JP2016089381A - Concrete curing structure and concrete curing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete curing structure for allowing easy installation and removal, improving heat and moisture retaining performances, and reducing material and electric power costs by using an easy curing method.SOLUTION: A concrete curing structure 1 includes a hygroscopically exothermic fiber sheet 11 laid along a concrete surface 2a, and having characteristics of reacting to moisture to generate heat, a heat insulating material 12 overlaid on the side of a surface 11a of the hygroscopically exothermic fiber sheet 11, and aluminum sheets 13A, 13B provided along both the surface and reverse sides of the heat insulating material 12, and having characteristics of blocking far-infrared rays. It is arranged covering the surface 2a of a concrete 2 after placed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete curing structure and a concrete curing method.

  Conventionally, in mass concrete used in buildings, in order to reduce the occurrence of cracks due to thermal stress caused by heat of hardening, the concrete surface after placement is covered with a curing sheet and heat insulation and moisture retention curing are carried out. Is common. And when the further heat retention performance is required, the heat insulation curing material using a heating wire etc. is utilized (for example, refer patent document 1).

  In Patent Document 1, a belt-like heater in which a ceramic heating element is connected by a conductive wire is arranged around a mold after placing concrete, and the entire mold including the belt-like heater is covered with a heat insulating sheet and cured. It describes the concrete curing method.

JP 2002-242434 A

However, the conventional concrete curing method has the following problems.
That is, in the curing method using a heat insulating curing material using a heating element, a heating wire, or the like as shown in Patent Document 1, there is a problem that material costs such as these heating wires and electricity charges increase. Moreover, in the case of the heat-retaining curing using the heating wire as described above, it takes time and effort to install and remove.
Therefore, there is a demand for a concrete curing method that can ensure higher heat retention performance and moisture retention performance and is low in cost, and there is room for improvement in that respect.

The present invention has been made in view of the above-described problems, and provides a concrete curing structure and a concrete curing method that can be easily installed and removed by a simple curing method, and can improve heat retention performance and moisture retention performance. The purpose is to do.
Another object of the present invention is to provide a concrete curing structure and a concrete curing method capable of reducing material costs and electrical costs.

  In order to achieve the above object, the concrete curing structure according to the present invention is a concrete curing structure arranged so as to cover the surface of the concrete after placing, and is laid along the concrete surface and reacts to moisture. A heat-absorbing heat-generating fiber sheet having a property of generating heat, a heat insulating material provided on the surface side of the water-absorbing heat-generating fiber sheet, and provided on both the front and back surfaces of the heat insulating material and having a property of blocking far infrared rays And a shielding material.

  Further, the concrete curing method according to the present invention is a concrete curing method for covering the surface of the concrete after placing, and a barrier material having a characteristic of blocking far infrared rays is applied to both front and back surfaces of the heat insulating material. A step of providing along the surface, a step of providing a heat insulating material provided with the blocking material on the surface side of the moisture absorbing heat generating fiber sheet having a property of generating heat in response to moisture, and the moisture absorbing heat generating fiber provided with the heat insulating material. And a step of laying the sheet along the concrete surface after placement.

  Further, the concrete curing method according to the present invention is a concrete curing method for covering the surface of the concrete after placing, and placing a hygroscopic exothermic fiber sheet having a characteristic of generating heat in response to moisture. A step of laying along the surface of the concrete afterwards, a step of providing a first blocking material having a characteristic of blocking far-infrared rays along the surface of the moisture-absorbing heat-generating fiber sheet, and a heat insulating material on the surface side of the first blocking material And a step of providing a second blocking material having a characteristic of blocking far infrared rays along the surface of the heat insulating material.

In the present invention, the moisture-absorbing heat-generating fiber sheet is disposed in close contact with the surface of the concrete after placement, so heat is generated by absorbing excess moisture generated from the concrete surface, and the heat retention effect of the concrete can be enhanced. . In addition, since the moisture-absorbing exothermic fiber sheet is closely adhered along the concrete surface, moisture retention performance can be ensured. Furthermore, since the heat insulating material is provided so as to overlap the surface side of the moisture-absorbing heat-generating fiber sheet, the heat retaining effect can be maintained. In addition, since both the front and back sides of the heat insulating material are covered with a blocking material that blocks far-infrared rays, the heat insulating material itself can be prevented by blocking the heat from entering and leaving the outside air temperature and the inside of the concrete and not transferring the heat of the heat insulating material to the concrete. Therefore, it is possible to ensure the moisture retaining performance because the shielding material also has the water shielding performance.
Therefore, in the present invention, rapid escape of moisture in the concrete can be suppressed, the initial drying of the concrete can be suppressed, and the occurrence of cracks and the like can be prevented.

