
2. The method for preparing concrete recycled aggregate according to claim 1, wherein in the step (1), the preparation process of the concentrated colloidal spore bacterial liquid comprises the following steps: inoculating bacillus mucilaginosus to the sterilized culture medium solution to obtain a bacterial solution containing the bacillus mucilaginosus, centrifuging at the high speed of 4000-6000 rpm for 15-20 min at the temperature of 5 ℃, removing nutrient substances of an upper layer culture medium, adding deionized water, and concentrating the concentration of thallus contained in the bacterial solution to be 106～107The product is obtained after being treated per mL.
3. The method for preparing the concrete recycled aggregate according to the claim 1, wherein in the step (3), the mass ratio of the core material to the coating powder material is 1:2 to 3.33.
4. The method for preparing the concrete recycled aggregate according to claim 1, wherein in the step (3), the mass ratio of the beta material to the cement to the microbial additive in the powder coating material is 1: 0.1-0.4: 0.02-0.05, and the water mixing amount is prepared in a spraying mode of not more than 30% of the total mass of the inner core material and the wrapping powder material.
5. The method for preparing concrete recycled aggregate according to claim 1, wherein in the step (3), the cement is quick-setting and quick-hardening cement, and the water content is regulated and controlled according to the actual condition of the waste concrete.
6. The method for preparing concrete recycled aggregate according to claim 1, wherein in the step (3), the operations of wrapping balls and pelletizing specifically comprise: putting the core material into a sugar-coating machine, spraying 2-5 times of water on the surface after rotation, adding the proportional coating powder into the sugar-coating machine uniformly and repeatedly after the surface is wetted, and coating, balling and granulating by adding the once coated powder and spraying 1-2 times of water.
7. The method for preparing concrete recycled aggregate according to claim 1, wherein in the step (4), the curing conditions in the carbonization chamber are as follows: relative humidity of 70 +/-5%, 0.1-0.2 MPa CO2And (4) pressure.
8. The method for preparing the concrete recycled aggregate according to claim 1, wherein the prepared recycled aggregate finished product is prepared by wrapping a core material with a powder wrapping material to prepare the recycled aggregate with a core-shell structure.
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| CN111943543A (en) * | 2020-07-21 | 2020-11-17 | 东南大学 | Method for preparing admixture by modifying steel slag powder through microbial technology |
| CN115028391A (en) * | 2022-03-31 | 2022-09-09 | 江苏科技大学 | Preparation method of curing agent for activating and utilizing recycled concrete micro powder |
| CN116283019A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Preparation method of waste aggregate of microorganism synergistic mineralization enhancer mixing station |
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| CN116283019A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Preparation method of waste aggregate of microorganism synergistic mineralization enhancer mixing station |
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