A method for preparing enzymatic self-healing concrete

Abstract

The present invention relates to the field of building materials, and in particular to a method for preparing enzymatic self-healing concrete, comprising the following steps: S1: calcining cement clinker; adding 80-90 parts of limestone, 10-15 parts of loess, 1-2 parts of sodium fluorosilicate, 1-2 parts of iron ore, and 25-50 parts of fuel into a calcining furnace for calcining to obtain cement clinker, all raw materials are measured by weight; S2: waste gas recovery and separation; the carbon dioxide generated by calcination in S1 is recovered and separated by a waste gas separator; S3: preparation of enzymatic self-healing concrete; the carbon dioxide, water, cement clinker prepared in S1, microbial enzyme agent and aggregate separated in S2 are transported to an enzymatic self-healing concrete manufacturing device to obtain enzymatic self-healing concrete. The present invention collects the carbon dioxide generated during the cement calcination process and applies it to the preparation of self-healing concrete, thereby increasing the proportion of limestone and fuel, so that the proportion of carbon dioxide in its waste gas exceeds 95%, reducing the difficulty of waste gas recovery.

Description

Technical Field

[0001] The invention relates to the field of building materials, and in particular to a method for preparing enzymatic self-healing concrete. Background Art

[0002] Since concrete has a relatively low tensile strength, concrete cracking is common in engineering projects. Traditional methods for repairing concrete cracks include resin infusion, polymer immersion, nailing, grouting, surface treatment, replacement, etc. These methods can repair concrete cracks under certain conditions, but they can only be repaired when the cracks develop into larger ones, and smaller cracks cannot be repaired.

[0003] Self-healing concrete is a new type of building material with strong self-healing ability. Through the enzymatic action of microorganisms, carbonate ions are combined with calcium ions to obtain calcium carbonate, which automatically heals cracks.

[0004] In the prior art, since the healing rate of self-healing concrete is low, in order to increase the healing efficiency, carbon dioxide is usually injected into the water during production to increase the healing rate. However, in this process, a large amount of carbon dioxide needs to be released, which directly leads to atmospheric pollution. In addition, since cement itself produces a large amount of carbon dioxide during calcination, the production of self-healing concrete with high healing efficiency will produce huge carbon dioxide release, which is not in line with the country's sustainable development policy. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing enzymatic self-healing concrete to solve the above problems.

[0006] The present invention is achieved through the following technical solutions:

[0007] A method for preparing enzymatic self-healing concrete comprises the following steps:

[0008] S1: Cement clinker calcination;

[0009] 80-90 parts of limestone, 10-15 parts of loess, 1-2 parts of sodium fluorosilicate, 1-2 parts of iron ore, and 25-50 parts of fuel are added into a calcining furnace for calcining to obtain cement clinker, wherein all raw materials are calculated by weight;

[0010] S2: waste gas recovery and separation;

[0011] The carbon dioxide generated by calcination in S1 is recovered and separated through a waste gas separator;

[0012] S3: Preparation of enzymatic self-healing concrete;

[0013] The carbon dioxide, water separated from S2, cement clinker prepared in S1, microbial enzyme agent and aggregate are transported to an enzymatic self-healing concrete manufacturing device to obtain enzymatic self-healing concrete.

[0014] The present invention collects carbon dioxide generated during the cement calcination process and applies it to the preparation of self-healing concrete, thereby increasing the proportion of limestone and fuel, so that the proportion of carbon dioxide in the exhaust gas exceeds 95%, reducing the difficulty of exhaust gas recycling, and because the proportion of fuel is increased, the combustion efficiency is higher, so that the output and quality of cement are increased. The present invention applies the carbon dioxide generated by cement calcination to the preparation of self-healing concrete, which not only effectively uses the carbon dioxide generated by cement calcination, but also reduces the cost of using carbon dioxide in the preparation of self-healing concrete.

[0015] Preferably, in the enzymatic self-healing concrete manufacturing device, the preparation process specifically includes:

[0016] S3.1: Add carbon dioxide and water into a water storage tank, set the air pressure in the water storage tank to 2-3 standard atmospheres, and set the temperature to 10-15 degrees Celsius to obtain a carbon source liquid;

[0017] S3.2: adding aggregate, cement clinker and the carbon source liquid obtained in S3.1 into a concrete mixing tank and stirring, wherein the internal pressure of the concrete mixing tank is set to 2-3 standard atmospheric pressures and the temperature is set to 10-20 degrees to obtain concrete;

[0018] S3.3: Add the concrete and microbial enzyme accelerator obtained in S3.2 into the microbial enzyme accelerator mixing tank and stir them thoroughly, wherein the internal pressure is set to 2-3 standard atmospheric pressures and the temperature is set to 10-20 degrees to obtain enzymatic self-healing concrete.

