Multifunctional curing pad for sealing concrete curing cracks and use method thereof

Abstract

A multifunctional curing mat for plugging concrete curing cracks and a method for using the same, the curing mat comprising a water-retaining layer, a urease layer, a retarding layer and a waterproof frame; the water-retaining layer, the urease layer and the retarding layer are sequentially arranged on the upper surface of the concrete curing roof from top to bottom, a geotextile is arranged between the urease layer and the retarding layer, a geotextile is arranged between the water-retaining layer and the urease layer, a geotextile is arranged on the upper surface of the water-retaining layer, the waterproof frame is connected to the upper surface of the concrete curing roof and wrapped around the outer edge of the whole composed of the water-retaining layer, the urease layer, the retarding layer and the geotextile, the urease layer is filled with a urease solution, and the retarding layer is filled with a retarder. The present invention utilizes the principle of microbial induced calcium carbonate to combine carbonate ions generated in the urease solution with calcium ions in the calcium chloride solution to generate gelled crystals to timely plug and fill the cracks and pores generated during the curing of the concrete structure, thereby effectively preventing the concrete structure from cracking.

Description

Technical Field

[0001] The invention relates to the technical field of concrete curing, and in particular to a multifunctional curing pad for sealing concrete curing cracks and a use method thereof. Background Art

[0002] Concrete structure is an indispensable and important part of modern engineering. The maintenance of concrete structure is crucial to ensure the quality and performance of concrete, which can promote hydration reaction, reduce cracks and improve durability. However, in some areas with special geological conditions, the maintenance of concrete structure faces some special technical difficulties. For example, in areas with relatively dry geological environment and large temperature difference between day and night, the concrete structure cannot guarantee sufficient moisture during the maintenance period, and the concrete cracking problem cannot be remedied in time and effectively, resulting in the destruction of the concrete skeleton structure, seriously reducing the bearing capacity and shear resistance of the concrete structure, causing structural deformation or even collapse, thus causing serious safety problems and huge economic losses. Therefore, the safety and stability of concrete structures should be taken very seriously. At present, the wet curing, steam curing and curing liquid curing commonly used on the market can only guarantee the moisture requirements during the concrete curing period to a certain extent, and cannot effectively suppress or fill and remedy existing or future cracks. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects and problems of poor curing effect in the prior art, and to provide a multifunctional curing pad with good curing effect for sealing concrete curing cracks and a method of using the same.

[0004] To achieve the above objectives, the technical solution of the present invention is: a multifunctional curing mat for sealing concrete curing cracks, comprising a water-retaining layer, a urease layer, a retarding layer and a waterproof frame; the water-retaining layer, the urease layer and the retarding layer are arranged in sequence from top to bottom on the upper surface of the concrete curing roof, a geotextile is arranged between the urease layer and the retarding layer, a geotextile is arranged between the water-retaining layer and the urease layer, a geotextile is arranged on the upper surface of the water-retaining layer, the waterproof frame is connected to the upper surface of the concrete curing roof and wrapped around the outer edge of the whole composed of the water-retaining layer, the urease layer is filled with urease solution, and the retarding layer is filled with retarder.

[0005] The waterproof frame includes four waterproof plastic shells and four connectors. The four waterproof plastic shells are respectively abutted against the four sides of the whole composed of the water-retaining layer, the urease layer, the retarding layer and the geotextile. Both ends of the four waterproof plastic shells are provided with sockets. Both ends of the four connectors are connected with plugs. The two plugs of the connectors are respectively matched and connected with the sockets of two adjacent waterproof plastic shells.

[0006] The lower surfaces of the connector and the waterproof plastic shell are both connected with a degumming channel and an adhesive layer, the degumming channel is located on the outside of the adhesive layer, the degumming channel is filled with a degumming agent, the adhesive layer is filled with glue, the lower surfaces of the degumming channel and the adhesive layer are provided with holes, the degumming channel and the adhesive layer are provided with switch components, the switch components are used to realize the opening and closing of the holes, and an external switch for controlling the operation of the switch component is provided on the outside of the connector.

