CN114776073A - Concrete microcrack grouting repair device based on industrial calcium-based solid waste and carbon dioxide tail gas and working method - Google Patents
Concrete microcrack grouting repair device based on industrial calcium-based solid waste and carbon dioxide tail gas and working method Download PDFInfo
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 58
- 239000011575 calcium Substances 0.000 title claims abstract description 58
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 56
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002910 solid waste Substances 0.000 title claims abstract description 27
- 230000008439 repair process Effects 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
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- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 34
- 238000002360 preparation method Methods 0.000 claims abstract description 32
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims abstract description 25
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims abstract description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 6
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- 230000000694 effects Effects 0.000 claims description 9
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229910001424 calcium ion Inorganic materials 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
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Abstract
The invention relates to a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas and a working method, and belongs to the field of concrete repairing. Comprises a repairing agent preparation device, a repairing agent conveying device and a grouting repairing device; a water injection port is arranged above the liquid storage tank, mixed liquid of calcium-based industrial solid materials and deionized water is prepared in the liquid storage tank according to the proportion, and a carbon dioxide tank is connected to the liquid storage tank through a pipeline; the repairing agent conveying device comprises a water pump and a conveying hose, the grouting repairing device comprises a liquid injection gun, the water pump conveys the solution in the liquid storage tank to the liquid injection gun through the conveying hose, and a heating plate is arranged on the liquid injection gun. The invention can seal and store carbon dioxide, and the prepared calcium bicarbonate solution is used as a concrete microcrack repairing agent, has high fluidity, can generate calcium carbonate crystals with cementing action in concrete microcracks, fills gaps and builds a net structure, and gradually forms an integral structure with the original concrete to finish crack repair.
Description
Technical Field
The invention relates to a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas and a working method, and belongs to the technical field of concrete repairing.
Background
Concrete is the main construction material of building structure, has played the decisive role to the quality and the life of building. Due to the influence of the brittleness and the service environment, the concrete can generate micro cracks and local damage in different degrees, the micro cracks and the local damage can be expanded into macro cracks if the micro cracks are not repaired in time after cracking, external water and erosion media can continuously and gradually permeate from the surface defects of the material, and finally the deterioration of the concrete is accelerated, so that immeasurable loss is caused. Therefore, effective measures are taken to repair the micro cracks of the concrete structure, and the method has important significance for improving the overall quality of the building structure, realizing the high requirement of the building industry on the building service life and meeting the self energy-saving and emission-reducing requirements of the concrete material industry.
At present, common methods for repairing concrete cracks include a surface treatment method, a chemical grouting method, a self-repairing material filling method, a structure reinforcing method, an electrodeposition method and the like. The method mainly comprises the step of pouring a completely new concrete material or a repair material which is prepared in advance into the concrete cracks, and although the surface cracks are good in repair effect, the micro cracks in the concrete members are difficult to repair. In particular, the surface treatment method makes it difficult to pour the repair material into the interior of the crack. For the fine cracks smaller than 0.2mm, concrete needs to be dug before filling the repairing material, and the polymer resin repairing material is frequently adopted to damage the structure to a certain extent. The long-term effect is not ideal due to shrinkage and aging. The chemical grouting material has the problems of high viscosity, high brittleness after curing, poor durability, environmental pollution and the like, and is difficult to judge whether the chemical grouting material and a structure form a whole after grouting. In addition, although the concrete has certain self-healing capacity for the micro-cracks, the crack width range of the self-healing capacity is 0.1-0.2 mm, and the requirement for repairing the concrete cracks in actual engineering cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a concrete microcrack grouting repair device based on industrial calcium-based solid waste and carbon dioxide tail gas and a working method thereof.
The technical scheme of the invention is as follows:
a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas comprises a repairing agent preparation device, a repairing agent conveying device and a grouting repairing device;
the repairing agent preparation device comprises a carbon dioxide gas tank and a slurry preparation box, wherein a liquid storage pool is arranged in the slurry preparation box, a water injection port is arranged above the liquid storage pool, mixed liquid of calcium-based industrial solid materials and deionized water is prepared in the liquid storage pool in proportion, industrial waste gas containing carbon dioxide is contained in the carbon dioxide gas tank, and the carbon dioxide gas tank is connected to the liquid storage pool through a pipeline;
the repairing agent conveying device comprises a water pump and a conveying hose, the grouting repairing device comprises a liquid injection gun, the water pump conveys a solution in a liquid storage tank to the liquid injection gun through the conveying hose, and a heating plate is arranged on the liquid injection gun and used for heating the area around the concrete structure crack.
