CN110482928B - Self-repairing concrete with recycled fine aggregate as carrier and preparation method thereof - Google Patents
Self-repairing concrete with recycled fine aggregate as carrier and preparation method thereof Download PDFInfo
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- CN110482928B CN110482928B CN201910693055.8A CN201910693055A CN110482928B CN 110482928 B CN110482928 B CN 110482928B CN 201910693055 A CN201910693055 A CN 201910693055A CN 110482928 B CN110482928 B CN 110482928B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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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 self-repairing concrete with recycled fine aggregate as a carrier and a preparation method thereof, wherein the self-repairing concrete comprises concrete ingredients and self-repairing recycled fine aggregate, and the self-repairing recycled fine aggregate accounts for 5-25% of the self-repairing concrete in percentage by volume; the self-repairing recycled fine aggregate is prepared by impregnating a bacillus pasteurianus bacterial liquid with the recycled fine aggregate; the OD value of the pasteurella bacillus liquid is 1.2-1.8, and the volume mixing amount of the pasteurella bacillus liquid is 25% by taking cement in concrete as a calculation reference. The invention adopts the recycled fine aggregate carrier, solves the problems of low carrier mechanical strength, poor microbial activity retention and inconvenient operation when other carriers are adopted in the past, and also has the good effect of recycling construction waste and self-repairing microbial concrete structure performance.
Description
Technical Field
The invention belongs to the technical field of special building materials, and particularly relates to self-repairing concrete taking recycled fine aggregate as a carrier and a preparation method thereof.
Background
With the continuous acceleration of urbanization scale in China and the rapid promotion of the construction of new socialist rural areas, the demolition of a large number of old buildings will generate a great deal of waste such as concrete, bricks, tiles and the like. According to the statistics of the Ministry of construction, by 2020, China will newly build 300 hundred million square meters of houses, and the quantity of the generated construction waste reaches 50 hundred million tons. Meanwhile, the concrete industry in China consumes about 150 hundred million tons of sand and 20 hundred million tons of cement every year, and the ecological environment in China is overwhelmed for a long time. At present, the traditional method for treating the waste buildings by adopting a burying mode occupies a large amount of land for burying garbage, and also brings a series of problems about natural environment, energy, resources, sustainable development and the like. The construction waste is changed into valuable at that time, and the method is a key research and development project for recycling the waste. The waste concrete building is processed into the recycled fine aggregate for preparing the recycled concrete, so that the problem of environmental pollution is solved, the resource recycling is realized, and the waste of resources and energy is reduced.
The recycled fine aggregate is an aggregate with the particle size of 0-5 mm, which is obtained by crushing, cleaning, screening and other treatment processes of waste concrete blocks, and is a product formed by hydrating and coagulating natural aggregate and cement base. Wherein, the recycled fine aggregate is subjected to a larger external force in the crushing process, a large number of fine cracks are easy to appear in the aggregate, and the interior of the aggregate is in a loose and porous state. The recycled fine aggregate has a fine void structure, so that the recycled fine aggregate can be used as a reinforced cement-based microorganism self-repairing concrete carrier and has certain feasibility, and compared with recycled brick aggregate and expanded perlite which are used as carriers under the same particle size, the recycled brick aggregate and the expanded perlite have higher matrix strength, so that the mechanical property and the waterproof and anti-permeability performance of the self-repairing concrete are greatly improved.
Bacillus microorganisms in nature can produce compounds at cellular spores through certain calcium mineralization reaction mechanisms, thereby plugging or binding the porous media interface in contact with water oxygen. These substances were later identified as calcium carbonate and calcium carbonate-like inorganic compounds in different forms, which are independent of the environment and completely control the sedimentation process by the bacterial cells. Calcium mineralization is carried out when there is a suitable environment, and dormancy is carried out when the reaction conditions are not satisfied. Most microorganisms deposit calcium carbonate mainly in different forms, which is greatly influenced by environmental factors and does not involve a particular structural morphology. Because the main component of the concrete is essentially calcium salt, the self-repairing of concrete cracks is feasible by utilizing the capability of bacillus microorganism which is calcium carbonate to induce deposition, and the bacillus has more efficient repairing efficiency in alkaline environment, so that the regenerated fine aggregate has specific carrier advantages.