[0007] The waterproof plastic shell is filled with Naki bentonite and a geotextile is arranged on the inner surface.

[0008] The lower surface of the adhesive layer is paved with a tearable plastic film.

[0009] The connector includes a first connection layer, a second connection layer and a debonding layer, the debonding layer is connected to the upper side of the adhesive layer, the second connection layer is connected to the upper side of the debonding layer and the plugs are connected to both ends, the first connection layer is connected to the upper side of the debonding channel and connected to the outer sides of the second connection layer and the debonding layer, the first connection layer and the second connection layer are filled with nano-bentonite; the debonding layer is filled with a debonding agent, holes are opened on the lower surface of the debonding layer, and a switch component is arranged in the debonding layer.

[0010] A hole is formed on one side of the debonding channel close to the adhesive layer.

[0011] A method for using a multifunctional curing mat for sealing concrete curing cracks, the method comprising the following steps:

[0012] Step 1: clean the upper surface of the concrete curing roof, and install an acoustic sensor on the upper surface of the concrete curing roof to test and obtain the location, number and size of cracks in the concrete curing roof;

[0013] Step 2: Determine the corresponding concentrations of urease solution and calcium chloride-urea solution according to the number and size of cracks in the concrete curing roof;

[0014] Step 3, filling the urease layer and the retarding layer with urease solution and retarder and preparing pure water;

[0015] Step 4: Arrange the retarding layer, geotextile, urease layer, geotextile, water-retaining layer, and geotextile from bottom to top in close contact with the upper surface of the concrete curing roof;

[0016] Step 5: Install the waterproof frame on the upper surface of the concrete curing roof and tightly wrap the outer edge of the whole composed of the water retention layer, urease layer, retarding layer and geotextile;

[0017] Step 6: Evenly sprinkle pure water on the surface of the top geotextile. When the set sprinkling time is reached, evenly sprinkle calcium chloride-urea solution on the surface of the top geotextile. At this time, the calcium chloride-urea solution and the urease solution react inside the concrete of the concrete curing roof to generate crystals and fix and fill the curing cracks in the concrete.

[0018] Step 7. Repeat step 6. When the calcium chloride-urea solution and pure water overflow from the surface of the top geotextile, stop sprinkling the pure water and calcium chloride-urea solution, and remove the multifunctional curing mat from the upper surface of the concrete curing roof. At this time, the curing cracks in the concrete are filled.

[0019] The specific steps for obtaining the position, number and size of the cracks in the concrete curing roof in step 1 are:

[0020] Install multiple acoustic sensors on the upper surface of the concrete curing roof, record the baseline acoustic emission activity under no load, determine the noise threshold, then add mechanical load to cause concrete stress changes to form an acoustic emission source, and calculate the coordinates of the acoustic emission source according to the formula, which is the location of the crack;

[0021] Repeat the above operation until the positions of all cracks are determined, and determine the size of the cracks through various data of the sound waves collected by the data acquisition system.

[0022] The specific steps for calculating the coordinates of the acoustic emission source are:

[0023] Select any three acoustic sensors and set them as the first sensor, the second sensor, and the third sensor, where:

[0024] ;

[0025] ;

[0026] ;

[0027] ;

[0028] in, , , are the times when the first sensor, the second sensor, and the third sensor receive the acoustic emission signal, respectively. , are the horizontal and vertical coordinates of the initial acoustic emission source, , are the horizontal and vertical coordinates of the first sensor, , are the horizontal and vertical coordinates of the second sensor, , are the horizontal and vertical coordinates of the third sensor, is the propagation speed of sound waves in concrete material;

[0029] According to the horizontal and vertical coordinates of the initial acoustic emission source, reselect the three acoustic sensors that are closest to the horizontal and vertical coordinates of the initial acoustic emission source, and recalculate the horizontal coordinate of the acoustic emission source according to the above formula and the vertical coordinate .