Preferably, the liquid storage tank is provided with a stirring device, a pH monitor and a temperature controller, the pipelines of the carbon dioxide gas tank and the liquid storage tank are provided with a gas flow rate monitor for monitoring and regulating gas flow in real time, and the conveying hose is provided with a liquid flow rate sensor for monitoring the flow rate of the repairing agent in real time.
Preferably, the heating plate is an infrared heating plate, a through hole is formed in the middle of the infrared heating plate, and a fixing ring is arranged in the through hole and used for fixing the infrared heating plate at a proper position of the liquid outlet end of the liquid injection gun. Generally, the liquid outlet end of the liquid injection gun extends into the crack for consistent length, if the depth of the crack is too large or too small, the position of the infrared heating plate needs to be adjusted to enable the infrared heating plate to be tightly attached to the surface of the concrete, after the liquid outlet end extends into the crack, the fixing ring can be loosened, the heating plate is adjusted to be tightly attached to the surface of the concrete, and the fixing ring is screwed down to fix the heating plate.
Furthermore, the heating layer of the infrared heating plate is composed of a layer of carbon fiber conductive paper, electrodes are adhered to the carbon fiber conductive paper and are arranged between two substrate layers, the carbon fiber conductive paper is adhered to the two substrate layers and is hot-pressed and fused into a whole, the size of the infrared heating plate is about 60cm by 90cm, the thickness of the infrared heating plate is 1-2 cm (the size of the infrared heating plate can be adjusted according to engineering requirements), the temperature of a heating surface can reach 120 ℃, the infrared heating plate is a non-metal planar resistor body, electric energy is directly converted into radiant heat after the infrared heating plate is electrified, the infrared heating plate can radiate uniformly on the whole surface, the temperature consistency is good, the heating area is large, the heating speed is high, the penetrating capacity is high, and the accurate control of the heating temperature can be realized.
Preferably, the repairing agent preparation device and the water pump are both arranged on the mobile cart, and the pulley is arranged at the bottom of the mobile cart, so that the device can be conveniently moved;
preferably, the slurry preparation box is provided with a control screen, the control screen is in signal connection with the pH monitor and the temperature controller, the solution reaction temperature and the pH value change can be displayed in real time through the control screen, the solution reaction temperature can be regulated and controlled, and the temperature stability is ensured.
In the invention, the pH monitor can adopt an on-line pH100 pH value-pH meter of the Ackerent, the temperature controller can adopt an Autonics Autorx temperature controller, and the pH monitor and the temperature controller can be of other types capable of realizing the functions thereof, and the pH monitor and the temperature controller are not limited in particular.
Preferably, a solid material placing opening is formed in the slurry preparation box, a new calcium-based industrial solid material can be replaced through the solid material placing opening, a liquid outlet is formed in one side of the slurry preparation box, and the conveying hose is connected with the liquid outlet.
It should be noted that the instruments used in the present invention, such as the gas flow rate monitor, the control panel, the liquid flow rate sensor, the water pump, etc., can be conventional instruments, and are not described herein again.
