JP7644196B2 - Concrete curing mat, concrete moisture condition monitoring device, concrete curing device - Google Patents

Description

The present invention relates to a concrete curing mat, a concrete moisture condition monitoring device, and a concrete curing device.

Since concrete develops its strength through a chemical reaction between water and cement called the hydration reaction, it is important to keep the surface of the concrete moist when curing the poured concrete.
For this reason, the surface of the concrete is covered with a concrete curing mat, water is supplied to the concrete curing mat to keep the surface of the concrete moist, and water is supplied once the concrete curing mat has dried.
Patent Document 1 discloses the following technique for detecting the wetness of a concrete curing mat.
That is, it discloses that two ribbon-shaped metal sheets are prepared, and two electrodes made of these metal sheets are placed between the surface of the concrete and the concrete curing mat, and a voltage is applied between the two electrodes to charge them, and then the charge is discharged and the residual voltage is measured; if the residual voltage falls below a predetermined value, it is determined that the concrete curing mat has dried and is no longer in a moist state.

JP 2018-3240 A

However, in the above-mentioned conventional technology, since the electrodes are made of metal sheets, there is a concern that the electrodes may deteriorate due to exposure to moisture.
In addition, since the work of installing electrodes between the concrete surface and the concrete curing mat is required, there is room for improvement in terms of improving the efficiency of the work.
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a concrete curing mat which is advantageous in terms of improving durability and improving work efficiency, and to provide a concrete wetness monitoring device and a concrete curing device using such a concrete curing mat.

In order to achieve the above-mentioned object, the present invention provides a concrete curing mat comprising: a mat body that is laid on the surface of poured concrete to maintain the concrete in a moist state; and a moisture sensor that is formed into an elongated shape by covering a pair of electrode wires with an insulating material, is incorporated inside the mat body, and changes the capacitance generated between the pair of electrode wires depending on the moisture state of the mat body.
The present invention is also characterized in that the mat body has a constant width and a length perpendicular to this width, and the moisture sensor comprises a plurality of first extension portions spaced apart in the longitudinal direction of the mat body and extending over almost the entire length of the width direction of the mat body, and a plurality of connecting extension portions at the width direction ends of the mat body that connect the ends of adjacent first extension portions in the longitudinal direction of the mat body, and the first extension portion located at one end of the longitudinal direction of the mat body protrudes from the width direction end of the mat body.
In addition, the present invention is characterized in that the mat body is divided into a plurality of regions, and the wetness sensor is incorporated in each of the plurality of regions separately and independently from each other.
The present invention is also characterized in that the mat body has a constant width and a length perpendicular to this width, and the regions are set by dividing the mat body at constant length intervals.
The present invention is also characterized in that, in the above-mentioned region, the moisture sensor comprises a plurality of first extension portions spaced apart in the longitudinal direction of the mat body and extending over almost the entire width direction of the mat body, and a plurality of connecting extension portions at the width direction ends of the mat body that connect the ends of adjacent first extension portions in the longitudinal direction of the mat body, and the first extension portion located at one end of the longitudinal direction of the mat body in the above-mentioned region protrudes from the width direction end of the mat body.
The present invention also provides a concrete wetness monitoring device comprising: a concrete curing mat having a mat body that is laid on the surface of poured concrete to maintain the concrete in a wet state; a wetness sensor formed into an elongated shape by covering a pair of electrode wires with an insulating material and incorporated inside the mat body, in which the capacitance generated between the pair of electrode wires changes depending on the wetness state of the mat body; a physical quantity measuring unit that measures a physical quantity that changes in response to the capacitance of the wetness sensor; a wetness determination unit that determines whether the mat body is in a dry state based on the physical quantity measured by the physical quantity measuring unit; and a warning unit that displays a warning using a display unit when the wetness determination unit determines that the mat body is in a dry state.
The present invention also provides a concrete curing apparatus comprising: a mat body that is laid on the surface of poured concrete to maintain the concrete in a moist state; and a moisture sensor that is formed into an elongated shape by covering a pair of electrode wires with an insulating material and is incorporated inside the mat body, and the capacitance generated between the pair of electrode wires changes depending on the moisture state of the mat body; a water supply unit that supplies water to the mat body; a physical quantity measuring unit that measures a physical quantity that changes in response to the capacitance of the moisture sensor; a moisture determination unit that determines whether the mat body is in a dry state based on the physical quantity measured by the physical quantity measuring unit; and a water supply control unit that causes the water supply unit to supply water when the moisture determination unit determines that the mat body is in a dry state.

