Adhesive tape for asphalt paving and method for producing the same

Abstract

This invention provides an adhesive tape for asphalt paving and a method for producing it, which prevents the adhesive layer from adhering to workers' hands, shoe soles, or vehicle tires during and after application to the road surface, thereby improving work efficiency and maintaining performance, providing weed control, and shortening the construction period. [Solution] The adhesive tape 1 for asphalt paving is mainly composed of a sheet-like adhesive layer 11 with adhesive properties on both sides, formed from a mixture of straight asphalt and a synthetic rubber adhesive. The back surface 11a of the adhesive layer 11 is made capable of attaching a removable release liner 13, and the entire front surface 11b of the adhesive layer 11 is covered with countless hard particles 14.

Description

Technical Field

[0001] The present invention relates to an asphalt pavement adhesive tape used for repairing asphalt pavements.

Background Art

[0002] When repairing asphalt pavements, conventionally, a disc cutter was rotated and cut from the front surface of the existing surface layer of the asphalt pavement, the soil surface of the recess formed by removing the surface layer of the portion surrounded by the cut portion was rolled with a roller, and then roadbed materials such as crushed stones and sand were spread to a predetermined thickness with a rake or the like and rolled with a roller. After spraying asphalt emulsion on the front surface of the roadbed made of roadbed materials and the cut surface of the existing surface layer, a heated asphalt mixture was placed and spread with a trowel or the like, and then rolled with a roller to finish. In the asphalt pavement repaired by such a conventional method, at the boundary between the newly formed surface layer and the old existing surface layer after the heated asphalt mixture hardened, the binding force of the aggregate of the asphalt mixture was weak, so there were problems such as the aggregate, sand, etc. collapsing due to vibrations caused by the passage of vehicles and scattering around, and when rainwater seeped in from the gap at the boundary and the water content ratio increased, the ground loosened, and the distortion reached the surface layer and cracks occurred.

[0003] As one measure against such problems, the inventor has devised an asphalt paving method in which an asphalt pavement double-sided adhesive tape is adhered to the front surface (upper surface) of the boundary between the newly formed surface layer and the existing surface layer so as to cover the boundary, the release paper is peeled off after adhesion to leave the adhesive layer, and a heated asphalt mixture is placed thereon (see Patent Document 1). However, in this method, there was a problem that the adhesive force of the adhesive constituting the adhesive layer was not sufficient and it peeled off when rainwater hit.

[0004] Furthermore, in order to improve upon the problems of Patent Document 1, the present inventor has developed a double-sided adhesive tape for asphalt pavement that utilizes a superior adhesive (see Patent Document 2). This double-sided adhesive tape for asphalt pavement is used by adhering it to the pavement joint section of a pavement section that is vertical or close to vertical, and consists of an adhesive layer and a release liner adhered to at least one side of the adhesive layer, and the adhesive constituting the adhesive layer is a mixture of at least 70-90% by weight of straight asphalt and 30-10% by weight of synthetic rubber adhesive, or a mixture of 65-75% by weight of straight asphalt, 4-8% by weight of synthetic rubber, 15-20% by weight of tackifier and 4-8% by weight of plasticizer.

[0005] This double-sided adhesive tape for asphalt pavement is sold under the product name "Astape" (registered trademark), and is registered with the Ministry of Land, Infrastructure, Transport and Tourism's NETIS (New Technology Information System) (August 29, 2013, NETIS registration number KK-130019-A). It has also been registered for VE evaluation (technology with evaluated utilization effectiveness) (December 5, 2019, NETIS registration number KK-130019-VE). By using Astape for asphalt pavement repair work, it is possible to tightly bond the joint between the existing and new surface layers at the pavement joint section without using fire, resulting in improved safety and shorter construction periods. As a result, its evaluation in this technical field has increased, and it is now widely used in actual asphalt pavement repair sites and is recognized as a useful product.

[0006] Subsequent verification of the usage of double-sided adhesive tapes for asphalt pavement and research into improvements have revealed that further improving the adhesion performance to pavement joint sections leads to a significant improvement in pavement workability and prevents cracking, rainwater intrusion, and scattering of soil and aggregate at the joints (pavement boundaries) between the new and existing surface layers. Therefore, with the aim of improving the performance of double-sided adhesive tapes for pavement, a double-sided adhesive tape for asphalt pavement has been developed, consisting of an adhesive layer and a release liner detachably adhered to at least one side of the adhesive layer. The adhesive layer is a mixture of at least 65-90% by weight of straight asphalt and 35-10% by weight of synthetic rubber adhesive, and at least a portion of one or both sides of the adhesive layer is provided with an adhesion-enhancing section made of the same or a different synthetic rubber adhesive as the synthetic rubber adhesive constituting the adhesive layer (see Patent Document 3). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2006-183428 (Japanese Patent Publication No. 4679995) [Patent Document 2] Japanese Patent Publication No. 2013-241798 (Japanese Patent Publication No. 5856904) [Patent Document 3] Japanese Patent Publication No. 2023-146087 (Japanese Patent Publication No. 7337411) [Overview of the project] [Problems that the invention aims to solve]