The working method of the concrete microcrack grouting repairing device based on the industrial calcium-based solid waste and carbon dioxide tail gas comprises the following steps:
(1) moving the device to a construction area;
(2) placing the calcium-based industrial solid material and deionized water in a specified ratio in a liquid storage pool, starting a stirring device, wherein the stirring speed is 800 r/min-1000 r/min, introducing industrial waste gas containing carbon dioxide after the pH value of a solution in the liquid storage pool is stable, the gas flow rate is 0.40L/min-0.60L/min, preferably 0.50L/min, and the calcium-based industrial solid material is subjected to carbonation reaction, wherein the reaction process is as follows:
CO2dissolved in water to form weakly acidic CO3 2-Ionization of CO3 2-With HCO3 -Under the action of alkalinity, HCO3 -With OH-Rapidly react to form H2O and CO3 2-，CO3 2-And Ca2+Reaction to form CaCO insoluble in water3And HCO3 -And Ca2+Generating chemical reaction to generate soluble salt, and adding the soluble salt into the solution to finally prepare a calcium bicarbonate solution as a repairing agent;
(3) the temperature and the pH value in the liquid storage tank are monitored in real time by adopting a temperature controller and a pH monitor, the temperature is controlled to be 4-6 ℃, calcium ions are favorably leached at the temperature of 4-6 ℃ in the preparation process of the calcium bicarbonate solution, the carbon fixation efficiency can be effectively improved, when the pH value is reduced to 5.8-6.2, the solution can be judged to be weakly acidic, excessive carbon dioxide is introduced, the introduction of carbon dioxide gas can be stopped, a solid material placing port is opened, and the calcium-based industrial solid material in the slurry preparation tank is replaced;
(4) after the repairing agent is prepared, opening a liquid outlet and a water pump, pumping the calcium bicarbonate solution into a liquid injection gun by the water pump through a conveying hose, and monitoring the flow speed change of the calcium bicarbonate solution in real time by a liquid flow speed sensor on the conveying hose, wherein the flow speed is 0.5-0.8 m/s;
(5) a heating plate is arranged at the pipe head of the liquid injection gun, a liquid outlet of the liquid injection gun is fixed at the periphery of the crack, the repairing agent is slowly injected into the crack, and when a small amount of the repairing agent flows out from the position close to the liquid injection port, the injection is immediately stopped;
(6) the method comprises the following steps of (1) injecting a repairing agent into a crack, starting a heating plate, heating the area around the crack of the concrete structure, setting the heating temperature at 60-65 ℃, wherein the solubility of a calcium bicarbonate solution is lowest at the temperature, calcite with better stability is most easily generated, the degradation of the concrete with the original structure can be caused by overhigh temperature, the calcium bicarbonate solution is decomposed, deposited and crystallized into calcium carbonate crystals with a cementing effect, namely calcite, the separation of the calcite fills the crack, the calcium bicarbonate is cemented and mutually built into a net-shaped structure to form a whole with the original building structure, so that the strength of the fracture surface is recovered to a certain extent, the compactness of the concrete can be effectively improved, and the crack repair is completed;
(7) after the calcium bicarbonate solution is decomposed and reacted in the cracks, a certain time is needed for calcium carbonate precipitation, crystallization and attachment, and the solution and the sediments can quickly pass through the concrete cracks under the action of gravity, so that continuous grouting can be adopted for 30min, the concrete cracks are stopped for 30min, grouting is carried out for 30min again, circulation is carried out for 2-4 times, a calcium carbonate crystal layer is formed on the inner walls of the cracks through gradual deposition, and the crack plugging effect is better.
The calcium bicarbonate solution is prepared as a concrete microcrack repairing agent based on the carbonation reaction principle of calcium-based industrial solid waste materials, has high fluidity, can be injected into a fine crack in the depth of concrete by using an injection gun, heats the peripheral area of the concrete crack, enables the solution to decompose and react to generate calcium carbonate crystals (calcite) with a cementing effect, fills gaps, builds up a net-shaped structure, gradually forms an integral structure with the original concrete, and finishes crack repair.
Preferably, in the step (2), the calcium-based industrial solid material comprises, by mass, 20-30 parts of fly ash, 15-30 parts of carbide slag, 15-20 parts of steel slag, 15-20 parts of desulfurized gypsum and 10-25 parts of granulated blast furnace slag;
the mass ratio of the calcium-based industrial solid material to the deionized water is (0.4-0.6): 1.
The present invention is not described in detail, and the prior art can be adopted.
The invention has the beneficial effects that:
(1) the invention strengthens the scientific and technological innovation of waste resource, realizes the carbon emission reduction and the reutilization of industrial solid wastes and industrial waste gas, and can realize the permanent storage of carbon dioxide because carbonate is the most stable carbon fixing mode. Calcium-based industrial solid materials such as carbide slag, fly ash and steel slag are mostly close to the emission source of carbon dioxide, and many industrial solid wastes are typical fine crystals, have high reaction specific surface area, almost do not need pretreatment, have low production cost, are green and environment-friendly, and have simple preparation process flow.
