JP6166593B2 - Formwork panel for concrete and method for curing concrete - Google Patents

Description

  The present invention relates to a concrete formwork panel and a concrete curing method.

Concrete develops its strength through a chemical reaction between water and cement, called a hydration reaction.
Therefore, in curing the placed concrete, it is important to maintain the wet state of the concrete surface.
Conventionally, as a method of curing while maintaining the wet state of the concrete surface, a technique of spraying water particles on the surface of the placed concrete (see Patent Document 1), or after removing the formwork, the surface of the concrete A technique (see Patent Document 2) is known in which a concrete sheet is covered with a curing sheet and water is supplied to the curing sheet to keep the concrete surface moist via the curing sheet.

However, in the conventional technique for spraying water particles, there is a disadvantage that the cost of the equipment itself is added in addition to the cost of the equipment itself because a large watering equipment is installed, and the work cost for installing and removing the equipment is disadvantageous.
In addition, the conventional technology using a curing sheet requires a curing sheet that is sufficient to cover the surface of the concrete, which is costly, and must be performed after the formwork has been developed and the formwork has been removed. There is a restriction that curing using a curing sheet cannot be performed.

Therefore, the inner surface of the mold body is covered with a water retaining portion made of a material having water permeability or water retention, and the inner surface of the water retaining portion is made of a material that allows water to pass through and inhibits passage of cement particles. There has been proposed a concrete formwork covered with (see Patent Document 3).
In this concrete formwork, after the concrete is placed, the concrete is cured while supplying water to the concrete through the surface part by supplying water to the water retaining part.
Further, a concrete formwork composed of a calcium silicate plate impregnated with water 2.5 to 5.0 times its own weight and containing water with a saturated water content has been proposed (see Patent Document 4).
In this concrete formwork, the concrete is cured while supplying moisture to the concrete cast from the calcium silicate plate.

Japanese Patent Laid-Open No. 7-4030 Japanese Patent Laid-Open No. 10-46816 JP 2010-163785 A JP 2011-196105 A

However, in the thing of patent document 3, a concrete formwork must be manufactured from two materials, the material which has water permeability or water retention, and the material which has water permeability, and suppresses passage of cement particles, The structure of the panel attached to the formwork body is complicated, which is disadvantageous in reducing costs, and because the surface part uses fibers, etc., the entire surface of the finished concrete becomes a fine uneven surface, which is smooth. There is a disadvantage that you cannot get a concrete surface.
Moreover, in the thing of patent document 4, since the calcium silicate board already contains water with a saturated water content at the time of placing concrete, the moisture contained in the concrete tends to be excessive at the initial stage of placing concrete. There is room for improvement in maintaining the hydration reaction between water and cement properly, and there is a disadvantage that air cannot be discharged outside the concrete when placing concrete and a smooth concrete surface cannot be obtained. is there.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a concrete formwork panel and a concrete curing method that are advantageous in increasing the curing effect and improving the quality of concrete while suppressing costs. There is to do.

In order to achieve the above-mentioned object, the present invention is a formwork panel for concrete, which is a calcium silicate plate having air permeability, water permeability and water retention, and one surface in the thickness direction of the calcium silicate plate. An impervious panel made of an impervious material attached to the surface of the calcium silicate plate, and the other side in the thickness direction is air permeable and water permeable so that passage of cement particles is impossible. is formed as the release layer, the remaining portion except for the other surface side is formed as a water flow-water retaining layer having air permeability, water permeability and water retentivity, the surface of the release layer is formed of a smooth surface The release layer is formed by impregnating a water repellent organic solvent on the other surface side in the thickness direction of the calcium silicate plate .
The present invention also relates to a method for curing concrete placed in a concrete formwork in which a plurality of concrete formwork panels are assembled, the concrete formwork panel having air permeability, water permeability and water retention. And a water-impermeable panel made of a water-impermeable material attached to one surface in the thickness direction of the calcium silicate plate, the calcium silicate plate having a thickness The other surface side of the direction is formed as a release layer that has air permeability and water permeability and prevents passage of cement particles, and the remaining portions other than the other surface side have air permeability, water permeability and water retention. It is formed as a water-permeable / water-retaining layer, and the formwork panel for concrete has the calcium silicate plate positioned inside the concrete formwork, and the impermeable panel is made of the concrete formwork. The water-impermeable panel is formed at a height protruding above the upper surface of the calcium silicate plate, and after concrete is placed in the concrete formwork, The upper surface of the concrete and the upper surface of the calcium silicate plate are filled with water at a height lower than that of the water-impermeable panel.
The present invention also relates to a method for curing concrete placed in a concrete formwork in which a plurality of concrete formwork panels are assembled, the concrete formwork panel having air permeability, water permeability and water retention. And a water-impermeable panel made of a water-impermeable material attached to one surface in the thickness direction of the calcium silicate plate, the calcium silicate plate having a thickness The other surface side of the direction is formed as a release layer that has air permeability and water permeability and prevents passage of cement particles, and the remaining portions other than the other surface side have air permeability, water permeability and water retention. It is formed as a water-permeable / water-retaining layer, and the formwork panel for concrete has the calcium silicate plate positioned inside the concrete formwork, and the impermeable panel is made of the concrete formwork. The water supply hose coupling hole is formed on the upper surface of the calcium silicate plate, and concrete is placed in the concrete formwork, and then the water supply hose coupling is arranged. A water supply hose is connected to the hole, and water is supplied to the inside of the calcium silicate plate from the water supply hose coupling hole.

