JP5683504B2 - Adhesive tape for curing concrete and curing method - Google Patents

Description

  The present invention relates to an adhesive tape used for curing concrete. More specifically, the present invention does not deteriorate during curing of concrete and has a tear strength suitable for removal treatment after curing of concrete. The present invention relates to a concrete curing adhesive tape that is easy to handle.

  Concrete can be said to be an indispensable social infrastructure material in modern times, and a lot of concrete is used regardless of whether it is noticeable every day such as roads, stations and buildings. It is used as a footing foundation and is the basis for housing. It is often used for structural materials in combination with reinforcing bars, and its use requires that the strength of the concrete be maintained permanently. For that purpose, when making concrete articles, etc. It is important to provide a sufficiently high quality.

  In order to improve the quality of concrete, and in particular to give the required strength and durability as a structural material, it is necessary to perform sufficient curing at the time of concrete construction. The curing of concrete is performed so that the concrete is sufficiently hardened and given strength is obtained, and the temperature suitable for hydration of the cement contained in the concrete is maintained and the hydration reaction of the cement is performed. It is desirable to keep it moist so that the necessary moisture does not run out. In general, a curing period of at least one month, preferably at least three months, is required at least, and the quality improves as the period increases under favorable conditions.

  If the concrete is not cured and simply left, the surface is dried by direct sunlight, wind, etc., and sufficient hydration reaction of the cement is not performed, and cracks are promoted by high temperatures such as summer when the summer sun continues, There may be a problem that the cement hydration reaction becomes slow due to a low temperature such as winter, where freezing may occur, and sufficient strength is not developed. For example, according to Cement Association Concrete Pamphlet No. 50 (1956), when concrete is left in the air without being cured, the compressive strength of the concrete is only half or less than when it is constantly wet-cured. It has been reported. In addition, it has been confirmed that the compressive strength is improved even after 6 months when wet. Thus, curing is a very important process in concrete construction work.

  Conventionally, in curing for concrete construction, for example, do not remove the formwork used at the time of placing concrete as it is for a long time, or cover it with a vinyl sheet for construction or spray water regularly to prevent drying as much as possible This method was adopted.

  However, when casting concrete using a formwork, there is a tendency to remove the formwork as early as possible due to restrictions on work processes and delivery dates. If the formwork is removed at an early stage, the concrete is directly exposed to the outside air, and the quality deteriorates due to temperature change, drying, etc. as described above. In addition, after removing the formwork, covering with a vinyl sheet for construction as a curing process or periodically spraying water is cumbersome due to an increase in work process, increasing labor and labor, and inefficient. In general, since the concrete is apparently solidified, the work is lightened due to lack of recognition and knowledge, drying cannot be completely prevented or watering is unevenly distributed, and the hydration reaction is not uniformly performed, resulting in sufficient There was a problem of reducing the quality of concrete without curing.

  In this way, in concrete curing work to increase the quality of strength, durability, etc., it is not necessary to hold the formwork for a long time, and it is possible to save labor as much as possible, preferably even for short delivery times. There was a need for a curing method that would help shorten the construction period so that it could be handled. Various proposals have been made according to such circumstances.

  According to Patent Literature 1, a concrete curing method using a sheet is proposed. As shown in FIG. 3, this method includes a curing sheet 14 composed of a heat insulating member 15 and a pair of water-impermeable adhesive films 17 and 18 arranged on both sides so as to sandwich the heat insulating member 15 on the inner surface of the mold 10. This is a method of sticking and placing the concrete body 16 and leaving the curing sheet 14 in a bonded state without peeling off the surface of the concrete body 16 even after the mold body 10 is removed after the concrete body 16 is cured. . According to such a curing method, the curing sheet 14 remains firmly on the surface of the concrete body 16 even after the mold 10 is removed, and the curing sheet 14 has both heat insulation and water impermeability. The concrete body 16 can be prevented from drying due to temperature changes such as solar radiation under the heat and low temperatures in the cold season, and can maintain a wet state. As a result, good quality can be imparted to the concrete.

  However, in this method, as disclosed, it is necessary to select a material whose adhesion between the mold and the adhesive film is weaker than the adhesion between the adhesive film and the concrete. If the adhesive strength with the film is weakened, the curing sheet is displaced when the concrete is placed, and the concrete surface cannot be effectively protected and cured. On the other hand, when the adhesive strength between the mold and the adhesive film is increased, the adhesive film is peeled off when the mold is removed, causing a problem that the concrete cannot be covered.

