A method for producing a micro-mineralized concrete

Abstract

The application provides a production method of micro-mineralized concrete, comprising the following steps: S1, checking the sealing property of a sealed concrete mixer and the sealing property of a carbon dioxide conveying pipeline; S2, opening a feeding bin cover of the sealed concrete mixer, and adding raw materials for making concrete, which comprises cement, fly ash, sand and water-reducing admixture; S3, closing the feeding bin cover of the sealed concrete mixer, and starting a driving motor; S4, opening a tap water conveying switch and a carbon dioxide conveying switch; S5, cooperating a stirring blade and a conical tooth cutter to stir the raw materials, and the stirring time is not less than 40s, and the stirring temperature is not less than 5 DEG C, so that the required micro-mineralized concrete is obtained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete production and relates to a production method of micro-mineralized concrete. BACKGROUND

[0002] At present, reducing greenhouse gas emissions, promoting green and low-carbon transformation and realizing sustainable development are the general trend, and it is necessary to vigorously develop carbon reduction and carbon sequestration technologies in concrete production under this general situation, therefore, it is necessary to design a production method of micro-mineralized concrete. SUMMARY

[0003] The application aims to solve the above problems of the prior art and provides a production method of micro-mineralized concrete.

[0004] The application can be achieved by the following technical scheme: a production method of micro-mineralized concrete, comprising the following steps: S1, checking the airtightness of a sealed concrete mixer and the airtightness of a carbon dioxide conveying pipeline; S2, opening a feeding bin cover of the sealed concrete mixer, adding raw materials for making concrete, including cement, fly ash, sand and water-reducing admixtures; S3, closing the feeding bin cover of the sealed concrete mixer and starting a driving motor; S4, opening a tap water conveying switch and a carbon dioxide conveying switch; S5, under the cooperation of stirring blades and conical tooth cutters, stirring the above-mentioned raw materials, the stirring time is not less than 40s, and the stirring temperature is not lower than 5 DEG C, so that the required micro-mineralized concrete is obtained.

[0005] In the step S2, the raw materials in each cubic meter of concrete include: not less than 200kg of cement, 50kg to 70kg of fly ash, 500kg to 1800kg of sand and 1kg to 10kg of water-reducing admixtures.

[0006] In the step S2, the cement consumption in each cubic meter of concrete is 200-500kg.

[0007] The carbon dioxide consumption in each cubic meter of concrete is 0.05%-0.5% of the cement consumption.

[0008] The sealed concrete mixer comprises a barrel body and a barrel cover, the barrel cover is installed on the barrel body, two feeding openings are formed in the barrel cover, two feeding bin covers capable of closing the feeding openings are hingedly connected to the barrel cover, the barrel cover is provided with a locking assembly for locking the feeding bin covers, a discharging opening is formed in the barrel body, the barrel body is provided with a fan-shaped door capable of closing the discharging opening through an opening and closing structure, an auxiliary box is vertically installed on the inner wall of the barrel body, and a plurality of tapered tooth knives are further formed on the outer wall of the auxiliary box; an opening is formed in the upper portion of the auxiliary box, the lower portion of the auxiliary box is connected with one end of an auxiliary pipe, the other end of the auxiliary pipe is connected with a water pipe, the water pipe is provided with a tap water conveying switch, a gas pipe is further connected to the upper portion of the water pipe, the gas pipe is provided with a carbon dioxide conveying switch, and the barrel cover is provided with a stirring mechanism.

[0009] In the present application, cement, fly ash, sand and water-reducing admixture are added into the barrel body through the feeding openings, water and carbon dioxide are added into the auxiliary box through the auxiliary pipe, and the cement, fly ash, sand and water-reducing admixture are uniformly stirred and mixed under the action of the stirring mechanism, so that the required micro-mineralized concrete is obtained.