According to the concrete curing mat of the present invention, a pair of electrode wires are covered with an insulating material and formed into an elongated shape, and a moisture sensor is incorporated inside the mat body, in which the capacitance generated between the pair of electrode wires changes depending on the moisture state of the mat body.
Therefore, since the moisture sensor is protected by the mat body, this is advantageous in improving the durability of the moisture sensor even if the concrete curing mat is used repeatedly.
In addition, since the wet sensor has a pair of electrode wires covered with an insulator, deterioration of the pair of electrode wires due to moisture can be suppressed, which is advantageous in terms of improving the durability of the wet sensor.
In addition, when curing concrete, all that is required is to place the concrete curing mat on the surface of the concrete and supply water to the concrete curing mat, eliminating the need to run a separate moisture sensor, which is advantageous in improving the efficiency of the work required for curing concrete.
In addition, the moisture sensor comprises a plurality of first extension portions spaced apart along the length of the mat body and extending over almost the entire width of the mat body, and a plurality of connecting extension portions that connect the ends of adjacent first extension portions in the longitudinal direction of the mat body at the widthwise ends of the mat body, and the first extension portion located at one end of the length of the mat body protrudes from the widthwise end of the mat body.This means that the moisture sensor is positioned without bias over the entire area of the mat body, which is advantageous in reliably determining whether the entire area of the mat body is dry or not.
In addition, if the mat body is divided into a plurality of regions and a wetness sensor is installed in each of the plurality of regions separately and independently, this is advantageous in accurately determining the dryness state of each region of the mat body.
Furthermore, if the mat body has a constant width and a length perpendicular to this width, and the regions are set by dividing the mat body at constant lengths, this is advantageous in efficiently setting multiple regions on the mat body.
In addition, in the region, the moisture sensor comprises a plurality of first extension portions spaced apart in the longitudinal direction of the mat body and extending over almost the entire width direction of the mat body, and a plurality of connecting extension portions at the width direction ends of the mat body that connect the ends of adjacent first extension portions in the longitudinal direction of the mat body, and the first extension portion located at one end of the longitudinal direction of the mat body in the region protrudes from the width direction end of the mat body, so that the moisture sensors are positioned without bias throughout the entire area of each region of the mat body, which is advantageous in accurately determining the dryness state in each region.
Furthermore, according to the concrete moisture condition monitoring device of the present invention, a physical quantity that changes in response to the capacitance of the moisture sensor incorporated inside the concrete curing mat is measured, and whether or not the mat body is in a dry state is determined based on the measured physical quantity, and if it is determined that the mat body is in a dry state, a warning is displayed by the display unit.
Therefore, the worker can easily and reliably determine that the concrete curing mat is dry and can perform water supply work to the concrete curing mat, which is advantageous for carrying out concrete curing work efficiently.
Furthermore, with the concrete curing apparatus of the present invention, a physical quantity that changes in response to the capacitance of a moisture sensor built into the concrete curing mat is measured, and it is determined whether or not the mat body is in a dry state based on the measured physical quantity. If it is determined that the mat body is in a dry state, water is automatically supplied to the concrete curing mat, thereby making it possible to supply water to the concrete curing mat while reducing the number of people required, which is advantageous for efficient concrete curing work.

FIG. 2 is a perspective view showing the concrete curing mat of the first embodiment and poured concrete. FIG. 2 is a cross-sectional view illustrating a state in which the concrete curing mat of the first embodiment is used. FIG. 2 is an explanatory diagram of a wetness sensor and a physical quantity measuring unit. 1 is a block diagram showing the configuration of a concrete wetness monitoring device using a concrete curing mat. 1 is a flowchart illustrating a method of using the concrete wetness monitoring device. FIG. 1 is a block diagram showing the configuration of a concrete curing device using a concrete curing mat. 1 is a flowchart illustrating a method of using the concrete curing equipment. 13 is an explanatory diagram showing a state in which a moisture sensor is incorporated separately and independently in each of a plurality of regions of a mat body. FIG.