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the multifunctional curing mat for plugging concrete curing cracks and the use method thereof, the carbonate ions produced in the urease solution are combined with the calcium ions in the calcium chloride solution to generate gelled crystals by utilizing the principle of microbial induced calcium carbonate precipitation, so that the cracks and apertures produced during the curing of the concrete structure are timely plugged and filled, thereby effectively preventing the concrete structure from cracking; by setting a retarding layer, the self-solidification speed and crack formation speed of the concrete curing roof can be slowed down, and time is gained for the crystallization process of the urease solution combined with the free calcium ions on the surface of the crack, so that the cracks are filled and plugged in time at the early stage of formation; waterproofing is performed by a waterproof frame, so that the calcium ions produced by the reaction during the concrete curing can be collected, and the calcium ions can be inhibited from being discharged with water outflow, thereby avoiding the loss of concrete structure strength. Therefore, the curing effect of the present invention is good.

[0032] 2. In the multifunctional curing mat for sealing concrete curing cracks and the use method thereof, the waterproof frame is connected in the form of a waterproof plastic shell and a connector assembly, and the plug and the jack cooperate with each other, so as to facilitate assembly and disassembly; by setting the Na-based bentonite, the Na-based bentonite absorbs water and expands when in contact with water, forming a dense water-retaining outer layer inside the waterproof plastic shell, thereby wrapping the water-retaining layer, the urease layer and the slow-setting layer. Therefore, the present invention has good curing effect and is easy to use.

[0033] 3. In the multifunctional curing pad for sealing concrete curing cracks and the use method thereof of the present invention, a degumming channel and an adhesive layer are provided, and the glue in the adhesive layer can be adhered and fixed to the concrete curing roof, thereby ensuring the stability of the structure. The degumming channel and the degumming layer can remove the glue between the outside of the curing pad and the concrete curing roof, and the glue in the degumming layer can also remove the glue in the adhesive layer inside the curing pad. By removing the glue both inside and outside, a better degumming effect can be achieved; thereby facilitating disassembly; and by using a tearable plastic film, the adhesive layer can be prevented from being exposed, resulting in poor viscosity. Therefore, the present invention has a stable structure and is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic diagram of the use state of the present invention.

[0035] Figure 2 It is a schematic diagram of the unfolded structure of a multifunctional curing pad for sealing concrete curing cracks in the present invention.

[0036] Figure 3 It is a structural schematic diagram of the waterproof frame, adhesive layer, debonding channel and geotextile in the present invention.

[0037] Figure 4 It is a structural schematic diagram of the connector, plug and peripheral switch in the present invention.

[0038] Figure 5 It is a structural schematic diagram of the connector in the present invention.

[0039] Figure 6 It is a structural schematic diagram of the bonding layer and the debonding channel in the present invention.

[0040] Figure 7 It is a structural schematic diagram of the waterproof plastic shell in the present invention.

[0041] In the figure: concrete curing roof 1, water retention layer 2, urease layer 3, retarding layer 4, bonding layer 5, degumming channel 6, waterproof frame 7, waterproof plastic shell 8, connector 9, first connecting layer 91, second connecting layer 92, degumming layer 93, geotextile 10, hole 11, external switch 12, plug 13, socket 14, tearable plastic film 15. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Embodiment 1:

[0044] See also Figures 1 to 7 A multifunctional curing mat for sealing concrete curing cracks, comprising a water-retaining layer 2, a urease layer 3, a retarding layer 4 and a waterproof frame 7; the water-retaining layer 2, the urease layer 3, and the retarding layer 4 are arranged in sequence from top to bottom on the upper surface of a concrete curing roof 1, a geotextile 10 is arranged between the urease layer 3 and the retarding layer 4, a geotextile 10 is arranged between the water-retaining layer 2 and the urease layer 3, a geotextile 10 is arranged on the upper surface of the water-retaining layer 2, the waterproof frame 7 is connected to the upper surface of the concrete curing roof 1 and wrapped around the outer edge of the whole composed of the water-retaining layer 2, the urease layer 3, the retarding layer 4, and the geotextile 10, the urease layer 3 is filled with a urease solution, the retarding layer 4 is filled with a retarder, and the area of ​​the geotextile 10 is larger than the area of ​​the water-retaining layer 2, the urease layer 3 and the retarding layer 4.