[0010] The stirring mechanism comprises a power motor, a driving gear, a driven gear ring, a rotating ring and a fixed guide disc, the fixed guide disc is installed on the barrel cover through an installation piece, the rotating ring is rotatably connected to the fixed guide disc, a plurality of positioning shafts are uniformly installed on the rotating ring, the positioning shafts are rotatably connected to the middle portion of V-shaped linkage rods, the outer ends of the V-shaped linkage rods are fixedly provided with installation rods, the inner ends of the V-shaped linkage rods are connected to guide wheels, guide grooves matched with the guide wheels are formed in the fixed guide disc, the guide grooves comprise retaining groove portions and transposition avoiding groove portions, and the transposition avoiding groove portions are close to the auxiliary box, a scraping knife is installed on one of the installation rods and can be in contact with the inner wall of the barrel body, and stirring blades are installed on the remaining installation rods, the driven gear ring is installed on the rotating ring, the power motor is vertically installed on the barrel cover, the driving gear is installed on the output shaft end portion of the power motor, and the driving gear is engaged with the driven gear ring.

[0011] The driving gear is driven to rotate by the power motor, the driving gear drives the driven gear ring to rotate, the driven gear ring drives the rotating ring to synchronously rotate, and the stirring blades are driven to rotate together, the angle position and stirring range of the stirring blades are not fixed due to the cooperation of the guide grooves and the guide wheels in the rotating process of the stirring blades, so that the raw materials for making concrete can be more uniformly stirred, meanwhile, the guide wheels on the scraping knife can scrape the raw materials on the inner wall of the barrel body when the guide wheels are located in the retaining groove portions, and the scraping knife will not interfere with the auxiliary box when the guide wheels on the scraping knife are located in the transposition avoiding groove portions.

[0012] The barrel body is provided with a track body, a movable seat is horizontally slidably arranged on the track body, an electric control box is further arranged on the movable seat through a supporting rod, a bottom plate is arranged on the movable seat, a handle is arranged on the bottom plate, an unlocking rod is horizontally slidably connected to the handle, a longitudinal rod and a transverse rod are horizontally slidably arranged on the bottom plate, one end of the longitudinal rod is connected to a locking head, the other end of the longitudinal rod is connected to a working block, an inclined groove is formed in the working block, the transverse rod has a guide pin at one end matched with the inclined groove, the other end of the transverse rod is connected to the middle part of the unlocking rod, one side of the track body has a positioning rack matched with the locking head, and a spring is further arranged between the locking head and the bottom plate.

[0013] The handle is pulled to conveniently adjust the position of the electric control box.

[0014] The locking assembly comprises a locking screw and an arc-shaped pressing piece, the arc-shaped pressing piece is made of elastic material, the middle part of the arc-shaped pressing piece is provided with a connecting hole, a threaded hole is formed in the barrel cover, the threaded hole is arranged between the two charging ports, the locking screw passes through the connecting hole and is connected to the threaded hole, the locking screw is further provided with a limiting head, and the charging bin cover is further provided with a protruding edge abutting against the arc-shaped pressing piece.

[0015] The opening and closing structure comprises a cylinder, a rotating shaft and a driving arm, the rotating shaft is vertically rotatably arranged on the barrel body, the lower end of the rotating shaft is connected to the fan-shaped door, the upper end of the rotating shaft is fixedly connected to one end of the driving arm, the cylinder is horizontally rotatably arranged on the barrel body through a support, and the other end of the driving arm is rotatably connected to the end of the piston rod of the cylinder.

[0016] A movable lower hopper is further arranged below the discharge port, and the lower hopper is further connected to an adjusting mechanism.

[0017] The adjusting mechanism comprises an adjustable support, a connecting seat, a transverse rod, a U-shaped rod, an intermediate frame and a linkage gear, the connecting seat is arranged at one end of the adjustable support, the middle part of one side of the intermediate frame is rotatably connected to the connecting seat through a fixed shaft, the U-shaped rod and the transverse rod are slidably connected to the upper side and the lower side of the intermediate frame respectively, a vertical plate is arranged at one end of the transverse rod, a steering shaft is horizontally rotatably arranged on the vertical plate, the linkage gear is connected to the steering shaft, a first gear rack matched with the linkage gear is horizontally arranged on the lower section of the U-shaped rod, a second gear rack matched with the linkage gear is horizontally arranged on the upper part of the other side of the intermediate frame, a driving motor capable of rotating the steering shaft back and forth is further arranged on the vertical plate, a base plate is arranged at the other end of the adjustable support, a guide inclined plate is detachably arranged on the base plate, limiting blocks are arranged at the upper end and the lower end of the guide inclined plate, a guide wheel matched with the guide inclined plate is arranged at the other end of the transverse rod, and the middle upper part of the U-shaped rod is further connected to one end of the lower hopper through a connecting frame.