The bacillus microorganism is mainly repaired by forming calcium carbonate precipitation at spores in an aerobic environment. With a shift in carbonate equilibrium (CO)2To HCO3 -And CO3 2-) The calcium ions in the concrete medium react with the carbonate ions to aggregate to form insoluble calcium carbonate CaCO at the spore of the microorganism3The deposit can heal the crack to repair the crack. The mineralization process is that aerobic respiration metabolizes substrates to produce CO2With OH in solution-Reaction to HCO3 -Then reacting with Ca in cement paste under alkaline condition2+Continued reaction to form CaCO3And (4) crystals.
Disclosure of Invention
The invention aims to provide self-repairing concrete taking recycled fine aggregate as a carrier, which has high bioactivity, good structural durability and good economic benefit.
The invention also aims to provide a preparation method of the self-repairing concrete with the recycled fine aggregate as the carrier, so as to obtain the microorganism self-repairing concrete with high bioactivity, good structural durability, good economic benefit and simple operation.
The technical solution for realizing the purpose of the invention is as follows:
the self-repairing concrete with the recycled fine aggregate as the carrier comprises concrete ingredients and the self-repairing recycled fine aggregate, wherein the self-repairing recycled fine aggregate accounts for 5-25% of the self-repairing concrete in percentage by volume; the self-repairing recycled fine aggregate is prepared by impregnating a bacillus pasteurianus bacterial liquid with the recycled fine aggregate; the OD value of the pasteurella bacillus liquid is 1.2-1.8, and the volume mixing amount of the pasteurella bacillus liquid is 25% by taking cement in concrete as a calculation reference.
Optionally, the self-repairing recycled fine aggregate accounts for 15% of the self-repairing concrete by volume percentage.
Optionally, the process of impregnating the pasteurella bacteria liquid with the recycled fine aggregate comprises the following steps: vacuum and negative pressure of 0.5Mpa for 20 min.
Optionally, the recycled fine aggregate is crushed stone formed by crushing concrete construction waste; the recycled fine aggregate has the particle size of 0-5 mm and the apparent density of 2518kg/m3Bulk density 1255kg/m3The porosity was 56%, the crush index was 14.5%, the firmness was 7.8%, the water content was 1.08%, and the water absorption at 24 hours was 8.91%.
Optionally, the concrete ingredients are water by mass: sand: stone: 0.3-0.6% of cement: 3.10-3.5: 1.60-2.00: 1.00-1.50.
Optionally, the cement is PO 42.5 grade, and the density is 3100kg/m3(ii) a The sand has an apparent density of 2724.8kg/m3The water absorption is 1.02 percent, and the fineness modulus is 2.18;the natural macadam has an apparent density of 2801.8kg/m3The water absorption was 0.47%, and the crush index was 5.99.
The preparation method of the self-repairing concrete with the recycled fine aggregate as the carrier comprises the following steps of (1) preparing the self-repairing concrete by taking the recycled fine aggregate as the carrier, wherein the self-repairing concrete comprises concrete and the self-repairing recycled fine aggregate, and the self-repairing recycled fine aggregate accounts for 5-25% of the self-repairing concrete in percentage by volume; the self-repairing recycled fine aggregate is prepared by impregnating a bacillus pasteurianus bacterial liquid with the recycled fine aggregate, and the process of impregnating the bacillus pasteurianus bacterial liquid with the recycled fine aggregate is as follows: soaking and adsorbing under vacuum negative pressure of 0.5Mpa for 20 min; the OD value of the pasteurella bacillus liquid is 1.2-1.8; taking cement in concrete as a calculation reference, the volume mixing amount of the bacillus pasteurianus bacterial liquid is 25%; and mixing and stirring the concrete ingredients and the self-repairing recycled fine aggregate to obtain the self-repairing concrete.
Optionally, the self-repairing recycled fine aggregate accounts for 15% of the self-repairing concrete by volume percentage.