  According to Patent Document 2, a concrete curing method using a sheet is also proposed. In this method, as shown in FIG. 4, a concrete body 16 is cast using a mold, and after the concrete body 16 is hardened, the mold is removed, and then an adhesive 27 and an impermeable synthetic resin are used. In this method, a curing sheet 24 made of a film 25 is attached to the surface of the concrete body 16. According to such a curing method, since the curing sheet 24 that does not allow moisture to pass through protects the surface of the concrete body 16 after removing the formwork, the concrete body 16 can maintain a wet state, and as a result, good quality can be obtained. It can be applied to concrete.

  However, as disclosed in this method, since the synthetic resin film is selected from a photodegradable film or an alkali-degradable film, the curing period cannot actually be managed depending on the degree of sunlight. Also, there is a problem that the concrete part is displaced at the time of deterioration of the film, and the curing is not sufficient depending on the place, or the film remains and causes a decrease in aesthetic appearance.

JP-A-9-158472 Japanese Patent Laid-Open No. 10-61184

  In other words, in the concrete curing work, long-term holding of the mold to increase the quality such as strength and durability is not preferable because of work site conditions and delivery time restrictions. Therefore, it was considered desirable to adopt a method of covering the concrete surface by some method as a curing process after removing the formwork as in the above proposal. The problem was how to apply a cover that covers the surface of the concrete so that it can be easily handled and can fulfill the role of maintaining the wet state in improving the quality of the concrete for a desired period of time.

  The present invention has been made in view of the above-described conventional problems. The object of the present invention is to easily and reliably cover the surface of concrete when curing concrete, and It is intended to provide a concrete curing adhesive tape that does not deteriorate during the period required for curing, and can be easily removed, thereby reducing work time and workload during concrete laying. As long as the concrete surface is covered, even if it is not a skilled person, the quality of the concrete can be improved reliably, and no special curing work is required. is there.

  As a result of organizing and variously examining the problems of the conventional concrete surface covering sheet, the present inventors are a plastic film such as polypropylene that is not easily deteriorated by light or pH fluctuation, and has no water permeability. It is easy to handle and stick to the film, and has a high tear strength that is difficult to tear or separate even if a tear occurs during removal, while reducing costs. It discovered that said objective could be achieved by the adhesive tape for concrete curing which has and the curing method using the adhesive tape.

  That is, according to the present invention, the pressure-sensitive adhesive tape is used for curing concrete and covers the surface of the concrete, and includes at least a base material layer and a pressure-sensitive adhesive layer provided on one surface of the base material layer. Thus, there is provided a pressure-sensitive adhesive tape for concrete curing, wherein the maximum load F obtained by the product of the tear strength TR and the thickness t of the base material layer is approximately 5 to 40 N. The tear strength TR is preferably defined as the smaller one of the tear strength in the MD direction or the tear strength in the CD direction.

  Further, according to the present invention, the concrete is placed on the mold, and after the cast concrete is hardened, the mold is removed, and the concrete is left for a predetermined period with the adhesive tape covered on the surface of the hardened concrete. A curing method comprising, as an adhesive tape, at least a base material layer and an adhesive layer provided on one surface of the base material layer. The base material layer has a tear strength TR and a thickness t. There is provided a concrete curing method characterized by using a concrete curing adhesive tape having a maximum load F determined by a product of approximately 5 to 40 N. The tear strength TR is preferably defined as the smaller one of the tear strength in the MD direction or the tear strength in the CD direction.

  According to the adhesive tape for curing the concrete of the present invention, it can be easily applied to the surface of the concrete, the curing is completed, and the handling and work is easy even when the adhesive tape for curing the concrete is peeled off from the surface of the concrete. In addition, the adhesive tape itself does not deteriorate during curing and does not cause evaporation and diffusion of moisture. Therefore, even if it is not an expert, it has the outstanding effect that the high quality concrete to which sufficient intensity | strength and durability were provided can be obtained simply. Public buildings such as roads, stations, buildings, etc., or private houses, made of such highly reliable concrete, provide people with security and safety for a long time and minimize secondary disasters during an earthquake. Can be suppressed.