(2) The repairing agent prepared by the invention has high fluidity, can penetrate into fine cracks in the deep part of a concrete structure, does not need to treat the areas around the cracks before grouting, does not damage the original structure, and has wide application range.
(3) Compared with self-repairing materials and other grouting technologies, the calcium bicarbonate solution adopted by the invention is decomposed, precipitated and crystallized to generate calcite crystals, so that the calcium bicarbonate solution has a cementing effect, can quickly finish crack filling and generate strength, and has short repairing time; can be quickly integrated with the original structure into a whole, and has stable long-term effect; the repairing agent can enter capillary pores, and the compactness and strength of the concrete are further improved after mineralization reaction.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic view of a reservoir according to the present invention;
FIG. 3 is a schematic diagram of an infrared heating panel according to an embodiment;
FIG. 4 is a schematic view of a position of a retaining ring in an IR heating plate according to one embodiment;
in the figure, 1-a carbon dioxide gas tank, 2-a gas flow rate monitor, 3-a water injection port, 4-a control screen, 5-a slurry preparation box, 6-a solid material placing port, 7-a mobile cart, 8-a liquid outlet, 9-a water pump, 10-a pulley, 11-a liquid flow rate sensor, 12-a conveying hose, 13-a liquid injection gun, 14-a heating plate, 15-a pH monitor, 16-a calcium-based industrial solid material, 17-a temperature controller, 18-a stirring device, 19-a liquid storage tank, 20-a fixing ring, 21-a liquid outlet end, 22-carbon fiber conductive paper, 23-an electrode, 24-a substrate layer and 25-an electrode node.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific examples, but not limited thereto, and the present invention is not described in detail and is in accordance with the conventional techniques in the art.
Example 1:
a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is shown in figures 1-4 and comprises a repairing agent preparation device, a repairing agent conveying device and a grouting repairing device;
the repairing agent preparation device comprises a carbon dioxide gas tank 1 and a slurry preparation tank 5, wherein a liquid storage tank 19 is arranged in the slurry preparation tank 5, a water injection port 3 is arranged above the liquid storage tank 19, a mixed liquid of calcium-based industrial solid materials 16 and deionized water which are prepared according to a proportion is arranged in the liquid storage tank 19, industrial waste gas containing carbon dioxide is arranged in the carbon dioxide gas tank 1, and the carbon dioxide gas tank 1 is connected to the liquid storage tank 19 through a pipeline;
the repairing agent conveying device comprises a water pump 9 and a conveying hose 12, the grouting repairing device comprises a liquid injection gun 13, the water pump 9 conveys the solution in a liquid storage tank 19 to the liquid injection gun 13 through the conveying hose 12, and a heating plate 14 is arranged on the liquid injection gun and used for heating the area around the concrete structure crack.
Example 2:
the concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is characterized in that a stirring device 18, a pH monitor 15 and a temperature controller 17 are arranged on a liquid storage tank 19, a gas flow rate monitor 2 is arranged on a pipeline between a carbon dioxide gas tank 1 and the liquid storage tank 19 to monitor and regulate gas flow in real time, and a liquid flow rate sensor 11 is arranged on a conveying hose 12 to monitor the flow rate of a repairing agent in real time, as described in embodiment 1.
The repairing agent preparation device and the water pump are both arranged on the movable cart 7, and the pulley 10 is arranged at the bottom of the movable cart 7, so that the device is convenient to move;
the slurry preparation box is provided with a control screen 4, the control screen 4 is in signal connection with the pH monitor 15 and the temperature controller 17, the solution reaction temperature and the pH value change can be displayed in real time through the control screen 4, the solution reaction temperature can be regulated and controlled, and the temperature stability is guaranteed.
The slurry preparation box is provided with a solid material placing opening 6, a new calcium-based industrial solid material can be replaced through the solid material placing opening 6, a liquid outlet 8 is arranged on one side of the slurry preparation box, and a conveying hose 12 is connected with the liquid outlet 8.
