JP2014152560A - Concrete curing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable possession of heat shield properties while securing persistence of a water retention effect.SOLUTION: Characteristically, a concrete curing sheet 1 has a water retentive layer 2 and a heat shielding layer 3, and the water retentive layer 2 and the heat shielding layer 3 are integrated together.

Description

  The present invention relates to a concrete curing sheet used when curing concrete placed on site.

  Generally, in concrete construction, in order to ensure the required quality of concrete such as strength, durability, water tightness, etc., it is necessary to perform so-called curing to maintain the temperature and humidity necessary for curing for a certain period of time after placing the concrete. .

  There are various curing methods, such as water spraying on the concrete surface, poultice curing to cover the concrete surface with rather wet, etc., submerged curing to create a weir to collect water, and curing method to wrap the concrete surface There is a curing method for covering the concrete surface with a blue sheet (prior art 1).

  Also known is a curing method in which a sponge mat is laid on the concrete surface to spray water (Prior Art 2).

  Further, for example, in Patent Document 1, as a concrete curing sheet for replenishing the reduced amount of water on the concrete surface, a wetting material that swells by absorbing water is formed into a protrusion and integrally provided on the base sheet. Is disclosed (prior art 3).

  Further, for example, Patent Document 2 discloses a concrete curing sheet in which a moisture retaining sheet containing a wetting material that swells by absorbing water and a heat retaining sheet made of a heat insulating material are integrated in a laminated state (prior art). 4).

  Furthermore, for example, Patent Document 3 discloses a concrete curing sheet comprising a heat insulating mat for encapsulating a heat insulating member with a waterproof sheet and a wetting mat provided on one surface of the heat insulating mat (conventional technology). Technology 5).

Japanese Patent No. 3754284 JP 2010-196396 A JP-A-6-285832

  However, in the prior arts 1 and 2, it is difficult to sufficiently maintain the water retaining effect on the concrete surface, and the concrete is directly affected by the outside air temperature and solar radiation, so it is maintained in an appropriate temperature range. It may not be possible.

  Moreover, in the above prior art 3, since the wetting material is provided, the water retention effect is maintained, but since there is no heat insulation action, the temperature change of the concrete surface increases due to the influence of outside air temperature and solar radiation, and it is maintained in an appropriate temperature range. May not be possible.

  Moreover, in the above-mentioned prior art 4, since it has a moisturizing sheet and a heat retaining sheet, the water retaining effect is maintained and the influence of the outside air temperature is considered to be reduced to some extent, but in a strong solar radiation environment such as under hot weather in summer It may not be possible to maintain the proper temperature range.

  Moreover, in the said prior art 5, since it has the heat insulation mat and the wet mat, it is thought that the water retention effect is maintained and the influence of the outside air temperature can be reduced to some extent. In this case, it may not be possible to maintain an appropriate temperature range.

  This invention is made | formed in view of this point, The place made into the objective is to enable it to also have heat-shielding property, ensuring the sustainability of a water retention effect.

In order to achieve the above object, the first invention comprises a water retention layer,
A heat insulating layer that reflects heat, and the water retaining layer and the heat insulating layer are integrated.

  According to this configuration, it is possible to supply moisture to the concrete surface with the water retained by the water retention layer, so that the wet state of the concrete surface can be sufficiently maintained. Furthermore, since the heat shield layer reflects the heat of sunlight under the hot sun, the temperature rise of the water retaining layer on the concrete surface side is suppressed. As a result, it is possible to suppress the temperature rise of the concrete and keep it in an appropriate temperature range.

According to a second invention, in the first invention,
A concave portion is formed in the heat shield layer.

  According to this structure, it becomes possible to accumulate water in the recessed part of a thermal-insulation layer, and the water collected in the recessed part gradually evaporates. Since the heat of the water retaining layer is taken away by the heat of vaporization at this time, it is possible to effectively suppress the temperature rise of the concrete curing surface. Furthermore, since the water accumulated in the concave portion also acts as a heat insulating layer, it is difficult for external heat to be transferred to the concrete at a high outside air temperature. That is, since the heat shield layer has three effects of heat shield, heat insulation, and heat dissipation, it is possible to effectively suppress the temperature rise of the concrete curing surface.