It is sectional drawing which shows one Example of the adhesive tape for concrete curing of this invention. It is sectional drawing explaining an example of the curing method using the adhesive tape for concrete curing of this invention. It is sectional drawing which shows an example of the conventional curing sheet. It is sectional drawing which shows another example of the conventional curing sheet. It is a top view which shows the shape of the test piece used for a tear test.

  Hereinafter, embodiments of the adhesive tape for concrete curing according to the present invention will be described in detail, but the present invention is not limited to these and is not interpreted as long as it does not depart from the scope of the present invention. Various changes, modifications and improvements can be made based on the knowledge of those skilled in the art. The present invention is an adhesive tape for concrete curing which is used for improving the quality of concrete, which is applied to cover the surface of concrete and protect the concrete for a predetermined period to keep the concrete wet. It is. It may be in the form of a sheet or a roll, and the form is not limited.

  In the present invention, concrete refers to a mixed material in which different kinds of materials are combined, and each material contained in the concrete is not limited as long as it is a mixed material that requires curing for a predetermined period of time. The adhesive tape for concrete curing consists of various well-known various types, for example, made of cement such as Portland cement or mixed cement made of silica, etc., aggregate such as sand and gravel, admixture such as water reducing agent, and water. It can be suitably used when curing concrete.

  The adhesive tape for curing concrete according to the present invention is formed of at least a base material layer and an adhesive layer. Before use, it is preferable that a release liner is provided on the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape. In addition, it is also preferable to perform primer treatment or back surface treatment treatment as necessary.

  In the present invention, as a means for peeling off the adhesive tape attached to the concrete surface after curing is complete, the adhesive tape itself has photodegradability and alkali deterioration properties, and the sheet is naturally formed by the alkaline component that exudes from sunlight or concrete. It is characterized by the fact that it is removed by hand or machine rather than being peeled off, and the tear strength of the adhesive tape is increased so that it can be easily removed. In general, adhesive tape often tears in the middle when it is peeled off, and it is often necessary to turn the adhesive part over and over again. Since a tear is likely to occur in contact with the tape, if the tear strength of the pressure-sensitive adhesive tape is low, it will be torn or separated from the tear. By increasing the tear strength of the adhesive tape, even if a tear occurs at the work site, it will not be torn or separated from it. It can be peeled off, greatly improving workability and reducing the work period.

  In addition, since the adhesive tape for curing the concrete of the present invention uses a material that hardly deteriorates outdoors, the concrete surface is maintained in a good wet state for a desired period until the cover of the concrete surface with the adhesive tape is removed. Protects the body, so it can be cured. The pressure-sensitive adhesive tape for curing concrete of the present invention is almost prevented from evaporating moisture on the entire surface of the concrete surface, so that a good wet state is maintained in the entire area of the concrete surface. It is possible to obtain.

  In the present invention, the tear strength of the adhesive tape is defined as follows. That is, the maximum load F (N) obtained by the product of the tear strength TR (N / m) and the thickness t (m) of the base material layer is preferably in the range of about 5 to 40 N (units). May be omitted). This is expressed by the following equation 5 <TR × t = F <40, and indicates that the maximum load F per thickness t is the tear strength TR.

  If the maximum load F of the base material layer is smaller than 5N, it is easy to tear when peeled off, and the workability such as taking time and effort to remove the adhesive tape is lowered, so that it is not suitable for short delivery work. On the other hand, in order to prevent the adhesive tape from tearing, it is better that the maximum load F for tearing the adhesive tape is larger. However, the resin used as a normal base material layer has a limit in the tear strength TR. Although t is increased, that is, the base layer is thickened and the maximum load F is increased, a thick adhesive tape is difficult to handle and high in cost, and is impractical and not preferable.

  In the resin or the like used for the base material layer, the tear strength TR is approximately 400 kN / m or less. Moreover, it is practical that the thickness t of the base material layer is 100 μm or less. Therefore, the maximum load F of the base material layer is preferably 40 N or less.

  The tear strength TR is a value obtained by a tear test shown in Japanese Industrial Standard K7311, and the thickness t is a notch portion of a right-angled tear test piece (FIG. 5) used for the tear test. Thickness.