[0018] By driving the motor to rotate the steering shaft, the U-shaped rod can swing upward and extend away from the middle frame, so that the lower hopper is switched from a horizontal state to an inclined state and approaches the outlet, and the mixed micro-mineralized concrete can enter the lower hopper from the outlet, and finally be output.

[0019] The lower hopper is provided with a supporting wheel at the middle part matched with the middle frame.

[0020] Compared with the prior art, the micro-mineralized concrete production method has the advantages that: 1. The carbon dioxide sealing effect of the concrete is good, and the normal use of the concrete is met, and the method has the characteristics of practicality, strong popularization, etc.; 2. The method for preparing the concrete is simple and easy to implement, and is easy to popularize, and has a significant carbon reduction effect on the building material industry; 3. The sealing type concrete mixer is improved, so that the raw materials for preparing the concrete and carbon dioxide can be fully mixed and stirred, and the stirring effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a plane structure schematic diagram of the present application;

[0022] Figure 2 is a three-dimensional structure schematic diagram of the present application with some parts removed;

[0023] Figure 3 is a three-dimensional structure schematic diagram of the power motor, the driving gear and the driven gear ring in the present application;

[0024] Figure 4 is a plane structure schematic diagram of the stirring mechanism in the present application with some parts removed;

[0025] Figure 5 is a three-dimensional structure schematic diagram of the stirring mechanism in the present application with some parts removed;

[0026] Figure 6 is a plane structure schematic diagram of the adjusting mechanism in the present application;

[0027] Figure 7 is a structure schematic diagram of the present application with some parts removed;

[0028] In the figure, 1, leg; 2, barrel body; 3, barrel cover; 4, charging bin cover; 4a, convex edge; 5, power motor; 6, air cylinder; 7, air pipe; 8, water pipe; 9, rotating shaft; 10, sector door; 11, electric control box; 12, support rod; 13, track body; 14, arc-shaped pressing plate; 15, locking screw; 16, auxiliary pipe; 17, tap water conveying switch; 18, carbon dioxide conveying switch; 19, linkage gear; 20, driving arm; 21, support; 22, driving gear; 23, driven gear ring; 24, auxiliary box; 25, fixed guide disc; 25a, guide groove; 25a1, retaining groove portion; 25a2, transposition avoidance groove portion; 26, guide wheel; 27, positioning shaft; 28, V-shaped linkage rod; 29, mounting rod; 30, stirring blade; 31, rotating ring; 32, material scraping knife; 33, mounting piece; 34, adjustable support; 35, base plate; 36, fixed shaft; 37, vertical plate; 38, rack one; 39, U-shaped rod piece; 40, steering shaft; 41, rack two; 42, connecting frame; 43, lower hopper; 44, intermediate frame; 45, support wheel; 46, guide inclined plate; 47, transverse rod piece; 48, guide wheel; 49, limiting block; 50, connecting seat; 51, positioning rack; 52, movable seat; 53, locking head; 54, spring; 55, longitudinal rod; 56, handle; 57, unlocking rod; 58, transverse rod; 59, guide pin; 60, bottom plate; 61, working block; 61a, oblique groove. DETAILED DESCRIPTION

[0029] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0030] As Figures 1-7 shown, the production method of the micro-mineralized concrete includes the following steps: S1, checking the airtightness of the sealed concrete mixer and the sealing of the carbon dioxide conveying pipeline; S2, opening the charging bin cover 4 of the sealed concrete mixer, adding raw materials for making concrete, including cement, fly ash, sand and water-reducing admixture; S3, closing the charging bin cover 4 of the sealed concrete mixer, and starting the power motor 5; S4, opening the tap water conveying switch 17 and the carbon dioxide conveying switch 18; S5, under the cooperation of the stirring blade 30 and the conical tooth knife, the above-mentioned raw materials are stirred, the stirring time is not less than 40s, and the stirring temperature is not lower than 5℃, so that the required micro-mineralized concrete is obtained; in this embodiment, the stirring time is controlled at 100s, and the stirring temperature is controlled at 15-35℃.