  In addition, when the temperature is lowered at night, the temperature of the concrete curing surface is prevented from being lowered more than necessary by the heat insulating effect of the water in the recess, so that the quality is not deteriorated.

  Furthermore, when sunlight is reflected by the heat shield layer, the sun light is irregularly reflected by the presence of the recess in the heat shield layer, thereby reducing the glare felt by workers working around. Is possible.

According to a third invention, in the first invention,
The heat shield layer has a convex portion.

  According to this configuration, when the sunlight is reflected by the heat shielding layer, the sunlight is irregularly reflected due to the convex portion on the heat shielding layer, thereby making the glare felt by the worker working in the surroundings. It becomes possible to reduce.

According to a fourth invention, in any one of the first to third inventions,
A heat insulating layer is provided between the water retaining layer and the heat shielding layer,
The water retention layer, the heat insulating layer, and the heat shielding layer are laminated and integrated.

  According to this configuration, since the change in the outside air temperature does not directly act on the concrete, the temperature of the concrete can be maintained in an appropriate range.

  According to the first aspect of the present invention, since the water retaining layer and the heat shielding layer that reflects heat can be provided, it is possible to provide heat insulation while ensuring the durability of the wetting effect. Thereafter, the temperature and humidity can be kept in appropriate ranges for a certain period of time.

  According to the second invention, since the recess is formed in the heat shield layer, the heat shield layer exhibits three effects of heat shield, heat insulation, and heat dissipation by accumulating water in the recess. Thereby, the temperature rise of a concrete curing surface can be suppressed effectively. Moreover, the glare which a surrounding worker feels when reflecting sunlight can also be reduced.

  According to the third aspect, since the convex portion is formed on the heat shield layer, it is possible to reduce the glare felt by surrounding workers when reflecting sunlight.

  According to the fourth aspect, since the heat insulating layer is provided between the water retaining layer and the heat shielding layer, the temperature of the concrete can be maintained in an appropriate range.

It is a top view of the concrete curing sheet which concerns on Embodiment 1. FIG. It is II-II sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 2. FIG. It is IV-IV sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 3. FIG. It is VI-VI sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 4. FIG. It is VIII-VIII sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 5. FIG. It is XX sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 6. FIG. It is XII-XII sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 7. FIG. It is XIV-XIV sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 8. FIG. It is XVI-XVI sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 9. FIG. It is XVIII-XVIII sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 10. FIG. It is XX-XX sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 11. FIG. It is XXII-XXII sectional drawing of FIG. It is a top view of the concrete curing sheet which concerns on Embodiment 12. It is XXIV-XXIV sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 1 is a plan view of a concrete curing sheet 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the concrete curing sheet 1 according to the first embodiment. The concrete curing sheet 1 is suitable, for example, when curing a general concrete structure such as a concrete dam, a bridge slab, or a pier.

  What is necessary is just to set the width | variety of the concrete curing sheet 1 in consideration of the ease of handling in the field, for example, about 1 m is preferable. The length of the concrete curing sheet 1 is preferably about 20 m, for example.

  The concrete curing sheet 1 has a two-layer structure. That is, the concrete curing sheet 1 includes a water retention layer 2 located on the back surface (surface that contacts the concrete) side of the sheet 1 and a heat shield layer 3 located on the surface side of the sheet 1. The heat shield layer 3 is laminated and integrated.

  The water retention layer 2 is not particularly limited as long as it can retain water. For example, microfibers, sponges, non-woven fabrics and woven fabrics made of synthetic fibers, and polymer water absorption using these as base materials Those in which a body is fixed, or those in which a polymer water absorber is integrated with fibers can be used. Moreover, as said nonwoven fabric, it is preferable to use polyester, an acrylic rayon nonwoven fabric, etc. Further, the water retention layer 2 may be a combination of the above-described examples. The water retaining layer 2 has a property that water held by itself can be gradually supplied to the concrete surface to stably maintain the wet state of the concrete surface for a long time.