  In the case where a resin or the like used for the base material layer is processed into a film shape or a sheet shape, the strength may differ depending on the pulling direction. In the present invention, it is preferable that the maximum load F of the base material layer is 5 N or more even when pulled from any direction, based on the actual work of applying and peeling the curing adhesive tape on the concrete. That is, even if the tear strength TR is the smaller one of the tear strength in the MD direction or the tear strength in the CD direction of the base material layer, the tear strength TR and the thickness t of the base material layer It is preferable that the maximum load F calculated | required by the product of is in the range of 5-40N in general.

  In the present invention, it is preferable to provide a release liner that protects the pressure-sensitive adhesive layer before use in terms of storage, transportation, and handleability during work, but the surface of the release liner on the pressure-sensitive adhesive layer side is a silicon-based release agent. It is more preferable to treat with a release agent such as a long-chain alkyl release agent or a fluorine release agent, since the peelability between the pressure-sensitive adhesive layer and the release liner is improved.

  In order to improve the adhesion and adhesion durability between the base material layer and the pressure-sensitive adhesive layer, an epoxy resin, a vinyl copolymer having a carboxyl group, an acrylic copolymer, etc. are used between the base material layer and the pressure-sensitive adhesive layer. It is also preferable to provide it as a primer layer. Moreover, it is also preferable to perform a back treatment on the side of the base material layer opposite to the pressure-sensitive adhesive layer using a release treatment agent such as fluorine, long chain alkyl, or silicon.

  Hereinafter, the concrete curing pressure-sensitive adhesive tape of the present invention will be described in more detail based on the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the adhesive tape for concrete curing according to the present invention. As shown in FIG. 1, a concrete curing adhesive tape 5 includes a base material layer 1 and an adhesive layer 2 provided on one surface of the base material layer 1, and the base material layer 1, the adhesive layer 2, A primer layer 3 is provided therebetween, and a back surface treatment agent layer 4 is provided on the side of the base material layer 1 opposite to the pressure-sensitive adhesive layer 2. Usually, in a state before use, a release liner is often provided on the surface of the pressure-sensitive adhesive layer 2 opposite to the base material layer 1 (not shown).

  By providing the primer layer 3, when the concrete curing is completed, when the concrete curing adhesive tape 5 is pulled to remove, only the base material layer 1 is peeled off and the adhesive layer 2 remains on the concrete surface. Can be prevented. If the pressure-sensitive adhesive layer 2 remains on the concrete surface, the workability cannot be improved even if the tear strength of the base material layer 1 is large. It is important that the base material layer 1 and the pressure-sensitive adhesive layer 2 are firmly integrated by the primer layer 3.

  The surface of the release liner on the pressure-sensitive adhesive layer 2 side is subjected to a release agent treatment such as a treatment with a silicon-based release agent to improve the peelability between the pressure-sensitive adhesive layer and the release liner. In addition, when the release liner is made of a material having good releasability, it is not necessary to perform the release agent treatment.

  Now, an example of the manufacturing method of the adhesive tape 5 for concrete curing shown in FIG. 1 is shown below. First, a film made of an olefin resin such as polypropylene or polyethylene, or a polyester resin and having a desired tear strength with a predetermined thickness is prepared. Preferably, a primer made of acrylic resin, vinyl copolymer, rubber resin, polyester resin or the like is applied to one side of the film and dried, and then acrylic, rubber, silicon is applied on the primer. An adhesive made of a system or fluorine resin is applied. The surface of the film opposite to the surface where the adhesive is applied is preferably coated with a back treatment agent comprising a long-chain alkyl release agent, a silicon release agent, or a fluorine release agent, and the concrete curing of the present invention is performed. A pressure-sensitive adhesive tape 5 is obtained.

  Next, the concrete curing method when the adhesive tape for curing concrete according to the present invention is used will be described. FIG. 2 is a cross-sectional view for explaining an example of the curing method, and shows an example in which the concrete curing adhesive tape 5 of the present invention is applied to a concrete body 6 having a vertical wall surface.

  A formwork (not shown) is installed, and concrete is placed in the formwork to form a concrete body 6. When the concrete body 6 is solidified and the strength reaches a predetermined value, the formwork is removed, and a concrete curing adhesive tape 5 is attached so as to cover the entire opened surface. FIG. 2 shows a state after the concrete curing adhesive tape 5 is stuck to the concrete body 6. It is preferable that the adhesive tape 5 for curing concrete is stuck on as large an area as possible without cutting.