(First embodiment)
Next, a concrete curing mat and a concrete wetness monitoring device according to an embodiment of the present invention will be described with reference to the drawings.
First, the concrete curing mat will be described.
As shown in FIGS. 1 and 2 , the concrete curing mat 10 includes a mat body 12 and a wetness sensor 14 .
The mat body 12 is laid on the surface 1602 of the poured concrete 16 to keep the concrete 16 in a moist state.
The mat body 12 is formed in a sheet shape from a material having water absorption and water retention properties, such as urethane foam, nonwoven fabric, or synthetic fiber, or is provided with a water-retaining layer formed in a sheet shape by laminating multiple types of these materials.
In addition, in order to suppress evaporation of water from the water retentive layer, a film may be attached to the surface of the water retentive layer located opposite to surface 1602 of concrete 16.
The mat body 12 has a constant width W and a length L perpendicular to the width W, and is formed with dimensions of, for example, width W=1 m and length L=30 m to 50 m.

As shown in FIG. 3, the wet sensor 14 includes a pair of electrode wires 18 and an insulating material 20 that covers the pair of electrode wires 18, and is formed in an elongated shape.
In this embodiment, the insulating material 20 (wet sensor 14) is in the shape of a strip having a width in the direction in which the electrode wires 18 are arranged, a thickness smaller than the width, and a length greater than the width.
The pair of electrode wires 18 extend parallel to each other within the insulating material 20 at a fixed interval in the width direction of the insulating material 20 .
As shown in FIGS. 1 and 2, the wetness sensor 14 is incorporated inside the mat body 12 and changes the capacitance generated between a pair of electrode wires 18 in response to the wetness state of the mat body 12.

The wetness sensor 14 includes a plurality of first extensions 22 and a plurality of connecting extensions 24 .
The first extension portions 22 are spaced apart from one another in the length L direction of the mat body 12 and extend over substantially the entire length of the mat body 12 in the width W direction.
The multiple connecting extensions 24 connect the ends of adjacent first extensions 22 in the longitudinal direction of the mat body 12 at the ends of the mat body 12 in the width W direction.
The first extension portion 22 located at one end of the mat main body 12 in the length L direction protrudes from the end of the mat main body 12 in the width W direction, and the protruding first extension portion 22 is connected to the voltage detection unit 36 (see Figure 3).
In this manner, the wetness sensors 14 are disposed over almost the entire area of the mat body 12 in the width W and length L directions.

Next, the concrete wetness monitoring device will be described.
4, the concrete wetness state monitoring device 26 includes, in addition to the above-mentioned concrete curing mat 10, a physical quantity measuring unit 28, a wetness determining unit 30, a display unit 32, and a warning unit 34. The physical quantity measuring unit 28, the wetness determining unit 30, the display unit 32, and the warning unit 34 are incorporated in a single housing (not shown).
In this embodiment, a voltage detection unit 36 (see FIG. 3), which will be described later and which constitutes a part of the physical quantity measurement unit 28, the wetness determination unit 30, and the warning unit 34 are all implemented by a computer.
That is, the computer is composed of a CPU, a ROM for storing and recording control programs and the like, a RAM as an operating area for the control programs, an interface section for interfacing with peripheral circuits, and the like.
The computer functions as a voltage detection unit 36, a wetness determination unit 30, and a warning unit 34 as a result of the CPU executing a control program.

The physical quantity measuring section 28 measures a physical quantity that changes in response to the capacitance of the wetness sensor 14 .
As shown in FIG. 3, in this embodiment, the physical quantity measuring unit 28 includes an input terminal 2802, a DC power supply 2804, a fixed resistor 2806, an output terminal 2808, and a voltage detecting unit 36.
The input terminal 2802 is connected to one end of a pair of electrode wires 18 .
A DC power supply 2804 is connected to the input terminal 2802 and applies a constant DC voltage Vin between both electrode wires 18 .
The fixed resistor 2806 extracts a charging voltage Et corresponding to the change in capacitance generated between the pair of electrode wires 18 .
The output terminal 2808 is provided so as to be connected to both ends of the fixed resistor 2806 .
The voltage detection unit 36 detects the output voltage Vout at the output terminal.