  Examples of the polymer water absorber include polyacrylic acid type such as sodium polyacrylate and cellulose type such as carboxymethylcellulose. In addition, rubber-based materials such as chloroprene rubber or hypalon rubber, polyvinyl chloride-based materials, polyurethane-based two-component reactive types, and moisture-curable types can be used.

  The heat-shielding layer 3 may be made of a material that reflects heat, for example, a metal-based foil such as aluminum, stainless steel, nickel, silver, or copper, or a metal-based reflective material vapor-deposited film in which these metals are vapor-deposited, Alternatively, it is possible to use a non-metallic reflective material vapor deposition film or a woven fabric obtained by vapor deposition of titanium oxide other than metal, ceramic powder or the like. Since the metal type may be eluted with alkaline water of concrete, it is preferable to prevent the alkaline water from contacting the metal by coating the outer surface with a synthetic resin film such as polyester or polyethylene.

  The water retention layer 2 and the heat shielding layer 3 are integrated in a laminated state by a technique such as adhesion using an adhesive or heat welding. The water retaining layer 2 and the heat shielding layer 3 can be laminated.

  The heat shield layer 3 is preferably impermeable to water. When the heat shielding layer 3 is water permeable, it is preferable to interpose a water-impermeable film (sheet, film, etc.) between the water retaining layer 2 and the heat shielding layer 3. As the water-impermeable film, a synthetic resin film such as a polyethylene film and other various membranes can be used. By adopting such a structure, it is possible to prevent the moisture of the water retention layer 2 from escaping from the heat shielding layer 3 side.

  Next, the case where the said concrete curing sheet 1 is used is demonstrated. The water retention layer 2 of the concrete curing sheet 1 absorbs water in advance. After the concrete is driven in the construction site of the concrete structure, the concrete curing sheet 1 is laid so that the water retaining layer 2 is in contact with the concrete surface.

  Since the moisture of the water retaining layer 2 replenishes the amount of water reduced on the concrete surface, the concrete can be kept in a wet state.

  At this time, since sunlight is reflected by the heat shield layer 3, the temperature increase of the water retention layer 2 is suppressed, and as a result, the temperature increase of the concrete curing surface is suppressed.

  Further, when a water-impermeable film is provided between the water retaining layer 2 and the heat shielding layer 3 of the concrete curing sheet 1, the water of the water retaining layer 2 reaches the heat shielding layer 3 side and is dissipated. The concrete can be kept moist even under hot weather.

  As described above, according to the concrete curing sheet 1 according to the first embodiment, since the water retaining layer 2 and the heat shielding layer 3 are provided, the heat retaining property is maintained while maintaining the water retaining effect. Therefore, the temperature and the humidity can be maintained within an appropriate range for a certain period after the concrete is placed.

  Although not shown, a heat insulating layer may be provided between the water retaining layer 2 and the heat shielding layer 3. In this case, by providing a heat insulating layer, a higher heat insulating property can be provided. For example, when the temperature is low, a heat retaining effect is exhibited, which is suitable for use in winter. As the heat insulating layer, flexible resin foams such as flexible polyethylene foam, urethane foam, and polyurethane foam are preferable. By using a soft resin foam, it is easy to form a roll when transporting or storing the concrete curing sheet 1.

(Embodiment 2)
3 and 4 show a concrete curing sheet 1 according to Embodiment 2 of the present invention. The concrete curing sheet 1 of the second embodiment is different from that of the first embodiment in that a concave portion 3a and a convex portion 3b are formed in the heat shielding layer 3, and the other portions are the same as in the first embodiment. Therefore, hereinafter, different parts from the first embodiment will be described in detail.

  The heat shield layer 3 is formed with a large number of recesses 3a spaced vertically and horizontally when viewed from the front side in a plan view, that is, when laid on concrete. The shape of the recess 3a is substantially square in the second embodiment, and the entire depth of the recess 3a is substantially the same, for example, about 1 mm to 10 mm. The depth of the recess 3a is preferably set to such an extent that water accumulates in the recess 3a, and may be outside the above range. The size of the recess 3a is set to a width of about 10 mm to 50 mm.