Further, in the present invention, it is not a complicated configuration using a heating wire, but can be realized by a simple configuration such as laminating a hygroscopic heating fiber sheet, a heat insulating material, and a shielding material, which are cheaper than a heating wire, Since there is no need to increase the number of curing sheets as in the prior art, the member cost can be reduced.
And since it becomes the method which does not use a heating wire, while being able to suppress the amount of electricity used, it can also reduce an electrical cost and can also attain weight reduction, and the construction accompanying installation and removal becomes easy. There are advantages.

  Furthermore, the concrete curing structure of the present invention has a configuration in which a moisture-absorbing exothermic fiber sheet, a heat insulating material, and a blocking material are laminated, and as described above, a member that greatly affects the change in shape such as a heating wire is not used. Even when the concrete surface is a curved surface, it is easy to be placed along the concrete surface while being curved and in close contact with each other, and the application range can be expanded.

  Moreover, it is preferable that the concrete curing structure according to the present invention has a laminated structure in which the heat insulating material sandwiched from both the front and back surfaces by the blocking material and the hygroscopic heat generating fiber sheet are bonded by an adhesive.

  In this case, the moisture-absorbing exothermic fiber sheet and the heat insulating material can be fixed integrally with an adhesive in advance, so in the concrete curing place, the integrated concrete curing structure is applied to the concrete surface after placing. The work is simply arranged, and construction can be easily performed.

According to the concrete curing structure and the concrete curing method of the present invention, a conventional curing method such as a heating wire is not required, so that it becomes a simple curing method, can be easily installed and removed, and the construction time Can be shortened. And the heat retention performance and moisture retention performance can be improved by the combination of a moisture-absorbing exothermic fiber sheet and a heat insulating material.
Moreover, in this invention, since it becomes the curing method which uses a cheap hygroscopic exothermic fiber sheet compared with an expensive heating wire, material cost and electrical cost can be reduced.

It is a fragmentary sectional view which shows the structure of the concrete curing structure by embodiment of this invention. It is the fragmentary sectional view which showed the concrete curing structure shown in FIG. 1 in detail. It is a figure which shows the result of an Example, Comprising: It is a figure which shows the air permeability coefficient of the surface layer part in an Example and each comparative example. It is a figure which shows the result of an Example, Comprising: It is a figure which shows the relationship of the age change and mass change after application | coating in an Example and each comparative example.

  Hereinafter, a concrete curing structure and a concrete curing method according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the concrete curing structure 1 according to the present embodiment is arranged so as to cover the concrete surface 2 a during the curing period of the placed concrete 2. Here, as concrete to be applied, mass concrete, cold concrete, and the like can be targeted. However, the present invention is not limited to this, and can be applied to general concrete curing.

  The concrete curing structure 1 is laid along the concrete surface 2a, and has a characteristic of generating moisture in response to moisture and generating heat, and a heat insulating material 12 provided to overlap the surface 11a of the moisture absorption and heating fiber sheet 11. And an aluminum sheet 13 (blocking material) provided along both the front and back surfaces of the heat insulating material 12 and having a characteristic of blocking far-infrared rays.

  The moisture-absorbing heat-generating fiber sheet 11 is a non-woven fabric type self-heating material, and is generally called a moisture-absorbing heat-generating fiber, and is a sheet-like fiber that absorbs moisture generated from the concrete surface 2a to generate heat and keep it warm. As the moisture absorption exothermic fiber sheet 11, for example, a material such as HEATTECH (registered trademark, manufactured by UNIQLO Co., Ltd.) can be employed. As the rising temperature of the moisture-absorbing exothermic fiber sheet 11 during concrete curing, for example, a rise of about 10 ° C. is targeted. Moreover, it is preferable to adjust to an appropriate temperature according to seasons such as summer and winter.