  The base material layer of the adhesive tape 5 for curing the concrete prevents moisture from evaporating from the surface of the concrete body 6 and keeps the concrete body 6 in a good wet state suitable for curing. Then, after curing the concrete body 6 for a predetermined period while leaving the concrete curing adhesive tape 5 on the surface, the curing is completed if the concrete curing adhesive tape 5 is peeled off from the concrete body 6. The concrete body 6 kept in a good wet state can be given a desired strength, and the adhesive tape 5 for curing the concrete can be easily removed because it is difficult to tear during pulling.

  Hereinafter, the constituent material of the adhesive tape for concrete curing according to the present invention will be described. As described above, the adhesive tape for curing concrete is composed of at least a base material layer and an adhesive layer. The pressure-sensitive adhesive layer adheres the concrete and the base material layer, has good adhesion to the base material layer and the concrete, and loses the adhesive property due to the alkali component that diffuses from the curing concrete. Unless otherwise specified, the type is not particularly limited. Usually, a solvent-type acrylic pressure-sensitive adhesive, a solvent-type natural rubber-based pressure-sensitive adhesive, a solvent-type block copolymer-based pressure-sensitive adhesive, an emulsion-type acrylic pressure-sensitive adhesive, a hot-melt-type acrylic pressure-sensitive adhesive, or the like can be used. From the viewpoint of durability, it is preferable to use an acrylic pressure-sensitive adhesive. Although the thickness of an adhesive layer is not limited, Generally it is about 10-100 micrometers.

  The base material layer is used for preventing moisture from evaporating from the concrete. Therefore, the type of the base material layer is not particularly limited as long as the evaporated water is not permeated. Usually, olefin resins such as polypropylene and polyethylene, plastic films such as polyethylene terephthalate, polyvinyl chloride, and the like can be used.

  The thickness of the base material layer is not limited, but is generally about 20 to 150 [mu] m, and more preferably about 25 to 100 [mu] m because strength is obtained and cost is not incurred. The color of the base material layer is not limited to white, black, milky white, transparent, etc., but in the dark color, sunlight is biased and concentrated, and the concrete surface temperature under the tape varies and curing is performed uniformly. White or milky white is preferable because there is a possibility that it may not be removed and it may be forgotten to be removed if it is transparent.

  The release liner provided on the adhesive layer of the adhesive tape for concrete curing and removed when the tape is used may be a release liner or release paper generally used for an adhesive tape. The release liner needs to be able to be easily manufactured into a roll shape, a sheet shape or the like without deteriorating the pressure-sensitive adhesive properties of the pressure-sensitive adhesive, and is composed of a base material that is easily peeled off from the pressure-sensitive adhesive. As the type of the substrate, the type is not particularly limited as long as it can be easily produced into a roll shape, a sheet shape, etc. without deteriorating the adhesive property of the pressure sensitive adhesive. Paper such as crecote paper and Japanese paper, and woven fabric made of fibers such as rayon, polyester, nylon, and acrylic are used. Depending on the type of pressure-sensitive adhesive, a release agent is not required when the release liner and the pressure-sensitive adhesive have a release effect (for example, olefin resins such as polypropylene and polyethylene), but in other cases, the pressure-sensitive adhesive layer and It is preferable to perform a release agent treatment on the contact surface.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to these Examples.

  Example 1 A polyolefin film (FLJ-4002 manufactured by 3M) having a thickness of 80 μm was prepared as a base material layer. When the tear strength of this film was measured according to Japanese Industrial Standard K7311, it was 164 kN / m in the MD direction and 113 kN / m in the CD direction.

  An acrylic primer (0.3 μm) was applied to the base material layer, and then 2 parts by weight of an acrylic pressure-sensitive adhesive (Denac EX-421 made by Nagase Kasei Co., Ltd. with respect to 100 parts by weight TM-287 made by Toa Gosei) Were dried so that the thickness after drying was 30 μm. And the long-chain alkyl type | system | group back processing agent was apply | coated 0.2 micrometer to the surface on the opposite side to the primer and adhesive of a base material layer, and the adhesive tape for concrete curing was obtained.

  Using the obtained adhesive tape for curing the concrete, the concrete body was cured by sticking to the concrete body which had been solidified and removed from the formwork. After curing for 3 months, the adhesive tape for concrete curing was peeled off from the concrete body, and it was easy to peel off and could be easily removed without tearing the tape. Table 1 shows the specifications and tear test results of the base material layer of the adhesive tape for concrete curing used, and the ease of peeling of the adhesive tape for concrete curing after curing.