[0019] Preferably, the weight ratio of the carbon source liquid to the aggregate and cement clinker in S3.2 is (1-2): (6-7): (10-15);

[0020] Preferably, the weight ratio of concrete to microbial enzyme accelerator in S3.3 is (1.6-2.5):100;

[0021] In the present invention, all processes involving carbon dioxide are set to 2-3 standard atmospheric pressures, so that the content of carbon dioxide in water is always maintained at a high level, thereby increasing the healing efficiency of self-healing concrete. In addition, by controlling the weight ratio between carbon source liquid, aggregate, cement, and microbial enzyme accelerator, the pH value of concrete approaches neutrality, thereby improving the survival rate of microorganisms and increasing the healing efficiency.

[0022] Preferably, the enzymatic self-healing concrete manufacturing device comprises a storage unit, a feeding unit, a stirring unit, and a sealing unit, wherein the feeding unit and the stirring unit are both installed and fixed in the sealing unit, and the storage unit transports the required raw materials to the stirring unit through the feeding unit.

[0023] Since water containing a large amount of carbon dioxide needs to be added during concrete mixing, the present invention provides a sealing unit to ensure the content of carbon dioxide in water to the greatest extent, thereby achieving maximum carbon dioxide sealing during the mixing process.

[0024] Preferably, the material storage unit includes a cement raw material tank, an aggregate raw material tank, a carbon dioxide pressurized tank, a microbial enzyme agent tank, and a water storage tank, wherein the gas outlet of the carbon dioxide pressurized tank is connected to the water storage tank, and carbon dioxide is added to the water storage tank.

[0025] The present invention needs to dissolve carbon dioxide in water, so the present invention is provided with a carbon dioxide pressurizing tank to increase the solubility of carbon dioxide in water through high pressure.

[0026] Preferably, the mixing unit includes a concrete mixing tank and a microbial enzyme accelerator mixing tank, wherein the feeding port of the microbial enzyme accelerator mixing tank is connected to the discharge port of the concrete mixing tank through a pipeline, so that after the mixing is completed, the concrete can directly enter the microbial enzyme accelerator mixing tank, the discharge ports of the cement raw material tank, the aggregate raw material tank and the water storage tank are all connected to the feeding port of the concrete mixing tank, and the discharge port of the microbial enzyme accelerator tank is connected to the feeding port of the microbial enzyme accelerator mixing tank.

[0027] Since the pH value of concrete is uneven when it is mixed, the survival rate of the microbial enzyme accelerator is extremely low when it comes into contact with an alkaline environment. Therefore, the present invention separates the mixing of concrete and the mixing of the microbial enzyme accelerator to ensure the activity and survival rate of the microbial enzyme accelerator in concrete to the greatest extent.

[0028] Preferably, the microbial enzyme accelerator stirring tank includes a tank body, a rotating part, and a stirring impeller, wherein the rotating part is mounted and fixed on the bottom of the tank body, and the stirring impeller is mounted and fixed on the rotating part, so that the rotating part drives the stirring impeller to rotate, and the stirring impeller is located in the tank body, and a discharge nozzle is provided on the stirring impeller. The microbial enzyme accelerator in the microbial enzyme accelerator tank is pressurized by a carbon dioxide pressure tank and then sprayed out, wherein the carbon dioxide pressure tank is connected to the microbial enzyme accelerator tank, and its discharge port is connected to the discharge nozzle of the stirring impeller.

[0029] Since the uniformity of the microbial enzyme accelerator during the stirring process directly affects the content and proportion of the microbial enzyme accelerator in the concrete, the present invention provides a discharge nozzle to pressurize the microbial enzyme accelerator in the microbial enzyme accelerator tank through a carbon dioxide pressure tank and then spray it out. When the carbon dioxide is sprayed out, the pH value of the concrete where the microbial enzyme accelerator is located will be reduced, thereby increasing the survival rate of the microbial enzyme accelerator. In addition, the microbial enzyme accelerator is sprayed out after being pressurized, which will make the stirring more uniform.