Example 3:
a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is different from the concrete microcrack grouting repairing device in that, as shown in figures 3 and 4, a heating plate 14 is an infrared heating plate, a through hole is arranged in the middle of the infrared heating plate, and a fixing ring 20 is arranged in the through hole and used for fixing the infrared heating plate at a proper position of a liquid outlet end 21 of a liquid injection gun. Generally, the liquid outlet end 21 of the liquid injection gun extends into the crack for consistent length, if the depth of the crack is too large or too small, the position of the infrared heating plate needs to be adjusted to enable the infrared heating plate to be tightly attached to the surface of the concrete, after the liquid outlet end extends into the crack, the fixing ring 20 can be loosened, the heating plate is adjusted to be tightly attached to the surface of the concrete, and the fixing ring 20 is screwed up to fix the heating plate.
Furthermore, the heating layer of the infrared heating plate is composed of a layer of carbon fiber conductive paper 22, an electrode 23 is adhered to the carbon fiber conductive paper 22 and is arranged between two substrate layers 24, the carbon fiber conductive paper is adhered through an adhesive and is fused into a whole through hot pressing, 25 is an electrode node, the size of the infrared heating plate is about 60cm x 90cm, the thickness of the infrared heating plate is 1-2 cm (the size can be adjusted according to engineering requirements), the temperature of the heating surface can reach 120 ℃, the infrared heating plate is a non-metallic planar resistor body, electric energy is directly converted into radiant heat after being electrified, the whole surface of the infrared heating plate is uniformly radiated, the temperature consistency is good, the heating area is large, the temperature rise speed is high, the penetrating power is high, and the accurate control of the heating temperature can be realized.
Example 4:
a working method of a concrete micro-crack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas comprises the following steps:
(1) moving the device to a construction area;
(2) placing calcium-based industrial solid materials and deionized water in a specified ratio in a liquid storage tank 19, starting a stirring device 18, wherein the stirring speed is 900r/min, when the pH value of a solution in the liquid storage tank is stable, introducing industrial waste gas containing carbon dioxide, the gas flow rate is 0.50L/min, and the calcium-based industrial solid materials are subjected to carbonation reaction, wherein the reaction process is as follows:
CO2dissolved in water to form weakly acidic CO3 2-Ionization of CO3 2-With HCO3 -Under the action of alkalinity, HCO3 -With OH-Rapidly react to form H2O and CO3 2-，CO3 2-And Ca2+Reaction to form CaCO insoluble in water3And HCO3 -And Ca2+The chemical reaction is carried out to generate soluble salt, and the soluble salt enters the solution to finally prepare a calcium bicarbonate solution as a repairing agent;
(3) the temperature and the pH value in the liquid storage tank are monitored in real time by adopting a temperature controller 17 and a pH monitor 15, the temperature is controlled to be 4-6 ℃, a calcium bicarbonate solution is beneficial to leaching calcium ions at 4-6 ℃ in the preparation process, the carbon sequestration efficiency can be effectively improved, when the pH value is reduced to 5.8-6.2, the solution can be judged to be weakly acidic, excessive carbon dioxide is introduced, the introduction of carbon dioxide gas can be stopped, a solid material placing port 6 is opened, and the calcium-based industrial solid material in the slurry preparation tank is replaced;
(4) after the repairing agent is prepared, opening a liquid outlet 8 and a water pump 9, pumping the calcium bicarbonate solution into a liquid injection gun by the water pump 9 through a conveying hose 12, and monitoring the flow rate change of the calcium bicarbonate solution in real time by a liquid flow rate sensor 11 on the conveying hose, wherein the flow rate is 0.5-0.8 m/s;
(5) a heating plate is arranged at the pipe head of the liquid injection gun, a liquid outlet of the liquid injection gun is fixed at the periphery of the crack, the repairing agent is slowly injected into the crack, and when a small amount of the repairing agent flows out from the position close to the liquid injection port, the injection is immediately stopped;
(6) when the repairing agent is injected into the crack, the heating plate 14 is started, the area around the crack of the concrete structure is heated, the heating temperature is set to be 60-65 ℃, the solubility of the calcium bicarbonate solution is lowest at the temperature, calcite with better stability is most easily generated, the degradation of the concrete with the original structure can be caused due to overhigh temperature, the calcium bicarbonate solution is decomposed, deposited and crystallized into calcium carbonate crystals with cementing effect, namely calcite, the cracks are filled by the precipitation of the calcite, the calcium bicarbonate solution is cemented and mutually built into a net-shaped structure and forms a whole with the original building structure, so that the strength of the fracture surface is recovered to a certain degree, the compactness of the concrete can be effectively improved, and the crack repairing is completed;
(7) after the calcium bicarbonate solution is decomposed and reacted in the cracks, a certain time is needed for calcium carbonate precipitation, crystallization and attachment, and the solution and the sediments can quickly pass through the concrete cracks under the action of gravity, so that continuous grouting can be adopted for 30min, the concrete cracks are stopped for 30min, grouting is carried out for 30min again, circulation is carried out for 2-4 times, a calcium carbonate crystal layer is formed on the inner walls of the cracks through gradual deposition, and the crack plugging effect is better.
