Concrete curing mat, concrete moisture condition monitoring device, concrete curing device

Abstract

To provide a concrete curing mat that is advantageous for improving durability and improving efficiency of work.SOLUTION: A pair of electrode wires 18 are covered with an insulating material 20 to form an elongated shape, and a wet sensor 14 in which capacitance generated between the pair of electrode wires 18 is changed according to a wet state of a mat body 12 is incorporated in the mat body 12. Since the wet sensor 14 is protected by the mat body 12, even if the concrete curing mat 10 is repeatedly used, it is advantageous in improving the durability of the wet sensor 14. Since the wet sensor 14 covers the pair of electrode wires 18 with the insulating material, the 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 a curing work of a concrete 16, since the labor for separately routing the wet sensor 14 is not required, it is advantageous in improving the efficiency of the work required for curing the concrete 16.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a concrete curing mat, a concrete wetness state monitoring device, and a concrete curing device. [Background technology]

[0002] 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, the patent 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. The charge is then discharged and the residual voltage is measured, and if the residual voltage falls below a predetermined value, it is determined that the concrete curing mat has dried out and is no longer in a moist state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-3240 A Summary of the Invention [Problem to be solved by the invention]

[0004] 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 moisture condition monitoring device and a concrete curing device using such a concrete curing mat. [Means for solving the problem]

[0005] 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 separately and independently in each of the plurality of regions. 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. Effect of the Invention

[0006] 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 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, if 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 at the width 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 length of the mat body protrudes from the width end of the mat body, 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. In addition, 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 a 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 whether or not the mat body is in a dry state is determined 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. [Brief description of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a concrete curing mat of a first embodiment and poured concrete. FIG. [Diagram 2] FIG. 2 is a cross-sectional view illustrating a state in which the concrete curing mat of the first embodiment is used. [Diagram 3]FIG. 2 is an explanatory diagram of a wetness sensor and a physical quantity measuring unit. [Figure 4] 1 is a block diagram showing the configuration of a concrete wetness monitoring device using a concrete curing mat. [Diagram 5] 1 is a flowchart illustrating a method of using the concrete wetness monitoring device. [Figure 6] FIG. 1 is a block diagram showing the configuration of a concrete curing device using a concrete curing mat. [Figure 7] 1 is a flowchart illustrating a method of using the concrete curing equipment. [Figure 8] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (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 moist. 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.

[0009] 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 depending on the wetness state of the mat body 12.

[0010] 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 the first extensions 22 adjacent to each other 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.

[0011] 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, a computer is composed of a CPU, a ROM for storing and recording control programs, 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.

[0012] 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 detection 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.

[0013] 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 in a wet state, that is, when moisture exists around the moisture sensor 14, is larger than the capacitance of capacitor C1 formed when the mat body 12 is dry, that is, when no moisture exists around the moisture sensor 14. That is, the higher the degree of wetness of the mat body 12 (the more moisture), the larger the capacitance of capacitor C1, and the lower the degree of wetness of the mat body 12 (the less moisture), the smaller the capacitance of capacitor C1. In other words, the capacitance of capacitor C1 changes according to the moisture content of the mat body 12.

[0014] Therefore, a constant DC voltage Vin is applied between the two electrode lines 18 from the input terminal 2802 to charge the two electrode lines 18, and the output voltage Vout between the two electrode lines 18 is measured by the voltage detection unit 36. In this case, the relationship of output voltage Vout = Et / (R + 2r) holds. Here, R is the resistance value of the fixed resistor 2806, and r is the specific resistance of the electrode line 18.

[0015] The measurement result of the output voltage Vout by the voltage detection unit 36 changes according to the magnitude of the capacitance of capacitor C1. Therefore, the measurement result of the output voltage Vout changes according to the wet state (moisture content) of the mat body 12. Therefore, through experiments, if the value of the output voltage Vout in a state where the wet state (moisture content) of the mat body 12 is low and water supply to the mat body 12 is required is measured and determined as the threshold voltage Vr, it can be determined that the mat body 12 is in a dry state and water supply is required when Vout < Vr. In addition, in this embodiment, the case where the physical quantity measurement unit 28 measures the voltage (output voltage Vout) as the physical quantity that changes corresponding to the capacitance of the moisture sensor 14 has been described. However, the physical quantity is not limited, and the physical quantity measurement unit 28 may measure the capacitance of the moisture sensor 14 itself as the physical quantity. However, with the configuration of the present embodiment, the configuration of the physical quantity measurement unit 28 is simplified, which is advantageous for cost reduction.

[0016] As shown in FIG. 4, the wetness determination unit 30 determines whether the mat body 12 is in a dry state based on the physical quantity (voltage value) measured by the physical quantity measurement unit 28. In the present embodiment, the wetness determination unit 30 compares the output voltage Vout with the threshold voltage Vr, and determines that the mat body 12 is in a dry state and water supply is required when Vout < Vr.