[0030] Preferably, the mixing impeller includes at least one blade, the distance from the lowest end to the highest end of the mixing impeller is smaller than the depth of concrete in the tank body during operation, and at least one discharge nozzle is provided on each blade, the discharge nozzle is in the shape of a slender strip, the discharge nozzle is provided on one side of the blade, and its two ends are respectively located at the lowest end and the highest end of the surface.

[0031] The discharge nozzle of the present invention is in the shape of an elongated strip, and is arranged on one side of the blade, and its two ends are respectively located at the lowest end and the highest end of the side, so that the microbial enzyme accelerator can be evenly distributed on the upper and lower concrete layers, making the distribution of the microbial enzyme accelerator in the concrete more uniform. During use, if cracks appear, they can be repaired to the greatest extent to ensure the efficiency of self-healing.

[0032] Preferably, a cavity is provided inside the blade, and the cavity is connected to the discharge nozzle, and an anti-blocking device is detachably installed and fixed outside the discharge nozzle, so that during the mixing process, concrete will not enter the discharge nozzle, wherein the anti-blocking device is a hollow cylinder without upper and lower bottoms, and its cross-sectional shape is the same as the shape of the discharge nozzle, and the lower bottom surface of the anti-blocking device is fixed to the discharge nozzle, so that when spraying, it is sprayed from the top of the anti-blocking device, and a one-way pressure switch is provided on the upper surface of the anti-blocking device. When the internal pressure of the anti-blocking device is greater than the threshold value of the one-way pressure switch, the one-way pressure switch is opened to spray.

[0033] Since there are smaller-diameter aggregates in the concrete, they may enter the cavity along the discharge nozzle and cause blockage of the discharge nozzle. Therefore, the present invention is provided with an anti-blocking device. When the pressure of the discharge nozzle is reduced, no blockage will occur. In addition, even if a small amount of aggregate enters the anti-blocking device during use, since the anti-blocking device is detachably connected, the cost of cleaning and maintenance will be greatly reduced.

[0034] Preferably, a discharge port is provided at the bottom of the tank body of the microbial enzyme agent stirring tank, a pipe is fixedly installed at the discharge port, the pipe passes through the sealing unit for discharge, a valve is provided in the pipe, and the connection between the pipe and the sealing unit is a sealed connection.

[0035] In order to effectively discharge the enzymatic self-healing concrete after mixing to the greatest extent, the present invention provides a discharge port at the bottom of the tank body of the microbial enzyme agent mixing tank, and discharges the concrete through a pipeline. Since the microbial enzyme agent mixing tank is in a sealed unit, during the mixing process, due to the large amount of carbon dioxide added, its internal pressure gradually increases. Therefore, when the valve is opened, its internal pressure will push the concrete to be discharged from the discharge port. When the internal and external pressures are equal, the concrete can be sucked out by connecting a negative pressure device to the outside of the pipeline.

[0036] Preferably, the sealing unit includes a sealed cabin, a pressure detection device, and a pressure relief device, wherein the pressure detection device and the pressure relief device are both installed in the sealed cabin. When pressure relief is required, the pressure relief device can discharge the carbon dioxide gas in the sealed cabin. The sealed cabin is provided with a mounting portion for mounting and fixing a concrete mixing tank and a microbial enzyme agent mixing tank.

[0037] Since the sealed cabin can only withstand limited pressure, the present invention provides a pressure detection device and a pressure relief device to protect the sealed cabin.

[0038] Preferably, the sealed cabin includes a fixed base and a movable cabin, wherein the fixed base is mounted on the ground, and the movable cabin is mounted and connected to the fixed base via a plurality of guide rods so that the movable cabin can move up and down relative to the fixed base, and the portion where the fixed base is connected to the movable cabin is sealed.

[0039] In order to better realize the maintenance and cleaning of each device in the sealed cabin, the present invention configures the sealed cabin as a fixed base and a movable cabin, and realizes low-cost cleaning and maintenance in an openable and closable manner.