Optionally, the concrete ingredients are water by mass: sand: stone: 0.3-0.6% of cement: 3.10-3.5: 1.60-2.00: 1.00-1.50;
the cement is PO 42.5 grade, and the density is 3100kg/m3(ii) a The sand has an apparent density of 2724.8kg/m3The water absorption is 1.02 percent, and the fineness modulus is 2.18; the natural macadam has an apparent density of 2801.8kg/m3The water absorption was 0.47%, and the crush index was 5.99.
Optionally, the recycled fine aggregate is crushed stone formed by crushing concrete construction waste;
the particle size of the recycled fine aggregate is 0-5 mm, and the apparent density is 2518kg/m3Bulk density 1255kg/m3The porosity was 56%, the crush index was 14.5%, the firmness was 7.8%, the water content was 1.08%, and the water absorption at 24 hours was 8.91%.
The invention has the advantages that:
compared with other carriers, the carrier has the advantages of simple preparation, high strength, good microbial activity maintenance and easy operation, simultaneously realizes the change of waste from building wastes into valuables, improves the mechanical property and impermeability of a concrete structure, and enhances the self-repairing effect of a cement base. And the concrete is endowed with the capability of self-repairing damage, and the concrete can be automatically and effectively repaired when the concrete cracks appear in the initial stage, so that the cost for repairing the cracks in the later stage is greatly reduced, and the safety, the economy and the durability of the concrete structure are greatly improved.
The present invention will be described in further detail with reference to specific embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a comparison graph of average crack repair widths of self-repairing concrete 28d with recycled fine aggregate as a carrier in examples one, two and three;
FIG. 2 is a graph comparing the 0d (left) and 28d (right) crack repairing effects of self-repairing concrete using recycled fine aggregate as a carrier in the first embodiment;
FIG. 3 is a graph comparing the 0d (left) and 28d (right) crack repairing effects of self-repairing concrete using recycled fine aggregate as a carrier in example two;
FIG. 4 is a comparison graph of the 0d (left) and 28d (right) crack repairing effects of self-repairing concrete using recycled fine aggregate as a carrier in example three;
FIG. 5 is apparent diagrams of crack cracking forms of self-repairing concrete with recycled fine aggregates as carriers in examples I, II and III;
FIG. 6 is a 10000 times electron microscope image of the repaired product of example one.
Detailed Description
The recycled fine aggregate is processed from concrete waste in construction waste and is used for preparing particles with the particle size of not more than 5mm of concrete. Mainly comprises concrete particles, cement stone particles and a small amount of broken stones, wherein the concrete particles are formed by breaking waste concrete and are adhered with cement paste on the surface. The production process of the recycled fine aggregate comprises the following steps: performing primary selection, classified stacking, reinforcing steel bar removal and the like on raw materials; removing soil, light substances, reinforcing steel bars, organic matters and the like through multiple sorting; and (3) performing primary crushing, screening, secondary crushing, screening, separating, washing and the like to obtain the recycled fine aggregate.
The recycled fine aggregate adopted by the invention is taken from concrete construction waste, and is stone formed by crushing a product formed by hydrating and coagulating natural aggregate and a cement base. The surface of the recycled fine aggregate is slightly wrapped by cement, the surface is rough, and fine gaps exist in the recycled fine aggregate, so that the recycled fine aggregate is lower than a natural fine aggregate in the properties of strength, water absorption and the like, and the indexes are as follows: the recycled fine aggregate has a particle size of 0-5 mm and an apparent density of 2518kg/m3Bulk density 1255kg/m3The porosity was 56%, the crush index was 14.5%, the firmness was 7.8%, the water content was 1.08%, and the water absorption at 24 hours was 8.91%. Because the recycled fine aggregate is subjected to a large external force in the crushing process, a large number of fine cracks are easy to appear in the aggregate, and the interior of the aggregate is in a fine-void state. Therefore, the micro-void structure in the recycled fine aggregate can be used as a reinforced cement-based microorganism self-repairing concrete carrier, and simultaneously, compared with the carrier using expanded perlite or recycled brick aggregate, the high matrix strength of the recycled fine aggregate can greatly improve various performances of the self-repairing concrete.