  As a method of forming the recess 3a, in this embodiment, the surface of the heat shield layer 3 is recessed to form a thin portion in the heat shield layer 3, and the recess 3a is configured by this thin portion. Therefore, the back surface (surface on the water retaining layer 2 side) of the heat shield layer 3 is flat.

  On the surface of the heat shield layer 3, convex portions 3 b are formed in portions other than the concave portions 3 a. Therefore, the convex part 3b is formed in the whole circumference | surroundings of the recessed part 3a.

  According to the concrete curing sheet 1 of the second embodiment, since the water retaining layer 2 and the heat shielding layer 3 are provided as in the first embodiment, the temperature and the humidity are within an appropriate range for a certain period after the concrete is placed. Can be kept in. In addition to this, the following effects can also be achieved.

  That is, if water is sprayed on the heat shield layer 3 after the concrete curing sheet 1 is laid, the water will accumulate in the recess 3a. The water accumulated in the recesses 3a gradually evaporates, and the heat of the water retaining layer 2 is taken away by the heat of vaporization at this time, so that it is possible to suppress the temperature rise of the concrete curing surface. Furthermore, since the water accumulated in the recess 3a also acts as a heat insulating layer, it is difficult for external heat to be transmitted to the concrete at a high outside temperature. That is, the heat shield layer 3 having the recesses 3a has three effects of heat shield, heat insulation, and heat dissipation, and therefore it is possible to effectively suppress the temperature rise of the concrete curing surface.

  Further, in the case where the temperature is lowered at night, the temperature of the concrete curing surface is prevented from being lowered more than necessary by the heat insulating effect of the water in the recess 3a of the heat shield layer 3, so that the quality is not deteriorated. .

  Further, when sunlight is reflected by the heat shield layer 3, the sun light is irregularly reflected by the presence of the concave portions 3a and the convex portions 3b in the heat shield layer 3, so that an operator working around It becomes possible to reduce the glare to feel.

(Embodiment 3)
5 and 6 show a concrete curing sheet 1 according to Embodiment 3 of the present invention. The concrete curing sheet 1 of the third embodiment is different from that of the second embodiment in the shape of the concave portion 3a and the convex portion 3b of the heat shielding layer 3, and the other portions are the same as in the second embodiment. Hereinafter, a different part from Embodiment 2 is demonstrated in detail.

  The shape of the recess 3a is circular. Moreover, the convex part 3b is formed in the whole circumference | surroundings of the recessed part 3a.

  According to the concrete curing sheet 1 of the third embodiment, the same effects as those of the second embodiment can be achieved.

(Embodiment 4)
7 and 8 show a concrete curing sheet 1 according to Embodiment 4 of the present invention. The concrete curing sheet 1 of the fourth embodiment is different from that of the second embodiment in the shape of the concave portions 3a and the convex portions 3b of the heat shield layer 3, and the other portions are the same as those of the second embodiment. Hereinafter, a different part from Embodiment 2 is demonstrated in detail.

  The shape of the recess 3a is substantially square in plan view. The bottom surface of the recess 3a is configured by combining a plurality of flat surfaces, and is inclined downward from the peripheral edge portion of the bottom surface toward the center portion so that the center portion of the bottom surface is deepest. Moreover, the convex part 3b is formed between the adjacent recessed parts 3a, and the convex part 3b is comprised by the some plane inclined so that a cross section might become a mountain shape.

  According to the concrete curing sheet 1 of the fourth embodiment, the same operational effects as those of the second embodiment can be obtained, and the concave portion 3a and the convex portion 3b are configured by a plurality of planes having different angles. Light becomes diffusely reflected, and dazzling can be further reduced.

(Embodiment 5)
9 and 10 show a concrete curing sheet 1 according to Embodiment 5 of the present invention. The concrete curing sheet 1 of the fifth embodiment is different from that of the third embodiment in the shape of the recess 3a of the heat shield layer 3, and the other parts are the same as those in the third embodiment. A different part from 3 is demonstrated in detail.