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] 1. The present invention collects carbon dioxide generated during the cement calcination process and applies it to the preparation of self-healing concrete, thereby increasing the proportion of limestone and fuel, so that the proportion of carbon dioxide in the exhaust gas exceeds 95%, reducing the difficulty of exhaust gas recycling, and because the proportion of fuel is increased, the combustion efficiency is higher, so that the output and quality of cement are increased. The present invention applies the carbon dioxide generated by cement calcination to the preparation of self-healing concrete, which not only effectively treats the carbon dioxide generated by cement calcination, but also reduces the cost of using carbon dioxide in the preparation of self-healing concrete.

[0042] 2. In the present invention, all processes involving carbon dioxide are set to 2-3 standard atmospheric pressures, so that the content of carbon dioxide in water is always maintained at a high level, thereby increasing the healing efficiency of self-healing concrete. In addition, by controlling the weight ratio between carbon source liquid, aggregate, cement, and microbial enzyme accelerator, the pH value of concrete approaches neutrality, thereby improving the survival rate of microorganisms and increasing the healing efficiency.

[0043] 3. The present invention needs to dissolve carbon dioxide in water, so the present invention is provided with a carbon dioxide pressurized tank to increase the solubility of carbon dioxide in water through high pressure.

[0044] 4. Since the pH value of concrete is uneven when it is mixed, the survival rate of the microbial enzyme accelerator is extremely low when it comes into contact with an alkaline environment. Therefore, the present invention separates the mixing of concrete and the mixing of the microbial enzyme accelerator to ensure the activity and survival rate of the microbial enzyme accelerator in concrete to the greatest extent.

[0045] 5. Since the uniformity of the microbial enzyme accelerator during the stirring process directly affects the content and proportion of the microbial enzyme accelerator in the concrete, the present invention sets a discharge nozzle to pressurize the microbial enzyme accelerator in the microbial enzyme accelerator tank through a carbon dioxide pressure tank and then spray it out. When the carbon dioxide is sprayed out, the pH value of the concrete where the microbial enzyme accelerator is located will be reduced, thereby increasing the survival rate of the microbial enzyme accelerator. In addition, the microbial enzyme accelerator will be sprayed out after being pressurized, which will make the stirring more uniform.

[0046] 6. The discharge nozzle of the present invention is in the shape of a slender strip, and the discharge nozzle is arranged on one side of the blade, and its two ends are respectively located at the lowermost end and the uppermost end of the surface, so that the microbial enzyme accelerator can be evenly distributed on the upper and lower concrete layers, making the distribution of the microbial enzyme accelerator in the concrete more uniform. During use, if cracks appear, they can be repaired to the greatest extent to ensure the efficiency of self-healing.

[0047] 7. Since there are smaller-diameter aggregates in the concrete, they may enter the cavity along the discharge nozzle and cause blockage of the discharge nozzle. Therefore, the present invention is provided with an anti-blocking device. When the pressure of the discharge nozzle is reduced, no blockage will occur. In addition, even if a small amount of aggregate enters the anti-blocking device during use, since the anti-blocking device is detachably connected, the cost of cleaning and maintenance will be greatly reduced.

[0048] 8. In order to effectively discharge the enzymatic self-healing concrete after mixing to the greatest extent, the present invention provides a discharge port at the bottom of the tank body of the microbial enzyme agent mixing tank, and discharges the concrete through a pipe. Since the microbial enzyme agent mixing tank is in a sealed unit, during the mixing process, due to the large amount of carbon dioxide added, its internal pressure gradually increases. Therefore, when the valve is opened, its internal pressure will push the concrete to be discharged from the discharge port. When the internal and external pressures are equal, the concrete can be sucked out by connecting a negative pressure device to the outside of the pipeline.

[0049] 9. Since the sealed cabin can only withstand limited pressure, the present invention provides a pressure detection device and a pressure relief device to protect the sealed cabin.

[0050] 10. In order to better realize the maintenance and cleaning of each device in the sealed cabin, the present invention configures the sealed cabin as a fixed base and a movable cabin, and realizes low-cost cleaning and maintenance through an openable and closable manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0052] Figure 1 It is a structural schematic diagram of the present invention;

[0053] Figure 2 is a schematic diagram of the structure of the blade;

[0054] Figure 3 is a cross-sectional view of a blade;

[0055] Figure 4 is a side view of the blade;

[0056] Figure 5 is a cross-sectional view of the anti-blocking device;

[0057] Figure 6 It is a flow chart of the present invention.