In order to provide a better understanding of the products and methods of the present invention to those skilled in the art, the following examples illustrate the preparation. And compared with comparative examples to illustrate the advantages of the present invention.
The self-repairing concrete is prepared by mixing the traditional or common concrete ingredients in the industry with the self-repairing recycled fine aggregate, wherein the traditional or common concrete ingredients in the industry generally comprise water, cement, sand and stones, and the ingredient ratio of the concrete is 0.40:3.15:1.69: 1.00.
The volume mixing amount of the bacillus pasteurii bacterial liquid is 25 percent by taking cement in concrete as a calculation reference. The water-cement ratio is a main factor influencing the performance of the concrete, and the preparation error of the performance of the concrete can be accurately and better reduced by taking the cement dosage as a reference; the volume mixing amount of the bacterial liquid is 25%, and the optimal volume ratio considering the economical efficiency and the repairing efficiency is obtained based on analysis of a large amount of experimental data.
The equipment used in the present invention is conventional in the art unless otherwise specified.
The materials used in the present invention are all commercially available unless otherwise specified.
The first embodiment is as follows:
a method for manufacturing self-repairing concrete with recycled fine aggregate as a carrier comprises the following steps:
step 1: the recycled fine aggregate is taken from concrete waste which is removed from conventional civil and commercial buildings, the impurities such as glass, wood, fiber, plastic, reinforcing steel bars and the like in the concrete waste are manually removed, then the concrete waste is crushed and screened by a jaw crusher, and finally the recycled aggregate with the particle size range of 0-5 mm is manually screened out to be used as the recycled fine aggregate for the impregnation of microorganisms;
step 2: soaking the regenerated fine aggregate carrier in a microorganism liquid in a vacuumizing and soaking mode to obtain self-repairing regenerated fine aggregate; the method comprises the steps of purchasing a pasteurella bacillus liquid from Shaanxi institute of microbiology, placing the pasteurella bacillus liquid at a low temperature of 0-4 ℃ for 12 hours with an OD value of 1.6, placing the pasteurella bacillus liquid in a negative pressure vacuum pump, adding a regenerated fine aggregate carrier, vibrating and shaking uniformly to enable the pasteurella bacillus liquid to be distributed on the surface of a regenerated aggregate more uniformly, adsorbing for 20min under the condition that the vacuum negative pressure is 0.5Mpa, transferring the regenerated fine aggregate to an oven, drying for 12-16 h at a constant temperature of 40 ℃, and drying to constant weight, wherein the weight difference between the two weighing before and after drying is not more than 2 mg. The liquid culture medium of the microbial liquid is formed by mixing organic protein, sodium carbonate solution and sodium bicarbonate solution, wherein the mass ratio of the sodium carbonate solution to the sodium bicarbonate solution to the organic protein is 10-18%, and the baume degree of the sodium carbonate solution is 25-40 DEG Be.
And step 3: the concrete mix proportion is designed to be 0.40:3.15:1.69:1.00 of water, sand, stone and cement. According to volume percentage, the volume mixing amount of the self-repairing recycled fine aggregate is 15 percent of the volume of the total self-repairing concrete, and the volume mixing amount of the bacillus pasteurianus bacterial liquid is 25 percent by taking cement in the concrete as a calculation reference. The addition method of the recycled fine aggregate particles is to add the recycled fine aggregate particles when concrete is stirred, and the concrete member is self-compacting concrete.
And 4, step 4: and (3) pouring concrete on the concrete member according to the designed mixing proportion, curing and forming, then manufacturing cracks, and observing the repairing effect. The preparation method comprises the steps of preparing self-repairing concrete by machine stirring, standing for 48 hours after a test piece is formed, demolding, curing for 7 days at 85 +/-5% RH and 22 +/-2 ℃, and presetting cracks; loading a test piece by an electro-hydraulic servo pressure testing machine through a three-point method to preset cracks, specifically, loading the test piece by a debugging press at a speed of 0.05mm/min, stopping loading when a crack of 0.1-0.3 mm appears at the lowest end of a pulled side surface of the test piece, and unloading after holding the load for 90 s; and (5) watering and maintaining the test piece, and measuring the repairing performance through a 150X crack observation instrument and an electronic scanning microscope.