As the heat insulating material 12, for example, a bubble cushioning material (“Puchipuchi” registered trademark: manufactured by Kawakami Sangyo Co., Ltd.), an air bag, cardboard, polystyrene foam, or the like can be used. Moreover, a higher heat insulation effect can be obtained by using a gas such as argon having a heat insulation effect other than air as a buffer contained in the interior.
The heat insulating material 12 has a predetermined thickness and is provided over the entire surface of the hygroscopic heat-generating fiber sheet 11.

Here, the heat insulating material 12 can heighten the heat retention effect by increasing the thickness dimension. Note that the heat transfer coefficient of one ordinary bubble cushioning material (bubble wrap sheet) is 8.7 W / m ² · ° C.
Moreover, about the moisture retention performance of the heat insulating material 12, it is preferable that mass change (%) is small.
Furthermore, it is preferable that the heat insulating material 12 has high water shielding performance.

The aluminum sheet 13 is a material that blocks far-infrared rays, and the one disposed on the outermost side in the overlapping direction (second aluminum sheet 13A) blocks heat transfer from the outside such as direct sunlight and cold air. On the other hand, when the temperature of the heat insulating material 12 itself increases, the inner one (the first aluminum sheet 13B) improves the heat retaining property by preventing heat transfer from the heat insulating material 12 itself from being transmitted to the concrete 2.
The blocking material is not limited to the aluminum sheet 13 as in the present embodiment, and an aluminum foil or the like can be employed, for example.

  In this way, the concrete curing structure 1 has a laminated structure in which the heat insulating material 12 sandwiched from both the front and back surfaces by the aluminum sheet 13 and the hygroscopic heating fiber sheet 11 are bonded by the adhesive material 14 as shown in FIG. Yes.

Next, the effect | action of the concrete curing structure and concrete curing method mentioned above is demonstrated based on drawing.
As shown in FIG. 1, the concrete curing structure 1 of the present embodiment lays a moisture-absorbing heat-generating fiber sheet 11 having a characteristic of generating heat in response to moisture along the concrete surface 2a after being placed, A heat insulating material 12 provided with aluminum sheets 13A and 13B having a blocking characteristic along both the front surface 11a and the back surface 11b is provided on the surface 11a side of the moisture-absorbing heat-generating fiber sheet 11 with an adhesive 14 (FIG. 2). Can be installed.

  In this construction, the aluminum sheets 13A and 13B provided in advance on both the front and back surfaces of the heat insulating material 12 may be bonded on the site using the adhesive material 14 along the hygroscopic heating fiber sheet 11. The aluminum sheets 13A and 13B may be bonded to the heat insulating material 12 on site. That is, the first aluminum sheet 13B is provided along the surface 11a of the hygroscopic heating fiber sheet 11 laid along the concrete surface 2a after placement, and the heat insulating material 12 is provided on the surface side of the first aluminum sheet 13B. Further, it is possible to install the concrete curing structure 1 by providing the second aluminum sheet 13A along the surface of the heat insulating material 12.

In this way, the hygroscopic heating fiber sheet 11 is disposed in close contact with the surface 2a of the concrete 2 after placing, so heat is generated by absorbing excess moisture generated from the concrete surface 2a, and the heat retaining effect of the concrete 2 Can be increased.
In addition, since the moisture-absorbing heat-generating fiber sheet 11 is closely adhered and coated along the concrete surface 2a, the moisture retention performance can be ensured. Furthermore, since the heat insulating material 12 is provided so as to overlap the surface 11a side of the moisture-absorbing exothermic fiber sheet 11, the heat retaining effect can be maintained. Furthermore, both the front and back surfaces of the heat insulating material 12 are covered with aluminum sheets 13A and 13B that block far-infrared rays, so that the heat flow between the outside air temperature and the inside of the concrete is blocked and the heat of the heat insulating material 12 is transmitted to the concrete 2. By not doing so, the heat insulation performance of the heat insulating material 12 itself can be ensured, and the barrier material 12 can also ensure the moisture retention performance because it has the water shielding performance.
Therefore, the thermal stress is reduced by keeping the concrete 2 warm, and in addition, it is possible to suppress the rapid release of moisture in the concrete, to prevent the initial drying of the concrete 2 and to generate cracks and the like. Can be prevented.