[0058] The reference numerals represent: 1-concrete mixing tank, 2-microorganism enzyme agent mixing tank, 21-tank body, 22-rotating part, 23-mixing impeller, 231-blade, 232-discharge nozzle, 233-anti-blocking device, 234-one-way pressure switch, 24-pipeline, 25-valve, 3-sealed cabin, 31-fixed base, 32-mobile cabin. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the solution of the present application, the following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0060] It should be noted that if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0061] In this application, if the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0062] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0063] In addition, in this application, the terms "installed", "set", "provided with", "connected", "connected", "socketed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0064] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0065] Example

[0066] like Figures 1 to 6 As shown, this embodiment includes.

[0067] A method for preparing enzymatic self-healing concrete comprises the following steps:

[0068] S1: Cement clinker calcination;

[0069] 90 parts of limestone, 15 parts of loess, 1 part of sodium fluorosilicate, 1 part of iron ore and 30 parts of fuel are added into a calcining furnace for calcining to obtain cement clinker, wherein all raw materials are calculated by weight;

[0070] S2: waste gas recovery and separation;

[0071] The carbon dioxide generated by calcination in S1 is recovered and separated through a waste gas separator;

[0072] S3: Preparation of enzymatic self-healing concrete;

[0073] The carbon dioxide, water separated from S2, cement clinker prepared in S1, microbial enzyme agent and aggregate are transported to an enzymatic self-healing concrete manufacturing device to obtain enzymatic self-healing concrete.

[0074] The present invention collects carbon dioxide generated during the cement calcination process and applies it to the preparation of self-healing concrete, thereby increasing the proportion of limestone and fuel, so that the proportion of carbon dioxide in the exhaust gas exceeds 95%, reducing the difficulty of exhaust gas recycling, and because the proportion of fuel is increased, the combustion efficiency is higher, so that the output and quality of cement are increased. The present invention applies the carbon dioxide generated by cement calcination to the preparation of self-healing concrete, which not only effectively uses the carbon dioxide generated by cement calcination, but also reduces the cost of using carbon dioxide in the preparation of self-healing concrete.

[0075] In this embodiment, in the enzymatic self-healing concrete manufacturing device, the preparation process specifically includes:

[0076] S3.1: Add carbon dioxide and water into a water storage tank, set the air pressure in the water storage tank to 3 standard atmospheres, and set the temperature to 10-15 degrees Celsius to obtain a carbon source liquid;

[0077] S3.2: adding aggregate, cement clinker and the carbon source liquid obtained in S3.1 into a concrete mixing tank 1 and stirring, wherein the internal pressure of the concrete mixing tank 1 is set to 3 standard atmospheres and the temperature is set to 10 degrees to obtain concrete;

[0078] S3.3: Add the concrete and microbial enzyme accelerator obtained in S3.2 into the microbial enzyme accelerator mixing tank 2 and stir them thoroughly, wherein the internal pressure is set to 3 standard atmospheres and the temperature is set to 10 degrees to obtain enzymatic self-healing concrete.

[0079] In S3.2, the weight ratio of carbon source liquid to aggregate and cement clinker is 1:6:10;

[0080] The weight ratio of concrete to microbial enzyme accelerator in S3.3 is 1.6:100.

[0081] In the present invention, all processes involving carbon dioxide are set to 3 standard atmospheres, so that the content of carbon dioxide in water is always maintained at a high level, thereby increasing the healing efficiency of self-healing concrete. In addition, by controlling the weight ratio between carbon source liquid, aggregate, cement, and microbial enzyme accelerator, the pH value of concrete approaches neutrality, thereby improving the survival rate of microorganisms and increasing the healing efficiency.

[0082] In this embodiment, the enzymatic self-healing concrete manufacturing device includes a storage unit, a feeding unit, a stirring unit, and a sealing unit. The feeding unit and the stirring unit are both installed and fixed in the sealing unit, and the storage unit transports the required raw materials to the stirring unit through the feeding unit.

[0083] Since water containing a large amount of carbon dioxide needs to be added during concrete mixing, the present invention provides a sealing unit to ensure the content of carbon dioxide in water to the greatest extent, thereby increasing the carbonate ions in water to the greatest extent during the mixing process.

[0084] In this embodiment, the material storage unit includes a cement raw material tank, an aggregate raw material tank, a carbon dioxide pressurized tank, a microbial enzyme agent tank, and a water storage tank, wherein the gas outlet of the carbon dioxide pressurized tank is connected to the water storage tank, and carbon dioxide is added to the water storage tank.