The cement is PO 42.5 grade, and the density is 3100kg/m3(ii) a The recycled fine aggregate has a particle size of 0-5 mm and an apparent density of 2518kg/m3Bulk density 1255kg/m3The porosity was 56%, the crush index was 14.5%, the firmness was 7.8%, the water content was 1.08%, and the water absorption at 24 hours was 8.91%. The apparent density of the sand was 2724.8kg/m3The water absorption is 1.02 percent, and the fineness modulus is 2.18; the natural crushed stone has an apparent density of 2801.8kg/m3The water absorption was 0.47%, and the crush index was 5.99.
As shown in FIG. 2, it was found that the crack repairing effect of this example was good, and 28d almost reached the full-repair state.
As shown in FIG. 6, a repair substance CaCO3The uniform regular polygonal crystals are bonded at the fine aggregate and the mortar pores in a tiled or stacked mode, so that the anti-erosion capacity of the crack cracking surface can be effectively improved, and the homogeneity of the crack can be improved after the crack is repaired.
Example two:
the self-repairing concrete using the recycled fine aggregate as the carrier comprises water, sand, stone and cement in a mass mixing ratio of 0.40:3.15:1.69: 1.00.
The preparation method of the self-repairing concrete taking the recycled fine aggregate as the carrier in the embodiment is the same as that of the embodiment I, except that the carrier is taken as the recycled fine aggregate with volume accounting for 5% of the total volume of the self-repairing concrete.
As shown in FIG. 3, in the first comparative example, the crack repairing effect of the example is not obvious, and the 28d repairing effect is general.
Example three:
the self-repairing concrete using the recycled fine aggregate as the carrier comprises water, sand, stone and cement in a mass mixing ratio of 0.40:3.15:1.69: 1.00.
The preparation method of the self-repairing concrete taking the recycled fine aggregate as the carrier in the embodiment is the same as that of the embodiment I, except that the carrier is taken as the recycled fine aggregate with the volume accounting for 25% of the total volume of the self-repairing concrete.
As shown in fig. 4, the comparative examples i and ii find that the crack repairing effect of the example is good, and the 28d repairing effect is slightly lower than that of the example i but better than that of the example ii.
As shown in FIG. 1, the repairing effects of the self-repairing concrete with the volume content of 15% were most excellent by comparing the repairing cases of the recycled fine aggregate with the volume contents of 5%, 15% and 25%.
As shown in FIG. 5, the test pieces with the comparative 5%, 15% and 25% volume contents have different crack initiation patterns.
TABLE 1 comparison chart of crack widths of self-repairing concrete using recycled fine aggregate as carrier
As shown in table 1, the self-repairing concrete in the first example has slightly better crack repairing degree than the concrete in the third example at the same time, and is better than the concrete in the second example, the self-repairing recycled fine aggregate with the volume content of 15% has the best self-repairing performance, the total average crack repairing width is respectively 5% and 1.43 times and 1.16 times of the volume content of 25%, and finally the mechanical property and waterproof and anti-permeability performance measured in the first example are higher than those measured in the second example and the third example. Therefore, the self-repairing concrete in the first embodiment can enhance the cement-based self-repairing efficiency through the recycled fine aggregate, achieves a better repairing effect through higher mechanical properties of the self-repairing concrete, and has better practicability and economical efficiency.
Comparative example one:
in order to compare the influence of the expanded perlite carrier (the preparation and index parameters of the expanded perlite are quoted to patent No. CN 109320144A) and the recycled fine aggregate carrier on the crack repairing process in different time periods, under the same condition, a 150x crack observer is used for acquiring and observing the crack repairing width characterization repairing effect at a point, and the adding proportion, the preparation process and the impregnation mode are the same as those of the first embodiment.