[0017] The display unit 32 performs warning display. In the present embodiment, it is composed of an LED lamp. The warning unit 34 performs warning display by the display unit 32 when the wetness determination unit 30 determines that the mat body 12 is in a dry state. In the present embodiment, when the wetness determination unit 30 determines that the mat body 12 is in a dry state, the warning unit 34 blinks the display unit 32 to perform warning display. Further, when the wetness determination 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), the warning unit 34 turns off the display unit 32. By performing such warning display, the wetness state (dry state) of the mat body 12 can be grasped at a glance. Note that the form of the warning display of the display unit 32 is not limited to blinking. For example, the display unit 32 may be composed of an LED lamp capable of emitting light in two colors, red and green. When it is determined that the mat body 12 is in a dry state, the display unit 32 is lit in red, and when it is determined otherwise, the display unit 32 is lit in green. Alternatively, a speaker may be provided instead of the display unit 32, and the warning unit 34 may generate a warning sound from the speaker. Various conventionally known warning methods can be used for the form of the warning. In addition, the concrete wetness 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 far away from the concrete wetness monitoring device 26 can know through the terminal that the mat body 12 is in a dry state, which is advantageous in carrying out the curing work of the concrete 16 efficiently.

[0018] Next, a method of using the concrete curing mat 10 and the concrete wetness monitoring device 26 according to the present embodiment 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 surface 1602 (step S10), one end of the moisture sensor 14 is connected to the voltage detection unit 36 ​​of the physical quantity measuring unit 28, and the concrete moisture 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) to wet the entire area of ​​the concrete curing mat 10 so that the concrete 16 can be cured (step S14).

[0019] 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 blink, and a warning display is given that the concrete curing mat 10 is in a dry state (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, causing 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 maintains a moist state, and the concrete 16 hardens due to the hydration reaction of the concrete 16, thereby developing strength.

[0020] 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 wetness sensor 14 is protected by the mat body 12, this is advantageous in improving the durability of the wetness 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 for curing the concrete 16.

[0021] 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 comprises 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.

[0022] Furthermore, in the concrete moisture condition monitoring device 26 of this embodiment, a physical quantity that changes in response to the capacitance of the moisture sensor 14 incorporated inside the concrete curing mat 10 is measured, and whether or not the mat body 12 is in a dry state is determined based on the measured physical quantity, and 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.

[0023] (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.

[0024] 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 similar to those in the first embodiment, and therefore their explanation will be omitted. The water supply section 42 supplies water to the concrete curing mat 10 and is composed, for example, of a pipeline that supplies water from a water storage tank to the concrete curing mat 10, a sprinkler port provided at the end of the pipeline that sprinkles water onto the concrete curing mat 10, and an electromagnetic valve provided in the pipeline. The water supply control section 40 is configured by a computer, and when the wetness determining section 30 determines that the mat body 12 is in a dry state, causes the water supply section 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.

[0025] Next, a method of using the concrete curing equipment 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). Furthermore, the water supply unit 42 is installed so as to be able to supply water 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).

[0026] 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.

[0027] According to this type of concrete curing apparatus 38, when the concrete curing mat 10 becomes dry, water is automatically supplied to the concrete curing mat 10, which makes it possible to supply water to the concrete curing mat 10 while reducing the number of workers required, which is advantageous for efficiently curing the concrete 16.

[0028] (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 into each of the plurality of regions A separately and independently from each other. 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 region 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.

[0029] According to the concrete curing mat 10 of the third embodiment, it is possible to precisely determine whether each region 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 certain area A is maintained in a moist state, 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 mat body 12 is in an average dry state over the entire 50 m of the mat body 12, but it is difficult to determine whether the mat body 12 is in a finely detailed dry state. Therefore, by applying the concrete moisture condition 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 moisture condition 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 the area A 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 the curing work of the concrete 16 efficiently and in a detailed manner while reducing the number of people required.

[0030] 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.

[0031] 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 mat main body 12 in the length L direction 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 wetness sensors 14 are arranged 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.

[0032] In addition, in the embodiment, the concrete curing mat 10 is described as being 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 also be placed overlapping a side-facing surface (side surface) of the concrete 16. [Explanation of symbols]

[0033] 10 Concrete curing mat 12 Mat body 14 Wet Sensor 16 Concrete 1602 Surface 18 Electrode wire 20 Insulation materials 22 1st extension part 24 Connection extension 26 Concrete Wetness Detection Device 28 Physical quantity measurement section 2802 Input terminal 2804 DC power supply 2806 fixed resistance 2808 Output terminal 30 Wetness determination unit 32 Display section 34 Warning section 36 Voltage detection section 38 Concrete curing equipment 40 Water supply control section 42 Water supply section

Claims

1. 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 formed in an elongated shape by covering a pair of electrode wires with an insulating material, which is incorporated inside the mat body and 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:

2. When the wetness determining 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.

2. The apparatus for monitoring the wetness of concrete according to claim 1.

3. The concrete curing mat has a film on the surface opposite to the surface of the concrete.

3. The apparatus for monitoring the wetness of concrete according to claim 1 or 2.

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