Example 5:
a working method of a concrete microcrack grouting repair device based on industrial calcium-based solid wastes and carbon dioxide tail gas, as described in example 4, except that in step (2), the calcium-based industrial solid material comprises 20 parts of fly ash, 30 parts of carbide slag, 15 parts of steel slag, 15 parts of desulfurized gypsum and 20 parts of granulated blast furnace slag by mass;
the mass ratio of the calcium-based industrial solid material to the deionized water is 0.4:1, namely 250 parts of deionized water;
wherein the components of the fly ash, the carbide slag, the steel slag, the desulfurized gypsum and the granulated blast furnace slag are shown in the following table 1 in parts by mass;
table 1: main ingredient table (parts by mass) of calcium-based industrial solid material
Example 6:
the working method of the concrete microcrack grouting repairing device based on the industrial calcium-based solid waste and the carbon dioxide tail gas is as described in example 5, except that the mass ratio of the calcium-based industrial solid material to deionized water is 0.5:1, namely 200 parts of deionized water.
Example 7:
the working method of the concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is as described in example 5, except that the mass ratio of the calcium-based industrial solid material to deionized water is 0.6:1, namely 167 parts of deionized water.
Example 8:
a working method of a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is disclosed in example 5, except that the calcium-based industrial solid material comprises 30 parts of fly ash, 20 parts of carbide slag, 15 parts of steel slag, 15 parts of desulfurized gypsum and 20 parts of granulated blast furnace slag by weight;
the mass ratio of the calcium-based industrial solid material to the deionized water is 0.5:1, namely 200 parts of deionized water.
Example 9:
a working method of a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas, as described in example 5, except that the calcium-based industrial solid material comprises 20 parts of fly ash, 30 parts of carbide slag, 20 parts of steel slag, 20 parts of desulfurized gypsum and 10 parts of granulated blast furnace slag by mass;
the mass ratio of the calcium-based industrial solid material to the deionized water is 0.5:1, namely 200 parts of deionized water.
Example 10:
a working method of a concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas, as described in example 5, except that the calcium-based industrial solid material comprises 30 parts of fly ash, 15 parts of carbide slag, 15 parts of steel slag, 15 parts of desulfurized gypsum and 25 parts of granulated blast furnace slag by mass;
the mass ratio of the calcium-based industrial solid material to the deionized water is 0.5:1, namely 200 parts of deionized water.
And (3) performance testing:
curing the same 7 concrete test pieces to 28d, respectively adopting a splitting method to enable the concrete to generate cracks, winding two layers of adhesive tapes on the test pieces in advance to prevent the test pieces from being completely broken in the splitting and pulling process, and simultaneously preventing the cracks from being too large;
in order to simulate concrete cracks in a real environment, a treated test piece is placed on a compression testing machine, the loading speed (0.2-0.4 kN/s) is properly controlled, so that the test piece cracks, the crack shapes and the cracks formed naturally are closer to each other when the crack widths are controlled to be smaller than 0.30mm, and although the crack widths and the trends of 7 test pieces cannot be completely guaranteed to be consistent, the error is small, and the test conclusion is not greatly influenced.
6 test pieces were repaired by using the repairing agents prepared from the calcium-based industrial solid materials of examples 5 to 10, and the 7 th test piece was used as a reference group (i.e., no crack repair was performed), and then performance tests were performed on the 7 test pieces for comparison.
Breaking strength: the test is carried out according to GB/T50081-2002 ordinary concrete mechanical property test method, the flexural strength recovery rate is used as the standard for evaluating the grouting repair technology to improve the mechanical property of the concrete member, and the concrete flexural strength recovery rate is calculated according to the formula (1):
in the formula, fbShowing bending strengthDegree recovery,%; f. of0The breaking strength after grouting is expressed in MPa; f represents the flexural strength of the standard test piece in MPa.