[0031] In this embodiment, since carbon dioxide reacts with calcium hydroxide in concrete to form mineral calcium carbonate, the amount is relatively small, so it is called micro-mineralized concrete.

[0032] In step S2, the raw materials per cubic meter of concrete include: no less than 200 kg of cement, 50 kg to 70 kg of fly ash, 500 kg to 1800 kg of sand and stone, and 1 kg to 10 kg of water-reducing admixture.

[0033] In step S2, the amount of cement per cubic meter of concrete is 200-500 kg.

[0034] The amount of carbon dioxide per cubic meter of concrete is 0.05%-0.5% of the amount of cement.

[0035] In this embodiment, the raw materials per cubic meter of concrete include: 300 kg of cement, 55 kg of fly ash, 600 kg of sand and stone (the sand and stone can be selected to have an average particle size of less than 4.75 mm), 2 kg of water-reducing admixture, and the amount of carbon dioxide per cubic meter of concrete is 50 kg.

[0036] The sealed concrete mixer includes a barrel body 2 and a barrel cover 3, the barrel cover 3 is installed on the barrel body 2, two feeding openings are formed in the barrel cover 3, two feeding bin covers 4 capable of closing the feeding openings are hinged to the barrel cover 3, the barrel cover 3 is provided with a locking assembly for locking the feeding bin covers 4, a discharging opening is formed in the barrel body 2, the barrel body 2 is provided with a fan-shaped door 10 capable of closing the discharging opening through an opening and closing structure, an auxiliary box 24 is vertically installed on the inner wall of the barrel body 2, in this embodiment, the auxiliary box 24 is arranged directly above the discharging opening; a plurality of conical tooth knives are further formed on the outer wall of the auxiliary box 24, so that the water overflowing from the auxiliary box 24 can better contact the raw materials of the concrete, and at the same time, a certain crushing effect is achieved to avoid the occurrence of clumps in the concrete; the upper portion of the auxiliary box 24 is provided with an opening, the lower portion of the auxiliary box 24 is connected with one end of an auxiliary pipe 16, the other end of the auxiliary pipe 16 is connected with a water pipe 8, the water pipe 8 is provided with a tap water conveying switch 17, the upper side of the water pipe 8 is further connected with an air pipe 7, the air pipe 7 is provided with a carbon dioxide conveying switch 18, in practice, the water pipe 8 is connected with an existing tap water conveying pipeline, and the air pipe 7 is connected with an existing carbon dioxide conveying pipeline; the barrel cover 3 is provided with a stirring mechanism.

[0037] In the present application, the cement, fly ash, sand and stone and water-reducing admixture are added into the barrel body 2 from the feeding openings, the water and carbon dioxide are added into the auxiliary box 24 through the auxiliary pipe 16, and under the action of the stirring mechanism, the cement, fly ash, sand and stone and water-reducing admixture are stirred and mixed uniformly, so that the required micro-mineralized concrete is obtained.