[0045] A method for using a multifunctional curing mat for sealing concrete curing cracks, the method comprising the following steps:

[0046] Step 1: clean the upper surface of the concrete curing roof 1, and install an acoustic sensor on the upper surface of the concrete curing roof 1 to test and obtain the position, number and size of the cracks in the concrete curing roof 1;

[0047] Step 2: Determine the corresponding concentrations of urease solution and calcium chloride-urea solution according to the number and size of cracks in the concrete curing roof 1;

[0048] Step 3, filling the urease layer 3 and the retarding layer 4 with urease solution and retarder and preparing pure water;

[0049] Step 4: Arrange the retarding layer 4, the geotextile 10, the urease layer 3, the geotextile 10, the water-retaining layer 2, and the geotextile 10 from bottom to top in close contact with the upper surface of the concrete curing roof 1;

[0050] Step 5: Install the waterproof frame 7 on the upper surface of the concrete curing roof 1 and tightly wrap the outer edge of the whole composed of the water-retaining layer 2, the urease layer 3, the retarding layer 4 and the geotextile 10;

[0051] Step 6: Evenly sprinkle pure water on the surface of the top geotextile 10. When the set sprinkling time is reached, evenly sprinkle calcium chloride-urea solution on the surface of the top geotextile 10. At this time, the calcium chloride-urea solution and the urease solution react inside the concrete of the concrete curing roof 1 to generate crystals and fix and fill the curing cracks in the concrete.

[0052] Step 7: Repeat step 6. When the calcium chloride-urea solution and pure water overflow from the surface of the top geotextile 10, stop sprinkling the pure water and calcium chloride-urea solution, and remove the multifunctional curing mat from the upper surface of the concrete curing roof 1. At this time, the curing cracks in the concrete are filled.

[0053] The specific steps for obtaining the position, number and size of the cracks in the concrete curing roof 1 in step 1 are:

[0054] A plurality of acoustic sensors are installed on the upper surface of the concrete curing roof 1, and the baseline acoustic emission activity is recorded under no load to determine the noise threshold. Then, a mechanical load is applied to cause the concrete stress change to form an acoustic emission source. The coordinates of the acoustic emission source are calculated according to the formula, and the coordinates are the location of the crack.

[0055] Repeat the above operation until the positions of all cracks are determined, and determine the size of the cracks through various data of the sound waves collected by the data acquisition system.

[0056] The specific steps for calculating the coordinates of the acoustic emission source are:

[0057] Select any three acoustic sensors and set them as the first sensor, the second sensor, and the third sensor, where:

[0058] ;

[0059] ;

[0060] ;

[0061] ;

[0062] in, , , are the times when the first sensor, the second sensor, and the third sensor receive the acoustic emission signal, respectively. , are the horizontal and vertical coordinates of the initial acoustic emission source, , are the horizontal and vertical coordinates of the first sensor, , are the horizontal and vertical coordinates of the second sensor, , are the horizontal and vertical coordinates of the third sensor, is the propagation speed of sound waves in concrete material;

[0063] According to the horizontal and vertical coordinates of the initial acoustic emission source, reselect the three acoustic sensors that are closest to the horizontal and vertical coordinates of the initial acoustic emission source, and recalculate the horizontal coordinate of the acoustic emission source according to the above formula and the vertical coordinate .