Water permeability resistance: the concrete water penetration resistance test is carried out according to a water penetration height method in GB/T50082-2009 test method for testing the long-term performance and the durability of common concrete, and the water penetration height of a test piece is calculated according to the formula (2):
in the formula: h isjRepresenting the water seepage height (mm) of the ith test piece at the jth measuring point;
the average water seepage height (mm) of the ith test piece is represented, and the average value of the water seepage heights of the 10 test points is taken as the measured value of the water seepage height of the test piece.
Freezing resistance: the concrete durability test is carried out in a freeze-thaw cycle test according to the test method standard for the long-term performance and the durability of common concrete (GB/T50082-2009), and in the freeze-thaw cycle test, the frost resistance of the test block can be judged according to the mass loss rate of the test block after multiple cycles.
The mass loss rate of a single test piece was calculated as follows:
in the formula,. DELTA.WniThe mass loss rate (%) of the ith concrete sample after N times of freeze-thaw cycles is accurate to 0.01; w is a group of0iThe mass (g) of the ith concrete sample before the freeze-thaw cycle test; w is a group ofniThe mass (g) of the ith concrete sample after N times of freeze-thaw cycles.
The average mass loss rate for a set of test pieces should be calculated as follows:
in the formula,. DELTA.WnThe average mass loss rate (%) of a group of concrete samples after N times of freeze-thaw cycles is accurate to 0.1.
Width of the crack: measured according to the concrete crack width and depth measuring instrument calibration Specification (JJF 1334-2012).
The respective properties are shown in table 2.
Table 2: test result of grouting repair performance of cracked concrete
According to the test results in the table 2, the concrete test piece after crack repair is completed by adopting the micro-crack grouting repair technology provided by the invention, the flexural strength is increased to a certain extent compared with that before grouting; the water seepage height is obviously reduced compared with that of a reference test block; after 200 times of freeze-thaw cycle tests, the mass loss rates of the concrete samples of examples 5-10 are respectively reduced by 55.7%, 42.3%, 33.5%, 52.6%, 37.5% and 40.1% compared with the mass loss rate of the reference group; the width of the crack after grouting repair is basically zero, which proves that the calcium bicarbonate solution decomposes, precipitates and crystallizes to generate calcite which can fill the crack, so that the strength of the fracture surface is recovered to a certain extent, and the concrete structure is more compact.
The method has the advantages that the method adopts the splitting method to prefabricate the micro cracks, the crack width is small, certain measurement and test errors exist, the complete consistency cannot be ensured, the difference of the crack width is small, and the test conclusion is not greatly influenced. Compared with a reference group, the repaired fracture repair material has great changes in breaking strength, water seepage height, mass loss rate and width change, and can prove that the repair material has a repair effect on the fracture after being injected and the performance of a concrete test piece is improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas is characterized by comprising a repairing agent preparation device, a repairing agent conveying device and a grouting repairing device;
the repairing agent preparation device comprises a carbon dioxide gas tank and a slurry preparation box, wherein a liquid storage pool is arranged in the slurry preparation box, a water injection port is arranged above the liquid storage pool, mixed liquid of calcium-based industrial solid materials and deionized water is prepared in the liquid storage pool in proportion, industrial waste gas containing carbon dioxide is contained in the carbon dioxide gas tank, and the carbon dioxide gas tank is connected to the liquid storage pool through a pipeline;
the repairing agent conveying device comprises a water pump and a conveying hose, the grouting repairing device comprises a liquid injection gun, the water pump conveys the solution in the liquid storage tank to the liquid injection gun through the conveying hose, and a heating plate is arranged on the liquid injection gun and used for heating the area around the concrete structure crack.
2. The apparatus for grouting and repairing concrete microcracks based on industrial calcium-based solid waste and carbon dioxide tail gas according to claim 1, wherein the liquid reservoir is provided with a stirring device, a pH monitor and a temperature controller, the carbon dioxide gas tank and the liquid reservoir are provided with a gas flow rate monitor, and the delivery hose is provided with a liquid flow rate sensor.