[0038] The stirring mechanism comprises a power motor 5, a driving gear 22, a driven gear ring 23, a rotating ring 31 and a fixed guide disc 25, the fixed guide disc 25 is installed on the barrel cover 3 through a mounting piece 33, the rotating ring 31 is rotationally connected to the fixed guide disc 25, a plurality of positioning shafts 27 are uniformly installed on the rotating ring 31, in the embodiment, the number of the positioning shafts 27 is five; the positioning shaft 27 is rotationally connected to the middle part of a V-shaped linkage rod 28, the outer end of the V-shaped linkage rod 28 is fixed with a mounting rod 29, the inner end of the V-shaped linkage rod 28 is connected to a guide wheel 26, a guide groove 25a is formed in the fixed guide disc 25 and matched with the guide wheel 26, the guide groove 25a comprises a retaining groove part 25a1 and a transposition avoiding groove part 25a2, and the transposition avoiding groove part 25a2 is close to the auxiliary box 24, that is, when the corresponding guide wheel 26 moves to the transposition avoiding groove part 25a2, the stirring blade 30 or the material scraping cutter 32 will automatically retract inward, and the stirring angle of the stirring blade 30 will also change; the material scraping cutter 32 is installed on one of the mounting rods 29 and can be in contact with the inner wall of the barrel body 2, and the stirring blades 30 are installed on the remaining mounting rods 29, that is, the number of the stirring blades 30 is four; the driven gear ring 23 is installed on the rotating ring 31, the power motor 5 is vertically installed on the barrel cover 3, the driving gear 22 is installed on the output shaft end of the power motor 5, and the driving gear 22 is meshed with the driven gear ring 23; by adopting the structure, the driving gear 22 is driven to rotate by the power motor 5, the driven gear ring 23 is driven to rotate by the driving gear 22, the rotating ring 31 is synchronously rotated by the driven gear ring 23, and then the stirring blades 30 are rotated together, in the process of rotation of the stirring blades 30, the angle position and the stirring range of the stirring blades 30 are not fixed due to the cooperation of the guide groove 25a and the guide wheel 26, so that the raw materials for making concrete can be stirred more uniformly, at the same time, the guide wheel 26 on the material scraping cutter 32 can scrape the raw materials on the inner wall of the barrel body 2 when the guide wheel 26 is in the retaining groove part 25a1, and the material scraping cutter 32 will not interfere with the auxiliary box 24 when the guide wheel 26 on the material scraping cutter 32 is in the transposition avoiding groove part 25a2, the water is added by overflowing from the upper part of the auxiliary box 24 and flows downward from the outer wall of the auxiliary box 24 to the barrel body 2, and the stirring effect is good.

[0039] The barrel body 2 is provided with a track body 13, the track body 13 is horizontally slidably provided with a movable seat 52, the movable seat 52 is further provided with an electric control box 11 through a supporting rod 12, in the embodiment, the electric control box 11 is an existing product, and the electric control box 11 is connected with other components by using an existing technology, and the circuit of the electric control box 11 does not need to be redesigned; the movable seat 52 is provided with a bottom plate 60, the bottom plate 60 is provided with a handle 56, the handle 56 is horizontally slidably connected with an unlocking rod 57, the bottom plate 60 is horizontally slidably provided with a longitudinal rod 55 and a transverse rod 58, one end of the longitudinal rod 55 is connected with a locking head 53, the other end of the longitudinal rod 55 is connected with a working block 61, the working block 61 is provided with an inclined slot 61a, one end of the transverse rod 58 is provided with a guide pin 59 matched with the inclined slot 61a, the other end of the transverse rod 58 is connected with the middle part of the unlocking rod 57, one side of the track body 13 is provided with a positioning rack 51 matched with the locking head 53, and the locking head 53 and the bottom plate 60 are further provided with a spring 54; by adopting the structure, the position of the electric control box 11 can be conveniently adjusted by pulling the handle 56, and after adjustment, the position of the electric control box 11 can be locked by releasing the handle 56, so that the adjustment is convenient; during feeding, the electric control box 11 can be moved to the outer side of the barrel body 2, so that interference between the electric control box 11 and the feeding operation is avoided, and the electric control box 11 is prevented from being damaged.

[0040] The locking assembly comprises a locking screw 15 and an arc-shaped pressing piece 14, the arc-shaped pressing piece 14 is made of elastic material, the arc-shaped pressing piece 14 is provided with a connecting hole in the middle part, the barrel cover 3 is provided with a threaded hole, the threaded hole is arranged between the two feeding openings, the locking screw 15 passes through the connecting hole and is connected with the threaded hole, and the locking screw 15 is further provided with a limiting head; by adopting the structure, the limiting head is used to prevent the locking screw 15 from falling off the barrel cover 3, and the limiting head is detachably connected with the locking screw 15; the feeding bin cover 4 is further provided with a protruding edge 4a abutting against the arc-shaped pressing piece 14; the locking screw 15 is a hand screw; by adopting the structure, after the raw materials are added by opening the feeding bin cover 4 and then closing the feeding bin cover 4, the end of the arc-shaped pressing piece 14 abuts against the protruding edge 4a, and the locking screw 15 is rotated.