[0085] The present invention needs to dissolve carbon dioxide in water, so the present invention is provided with a carbon dioxide pressurizing tank to increase the solubility of carbon dioxide in water through high pressure.

[0086] In this embodiment, the mixing unit includes two concrete mixing tanks 1 and a microbial enzyme agent mixing tank 2, wherein the feeding port of the microbial enzyme agent mixing tank 2 is connected to the discharge port of the concrete mixing tank 1 through a pipeline, so that after the mixing is completed, the concrete can directly enter the microbial enzyme agent mixing tank 2, and the discharge ports of the cement raw material tank, the aggregate raw material tank and the water storage tank are all connected to the feeding port of the concrete mixing tank 1. The discharge port of the microbial enzyme agent tank is located above the feeding port of the microbial enzyme agent mixing tank 2, so that the material can be directly added to the microbial enzyme agent tank during discharge.

[0087] Since the pH value of concrete is uneven when it is mixed, the survival rate of the microbial enzyme accelerator is extremely low when it comes into contact with an alkaline environment. Therefore, the present invention separates the mixing of concrete and the mixing of the microbial enzyme accelerator to ensure the activity and survival rate of the microbial enzyme accelerator in concrete to the greatest extent.

[0088] In this embodiment, the microbial enzyme agent stirring tank 2 includes a tank body 21, a rotating part 22, and a stirring impeller 23, wherein the rotating part 22 is installed and fixed at the bottom of the tank body 21, and the stirring impeller 23 is installed and fixed on the rotating part 22, so that the rotating part 22 drives the stirring impeller 23 to rotate, and the stirring impeller 23 is located in the tank body 21. The stirring impeller 23 is provided with a discharge nozzle 232, and the microbial enzyme agent in the microbial enzyme agent tank is pressurized by a carbon dioxide pressure tank and then sprayed out, wherein the carbon dioxide pressure tank is connected to the microbial enzyme agent tank, and its discharge port is connected to the discharge nozzle 232 of the stirring impeller 23.

[0089] Since the uniformity of the microbial enzyme accelerator during the mixing process directly affects the content and proportion of the microbial enzyme accelerator in the concrete, the present invention sets a discharge nozzle 232, and the microbial enzyme accelerator in the microbial enzyme accelerator tank is pressurized by a carbon dioxide pressure tank and then sprayed out. When the carbon dioxide is sprayed out, the pH value of the concrete where the microbial enzyme accelerator is located will be reduced, thereby increasing the survival rate of the microbial enzyme accelerator. In addition, the microbial enzyme accelerator is sprayed out after being pressurized, which will make the mixing more uniform.

[0090] In this embodiment, the stirring impeller 23 has blades 231, and the rotation planes of the two blades 231 are not in the same plane. The distance from the lowermost end to the uppermost end of the stirring impeller 23 is smaller than the depth of the concrete in the tank body 21 during operation, and each blade 231 is provided with a discharge nozzle 232, which is in the shape of a slender strip. The discharge nozzle 232 is arranged on one side of the blade 231, and its two ends are respectively located at the lowermost end and the uppermost end of the surface.

[0091] The discharge nozzle 232 of the present invention is in the shape of a slender strip. The discharge nozzle 232 is arranged on one side of the blade 231, and its two ends are respectively located at the lowermost end and the uppermost end of the surface, so that the microbial enzyme accelerator can be evenly distributed on the upper and lower concrete layers, making the distribution of the microbial enzyme accelerator in the concrete more uniform. During use, if cracks appear, they can be repaired to the greatest extent to ensure the efficiency of self-healing.

[0092] In this embodiment, a cavity is provided inside the blade 231, and the cavity is connected to the discharge nozzle 232, and an anti-blocking device 233 is detachably installed and fixed outside the discharge nozzle, so that during the mixing process, concrete will not enter the discharge nozzle 232, wherein the anti-blocking device 233 is a hollow cylinder without upper and lower bottoms, and its cross-sectional shape is the same as the shape of the discharge nozzle 232, and the lower bottom surface of the anti-blocking device 233 is fixedly installed on the discharge nozzle 232, so that when spraying, it is sprayed from the top of the anti-blocking device 233, and a one-way pressure switch 234 is provided on the upper surface of the anti-blocking device 233. When the internal pressure of the anti-blocking device 233 is greater than the threshold value of the one-way pressure switch 234, the one-way pressure switch 234 is opened to spray.