3. The concrete microcrack grouting repair device based on industrial calcium-based solid waste and carbon dioxide tail gas of claim 1, wherein the heating plate is an infrared heating plate, a through hole is arranged in the middle of the infrared heating plate, and a fixing ring is arranged in the through hole and used for fixing the infrared heating plate at a proper position at the liquid outlet end of the liquid injection gun.
4. The industrial calcium-based solid waste and carbon dioxide tail gas-based concrete microfracture grouting repair device as claimed in claim 2, wherein the repair agent preparation device and the water pump are both arranged on a mobile cart, and the bottom of the mobile cart is provided with a pulley;
preferably, the slurry preparation box is provided with a control screen, and the control screen is connected with the pH monitor and the temperature controller.
5. The industrial calcium-based solid waste and carbon dioxide tail gas-based concrete microfracture grouting repair device as claimed in claim 4, wherein a solid material placing port is arranged on the slurry preparation tank, a liquid outlet is arranged on one side of the slurry preparation tank, and a conveying hose is connected with the liquid outlet.
6. The working method of the concrete microcrack grouting repair device based on industrial calcium-based solid waste and carbon dioxide tail gas as claimed in claim 2 is characterized by comprising the following steps:
(1) moving the device to a construction area;
(2) placing calcium-based industrial solid materials and deionized water in a specified ratio in a liquid storage tank, starting a stirring device, wherein the stirring speed is 800 r/min-1000 r/min, when the pH value of a solution in the liquid storage tank is stable, introducing industrial waste gas containing carbon dioxide, the gas flow rate is 0.40L/min-0.60L/min, and the calcium-based industrial solid materials are subjected to carbonation reaction, wherein the reaction process is as follows:
CO2dissolved in water to form weakly acidic CO3 2-Ionization of CO3 2-With HCO3 -Under the action of alkalinity, HCO3 -With OH-Rapidly react to form H2O and CO3 2-，CO3 2-And Ca2+Reaction to form CaCO insoluble in water3And HCO3 -And Ca2+The chemical reaction is carried out to generate soluble salt, and the soluble salt enters the solution to finally prepare a calcium bicarbonate solution as a repairing agent;
(3) monitoring the temperature and the pH value in the liquid storage tank in real time by adopting a temperature controller and a pH monitor, controlling the temperature to be 4-6 ℃, judging that the solution is weakly acidic when the pH value is reduced to 5.8-6.2, introducing excessive carbon dioxide, stopping introducing carbon dioxide gas, opening a solid material placing opening, and replacing the calcium-based industrial solid material in the slurry preparation tank;
(4) after the repairing agent is prepared, opening a liquid outlet and a water pump, pumping the calcium bicarbonate solution into a liquid injection gun by the water pump through a conveying hose, and monitoring the flow speed change of the calcium bicarbonate solution in real time by a liquid flow speed sensor on the conveying hose, wherein the flow speed is 0.5-0.8 m/s;
(5) a heating plate is arranged at the pipe head of the liquid injection gun, a liquid outlet of the liquid injection gun is fixed at the periphery of the crack, the repairing agent is slowly injected into the crack, and when the repairing agent flows out from the position close to the liquid injection port, the injection is immediately stopped;
(6) when the repairing agent is injected into the crack, the heating plate is opened, the area around the crack of the concrete structure is heated, the heating temperature is set to be 60-65 ℃, the calcium bicarbonate solution is decomposed, deposited and crystallized into calcium carbonate crystals with a cementing effect, namely calcite, the crack is filled with the precipitated calcite, and the calcium carbonate crystals are cemented and mutually built into a net structure to form a whole with the original building structure;
(7) and after the grouting is continued for 30min, stopping for 30min, and grouting for 30min again, so that circulation is performed for 2-4 times, and a calcium carbonate crystal layer is gradually deposited on the inner wall of the crack.
7. The working method of the concrete microcrack grouting repairing device based on industrial calcium-based solid waste and carbon dioxide tail gas in the step (2), wherein the calcium-based industrial solid material comprises 20-30 parts by mass of fly ash, 15-30 parts by mass of carbide slag, 15-20 parts by mass of steel slag, 15-20 parts by mass of desulfurized gypsum and 10-25 parts by mass of granulated blast furnace slag;
the mass ratio of the calcium-based industrial solid material to the deionized water is (0.4-0.6): 1.
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