A capacitor C1 is formed between the pair of insulatingly coated electrode wires 18 according to the relative dielectric constant of the objects present between and around the pair of electrode wires 18.
Here, the relative dielectric constant of air is 1, and the relative dielectric constant of water is 80.4.
The capacitors C1 are connected in parallel along the length of the level sensor 24.
Therefore, the capacitance of capacitor C1 formed when the mat body 12 is wet, i.e., when there is moisture around the wetness sensor 14, is greater than the capacitance of capacitor C1 formed when the mat body 12 is dry, i.e., when there is no moisture around the wetness sensor 14.
In other words, the more moist the mat body 12 is (the more moisture there is), the larger the capacitance of capacitor C1 will be, and the less moist the mat body 12 is (the less moisture there is), the smaller the capacitance of capacitor C1 will be.
In other words, the capacitance of the capacitor C1 changes depending on the amount of moisture in the mat body 12.

Therefore, a constant DC voltage Vin is applied between both electrode wires 18 from the input terminal 2802 to give a charge to both electrode wires 18 , and the output voltage Vout between both electrode wires 18 is measured by the voltage detection unit 36 .
In this case, the relationship of output voltage Vout=Et/(R+2r) is established, where R is the resistance value of the fixed resistor 2806, and r is the inherent resistance of the electrode wire 18.

The measurement result of the output voltage Vout by the voltage detection unit 36 varies depending on the magnitude of the capacitance of the capacitor C1, and therefore the measurement result of the output voltage Vout varies depending on the wetness state (moisture content) of the mat body 12.
Therefore, by conducting experiments to measure the value of the output voltage Vout when the wetness (moisture content) of the mat body 12 is low and water needs to be supplied to the mat body 12, and determining this value as the threshold voltage Vr, it is possible to determine that the mat body 12 is dry and needs water supply when Vout<Vr.
In this embodiment, a case has been described in which the physical quantity measuring unit 28 measures a voltage (output voltage Vout) as a physical quantity that changes in response to the capacitance of the wet sensor 14. However, the physical quantity is not limited to this, and the physical quantity measuring unit 28 may measure the capacitance of the wet sensor 14 itself as the physical quantity.
However, in the present embodiment, the configuration of the physical quantity measuring unit 28 is simplified, which is advantageous in terms of reducing costs.

As shown in FIG. 4, the wetness determining section 30 determines whether or not the mat body 12 is in a dry state based on the physical quantity (voltage value) measured by the physical quantity measuring section 28 .
In this embodiment, the wetness determining unit 30 compares the output voltage Vout with the threshold voltage Vr, and when Vout<Vr, determines that the mat body 12 is dry and requires water supply.

The display unit 32 displays warnings, and in this embodiment is configured with an LED lamp.
The warning section 34 displays a warning on the display section 32 when the wetness determining section 30 determines that the mat body 12 is in a dry state.
In this embodiment, when the wetness determining section 30 determines that the mat body 12 is in a dry state, the warning section 34 causes the display section 32 to flash to display a warning.
Furthermore, the warning unit 34 turns off the display unit 32 when the wetness determining unit 30 does not determine that the mat body 12 is in a dry state (when the mat body 12 is in a wet state).
By displaying such a warning, the wetness (dryness) of the mat body 12 can be grasped at a glance.
In addition, the form of the warning display of the display unit 32 is not limited to flashing, and for example, the display unit 32 may be composed of an LED lamp that can emit light in two colors, red and green, and the display unit 32 may light up in red when it is determined that the mat body 12 is in a dry state, and light up in green when it is determined that it is not in a dry state.
Moreover, a speaker may be provided instead of the display unit 32, and a warning sound may be generated from the speaker by the warning unit 34. As the form of the warning, various conventionally known warning methods may be used.
In addition, the concrete wet state monitoring device 26 may be provided with a communication unit capable of communicating via a wireless line, and when the wetness determination unit 30 determines that the mat body 12 is in a dry state, the warning unit 34 may generate warning information indicating that the mat body 12 is in a dry state.
In this case, the warning information may be transmitted from the communication unit via a wireless line to an external terminal, such as a smartphone, a tablet terminal, or a personal computer, and the warning information may be displayed on the terminal.
In this way, even a worker who is located away from the concrete wetness monitoring device 26 can know through his/her terminal that the mat body 12 is in a dry state, which is advantageous for efficiently carrying out curing work on the concrete 16.