According to the concrete form panel of the present invention, the calcium silicate plate does not contain water with a saturated water content as in the prior art. The moisture contained in the concrete is not excessive at the initial stage when the concrete is placed by being discharged through the calcium plate.
Therefore, since the concrete can be kept in an appropriate wet state through the calcium silicate plate from the initial stage when the concrete is placed until the strength of the concrete is developed, the curing effect of the concrete is enhanced, This is advantageous in improving quality.
Further, in the formwork panel for concrete according to the present invention, the structure having air permeability, water permeability and water retention of the calcium silicate plate is used, and the peel layer and the air permeability, water permeability / water retention are changed by changing the structure. The two layers having different properties are formed, and the two layers are easily formed.
Therefore, the calcium silicate plate to be attached to the water-impermeable panel is made up of two materials, a material having water permeability and water retention as in the prior art, and a material having water permeability and inhibiting the passage of cement particles. Since it is simply constituted by a single member without being combined, it is advantageous in simplifying the structure of the concrete formwork panel and reducing the cost.
Further, the surface of the calcium silicate plate can be easily finished into a smooth surface, which is advantageous in obtaining a smooth concrete surface.
In addition, since both the release layer and the water / water retaining layer have air permeability, it is advantageous for discharging the air mixed in the concrete during concrete placement to the outside of the concrete, and for obtaining a smooth concrete surface. It will be advantageous.
Further, according to the concrete curing method of the present invention, the concrete can be efficiently cured by a simple structure in which the impervious panel protrudes above the upper surface of the calcium silicate plate, and the cost of the curing process can be reduced. This is advantageous in obtaining a high-quality concrete structure while achieving reduction.
In addition, according to the concrete curing method of the present invention, the concrete can be efficiently wet-cured with a simple structure in which a hole is made in the upper surface of the calcium silicate plate, and high quality while reducing costs in the curing process. This is advantageous in obtaining a concrete structure.

It is a longitudinal cross-sectional view which shows the state by which concrete was laid in the concrete formwork using the formwork panel for concrete of 1st Embodiment. It is sectional drawing of a calcium silicate board. It is a longitudinal cross-sectional view which shows the state by which concrete was laid in the concrete formwork using the formwork panel for concrete of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the state by which concrete was laid in the concrete formwork using the formwork panel for concrete of 3rd Embodiment.

(First embodiment)
Next, a concrete formwork using the concrete formwork panel according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the present embodiment, a case will be described in which a concrete form 2 is a concrete structure including a rectangular plate-like wall portion 4 that stands up from a ground surface G.
The concrete formwork 2 is configured by assembling four concrete formwork panels 10 erected from the ground surface G.
Of the four concrete form panels 10, the pair of concrete form panels 10 face each other at an interval in the thickness direction of the wall portion 4 and have a rectangular plate shape.
Of the four concrete form panels 10, the remaining pair of concrete form panels are opposed to each other with an interval in the width direction of the wall 4 (not shown), and have a rectangular plate shape.