  The shape of the recess 3a is circular in a plan view as in the third embodiment, but the bottom surface is flat in the third embodiment, whereas in the fifth embodiment, the central portion is curved to be deepest. .

  According to the concrete curing sheet 1 of the fifth embodiment, the same effects as those of the third embodiment can be obtained, and the concave portion 3a is curved, so that sunlight is easily diffused and the glare is further increased. It can be further reduced.

(Embodiment 6)
11 and 12 show a concrete curing sheet 1 according to Embodiment 6 of the present invention. The concrete curing sheet 1 of this sixth embodiment is different from that of the second embodiment in the shape of the recess 3a of the heat shield layer 3, and the other parts are the same as in the second embodiment. A different part from 2 is demonstrated in detail.

  The shape of the recess 3a is substantially square in plan view. The four side surfaces of each recess 3a are inclined in a direction approaching the center of the bottom surface as it approaches the bottom surface of the recess 3a.

  According to the concrete curing sheet 1 of the sixth embodiment, the same operational effects as those of the second embodiment can be obtained, and the side surfaces of the recesses 3a are inclined so that sunlight is easily diffused and dazzled. Can be further reduced.

(Embodiment 7)
13 and 14 show a concrete curing sheet 1 according to Embodiment 7 of the present invention. The concrete curing sheet 1 of the seventh embodiment is different from that of the third embodiment in the shape of the recess 3a of the heat shield layer 3, and the other parts are the same as those in the third embodiment. A different part from 3 is demonstrated in detail.

  The shape of the recess 3a is circular in plan view. The peripheral surface of the recess 3a is inclined in a direction approaching the center of the bottom as it approaches the bottom of the recess 3a.

  According to the concrete curing sheet 1 of the seventh embodiment, the same operational effects as in the third embodiment can be obtained, and the peripheral surface of the recess 3a is inclined, so that sunlight is easily diffused and dazzled. This can be further reduced.

(Embodiment 8)
15 and 16 show a concrete curing sheet 1 according to Embodiment 8 of the present invention. The concrete curing sheet 1 of this eighth embodiment is different from that of the second embodiment in the formation pattern of the concave portions 3a of the heat shield layer 3 and the shape of the convex portions 3b, and the other portions are the same as in the second embodiment. Thus, the following description will be made in detail on the parts different from the second embodiment.

  The shape of the recess 3a is square in plan view. The recesses 3a are arranged in a straight line in the longitudinal direction of the concrete curing sheet 1 (vertical direction in FIG. 15). On the other hand, the recesses 3a arranged in the width direction (left-right direction in FIG. 15) are not linear, but are shifted in the longitudinal direction. The convex part 3b is formed in the whole circumference | surroundings of the recessed part 3a.

  According to the concrete curing sheet 1 of the eighth embodiment, the same effects as those of the second embodiment can be achieved.

(Embodiment 9)
17 and 18 show a concrete curing sheet 1 according to Embodiment 9 of the present invention. The concrete curing sheet 1 of this ninth embodiment is different from that of the second embodiment in the shape of the concave portions 3a and the convex portions 3b of the heat shield layer 3, and the other portions are the same as in the second embodiment. Hereinafter, a different part from Embodiment 2 is demonstrated in detail.

  The shape of the recess 3a is a rectangle that is long in the longitudinal direction (vertical direction in FIG. 17) of the concrete curing sheet 1 in plan view. Moreover, the convex part 3b is formed in the whole circumference | surroundings of the recessed part 3a.

  According to the concrete curing sheet 1 of the ninth embodiment, the same effects as those of the second embodiment can be achieved.

(Embodiment 10)
19 and 20 show a concrete curing sheet 1 according to Embodiment 10 of the present invention. The concrete curing sheet 1 of the tenth embodiment is the same as that of the second embodiment except that the relationship between the concave portions 3a and the convex portions 3b of the heat shield layer 3 is reversed. Therefore, the parts different from the second embodiment will be described in detail below.