[0093] In this embodiment, the cross-sectional shape of the hollow channel of the anti-blocking device 233 is two isosceles trapezoids spliced ​​together, where the splicing position is the upper base of the two isosceles trapezoids. This arrangement increases the spraying pressure again, while also preventing fine aggregates from entering the cavity, reducing the possibility of blockage.

[0094] Since there are aggregates with smaller diameters in the concrete, they may enter the cavity along the discharge nozzle 232 and cause blockage of the discharge nozzle 232. Therefore, the present invention is provided with an anti-blocking device 233. When the pressure of the discharge nozzle 232 is reduced, no blockage will occur. In addition, even if a small amount of aggregate enters the anti-blocking device 233 during use, since the anti-blocking device 233 is a detachable connection, the cost of cleaning and maintenance will be greatly reduced.

[0095] In this embodiment, a discharge port is provided at the bottom of the tank body 21 of the microbial enzyme agent stirring tank 2, and a pipe 24 is installed and fixed at the discharge port. The pipe 24 passes through the sealing unit for discharge, and a valve 25 is provided in the pipe 24. The connection between the pipe 24 and the sealing unit is a sealed connection.

[0096] In order to effectively remove the enzymatic self-healing concrete after mixing to the greatest extent, the present invention is provided with a discharge port at the bottom of the tank body 21 of the microbial enzyme agent mixing tank 2, and the concrete is discharged through the pipe 24. Since the microbial enzyme agent mixing tank 2 is in a sealed unit, during the mixing process, due to the large amount of carbon dioxide added, its internal pressure gradually increases. Therefore, when the valve 25 is opened, the internal pressure will push the concrete to be discharged from the discharge port. When the internal and external pressures are equal, the concrete can be sucked out by connecting a negative pressure device to the pipe 24.

[0097] In this embodiment, the sealing unit includes a sealed cabin 3, a pressure detection device, and a pressure relief device, wherein the pressure detection device and the pressure relief device are both installed in the sealed cabin 3. When pressure relief is required, the pressure relief device can discharge the carbon dioxide gas in the sealed cabin 3. The sealed cabin 3 is provided with an installation portion for installing and fixing the concrete mixing tank 1 and the microbial enzyme agent mixing tank 2.

[0098] Since the sealed cabin 3 can withstand limited pressure, the present invention provides a pressure detection device and a pressure relief device to protect the sealed cabin 3 .

[0099] In this embodiment, the sealed cabin 3 includes a fixed base 31 and a movable cabin 32, wherein the fixed base 31 is installed and fixed on the ground, and the movable cabin 32 is installed and connected to the fixed base 31 through a plurality of guide rods, so that the movable cabin 32 can move up and down relative to the fixed base 31, and the part where the fixed base 31 and the movable cabin 32 are connected is sealed.

[0100] In order to better maintain and clean the various devices in the sealed cabin 3, the present invention configures the sealed cabin 3 as a fixed base 31 and a movable cabin 32, and realizes low-cost cleaning and maintenance in an openable and closable manner.

[0101] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing enzymatic self-healing concrete, characterized in that: The steps include: S1: Cement clinker calcination; 80-90 parts of limestone, 10-15 parts of loess, 1-2 parts of sodium fluorosilicate, 1-2 parts of iron ore, and 25-50 parts of fuel are added into a calcining furnace for calcining to obtain cement clinker, wherein all raw materials are calculated by weight; S2: waste gas recovery and separation; The carbon dioxide generated by calcination in S1 is recovered and separated through a waste gas separator; S3: Preparation of enzymatic self-healing concrete; The carbon dioxide, water separated from S2, cement clinker prepared in S1, microbial enzyme agent and aggregate are transported to an enzymatic self-healing concrete manufacturing device to obtain enzymatic self-healing concrete; The preparation process specifically includes: S3.1: Add carbon dioxide and water into a water storage tank, set the air pressure in the water storage tank to 2-3 standard atmospheres, and set the temperature to 10-15 degrees Celsius to obtain a carbon source liquid; S3.2: adding aggregate, cement clinker and the carbon source liquid obtained in S3.1 into a concrete mixing tank (1) and stirring, wherein the internal pressure of the concrete mixing tank (1) is set to 2-3 standard atmospheric pressures and the temperature is set to 10-20 degrees, to obtain concrete; S3.3: Add the concrete and microbial enzyme accelerator obtained in S3.2 into the microbial enzyme accelerator mixing tank (2) and stir them thoroughly, wherein the internal pressure is set to 2-3 standard atmospheric pressures and the temperature is set to 10-20 degrees, to obtain enzymatic self-healing concrete; The enzymatic self-healing concrete manufacturing device comprises a storage unit, a feeding unit, a stirring unit, and a sealing unit; wherein the feeding unit and the stirring unit are both installed and fixed in the sealing unit, and the storage unit transports the required raw materials to the stirring unit through the feeding unit; The weight ratio of carbon source liquid to aggregate and cement clinker in S3.2 is (1-2):(6-7):(10-15); The weight ratio of concrete to microbial enzyme accelerator in S3.3 is (1.6-2.5):