[0041] The opening and closing structure comprises a cylinder 6, a rotating shaft 9 and a driving arm 20, the rotating shaft 9 is vertically rotatably installed on the barrel body 2, the lower end of the rotating shaft 9 is connected with the sector-shaped door 10, the upper end of the rotating shaft 9 is fixedly connected with one end of the driving arm 20, the cylinder 6 is horizontally rotatably installed on the barrel body 2 through a support 21, and the other end of the driving arm 20 is rotatably connected with the piston rod end of the cylinder 6; by adopting the structure, the driving arm 20 is driven to move by the cylinder 6, the rotating shaft 9 is driven to rotate by the driving arm 20, and the sector-shaped door 10 is driven to rotate by the rotating shaft 9, so that the discharging opening can be in an open or closed state.

[0042] The lower discharge hopper 43 is also arranged below the discharge outlet and is connected with an adjusting mechanism; the adjusting mechanism comprises an adjustable support 34, a connecting seat 50, a transverse rod 47, a U-shaped rod 39, an intermediate frame 44 and a linkage gear 19, the connecting seat 50 is installed at one end of the adjustable support 34, the intermediate frame 44 is rotatably connected with the connecting seat 50 through a fixed shaft 36 at the middle of one side of the intermediate frame 44, in this embodiment, the intermediate frame 44 can rotate relative to the connecting seat 50 under the action of the fixed shaft 36; the U-shaped rod 39 and the transverse rod 47 are respectively slidably connected with the upper side and the lower side of the intermediate frame 44, specifically, the upper segment of the U-shaped rod 39 is slidably connected with the upper side of the intermediate frame 44, and the transverse rod 47 is slidably connected with the lower side of the intermediate frame 44; a vertical plate 37 is installed at one end of the transverse rod 47, a steering shaft 40 is horizontally rotatably installed on the vertical plate 37, the linkage gear 19 is connected with the steering shaft 40, a rack 38 matched with the linkage gear 19 is horizontally installed on the lower segment of the U-shaped rod 39, a rack 41 matched with the linkage gear 19 is horizontally installed on the upper part of the other side of the intermediate frame 44, a driving motor capable of rotating the steering shaft 40 back and forth is also installed on the vertical plate 37, a base plate 35 is installed at the other end of the adjustable support 34, a guide inclined plate 46 is detachably installed on the base plate 35, limiting blocks 49 are arranged on the upper end and the lower end of the guide inclined plate 46, a guide wheel 48 matched with the guide inclined plate 46 is installed at the other end of the transverse rod 47, and the middle upper part of the U-shaped rod 39 is further connected with one end of the lower discharge hopper 43 through a connecting frame 42; the middle part of the lower discharge hopper 43 is provided with a supporting wheel 45 matched with the intermediate frame 44; by adopting this structure, the driving motor drives the steering shaft 40 to rotate, the steering shaft 40 drives the linkage gear 19 to rotate, the linkage gear 19 is engaged with the rack 38 and the rack 41, and then the U-shaped rod 39 can swing upward and extend away from the intermediate frame 44, since the steering shaft 40 also approaches the connecting frame 42 during the rotation of the steering shaft 40, the vertical plate 37 also approaches the connecting frame 42, and then the transverse rod 47 also moves correspondingly, the guide wheel 48 on the transverse rod 47 is matched with the guide inclined plate 46, and then the intermediate frame 44 swings upward and inclines, and finally the lower discharge hopper 43 is switched from the horizontal state to the inclined state and approaches the discharge outlet, the stirred micro-mineralized concrete can enter the lower discharge hopper 43 from the discharge outlet, and finally the output is realized; by adopting this structure, the lower discharge hopper 43 can approach the discharge outlet as much as possible during the concrete discharging operation, and the lower discharge hopper 43 can be as far away from the discharge outlet as possible during the non-discharging operation, so that the lower discharge hopper 43 and the discharge outlet can be conveniently cleaned or maintained.