The concrete formwork panel 10 includes a calcium silicate plate 12 and an impermeable panel 14, and the impermeable panel 14 is attached to one surface of the calcium silicate plate 12 in the thickness direction.
The calcium silicate plate 12 is located inside the concrete mold 2, and the water-impermeable panel 14 is arranged outside the concrete mold 2.

The water-impermeable panel 14 is made of a water-impermeable material. The water-impermeable panel 14 is made of wood, steel, FRP (made of fiber reinforced plastic) having sufficient strength and rigidity to support the placed concrete 6. Various conventionally known panels such as these panels can be used.
In the present embodiment, as shown in FIG. 1, the impermeable panel 14 has a rectangular plate shape having the same width and the same height as the calcium silicate plate 12.
In addition, a plurality of drain holes 16 are provided at locations near the lower surface of the water-impermeable panel 14 at intervals in the width direction.

The calcium silicate plate 12 is formed mainly of a calcareous raw material, a siliceous raw material, a reinforcing fiber, etc., has a rectangular plate shape, and has air permeability, water permeability and water retention.
The calcium silicate plate 12 is formed on the other surface side in the thickness direction located inside the concrete mold 2 as a release layer 12A that has air permeability and water permeability and prevents passage of cement particles. The remaining part except the surface side is formed as a water / water retaining layer 12B having air permeability, water permeability and water retention.
The peeling layer 12 </ b> A smoothly peels the other surface of the calcium silicate plate 12 from the concrete 6 when the concrete mold 2 is removed after the concrete 6 is hardened.
Further, when the concrete 6 is placed inside the concrete mold 2, the release layer 12 </ b> A guides excess moisture of the concrete 6 to the water flow / water retention layer 12 </ b> B and guides air mixed in the concrete 6 to the outside of the concrete. Is.
Further, the release layer 12 </ b> A wets the concrete 6 with water supplied to the water flow / water retention layer 12 </ b> B in the curing process of the concrete 6.
The surface of the calcium silicate plate 12 in contact with the concrete 6 can be easily smoothed by smoothing the surface of the mold for producing the calcium silicate plate 12, or the surface of the calcium silicate plate 12 is polished. Can be easily smoothed. Therefore, the surface of the concrete manufactured by the concrete mold 2 can be easily and reliably made a smooth surface.
The water / water retaining layer 12B functions as a water channel that discharges excess water of the concrete 6 guided from the release layer 12A to the outside through the plurality of drain holes 16 of the water-impermeable panel 14 when the concrete 6 is placed. Moreover, it functions as an air passage for guiding the air mixed in the concrete 6 to the outside of the concrete form panel 10.
Further, the water flow / water retention layer 12B functions as a water flow path for wetting the concrete 6 through the release layer 12A in the curing process of the concrete 6.

As shown in FIG. 2, the release layer 12 </ b> A is easily formed by setting the density of the calcium silicate on the other surface side to be higher than the density of the calcium silicate plate 12 excluding the other surface side. Can do.
Alternatively, the release layer 12A can be easily formed by impregnating the water repellent organic solvent on the other surface side in the thickness direction of the calcium silicate plate 12.
As the water-repellent organic solvent, various conventionally known solvents such as fats and oils, silicon and fluorine can be used.
That is, in the present embodiment, the properties of the release layer 12A and the water / water retention layer 12B are changed by utilizing the structure of the calcium silicate plate 12 having air permeability, water permeability, and water retention, and changing the structure. Two different layers are formed, and the formation of the two layers is simplified.

Next, the effect of the concrete formwork panel 10 will be described.
Concrete 6 is placed inside the concrete formwork 2.
The concrete 6 is placed to the same height as the top surfaces of the calcium silicate plate 12 and the water-impermeable panel 14.
The surplus moisture of the concrete 6 placed inside the concrete mold 2 reaches the water passing / water retaining layer 12B from the peeling layer 12A, is discharged from the plurality of drain holes 16 of the water-impermeable panel 14, and is mixed into the concrete 6 The discharged air is discharged out of the concrete mold 2.
Therefore, since the surplus moisture of the placed concrete 6 is efficiently drained, it is advantageous in holding the moisture contained in the concrete 6 to the moisture necessary for promoting the hydration reaction of the concrete 6, This is advantageous in obtaining a smooth concrete 6 surface.