  The shape of the convex portion 3 b is a square, and is formed with a space in the vertical and horizontal directions of the heat shield layer 3. The concave portion 3a is a portion other than the convex portion 3b on the surface of the heat shield layer 3, and becomes a lattice-like groove as a whole.

  Further, on both sides in the width direction on the front side of the heat shield layer 3, ridges 3e and 3e extending in the longitudinal direction of the concrete curing sheet 1 are formed, respectively. By providing the protrusions 3e and 3e, it is possible to suppress the water in the recess 3a from flowing down from the surface of the heat shield layer 3.

  The water accumulated in the recess 3a is a groove in which the recess 3a is continuous, and therefore easily spreads to each part of the heat shield layer 3.

  According to the concrete curing sheet 1 of the tenth embodiment, the same operational effects as those of the second embodiment can be obtained, and since the concave portion 3a is a groove, the water accumulated in the concave portion 3a The temperature can be spread over a wide range.

(Embodiment 11)
FIG.21 and FIG.22 shows the concrete curing sheet 1 which concerns on Embodiment 11 of this invention. The concrete curing sheet 1 according to the eleventh embodiment is different from that according to the second embodiment in that a heat insulating layer 4 is provided, and other parts are the same as those in the second embodiment. Different parts will be described in detail.

  The heat insulating layer 4 is provided between the water retaining layer 2 and the heat shielding layer 3. The heat insulating layer 4 is preferably a soft resin foam such as flexible polyethylene foam, urethane foam, or polyurethane foam. By using a soft resin foam, it is easy to form a roll when transporting or storing the concrete curing sheet 1.

  By providing the heat insulating layer 4, it is possible to provide higher heat insulating properties. For example, when the temperature is low, the heat insulating effect is exhibited, so that it is suitable for use in winter.

  According to the concrete curing sheet 1 of the eleventh embodiment, the same effects as those of the second embodiment can be achieved, high heat insulation can be provided, and quality deterioration can be prevented even in winter.

Embodiment 12
FIG.23 and FIG.24 shows the concrete curing sheet 1 which concerns on Embodiment 12 of this invention. The concrete curing sheet 1 of the twelfth embodiment is different from that of the second embodiment in the formation method of the concave portions 3a and the convex portions 3b, and other portions are the same as those of the second embodiment. A different part from 2 is demonstrated in detail.

  In this embodiment, a convex portion 3c is formed on the back surface corresponding to the concave portion 3a on the surface of the heat shield layer 3, and a concave portion 3d is formed on the back surface corresponding to the convex portion 3b on the front surface. The heat shield layer 3 can be obtained by, for example, hot press molding.

  According to the concrete curing sheet 1 of the twelfth embodiment, the same effects as those of the second embodiment can be achieved.

  Moreover, in Embodiment 2-12, although both the recessed part 3a and the convex part 3b are provided in the heat insulation layer 3, you may provide only any one.

  Moreover, in Embodiment 2-12, the shape, number, and arrangement | positioning of the recessed part 3a and the convex part 3b can be set arbitrarily.

  In addition, the features of Embodiments 2 to 12 can be arbitrarily combined.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention can be used for curing concrete.

DESCRIPTION OF SYMBOLS 1 Concrete curing sheet 2 Water retention layer 3 Heat insulation layer 3a Concave part 3b Convex part 4 Thermal insulation layer

Claims (4)

A water retention layer,
A concrete curing sheet comprising a heat shielding layer that reflects heat, wherein the water retaining layer and the heat shielding layer are integrated. In the concrete curing sheet according to claim 1,
A concrete curing sheet, wherein a concave portion is formed in the heat shielding layer. In the concrete curing sheet according to claim 1,
A concrete curing sheet, wherein the heat shielding layer has a convex portion. In the concrete curing sheet according to any one of claims 1 to 3,
A heat insulating layer is provided between the water retaining layer and the heat shielding layer,
A concrete curing sheet, wherein the water retaining layer, the heat insulating layer and the heat shielding layer are laminated and integrated.

Images