Moreover, in the concrete curing structure 1 of this Embodiment, it is not the complicated structure which uses a heating wire, but the moisture absorption heat-generating fiber sheet 11, the heat insulating material 12, and the aluminum sheet 13 which are cheap compared with a heating wire are laminated | stacked. Since it can be realized with a simple configuration and there is no need to increase the number of curing sheets as in the prior art, the member cost can be reduced.
And since it becomes the method which does not use a heating wire, while being able to suppress the amount of electricity used, it can also reduce an electrical cost and can also attain weight reduction, and the construction accompanying installation and removal becomes easy. There are advantages.

  Furthermore, the concrete curing structure 1 of the present embodiment has a configuration in which the moisture-absorbing exothermic fiber sheet 11, the heat insulating material 12, and the aluminum sheet 13 are laminated, and as described above, a member having a large influence on the change of the shape of the heating wire or the like. Since it is not used, even if the concrete surface 2a is a curved surface, it can be easily placed in close contact with the concrete surface 2a in a curved manner, and the application range can be expanded.

Moreover, in this Embodiment, since the moisture absorption heat generation fiber sheet 11 and the heat insulating material 12 can be integrally fixed previously with the adhesive material 14, in the concrete curing location, the integrated concrete curing structure 1 is provided. It becomes an operation | work only to arrange | position to the concrete surface 2a after placement, and it can construct easily.
Here, as a concrete curing method in this case, aluminum sheets 13A and 13B are provided along both front and back surfaces of the heat insulating material 12, and the heat insulating material 12 provided with the aluminum sheets 13A and 13B is provided on the surface side of the moisture-absorbing exothermic fiber sheet 11. The concrete curing structure 1 is prepared in a state of being stacked on. This production work may be produced in a factory or the like, for example, or may be produced using a space such as a material storage place different from the concrete placement site on site. Then, a concrete curing structure 1 (a hygroscopic exothermic fiber sheet 11 provided with a heat insulating material 12) prepared in advance may be carried into the concrete placement site and laid along the concrete surface 2a after placement.

As described above, the concrete curing structure and the concrete curing method according to the present embodiment eliminates the need for a conventional heat curing material such as a heating wire, so that it is a simple curing method and can be easily installed and removed. The construction time can be shortened. Moreover, the combination of the moisture-absorbing heat generating fiber sheet 11 and the heat insulating material 12 can improve the heat retaining performance and the moisture retaining performance.
Moreover, in this Embodiment, since it becomes the curing method which uses the moisture absorption heat_generation | fever fiber sheet 11 cheaper than an expensive heating wire, it can reduce material cost and electrical cost.

  Next, examples carried out to support the effects of the concrete curing structure and the concrete curing method according to the above-described embodiment will be described below.

Example 1
As shown in FIG. 3, Example 1 has a concrete curing structure in which the moisture-absorbing heat-generating fiber sheet 11 and the heat insulating material 12 according to the above-described embodiment are laminated on the concrete that has been demolded after a predetermined curing period. The air permeability coefficient (× 10 ⁻¹⁶ m ² ) of the examples used, Comparative Examples 1 to 6 using different conventional coating agents, and Comparative Example 7 showing the state of the surface layer in the uncured state was measured. Then, it was confirmed that the example was effective.

  In the test method, the test bodies of Examples and Comparative Examples 1 to 7 were produced, each was demolded at the first day of age, and the exposed members of the concrete and the coating agent were applied to the exposed surface of the concrete. It was assumed that the concrete had not been treated, and was then cured in room air until the age of 56 days at an environmental condition of a temperature of 20 ° C. and a relative humidity of 60%.

The evaluation method by this test example performed the surface air permeability test, and compared in each test body (Example, Comparative Examples 1-7).
In the surface air permeability test, as shown in FIG. 3, the compactness after curing of the concrete is evaluated. The surface air permeability test is performed according to the torrent method ("Strong effect of curing condition on air permeability of surface concrete, Concrete" Plant International ”pp 72-76, Phan HDQuoc, T. Kishi, April 2009).

As a result, in the case of the concrete curing structure of the example, the air permeability coefficient is approximately 0.6 × 10 ⁻¹⁶ m ² , which is smaller than Comparative Examples 1 to 6 and Comparative Example 7 to which the coating agent is applied, and has high denseness. It was confirmed.