Next, a method of using the concrete curing mat 10 and concrete wetness state monitoring device 26 of this embodiment will be described with reference to the flowchart of Figure 5. Once the concrete 16 has been poured into the formwork, the concrete curing mat 10 is spread and placed on the upward-facing surface 1602 of the concrete 16 so as to cover the entire surface 1602 (step S10), one end of the wetness sensor 14 is connected to the voltage detection unit 36 of the physical quantity measuring unit 28, and the concrete wetness state monitoring device 26 is put into operation (step S12).
Next, water is supplied to the entire area of the concrete curing mat 10 (mat body 12) so that the entire area of the concrete curing mat 10 is moistened and ready for curing of the concrete 16 (step S14).

The wetness determining unit 30 determines whether the concrete curing mat 10 is in a dry state based on whether the output voltage Vout detected by the voltage detecting unit 36 is less than the reference voltage Vr (step S16).
If the determination result in step S16 is negative, the process returns to step S16.
If the determination result in step S16 is positive, the warning unit 34 causes the display unit 32 to flash, thereby displaying a warning that the concrete curing mat 10 is dry (step S18).
The worker who has recognized the warning displayed by the display unit 32 supplies water to the concrete curing mat 10 to make the concrete curing mat 10 wet (step S20).
When the concrete curing mat 10 becomes wet, the output voltage Vout detected by the voltage detection unit 36 becomes equal to or greater than the reference voltage Vr, and the wetness determination unit 30 determines that the concrete curing mat 10 is not dry, which causes the warning unit 34 to turn off the display unit 32 and cancel the warning display (step S22), and the process returns to step S16.
By repeating such an operation, the concrete 16 is effectively cured by the concrete curing mat 10 which is kept moist, and the concrete 16 hardens due to the hydration reaction of the concrete 16, thereby developing strength.

As described above, according to the concrete curing mat 10 of this embodiment, a pair of electrode wires 18 are covered with insulating material 20 and formed into an elongated shape, and a moisture sensor 14 is incorporated inside the mat body 12, in which the capacitance generated between the pair of electrode wires 18 changes depending on the moisture state of the mat body 12.
Therefore, since the moisture sensor 14 is protected by the mat body 12, this is advantageous in improving the durability of the moisture sensor 14 even if the concrete curing mat 10 is used repeatedly.
In addition, since the wet sensor 14 has the pair of electrode wires 18 covered with an insulator, deterioration of the pair of electrode wires 18 due to moisture can be suppressed, which is advantageous in improving the durability of the wet sensor 14.
In addition, when curing the concrete 16, it is only necessary to place the concrete curing mat 10 on the surface 1602 of the concrete 16 and supply water to the concrete curing mat 10, and there is no need to take the time to run a separate moisture sensor 14, which is advantageous in improving the efficiency of the work required to cure the concrete 16.

In addition, the concrete curing mat 10 of this embodiment has a constant width W and a length L perpendicular to this width W, and the moisture sensor 14 is provided with a plurality of first extension portions 22 spaced apart in the length L direction of the mat body 12 and extending over almost the entire length of the mat body 12 in the width W direction, and a plurality of connecting extension portions 24 that connect the ends of adjacent first extension portions 22 in the longitudinal direction of the mat body 12 at the ends of the mat body 12 in the width W direction, and the first extension portion 22 located at one end of the mat body 12 in the length L direction protrudes from the end of the mat body 12 in the width W direction, but the shape of the moisture sensor 14 incorporated inside the mat body 12 is not limited to the embodiment and is arbitrary.
However, in the present embodiment, the wetness sensors 14 are positioned evenly across the entire area of the mat body 12, which is advantageous in reliably determining whether or not the entire area of the mat body 12 is dry.

Furthermore, the concrete wetness monitoring device 26 of this embodiment measures a physical quantity that changes in response to the capacitance of the wetness sensor 14 incorporated inside the concrete curing mat 10, and determines whether or not the mat body 12 is in a dry state based on the measured physical quantity. If it is determined that the mat body 12 is in a dry state, a warning is displayed by the display unit 32.
Therefore, the worker can easily and reliably grasp that the concrete curing mat 10 is in a dry state and perform water supply work to the concrete curing mat 10, which is advantageous for efficiently performing the curing work of the concrete 16.