After the concrete 6 is placed and left for a predetermined time (for example, one day), if the concrete 6 is hardened by the hydration reaction of the concrete 6, the top surface 602 of the concrete 6 and the top surface 1202 of the calcium silicate plate 12 are applied. Apply water.
The water hung on the upper surface 602 of the concrete 6 and the upper surface 1202 of the calcium silicate plate 12 wets the concrete 6 from the upper surface 602 of the concrete 6 and lowers the calcium silicate plate 12 from the upper surface 1202 of the calcium silicate plate 12. The concrete 6 is wetted from the side surface through the release layer 12A.
The supply of water to the upper surface 602 of the concrete 6 and the upper surface 1202 of the calcium silicate plate 12 is performed so that the concrete 6 is kept wet and the concrete 6 is not excessively wetted.
Therefore, since moisture is replenished from the side surface of the placed concrete 6 via the calcium silicate plate 12, the moisture contained in the concrete 6 is necessary to promote the hydration reaction of the concrete 6. This is advantageous in maintaining moisture.
If the strength of the concrete 6 is expressed by performing wet curing of the concrete 6 placed in this way for a predetermined period (for example, one week), the upper surface 602 of the concrete 6 and the upper surface of the calcium silicate plate 12. The supply of water to 1202 is terminated, and the concrete mold 2 is removed to obtain the wall 4 as a concrete structure.

According to the present embodiment, since the calcium silicate plate 12 does not contain water having a saturated water content as in the prior art, the excess moisture of the concrete 6 is calcium silicate at the initial stage when the concrete 6 is placed. The moisture contained in the concrete 6 does not become excessive at the initial stage of being discharged through the plate 12 and placing the concrete 6.
That is, at the initial stage when the concrete 6 is placed on the concrete mold 2, the excess water contained in the concrete 6 is appropriately discharged through the calcium silicate plate 12, and after the excess water of the concrete 6 is discharged. Water is supplied to the concrete 6 through the calcium silicate plate 12.
Therefore, since the concrete 6 can be kept in an appropriate wet state through the calcium silicate plate 12 from the initial stage when the concrete 6 is placed until the strength of the concrete 6 is expressed, the curing effect of the concrete 6 is achieved. This is advantageous in improving the quality of the concrete 6.

In the present embodiment, two layers having different properties are formed by utilizing the structure of the calcium silicate plate 12 having air permeability, water permeability, and water retention, and changing the structure. The formation of two layers is simplified.
In other words, the peeling layer 12A and the water / water retaining layer 12B are simply formed on the single calcium silicate plate 12.
Therefore, the calcium silicate plate 12 attached to the water-impermeable panel 14 is divided into two materials, a material having water permeability and water retention as in the prior art, and a material having water permeability and preventing passage of cement particles. It is simply configured with a single member without combining materials.
Therefore, it is advantageous in simplifying the structure of the concrete formwork panel 10 and reducing the cost of the concrete formwork 2.
Further, the surface of the calcium silicate plate 12 can be easily finished into a smooth surface, which is advantageous for obtaining a smooth concrete 6 surface.
Moreover, since both the peeling layer 12A and the water / water retaining layer 12B have air permeability, it is advantageous in discharging air mixed into the concrete 6 when the concrete is placed to the outside of the concrete 6, and the smooth concrete 6 This is advantageous in obtaining a surface.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.
The second embodiment is different from the first embodiment in that the water-impermeable panel 14 is formed with a height protruding above the upper surface 1202 of the calcium silicate plate 12.
In the following embodiments, the same or similar parts and members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are mainly described.