(Example 2)
Next, as shown in FIG. 4, in the test example 2, the protective effect with respect to the concrete of the concrete curing structure 1 which laminated | stacked the moisture absorption heat generating fiber sheet 11 and the heat insulating material 12 mentioned above was confirmed.
Specifically, in the case of the example shown in Test Example 1 above, Comparative Examples 1 to 6 in which different types of coating agents and coating materials were applied to the concrete surface, and Comparative Example 7 of uncured, The mass change (%) relative to (day) was measured. Here, the mass change indicates the anti-drying performance. The smaller the mass change, the harder it is to dry and the higher the moisture retention, and the larger the mass change, the easier it is to dry and the lower the moisture retention performance.

  As a result, as shown in FIG. 4, in the case of the example, the material age is about −0.05% at 28 days, and Comparative Examples 1 to 7 have a mass change larger than 0.8%. It was confirmed that the mass change was extremely small and the moisture retention performance was excellent.

  As mentioned above, although embodiment of the concrete curing structure and concrete curing method by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.

  For example, in the present embodiment, the hygroscopic heat-generating fiber sheet 11 and the heat insulating material 12 are configured to be bonded by the adhesive material 14 via the aluminum sheet 13, and a fixing method using such an adhesive material 14 is used. However, the adhesive 14 may be omitted or fixed by other fixing means such as an easily detachable adhesive sheet. In short, it is only necessary that the moisture-absorbing exothermic fiber sheet 11 and the heat insulating material 12 are kept fixed and in contact with each other during the curing period.

  Moreover, the aluminum sheet 13 (blocking material) provided on the front and back surfaces of the heat insulating material 12 may be formed in a bag shape, and the heat insulating material 12 may be housed inside thereof. That is, it is also possible to form the whole heat insulating material 12 so as to be covered with the blocking material.

Furthermore, the hygroscopic heat generating fiber sheet 11, the heat insulating material 12, and the aluminum sheet 13 are not limited to being one (one) member, and a plurality of them are combined in accordance with the size and shape of the surface 2a of the concrete 2. You may use it.
In the present embodiment, the moisture supplied to the moisture-absorbing heat generating fiber sheet 11 is generated from the concrete surface 2a. However, heat is generated by supplying moisture from the outside to the concrete surface 2a or the moisture-absorbing heating fiber sheet 11 by some method. You may be prompted.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Concrete curing structure 2 Concrete 2a Concrete surface 11 Hygroscopic exothermic fiber sheet 11a Surface 11b Back surface 12 Heat insulating material 13, 13A, 13B Aluminum sheet (blocking material)
14 Adhesive

Claims (4)

A concrete curing structure arranged to cover the concrete surface after placement,
A moisture-absorbing exothermic fiber sheet laid along the concrete surface and having the property of generating heat in response to moisture;
A heat insulating material provided on the surface side of the moisture-absorbing exothermic fiber sheet;
A blocking material provided along both the front and back surfaces of the heat insulating material and having a characteristic of blocking far-infrared rays,
A concrete curing structure characterized by comprising:   2. The concrete curing structure according to claim 1, wherein the heat insulating material sandwiched from both front and back surfaces by the blocking material and the moisture-absorbing heat generation fiber sheet have a laminated structure bonded by an adhesive. A concrete curing method for curing a concrete surface after placement,
Laying along the concrete surface after placing a hygroscopic exothermic fiber sheet having the property of generating heat in response to moisture;
A step of providing a heat insulating material provided with a blocking material having a property of blocking far infrared rays along both the front and back surfaces, and overlapping the surface side of the moisture-absorbing exothermic fiber sheet;
A concrete curing method characterized by comprising: A concrete curing method for curing a concrete surface after placement,
A step of providing a blocking material having a characteristic of blocking far infrared rays along both the front and back surfaces of the heat insulating material;
A step of providing the heat insulating material provided with the blocking material on the surface side of the moisture-absorbing exothermic fiber sheet having the property of generating heat in response to moisture; and
Laying the hygroscopic exothermic fiber sheet with the heat insulating material along the concrete surface after placement;
A concrete curing method characterized by comprising:

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