Second Embodiment
Next, a concrete curing apparatus 38 according to a second embodiment will be described with reference to FIG.
In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.
A concrete curing apparatus 38 of the second embodiment uses the concrete curing mat 10 of the first embodiment and is adapted to automatically supply water.

As shown in FIG. 6 , the concrete curing apparatus 38 includes a concrete curing mat 10 , a physical quantity measuring unit 28 , a wetness determining unit 30 , a water supply control unit 40 , and a water supply unit 42 .
The concrete curing mat 10, the physical quantity measuring unit 28, and the wetness determining unit 30 are the same as those in the first embodiment, and therefore their description will be omitted.
The water supply section 42 supplies water to the concrete curing mat 10 and is composed of, for example, a pipeline that supplies water from a water storage tank to the concrete curing mat 10, a sprinkler outlet provided at the end of the pipeline that sprays water onto the concrete curing mat 10, and an electromagnetic valve provided in the pipeline.
The water supply control unit 40 is configured by a computer, and when the wetness determining unit 30 determines that the mat body 12 is in a dry state, causes the water supply unit 42 to supply water.
That is, when the wetness determining unit 30 determines that the mat body 12 is in a dry state, the solenoid valve is opened for a certain period of time to supply water to the concrete curing mat 10. When the wetness determining unit 30 does not determine that the mat body 12 is in a dry state, the solenoid valve is closed to stop the supply of water to the concrete curing mat 10.

Next, a method of using the concrete curing apparatus 38 will be described with reference to the flow chart of FIG.
Once the concrete 16 has been poured into the formwork, the concrete curing mat 10 is spread and placed on the upward facing surface 1602 of the concrete 16 so as to cover the entire area of the surface 1602 (step S50).
In addition, a water supply section 42 is installed so that water can be supplied to the concrete curing mat 10 (step S52).
Next, one end of the moisture sensor 14 is connected to the voltage detection unit 36 of the physical quantity measurement unit 28, and the concrete curing device 38 is put into operation (step S54).
Next, water is supplied to the entire area of the concrete curing mat 10 (mat body 12) by the water supply unit 42, so that the entire area of the concrete curing mat 10 is moistened and ready for curing of the concrete 16 (step S56).

The wetness determining unit 30 determines whether the concrete curing mat 10 is in a dry state based on whether the output voltage Vout detected by the voltage detecting unit 36 is less than the reference voltage Vr (step S58).
If the determination result in step S58 is negative, the process returns to step S58.
If the determination result in step S58 is positive, the water supply control unit 40 controls the water supply unit 42 to supply water to the concrete curing mat 10 for a certain period of time (step S60), and the process returns to step S58.
By repeating this operation, water is automatically supplied to the concrete curing mat 10, thereby maintaining the concrete curing mat 10 in a moist state. The concrete 16 is effectively cured by the concrete curing mat 10 maintained in a moist state, and the hydration reaction of the concrete 16 causes the concrete 16 to harden and develop strength.

With this type of concrete curing device 38, water is automatically supplied to the concrete curing mat 10 when the concrete curing mat 10 becomes dry, which allows water supply to the concrete curing mat 10 while reducing the number of workers required, which is advantageous for efficiently curing the concrete 16.

Third Embodiment
Next, a concrete curing mat 10 according to a third embodiment will be described with reference to FIG.
The third embodiment differs from the first embodiment in that the mat body 12 is divided into a plurality of regions A, and the moisture sensor 14 is incorporated in each of the plurality of regions A separately and independently from one another.
In the third embodiment, as shown in FIG. 6, the mat body 12 has a constant width W and a length L perpendicular to this width.
The regions A are set by dividing the mat body 12 at regular intervals of a length ΔL.
In area A, the moisture sensor 14 has a plurality of first extension portions 22 spaced apart in the length L direction of the mat body 12 and extending over almost the entire length of the mat body 12 in the width W direction, and a plurality of connecting extension portions 24 that connect the ends of adjacent first extension portions 22 in the longitudinal direction of the mat body 12 at the ends of the mat body 12 in the width W direction.
The first extension portion 22 located at one end of the mat body 12 in the length L direction in the region A protrudes from the end of the mat body 12 in the width W direction.