[0064] In this embodiment, after the curing cracks in the concrete are filled, the generation of calcium carbonate in the cracks is confirmed by using SEM technology, and at the same time, the air pressure is gradually increased to a set value at the pores initially reserved in the concrete, and the initial infiltration flow rate is recorded; the pressure is maintained for a certain period of time, and the change in the infiltration rate is monitored; the infiltration flow rate before and after plugging is compared, and if the flow rate drops significantly, it indicates that the plugging effect is good; if the infiltration flow rate after plugging is close to zero, it is considered that the air tightness requirement is met;

[0065] In step six, the calcium chloride-urea solution is sprinkled in a concentration gradient manner, and at the same time, urease solutions of different concentrations are wrapped in turn by different thermosensitive plastic films and placed in the urease layer 3. At the initial stage of sprinkling, the concentration of the calcium chloride-urea solution is low. When passing through the urease layer 3, it mixes with the low-concentration urease solution. The calcium ions react with water to generate heat to a certain extent. At this time, the temperature gradually increases, and the thermosensitive film outside the urease solution with a higher concentration melts, and the urease with a higher concentration is released. Then the temperature continues to rise, and the urease solution reacts with the calcium chloride-urea solution with a gradually increasing concentration in order from low to high concentration to generate crystals and fix them to fill the maintenance cracks in the concrete.

[0066] Embodiment 2:

[0067] The basic content is the same as that of Example 1, except that:

[0068] See also Figures 3 to 7 The waterproof frame 7 includes four waterproof plastic shells 8 and four connectors 9. The four waterproof plastic shells 8 are respectively abutted against the four sides of the whole composed of the water-retaining layer 2, the urease layer 3, the slow-setting layer 4, and the geotextile 10. Both ends of the four waterproof plastic shells 8 are provided with plugs 14. Both ends of the four connectors 9 are connected with plugs 13. The two plugs 13 of the connector 9 are respectively connected with the plugs 14 of the two adjacent waterproof plastic shells 8. The lower surfaces of the connector 9 and the waterproof plastic shell 8 are connected with the degumming channel 6 and The adhesive layer 5, the degumming channel 6 is located on the outside of the adhesive layer 5, the degumming channel 6 is filled with a degumming agent, the adhesive layer 5 is filled with glue, the degumming channel 6 and the adhesive layer 5 are provided with a switch component, the switch component is used to realize the opening and closing of the hole 11, the outside of the connector 9 is provided with an external switch 12 for controlling the operation of the switch component, the waterproof plastic shell 8 is filled with nano bentonite and the surface facing inward is provided with a geotextile 10, and the lower surface of the adhesive layer 5 is covered with a tearable plastic film 15.

[0069] In this embodiment, the degumming channel 6 and the adhesive layer 5 at the bottom of the waterproof plastic shell 8 are connected to the degumming channel 6 and the adhesive layer 5 of the connector 9 and maintain the same height. When the Naki bentonite comes into contact with the artificially sprinkled pure water, it absorbs water and expands, forming a dense water-retaining outer layer inside the waterproof plastic shell 8, and wrapping the three-layer sides of the water-retaining layer 2, the urease layer 3 and the retarding layer 4. The waterproof plastic shell 8 and the connector 9 are specifically arranged according to the four sides and four corners of the rectangle, and then the plug 13 is inserted into the jack 14 for assembly, and the tearable plastic film 15 laid on the surface of the adhesive layer 5 at the bottom of the waterproof plastic shell 8 and the connector 9 is torn off. After the waterproof plastic shell 8 and the connector 9 are installed, the assembly gap is sealed with glass glue to ensure that the pure water in the internal space does not leak out.

[0070] Embodiment 3:

[0071] The basic content is the same as that of Example 2, except that:

[0072] See also Figures 4 to 6 The connector 9 includes a first connection layer 91, a second connection layer 92 and a debonding layer 93, the debonding layer 93 is connected to the upper side of the adhesive layer 5, the second connection layer 92 is connected to the upper side of the debonding layer 93 and the plugs 13 are connected to both ends, the first connection layer 91 is connected to the upper side of the debonding channel 6 and to the outer sides of the second connection layer 92 and the debonding layer 93, the first connection layer 91 and the second connection layer 92 are filled with nano-bentonite; the debonding layer 93 is filled with a debonding agent, a hole 11 is provided on the lower surface of the debonding layer 93, a hole 11 is provided on the side of the debonding channel 6 close to the adhesive layer 5, and a switch component is arranged in the debonding layer 93.