[0008] By the way, when applying double-sided adhesive tapes for asphalt paving, such as those shown in Patent Documents 2 and 3, on-site, they are sometimes used as a finishing touch for asphalt paving or simple paving, or to seal the boundaries between paved surface layers. That is, when applying these double-sided adhesive tapes for asphalt paving to the surface of the boundary between an existing surface layer and a new surface layer, the surface of the boundary between adjacent new surface layers, or the surface of the boundary between adjacent existing surface layers, the release liner is first applied to the surface of the boundary (hereinafter, these surface of the boundary will be referred to as the "road surface") with the side that does not have the release liner attached (in the case of the double-sided adhesive tape for asphalt paving described in Patent Document 3, one side of the adhesive layer with the reinforced adhesive portion) in close contact with the surface of the boundary (hereinafter, these surface of the boundary will be referred to as the "road surface"), and then the release liner is peeled off. However, it has been found that if the side with the exposed adhesive layer adheres to the worker's hand at that time, it may lead to a decrease in work efficiency. Furthermore, it was found that even after the double-sided adhesive tape for asphalt paving is applied to the road surface, the adhesive properties of the exposed side of the adhesive layer remain. This means that if it adheres to the soles of workers' shoes or the tires of passing vehicles, a portion of the adhesive layer may peel off and stick to the soles or tires, or the adhesive layer in the peeled-off area may become thinner, potentially reducing the effectiveness of the double-sided adhesive tape for asphalt paving. Additionally, it was considered possible that due to aging after application, fine cracks may form in the double-sided adhesive tape for asphalt paving after it has hardened, leading to cracking and potentially allowing weeds to grow from the cracks.

[0009] In view of these problems, the present invention aims to provide an adhesive tape for asphalt paving and a method for producing it, which, as a result of repeated improvements, prevents the adhesive layer from adhering to the hands, soles of shoes, or tires of vehicles during and after application to the road surface, thereby improving work efficiency and maintaining performance, providing weed control, and shortening the construction period. [Means for solving the problem]

[0010] The adhesive tape for asphalt pavement of the present invention mainly consists of a sheet-like adhesive layer formed from a mixture of straight asphalt and a synthetic rubber-based adhesive, with adhesive properties on both sides. A removable release liner can be attached to the back side of this adhesive layer, and hard particles are attached only to the entire front surface of the adhesive layer.

[0011] The adhesive tape for asphalt pavement of the present invention is intended for use in simple asphalt pavement (hereinafter referred to as "simple pavement") or asphalt pavement. Simple pavement consists of a surface layer and a base course, where aggregates (crushed stone, sand, stone powder, etc.) are bound together with bituminous material (straight asphalt, etc.). Asphalt pavement consists of a surface layer, a base course, and a base course, where aggregates (crushed stone, sand, stone powder, etc.) are bound together with bituminous material (straight asphalt, etc.). The surface layer is made of a hot asphalt mixture, and the base course is located on the base course and is usually made of a hot asphalt mixture. Furthermore, the adhesive tape for asphalt pavement of the present invention can also be applied to dustproofing and surface treatments, such as leveling the surface of gravel roads and applying and impregnating bituminous material.

[0012] As bituminous materials, paving petroleum asphalt, modified asphalt, and petroleum asphalt emulsion are used. Modified asphalt includes rubber and resin-containing asphalt, which has high-molecular-weight materials such as rubber and resin added to asphalt, and semi-blown asphalt, which has increased viscosity through a blowing process. Petroleum asphalt emulsion used as an adhesive is made by dispersing relatively soft petroleum asphalt in water containing emulsifiers and stabilizers, and cationic (K) and anionic (A) types are used. Compaction can be performed using a compactor, road roller, vibratory roller or tire roller, or by treading on it by a worker. In addition, for the release liner, one or both sides of a film made of paper or polyester, polypropylene, polyethylene, etc., coated with silicone or fluororesin having a low-energy surface can be used.