[0043] Experiment: The micro-mineralized concrete obtained in the examples was made into test pieces, and the following Table 1 was tested:

[0044] Table 1

[0045]

[0046] In summary, the micro-mineralized concrete can reach the design strength and meet the normal performance requirements.

[0047] The above components are all general standard components or components known to those skilled in the art, and the structure and principle thereof can be known by the technical personnel through a technical manual or through a conventional experimental method.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A method for producing a micro-mineralized concrete, characterized in that, The method comprises the following steps: S1, checking the sealing performance of the sealed concrete mixer and the sealing performance of the carbon dioxide conveying pipeline; S2, opening the charging bin cover (4) of the sealed concrete mixer, adding raw materials for making concrete, including cement, fly ash, sand and water reducing admixture; S3, closing the charging bin cover (4) of the sealed concrete mixer, starting the power motor (5); S4, opening the tap water conveying switch (17) and the carbon dioxide conveying switch (18); S5, under the cooperation of the stirring blade (30) and the conical tooth cutter, the above-mentioned raw materials are stirred, the stirring time is not less than 40s, and the stirring temperature is not lower than 5℃, so that the required micro-mineralized concrete is obtained; the sealed concrete mixer comprises a barrel body (2) and a barrel cover (3), the barrel cover (3) is installed on the barrel body (2), two charging ports are formed in the barrel cover (3), two charging bin covers (4) capable of sealing the charging ports are hinged to the barrel cover (3), the barrel cover (3) is provided with a locking assembly for locking the charging bin cover (4), a discharging port is formed in the barrel body (2), the barrel body (2) is provided with a fan-shaped door (10) capable of sealing the discharging port through an opening and closing structure, an auxiliary box (24) is vertically installed on the inner wall of the barrel body (2), a plurality of conical tooth cutters are further formed on the outer wall of the auxiliary box (24); the upper portion of the auxiliary box (24) is provided with an opening, the lower portion of the auxiliary box (24) is connected with one end of an auxiliary pipe (16), the other end of the auxiliary pipe (16) is connected with a water pipe (8), the water pipe (8) is provided with a tap water conveying switch (17), the upper side of the water pipe (8) is further connected with an air pipe (7), the air pipe (7) is provided with a carbon dioxide conveying switch (18), and the barrel cover (3) is provided with a stirring mechanism.The stirring mechanism comprises a power motor (5), a driving gear (22), a driven gear (23), a rotating ring (31) and a fixed guide disc (25), the fixed guide disc (25) is installed on the barrel cover (3) through a mounting piece (33), the rotating ring (31) is rotatably connected to the fixed guide disc (25), a plurality of positioning shafts (27) are uniformly installed on the rotating ring (31), the positioning shafts (27) are rotatably connected to the middle part of V-shaped linkage rods (28), the outer ends of the V-shaped linkage rods (28) are fixedly provided with mounting rods (29), the inner ends of the V-shaped linkage rods (28) are connected to guide wheels (26), guide grooves (25a) matched with the guide wheels (26) are formed in the fixed guide disc (25), the guide grooves (25a) comprise retaining groove portions (25a1) and transposition avoiding groove portions (25a2), the transposition avoiding groove portions (25a2) are close to the auxiliary box (24), a scraping knife (32) is installed on one of the mounting rods (29), the scraping knife (32) can be in contact with the inner wall of the barrel body (2), the remaining mounting rods (29) are all provided with stirring blades (30), the driven gear (23) is installed on the rotating ring (31), the power motor (5) is vertically installed on the barrel cover (3), the driving gear (22) is installed on the output shaft end of the power motor (5), and the driving gear (22) is engaged with the driven gear (23); a movable lower hopper (43) is further arranged below the discharge port, and the lower hopper (43) is further connected with an adjusting mechanism; the adjusting mechanism comprises an adjustable support (34), a connecting seat (50), a transverse rod (47), a U-shaped rod (39), an intermediate frame (44) and a linkage gear (19), the connecting seat (50) is installed on one end of the adjustable support (34), the intermediate frame (44) is rotatably connected to the connecting seat (50) through a fixed shaft (36) at the middle part of one side, the U-shaped rod (39) and the transverse rod (47) are slidably connected to the upper side and the lower side of the intermediate frame (44) respectively, a vertical plate (37) is installed on one end of the transverse rod (47), a steering shaft (40) is horizontally rotatably installed on the vertical plate (37), the linkage gear (19) is connected to the steering shaft (40), a rack one (38) matched with the linkage gear (19) is horizontally installed on the lower section of the U-shaped rod (39), a rack two (41) matched with the linkage gear (19) is horizontally installed on the upper part of the other side of the intermediate frame (44), a driving motor enabling the steering shaft (40) to rotate back and forth is further installed on the vertical plate (37), a base plate (35) is installed on the other end of the adjustable support (34), a guide inclined plate (46) is detachably installed on the base plate (35), limiting blocks (49) are arranged on the upper end and the lower end of the guide inclined plate (46), a guide wheel (48) matched with the guide inclined plate (46) is installed on the other end of the transverse rod (47), and one end of the lower hopper (43) is further connected to the middle upper part of the U-shaped rod (39) through a connecting frame (42).The barrel (2) is provided with a track body (13), the track body (13) is horizontally slidably provided with a movable seat (52), the movable seat (52) is further provided with an electric control box (11) through a supporting rod (12), the movable seat (52) is provided with a bottom plate (60), the bottom plate (60) is provided with a handle (56), the handle (56) is horizontally slidably connected with an unlocking rod (57), the bottom plate (60) is horizontally slidably provided with a longitudinal rod (55) and a transverse rod (58), one end of the longitudinal rod (55) is connected with a locking head (53), the other end of the longitudinal rod (55) is connected with a working block (61), the working block (61) is provided with an inclined slot (61a), one end of the transverse rod (58) is provided with a guide pin (59) matched with the inclined slot (61a), the other end of the transverse rod (58) is connected with the middle part of the unlocking rod (57), one side of the track body (13) is provided with a positioning rack (51) matched with the locking head (53), and the locking head (53) and the bottom plate (60) are further provided with a spring (54).