[0073] In this embodiment, the switch assembly includes a movable plate and an electric cylinder. The movable plate is provided with connection holes corresponding to the number and position of the holes 11. The movable plate contacts the inner wall of the debonding layer 93, the inner wall of the debonding channel 6, and the inner wall of the bonding layer 5 respectively. One side of the movable plate is connected to the electric cylinder, and the movable plate is driven to move back and forth by the electric cylinder. The external switch 12 can be set as a conversion switch. The two contacts of the conversion switch are connected to the electric cylinder. The extension and retraction of the electric cylinder is controlled by the conversion switch. When the electric cylinder is extended, the connection holes on the movable plate coincide with the holes 11. At this time, the debonding agent and glue can flow out of the holes 11. When the electric cylinder is retracted, the connection holes on the movable plate are staggered with the holes 11. At this time, the debonding agent and glue cannot flow out of the holes 11. The opening and closing of the holes 11 are achieved by switching the conversion switch.

[0074] When the waterproof frame 7 is installed, the external switch 12 is controlled to open the holes 11 on the lower surface of the adhesive layer 5 to release the super glue, and the waterproof frame 7 is bonded and fixed to the concrete curing roof 1. When the curing pad needs to be removed, the external switch 12 is controlled to open the holes 11 on the No. 1 interface, the No. 2 interface, the No. 3 interface, and the No. 4 interface to release the degumming channel 8 and the degumming agent inside the degumming layer 93. The degumming agent automatically falls off after acting on the surface of the super glue and the glass glue.

Claims

1. A multifunctional curing mat for sealing concrete curing cracks, characterized by: The invention comprises a water-retaining layer (2), a urease layer (3), a retarding layer (4) and a waterproof frame (7); the water-retaining layer (2), the urease layer (3) and the retarding layer (4) are arranged in sequence from top to bottom on the upper surface of a concrete curing roof (1); a geotextile (10) is arranged between the urease layer (3) and the retarding layer (4); a geotextile (10) is arranged between the water-retaining layer (2) and the urease layer (3); a geotextile (10) is arranged on the upper surface of the water-retaining layer (2); the waterproof frame (7) is connected to the upper surface of the concrete curing roof (1) and wrapped around the outer edge of the whole composed of the water-retaining layer (2), the urease layer (3), the retarding layer (4) and the geotextile (10); the urease layer (3) is filled with a urease solution; and the retarding layer (4) is filled with a retarder; The waterproof frame (7) comprises four waterproof plastic shells (8) and four connectors (9). The four waterproof plastic shells (8) are respectively in contact with the four sides of the whole composed of the water-retaining layer (2), the urease layer (3), the slow-setting layer (4) and the geotextile (10). Both ends of the four waterproof plastic shells (8) are provided with plugs (14). Both ends of the four connectors (9) are connected with plugs (13). The two plugs (13) of the connectors (9) are respectively matched and connected with the plugs (14) of two adjacent waterproof plastic shells (8). The lower surfaces of the connector (9) and the waterproof plastic shell (8) are both connected with a degumming channel (6) and an adhesive layer (5); the degumming channel (6) is located on the outside of the adhesive layer (5); the degumming channel (6) is filled with a degumming agent; the adhesive layer (5) is filled with glue; holes (11) are provided on the lower surfaces of the degumming channel (6) and the adhesive layer (5); switch components are provided in the degumming channel (6) and the adhesive layer (5); the switch components are used to realize the opening and closing of the hole (11); and an external switch (12) for controlling the operation of the switch component is provided on the outside of the connector (9).

2. A multifunctional curing pad for sealing concrete curing cracks according to claim 1, characterized in that: The waterproof plastic shell (8) is filled with sodium-based bentonite and a geotextile (10) is provided on the inner surface.

3. The multifunctional curing pad for sealing concrete curing cracks according to claim 1, characterized in that: The lower surface of the adhesive layer (5) is covered with a tearable plastic film (15).