  (Examples 2-5, Comparative Examples 1-3) Except that the material used for the base material layer of the adhesive tape for concrete curing was changed, the concrete body was cured under the same conditions as in Example 1, and the concrete curing after curing. The ease of peeling of the adhesive tape for use was evaluated. Table 1 shows the specifications and tear test results of the base material layer of the adhesive tape for concrete curing used, and the ease of peeling of the adhesive tape for concrete curing after curing.

In Table 1, the material of the base layer is PE for polyethylene, PP for polypropylene, PET for polyethylene terephthalate, PP / PE for mixed resin of PP and PE in a weight ratio of 60:40, EVA for ethylene- A vinyl acetate copolymer is shown. Moreover, as for the ease of peeling, (circle) is favorable, and x shows that the tape was torn frequently in the middle of peeling and it was difficult to remove all the tapes. In addition, the material which comprises the concrete body used in each Example and each comparative example is Portland cement as a cement, gravel and sand as an aggregate, AE water reducing agent and water as an admixture. The mixing ratio of cement, gravel, sand, admixture, and water is 25: 32: 32: 0.2: 11, respectively. In each example and each comparative example, the compressive strength of the concrete body after curing was 40 N / mm ² or more, and good quality was imparted as the concrete body.

  (Tear test) The tear test was performed in accordance with the tear test method defined in Japanese Industrial Standard K7311 (1995). The tear test method will be described below. The base material layer as a test piece is a right-angled tear test piece shown in FIG. When measuring the tear strength in the MD direction (flow direction of the original film), when measuring the tear strength in the CD direction (width direction of the original film) with the long direction of the test piece as the MD direction The CD direction is the long direction of the test piece. The thickness t (m) of the notch of the test piece is measured, the test piece is attached to a tensile tester, pulled at a tensile speed of 300 ± 15 mm / min until the test piece is broken, and the test until it is broken Read and record the machine's maximum load F (N). The test is performed on three test pieces, and the average value is taken as the test result. The tear strength TR (N / m) is obtained by the following equation, TR = F / t.

  (Discussion) As can be seen from Table 1, in Examples 1 to 5 using the adhesive tape for concrete curing of the present invention, the ease of peeling of the tape after curing was good, but Comparative Examples 1 to 3 When the tape was removed after curing, the tape was easily torn and the ease of peeling was not good.

  The adhesive tape for curing concrete according to the present invention and the curing method are used for curing roads, stations, buildings, etc., and concrete that is a footing foundation (a foundation of a house).

1: base material layer, 2: adhesive layer, 3: primer layer, 4: back treatment agent layer, 5: adhesive tape for concrete curing, 6, 16: concrete body, 10: formwork, 12: support work, 14 24: Curing sheet, 15: Thermal insulation member, 17, 18: Adhesive film, 25: Synthetic resin film, 27: Adhesive.

Claims (4)

Adhesive tape used for curing concrete, covering the surface of concrete,
At least comprising a base layer that is not water permeable and an adhesive layer provided on one surface of the base layer,
The adhesive layer is in contact with the surface of the concrete, and adheres the concrete and the base material layer,
The adhesive tape for curing concrete , wherein the maximum load F obtained by the product of the tear strength TR and the thickness t of the base material layer is 5 to 40N.   The adhesive tape for concrete curing according to claim 1, wherein the tear strength TR is the smaller one of the tear strength in the MD direction or the tear strength in the CD direction of the base material layer. Concrete is placed on a mold, and after the cast concrete has hardened, the mold is removed, and the concrete is cured for a predetermined period in a state where an adhesive tape is covered on the surface of the hardened concrete.
The pressure-sensitive adhesive tape comprises at least a non- water-permeable base material layer and a pressure-sensitive adhesive layer provided on one surface of the base material layer, and the pressure-sensitive adhesive layer is in contact with the concrete surface, and Concrete curing adhesive tape for bonding concrete and the base material layer, wherein the maximum load F determined by the product of the tear strength TR and the thickness t of the base material layer is 5 to 40 N Concrete curing method characterized by using   The method for curing concrete according to claim 3, wherein the tear strength TR is the smaller one of the tear strength in the MD direction or the tear strength in the CD direction of the base material layer.

Images