Also in the second embodiment, the concrete 6 is placed inside the concrete mold 2 as in the first embodiment.
The concrete 6 is placed to the same height as the upper surface 1202 of the calcium silicate plate 12.
By forming the impervious panel 14 at a height that protrudes upward from the upper surface 1202 of the calcium silicate plate 12, the upper surface 602 of the concrete 6 and the upper surface 1202 of the calcium silicate plate 12, and the upper surfaces 602 and 1202 thereof. An open recess 18 is formed on the upper side by the portion of the water-impermeable panel 14 positioned above.
Excess water in the concrete 6 placed in the concrete mold 2 is discharged from the plurality of drain holes 16 of the water-impermeable panel 14 through the calcium silicate plate 12 as in the first embodiment. The
If the concrete 6 is hardened by the hydration reaction of the concrete 6, water is supplied to the recess 18 to fill the recess 18 with water.
As a result, the water filled in the recesses 18 wets the concrete 6 from the upper surface 602 of the concrete 6 as well as the calcium silicate plate 12 from the upper surface 1202 of the calcium silicate plate 12 as in the first embodiment. The concrete 6 is wetted from the side surface through a release layer 12A that penetrates into the lower portion and faces the placed concrete 6.
The water supply to the recess 18 is performed so that the wet state of the concrete 6 is maintained and the concrete 6 is not excessively wetted.
Accordingly, moisture is supplied to the placed concrete 6 through the calcium silicate plate 12, so that the moisture contained in the concrete 6 is held at the moisture necessary for promoting the hydration reaction of the concrete 6. This is advantageous.
If the strength of the concrete 6 is expressed by performing wet curing of the concrete 6 placed in this way for a predetermined period, the supply of water to the recess 18 is terminated, and the concrete mold 2 Is removed to obtain the wall 4 as a concrete structure.

In the second embodiment, the same effect as that of the first embodiment can be obtained.
Further, in the first embodiment, water is permeated through the upper surface 1202 of the calcium silicate plate 12, whereas in the second embodiment, the inner side of the upper portion of the impermeable panel 14. A recess 18 that allows water to be stored is formed. Therefore, by filling the recess 18 with water, the water can penetrate into the calcium silicate plate 12 from the upper surface 1202 of the calcium silicate plate 12.
Therefore, it is advantageous for evenly penetrating water from the upper surface 1202 of the calcium silicate plate 12 to the entire calcium silicate plate 12, and more advantageous for efficient wet curing of the concrete 6.
In addition, the above-described effect can be achieved by a simple configuration in which the water-impermeable panel 14 protrudes above the upper surface 1202 of the calcium silicate plate 12, and a high-quality concrete structure is achieved while reducing costs in the curing process. It is advantageous in obtaining.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
The third embodiment is different from the first and second embodiments in that a water supply hose coupling hole 20 is formed in the upper surface 1202 of the calcium silicate plate 12.
As shown in FIG. 4, water supply hose coupling holes 20 extending in the vertical direction are spaced apart in the width direction of the calcium silicate plate 12 on the upper surface 1202 of the calcium silicate plate 12 of each concrete formwork 2 panel. A plurality of them are formed.
The water supply hose coupling hole 20 is excavated using a tool such as an electric drill.
An attachment 22 is attached to an opening near the upper surface 1202 of the calcium silicate plate 12 of each water supply hose coupling hole 20.
The attachment 22 is configured such that the tip of the water supply hose 24 is detachably coupled, and the attachment 22 is attached to the opening of the water supply hose coupling hole 20, whereby the water supply hose coupling hole 20. The opening is closed by the attachment 22.

The concrete 6 is placed in the concrete mold 2 to the same height as the upper surface 1202 of the calcium silicate plate 12.
Excess water in the concrete 6 placed inside the concrete mold 2 is removed from the plurality of drain holes 16 of the water-impermeable panel 14 via the calcium silicate plate 12 as in the first and second embodiments. Discharged from.
When the concrete 6 is hardened by the hydration reaction of the concrete 6, the tip of the water supply hose 24 is connected to each attachment 22, and water is injected into the water supply hose connection hole 20 through each water supply hose 24. To do.
The water injected into each water supply hose coupling hole 20 is supplied to the inside of the calcium silicate plate 12, penetrates from the top to the bottom of the calcium silicate plate 12, and peels away from the placed concrete 6. Wet the concrete 6 through the layer 12A.
Water is injected into each water supply hose coupling hole 20 so that the moisture contained in the concrete 6 does not become excessive or deficient with respect to the moisture necessary for promoting the hydration reaction of the concrete 6.
Accordingly, moisture is supplied to the placed concrete 6 through the calcium silicate plate 12, so that the moisture contained in the concrete 6 is held at the moisture necessary for promoting the hydration reaction of the concrete 6. This is advantageous.
If the strength of the concrete 6 is expressed by performing wet curing of the concrete 6 placed in this way for a predetermined period, the supply of water to the recess 18 is terminated, and the concrete mold 2 Is removed to obtain the wall 4 as a concrete structure.