4. The multifunctional curing pad for sealing concrete curing cracks according to claim 1, characterized in that: The connector (9) comprises a first connection layer (91), a second connection layer (92) and a debonding layer (93); the debonding layer (93) is connected to the upper side of the adhesive layer (5); the second connection layer (92) is connected to the upper side of the debonding layer (93) and the plugs (13) are connected at both ends; the first connection layer (91) is connected to the upper side of the debonding channel (6) and to the outer sides of the second connection layer (92) and the debonding layer (93); the first connection layer (91) and the second connection layer (92) are filled with sodium bentonite; the debonding layer (93) is filled with a debonding agent; a hole (11) is provided on the lower surface of the debonding layer (93); and a switch component is arranged in the debonding layer (93).

5. The multifunctional curing pad for sealing concrete curing cracks according to claim 4, characterized in that: A hole (11) is provided on a side of the debonding channel (6) close to the adhesive layer (5).

6. A method for using the multifunctional curing mat for sealing concrete curing cracks according to claim 1, characterized in that: The method of use comprises the following steps: Step 1: clean the upper surface of the concrete curing roof (1), and install an acoustic sensor on the upper surface of the concrete curing roof (1) to test and obtain the number and size of cracks in the concrete curing roof (1); Step 2: Determine the corresponding concentrations of urease solution and calcium chloride-urea solution according to the number and size of cracks in the concrete curing roof (1); Step 3, filling the urease layer (3) and the retarding layer (4) with urease solution and retarder and preparing pure water; Step 4: Arrange the retarding layer (4), geotextile (10), urease layer (3), geotextile (10), water-retaining layer (2), and geotextile (10) in close contact with the upper surface of the concrete curing roof (1) from bottom to top in the order of: Step 5: Install the waterproof frame (7) on the upper surface of the concrete curing roof (1) and tightly wrap the outer edge of the whole composed of the water-retaining layer (2), the urease layer (3), the retarding layer (4) and the geotextile (10); Step 6: Evenly sprinkle pure water on the surface of the top geotextile (10). When the set sprinkling time is reached, evenly sprinkle calcium chloride-urea solution on the surface of the top geotextile (10). At this time, the calcium chloride-urea solution and the urease solution react inside the concrete of the concrete curing roof (1) to generate crystals and fix and fill the curing cracks in the concrete. Step 7, repeat step 6. When the calcium chloride-urea solution and purified water overflow from the surface of the top geotextile (10), stop sprinkling purified water and calcium chloride-urea solution, and remove the multifunctional curing mat from the upper surface of the concrete curing roof (1). At this time, the curing cracks in the concrete are filled.

7. The method for using the multifunctional curing mat for sealing concrete curing cracks according to claim 6, characterized in that: The specific steps for obtaining the number and size of cracks in the concrete curing roof (1) in step 1 are: A plurality of acoustic sensors are installed on the upper surface of the concrete curing roof (1), baseline acoustic emission activity is recorded under no load, a noise threshold is determined, and then a mechanical load is applied to cause a stress change in the concrete to form an acoustic emission source, and the coordinates of the acoustic emission source are determined, which are the locations of the cracks; Repeat the above operation until the positions of all cracks are determined, and the sizes of the cracks are determined by collecting various data of the acoustic waves.

8. The method for using the multifunctional curing mat for sealing concrete curing cracks according to claim 7, characterized in that: The specific steps for calculating the coordinates of the acoustic emission source are: Select any three acoustic sensors and set them as the first sensor, the second sensor, and the third sensor, where: ； ； ； ； in, , , are the times when the first sensor, the second sensor, and the third sensor receive the acoustic emission signal, respectively. , are the horizontal and vertical coordinates of the initial acoustic emission source, , are the horizontal and vertical coordinates of the first sensor, , are the horizontal and vertical coordinates of the second sensor, , are the horizontal and vertical coordinates of the third sensor, is the propagation speed of sound waves in concrete material; According to the horizontal and vertical coordinates of the initial acoustic emission source, reselect the three acoustic sensors that are closest to the horizontal and vertical coordinates of the initial acoustic emission source, and recalculate the horizontal coordinate of the acoustic emission source according to the above formula and the vertical coordinate .

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