2. A method of producing a micro-mineralized concrete according to claim 1, characterized in that, The raw materials in each cubic meter of concrete include: no less than 200 kg of cement, 50 kg to 70 kg of fly ash, 500 kg to 1800 kg of sandstone, and 1 kg to 10 kg of water-reducing admixture.

3. A method of producing a micro-mineralized concrete according to claim 2, characterized in that, The amount of cement used in each cubic meter of concrete is 200-500 kg.

4. A method of producing a micro-mineralized concrete according to claim 3, characterized in that, The amount of carbon dioxide used in each cubic meter of concrete is 0.05%-0.5% of the amount of cement.

5. A method of producing a micro-mineralized concrete according to claim 1, characterized in that, The locking assembly comprises a locking screw (15) and an arc-shaped pressing plate (14), the arc-shaped pressing plate (14) is made of elastic material, the arc-shaped pressing plate (14) has a connecting hole in the middle, the barrel cover (3) is provided with a threaded hole between the two charging ports, the locking screw (15) passes through the connecting hole and is connected with the threaded hole, the locking screw (15) further has a limiting head, and the charging bin cover (4) further has a convex edge (4a) abutting against the arc-shaped pressing plate (14).

6. A method of producing a micro-mineralized concrete according to claim 1, characterized in that, The opening and closing structure comprises a cylinder (6), a rotating shaft (9) and a driving arm (20), the rotating shaft (9) is vertically rotatably installed on the barrel body (2), the lower end of the rotating shaft (9) is connected with the sector door (10), the upper end of the rotating shaft (9) is fixedly connected with one end of the driving arm (20), the cylinder (6) is horizontally rotatably installed on the barrel body (2) through a support (21), and the other end of the driving arm (20) is rotatably connected with the piston rod end of the cylinder (6).

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