TABLE 2 crack repair Effect at different times
As shown in Table 2, the two carriers have different degrees of restoration phenomena in 7 days, and the comparison shows that the regenerated fine aggregate carrier has the characteristics of earlier microbial restoration time and higher total crack restoration amount, the restoration effect of the test piece is most obvious in 28 days, and the good performance that the marked points are almost completely healed appears. Although the expanded perlite carrier also has a certain repairing effect in 7 days, the crack repairing effect is not obvious, the repairing effect of individual test pieces is better than that of the regenerated fine aggregate carrier in 14 days, the crack repairing is greatly improved in 28 days, and the repairing total amount is slightly lower than that of the regenerated fine aggregate carrier. The total restoration amount of the expanded perlite carrier group 28d is about 87% of the total restoration amount of the recycled fine aggregate.
Comparative example two:
in order to more highlight the repairing effect of the regenerated fine aggregate carrier, under the same condition and an impregnation mode, the regenerated brick aggregate (the preparation method and the index of the regenerated brick aggregate refer to patent No. CN102218435A) in the same particle size range is used as a carrier for comparison, the influence on the crack repairing process in different days is researched, and the crack repairing width at an observation point is collected by a 150x crack observation instrument to represent the repairing effect;
TABLE 3 crack repair Effect at different times
As shown in Table 3, compared with the recycled brick aggregate group, the excitation time of the microorganism using the recycled fine aggregate carrier is earlier, and the overall repairing effect is obviously better than that of the recycled brick aggregate group. The crack repairing effect of the recycled fine aggregate carrier group at 7d is obviously better than that of the recycled brick aggregate carrier, the repairing effect of the recycled brick aggregate carrier group at 7d hardly occurs, and the low-efficiency repairing effect is kept along with the prolonging of time. The repairing effect of the two carriers at 14d is relatively close, and the crack is repaired more greatly than the crack at 7 d; the recycled brick aggregate is a carrier, and a certain repairing effect is also achieved in 28d, the overall repairing effect is slightly lower than that of the expanded perlite carrier group, and the repairing total amount of the recycled brick aggregate carrier group 28d is about 63% of that of the recycled fine aggregate.
In the present embodiment, the purpose, technical solution and advantages of the present invention are further described in the following embodiments, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of the various embodiments of the present disclosure can be made, and the same should be considered as the inventive content of the present disclosure, as long as the combination does not depart from the spirit of the present disclosure.
Claims (5)
1. The self-repairing concrete with the recycled fine aggregate as the carrier is characterized by comprising concrete ingredients and the self-repairing recycled fine aggregate, wherein the self-repairing recycled fine aggregate accounts for 5-25% of the self-repairing concrete in percentage by volume;
the recycled fine aggregate is a crushed stone formed by crushing concrete construction waste; the recycled fine aggregate has the particle size of 0-5 mm and the apparent density of 2518kg/m3Bulk density 1255kg/m3A porosity of 56%, a crush index of 14.5%, a firmness of 7.8%, a water content of 1.08%, and a water absorption of 8.91% for 24 hours;
the OD value of the pasteurella bacillus liquid is 1.2-1.8, and the volume mixing amount of the pasteurella bacillus liquid is 25% by taking cement in concrete ingredients as a calculation reference;
the self-repairing recycled fine aggregate is prepared by impregnating a bacillus pasteurianus bacterial liquid with the recycled fine aggregate; the method comprises the following specific steps: soaking and adsorbing the pasteurella bacteria liquid for 20min under the vacuum negative pressure condition, and drying in an oven at constant temperature to obtain the self-repairing recycled fine aggregate; the bacillus pasteurii bacterial liquid is obtained by cultivating bacillus pasteurii strains in a liquid culture medium, wherein the liquid culture medium is formed by mixing organic protein, a sodium carbonate solution and a sodium bicarbonate solution, the mass ratio of the sodium carbonate solution to the sodium bicarbonate solution to the organic protein is 10% -18%, and the baume degree of the sodium carbonate solution is 25-40 DEG Be;
the concrete comprises the following ingredients in percentage by mass: sand: natural stone breaking: cement = 0.3-0.6: 3.10-3.5: 1.60-2.00: 1.00-1.50.