According to the concrete curing mat 10 of the third embodiment, it is possible to precisely determine whether each area A of the mat body 12 is in a dry state or not.
For example, in the case of a mat body 12 having a width W of 1 m and a length L of 50 m, the mat body 12 will not necessarily be in a moist state, i.e., the amount of moisture contained in the mat body 12 will not necessarily be uniform, over the entire length L direction. It is expected that, depending on the influences of temperature and wind conditions, the volume of the poured concrete 16, etc., even if a moist state is maintained in one area A, another area A may be in a dry state.
In this case, if a single wetness sensor 14 is incorporated inside the mat body 12, it is possible to determine whether the entire mat body 12 over 50 m is in an average dry state, but it is difficult to determine whether the mat body 12 is in a finely detailed dry state.
Therefore, by applying the concrete wetness state monitoring device 26 described in the first embodiment to each area A of the mat body 12, a detailed warning can be issued to areas A that have become dry based on the wetness state of each area A of the mat body 12, and water can be appropriately supplied to areas A that are determined to be dry, which is advantageous for carrying out curing work on the concrete 16 efficiently and in a detailed manner.
Furthermore, by applying the concrete curing device 38 described in the second embodiment to each area A of the mat body 12, water can be supplied in a detailed manner to areas A that are determined to be in a dry state based on the wetness state of each area A of the mat body 12, which is advantageous in performing curing work of the concrete 16 efficiently and in a detailed manner while reducing the number of people required.

In the third embodiment, a case has been described in which a mat body 12 having a constant width W and a length L perpendicular to this width is divided into multiple regions A at constant lengths ΔL of the mat body 12, but the setting of multiple regions A is arbitrary.
However, this embodiment is advantageous in efficiently setting a plurality of regions A in the mat body 12 having a constant width W and a length L perpendicular to this width.

In addition, in the third embodiment, in region A, the moisture sensor 14 has a plurality of first extension portions 22 and a plurality of connecting extension portions 24, and the first extension portion 22 located at one end of the length L direction of the mat main body 12 in region A protrudes from the end of the mat main body 12 in the width W direction, but the shape of the moisture sensor 14 incorporated in each region A of the mat main body 12 is not limited to the embodiment and is arbitrary.
However, in the present embodiment, the moisture sensors 14 are positioned evenly throughout the entire area of each region A of the mat body 12, which is advantageous in reliably determining whether or not each region A is dry.

In the embodiment, the concrete curing mat 10 is placed on the upward-facing surface (top surface) 1602 of the concrete 16, but it goes without saying that the concrete curing mat 10 may be placed on top of the side-facing surface (side surface) of the concrete 16.

Reference Signs List 10 Concrete curing mat 12 Mat body 14 Wetness sensor 16 Concrete 16 02 Surface 18 Electrode wire 20 Insulating material 22 First extension 24 Connection extension 26 Concrete wetness detection device 28 Physical quantity measurement unit 2802 Input terminal 2804 DC power supply 2806 Fixed resistor 2808 Output terminal 30 Wetness determination unit 32 Display unit 34 Warning unit 36 Voltage detection unit 38 Concrete curing device 40 Water supply control unit 42 Water supply unit

Claims (3)

a concrete curing mat including: a mat body that is laid on the surface of poured concrete to keep the concrete moist; and a moisture sensor that is formed into an elongated shape by covering a pair of electrode wires with an insulating material, that is incorporated inside the mat body, and that changes the electrostatic capacitance generated between the pair of electrode wires depending on the moist state of the mat body;
a physical quantity measuring unit that measures a physical quantity that changes in response to the capacitance of the wetness sensor;
a wetness determination unit that determines whether the mat body is in a dry state based on the physical quantity measured by the physical quantity measurement unit;
A communication unit capable of communicating via a wireless line;
A concrete wetness monitoring device comprising: The concrete wetness monitoring device according to claim 1, characterized in that when the wetness determination unit determines that the mat body is in a dry state, the communication unit displays warning information on an external terminal via a wireless line. The concrete curing mat has a filler on the surface opposite to the surface of the concrete. Room
3. The apparatus for monitoring the wetness of concrete according to claim 1 or 2.

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