100.

2. A method for preparing enzymatic self-healing concrete according to claim 1, characterized in that: The material storage unit comprises a cement raw material tank, an aggregate raw material tank, a carbon dioxide pressurizing tank, a microbial enzyme agent tank, and a water storage tank, wherein the gas outlet of the carbon dioxide pressurizing tank is connected to the water storage tank, and carbon dioxide is added to the water storage tank.

3. A method for preparing enzymatic self-healing concrete according to claim 2, characterized in that: The mixing unit comprises a concrete mixing tank (1) and a microbial enzyme agent mixing tank (2), wherein the feeding port of the microbial enzyme agent mixing tank (2) is connected to the discharge port of the concrete mixing tank (1) via a pipeline, so that after mixing, the concrete can directly enter the microbial enzyme agent mixing tank (2), the discharge ports of the cement raw material tank, the aggregate raw material tank and the water storage tank are all connected to the feeding port of the concrete mixing tank (1), and the discharge port of the microbial enzyme agent tank is connected to the feeding port of the microbial enzyme agent mixing tank (2).

4. A method for preparing enzymatic self-healing concrete according to claim 3, characterized in that: The microbial enzyme agent stirring tank (2) comprises a tank body (21), a rotating part (22), and a stirring impeller (23), wherein the rotating part (22) is fixedly mounted on the bottom of the tank body (21), and the stirring impeller (23) is fixedly mounted on the rotating part (22), so that the rotating part (22) drives the stirring impeller (23) to rotate, and the stirring impeller (23) is located in the tank body (21). The stirring impeller (23) is provided with a discharge nozzle (232), and the microbial enzyme agent in the microbial enzyme agent tank is pressurized by a carbon dioxide pressure tank and then sprayed out, wherein the carbon dioxide pressure tank is connected to the microbial enzyme agent tank, and its discharge port is connected to the discharge nozzle (232) of the stirring impeller (23).

5. A method for preparing enzymatic self-healing concrete according to claim 4, characterized in that: The stirring impeller (23) comprises at least one blade (231); the distance from the lowest end to the highest end of the stirring impeller (23) is smaller than the depth of concrete in the tank body (21) during operation; and each blade (231) is provided with at least one discharge nozzle (232); the discharge nozzle (232) is in the shape of an elongated strip; the discharge nozzle (232) is provided on one surface of the blade (231), and two ends of the discharge nozzle (232) are respectively located at the lowest end and the highest end of the surface.

6. A method for preparing enzymatic self-healing concrete according to claim 5, characterized in that: A cavity is provided inside the blade (231), and the cavity is communicated with the discharge nozzle (232). An anti-blocking device (233) is detachably mounted and fixed outside the storage nozzle, so that during the mixing process, concrete does not enter the discharge nozzle (232). The anti-blocking device (233) is a hollow cylinder without upper and lower bottoms, and its cross-sectional shape is the same as the shape of the discharge nozzle (232). The lower bottom surface of the anti-blocking device (233) is fixedly mounted on the discharge nozzle (232), so that when spraying, the material is sprayed from the top of the anti-blocking device (233). A one-way pressure switch (234) is provided on the upper surface of the anti-blocking device (233). When the internal pressure of the anti-blocking device (233) is greater than the threshold value of the one-way pressure switch (234), the one-way pressure switch (234) is opened to spray the material.

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