2. The self-repairing concrete with the recycled fine aggregate as the carrier of claim 1, wherein the volume percentage of the self-repairing recycled fine aggregate is 15 percent of that of the self-repairing concrete.
3. The self-repairing concrete with recycled fine aggregate as a carrier of claim 1, characterized in that the cement is P-O42.5 grade and has a density of 3100kg/m3(ii) a The sand has an apparent density of 2724.8kg/m3The water absorption is 1.02 percent, and the fineness modulus is 2.18; the natural macadam has an apparent density of 2801.8kg/m3The water absorption was 0.47%, and the crush index was 5.99.
4. The preparation method of the self-repairing concrete with the recycled fine aggregate as the carrier is characterized in that the self-repairing concrete comprises concrete ingredients and the self-repairing recycled fine aggregate, and the self-repairing recycled fine aggregate accounts for 5-25% of the self-repairing concrete ingredients in percentage by volume; the OD value of the pasteurella bacillus liquid is 1.2-1.8, and the volume mixing amount of the pasteurella bacillus liquid is 25% by taking cement in concrete ingredients as a calculation reference;
the recycled fine aggregate is a crushed stone formed by crushing concrete construction waste; the particle size of the recycled fine aggregate is 0-5 mm, and the apparent density is 2518kg/m3Bulk density 1255kg/m3A porosity of 56%, a crush index of 14.5%, a firmness of 7.8%, a water content of 1.08%, and a water absorption of 8.91% for 24 hours;
the self-repairing recycled fine aggregate is prepared by impregnating a bacillus pasteurii bacterial liquid with the recycled fine aggregate, and comprises the following specific steps: soaking and adsorbing the pasteurella bacteria liquid for 20min under the vacuum negative pressure condition, and drying in an oven at constant temperature to obtain the self-repairing recycled fine aggregate; the bacillus pasteurii bacterial liquid is obtained by cultivating bacillus pasteurii strains in a liquid culture medium, wherein the liquid culture medium is formed by mixing organic protein, a sodium carbonate solution and a sodium bicarbonate solution, the mass ratio of the sodium carbonate solution to the sodium bicarbonate solution to the organic protein is 10% -18%, and the baume degree of the sodium carbonate solution is 25-40 DEG Be;
the concrete ingredients are water: sand: natural stone breaking: cement = 0.3-0.6: 3.10-3.5: 1.60-2.00: 1.00-1.50; saidThe cement is P.O 42.5 grade, and the density is 3100kg/m3(ii) a The sand has an apparent density of 2724.8kg/m3The water absorption is 1.02 percent, and the fineness modulus is 2.18; the natural macadam has an apparent density of 2801.8kg/m3Water absorption of 0.47% and crushing index of 5.99;
and mixing and stirring the concrete ingredients and the self-repairing recycled fine aggregate to obtain the self-repairing concrete.
5. The method for preparing the self-repairing concrete with the recycled fine aggregate as the carrier of claim 4, wherein the volume percentage of the self-repairing recycled fine aggregate is 15 percent of that of the self-repairing concrete.
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| CN111559889A (en) * | 2020-03-25 | 2020-08-21 | 西安建筑科技大学 | Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method |
| CN112374844A (en) * | 2020-10-27 | 2021-02-19 | 广州市净水有限公司 | Process for preparing biological bricks by recycling municipal domestic sludge incineration ash |
| CN112851170B (en) * | 2021-01-27 | 2022-07-26 | 西交利物浦大学 | Method for strengthening recycled aggregate concrete by utilizing microbial denitrification phenomenon and recycled aggregate concrete |
| CN115340313B (en) * | 2022-01-17 | 2023-04-18 | 浙江理工大学 | Method for reinforcing recycled aggregate by physical compound microbial technology |
| CN114591016B (en) * | 2022-01-20 | 2022-09-27 | 河南理工大学 | Method for reinforcing recycled aggregate by utilizing biological deposition |
| CN114873958B (en) * | 2022-06-07 | 2023-05-05 | 太原理工大学 | Crack self-repairing concrete suitable for sewage treatment tank and preparation method thereof |
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