In the third embodiment, the same effect as that of the first embodiment can be obtained.
In the first and second embodiments, water is infiltrated from the upper surface 1202 of the calcium silicate plate 12, whereas in the third embodiment, the water hose coupling hole 20 is connected to the silica. Water was supplied into the calcium oxide plate 12.
Therefore, it is more advantageous to rapidly infiltrate the water uniformly throughout the calcium silicate plate 12, and more advantageous to efficiently wet curing the concrete 6.
In addition, the structure having water permeability and water retention of the calcium silicate plate 12 is utilized, and the above effect can be achieved by a simple configuration in which the hole 20 is simply formed in the upper surface 1202 of the calcium silicate plate 12, and the curing is achieved. This is advantageous in obtaining a high-quality concrete structure while reducing costs in the process.

  2 ... Concrete formwork, 4 ... Wall, 6 ... Concrete, 602 ... Top, 10 ... Concrete formwork panel, 12 ... Calcium silicate board, 12A ... Peeling layer, 12B ... Through Water / water retaining layer, 1202... Upper surface, 14... Impervious panel, 20 .. water supply hose coupling hole, 24.

Claims (5)

A formwork panel for concrete,
A calcium silicate plate having air permeability, water permeability and water retention;
An impermeable panel made of an impermeable material attached to one surface in the thickness direction of the calcium silicate plate;
The calcium silicate plate is formed as a peeled layer in which the other surface side in the thickness direction has air permeability and water permeability and cannot pass cement particles, and the remaining portions other than the other surface side are, Formed as a water-permeable / water-retaining layer with breathability, water permeability and water retention,
The release layer has a smooth surface ,
The release layer is formed by impregnating a water repellent organic solvent on the other surface side in the thickness direction of the calcium silicate plate.
A concrete formwork panel characterized by that. The water-impermeable panel is formed at a height protruding upward from the upper surface of the calcium silicate plate.
Claim 1 Symbol placement for concrete formwork panels, characterized in that. On the upper surface of the calcium silicate plate, a hole for water supply hose coupling is formed,
The formwork panel for concrete according to claim 1 or 2 . A method for curing concrete placed in a concrete formwork in which a plurality of formwork panels for concrete are assembled,
The formwork panel for concrete is a water-impermeable material made of a calcium silicate plate having air permeability, water permeability and water retention, and a water-impermeable material attached to one surface in the thickness direction of the calcium silicate plate. With a sex panel,
The calcium silicate plate is formed as a peeled layer in which the other surface side in the thickness direction has air permeability and water permeability and cannot pass cement particles, and the remaining portions other than the other surface side are, Formed as a water-permeable / water-retaining layer with breathability, water permeability and water retention,
The concrete formwork panel is arranged such that the calcium silicate plate is located inside the concrete formwork and the impermeable panel is located outside the concrete formwork,
The water-impermeable panel is formed at a height protruding above the upper surface of the calcium silicate plate,
After the concrete was placed in the concrete formwork, the upper surface of the concrete and the upper surface of the calcium silicate plate were filled with water at a height lower than the water-impermeable panel.
Concrete curing method characterized by the above. A method for curing concrete placed in a concrete formwork in which a plurality of formwork panels for concrete are assembled,
The formwork panel for concrete is a water-impermeable material made of a calcium silicate plate having air permeability, water permeability and water retention, and a water-impermeable material attached to one surface in the thickness direction of the calcium silicate plate. With a sex panel,
The calcium silicate plate is formed as a peeled layer in which the other surface side in the thickness direction has air permeability and water permeability and cannot pass cement particles, and the remaining portions other than the other surface side are, Formed as a water-permeable / water-retaining layer with breathability, water permeability and water retention,
The concrete formwork panel is arranged such that the calcium silicate plate is located inside the concrete formwork and the impermeable panel is located outside the concrete formwork,
On the upper surface of the calcium silicate plate, a hole for water supply hose coupling is formed,
After the concrete is placed in the concrete formwork, a water supply hose is connected to the hole for connecting the water supply hose, and water is supplied from the water supply hose connection hole to the inside of the calcium silicate plate. ,
Concrete curing method characterized by the above.

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