[0013] With the adhesive tape for asphalt paving according to the present invention, when the back side of the adhesive layer, after peeling off the release liner, is in close contact with the road surface, the front side, to which hard particles are attached, becomes exposed. At this time, since the entire surface of the front side is covered with hard particles, the adhesive layer does not adhere to the hands of workers, thus preventing a decrease in work efficiency and shortening the construction period. Furthermore, since the surface of the adhesive layer does not adhere to the soles of work vehicles' shoes or the tires of passing vehicles, the problem of part of the adhesive layer peeling off and reducing performance after application is less likely to occur. Moreover, because the front side is covered with hard particles, it can maintain its function as an adhesive tape for asphalt paving for a long period of time, suppressing cracks and fissures due to aging and providing weed control. Furthermore, since the hard particles are attached to the surface of the adhesive layer in a loose state, the flexibility of the tape is maintained. Therefore, with a release liner attached to one side of the adhesive layer, long lengths of asphalt paving adhesive tape can be stored and transported by winding them into a roll. In addition, after application, vehicles pass over the hard particles, protecting the surface of the adhesive layer, thus improving the abrasion resistance of the asphalt paving adhesive tape and reducing wear damage. Moreover, the finished surface of the asphalt paving adhesive tape of the present invention has a rough texture after application, resulting in a high slip resistance value and an expected effect of suppressing tire slip in rainy weather. Furthermore, if colored particles such as colored sand are applied to the hard particles, the asphalt paving adhesive tape of the present invention can be used not only for asphalt paving but also as road line tape or design tape.

[0014] Suitable hard particles for use in this invention include materials used as curing aggregates, such as ceramics, oxidized slag, natural or artificial silica sand (quartz sand), mountain sand, river sand, calcium carbonate (limestone CaCO3), lime, stone powder, recycled asphalt mixture materials (asphalt lumps), fly ash (coal ash), recycled roof tile sand, etc., and can be used as a mixture of one or more of these.

[0015] The size of the hard particles applied to this invention is preferably 0.6 to 5.0 mm. The greater the depth to which the hard particles attached to the surface of the adhesive layer in the adhesive tape for asphalt paving sink into the adhesive layer, the easier it is for the hard particles to integrate with the adhesive during the production of the adhesive tape for asphalt paving. If the thickness of the adhesive tape for asphalt paving is 0.5 to 1.0 mm, it is a suitable thickness for application, and the storage and transportability of the adhesive tape for asphalt paving is also good. If the particle size of the hard particles is 0.6 to 5 mm, approximately 1 / 3 to 2 / 3 of the surface area of ​​the hard particles will be exposed. If the particle size of the hard particles is 1.2 to 2.5 mm and approximately 1 / 2 of the surface area is exposed, the wear damage to the hard particles will be less even on roads with heavy vehicle traffic, and the surface of the adhesive tape for asphalt paving can be made stronger. When the particle size of the hard particles is 0.6 to 1.2 mm and approximately 1 / 3 to 1 / 2 of the surface area is exposed, the surface area exposed by the hard particles is smaller. Although slightly inferior to the case where the particle size is 1.2 to 2.5 mm, it still provides sufficient strength for practical use, with less wear and tear even on roads with heavy vehicle traffic. When the particle size of the hard particles is 2.5 to 5.0 mm and approximately 1 / 2 to 2 / 3 of the surface area is exposed, the surface area exposed by the hard particles is larger, and the degree of integration with the adhesive layer is reduced. However, due to the passage of general vehicles after application, the asphalt paving adhesive tape itself deforms to match the uneven shape of the road surface to which it is applied, causing the hard particles and adhesive layer to integrate. This results in less wear and tear even on roads with heavy traffic, and a strong surface for the asphalt paving adhesive tape.

[0016] To improve the adhesion of asphalt paving adhesive tape to the road surface, it is useful to provide an adhesion-enhancing section on the back of the adhesive layer, consisting of a synthetic rubber-based adhesive that is the same as or different from the synthetic rubber-based adhesive that constitutes the adhesive layer. For example, a mixture of 65-90% by weight of straight asphalt liquid and 35-10% by weight of synthetic rubber-based adhesive can be used as the adhesive layer. The synthetic rubber-based adhesive may contain auxiliary components such as tackifiers and plasticizers in addition to synthetic rubber. The synthetic rubber-based adhesive used in the adhesion-enhancing section may be the same as or different from the synthetic rubber-based adhesive contained in the adhesive layer.

[0017] By constructing the adhesive layer in this manner, when the release liner is peeled off and the adhesive reinforcement portion is pressed against the road surface to attach the adhesive layer, problems such as the asphalt paving adhesive tape peeling off during the work process of pouring the heated asphalt mixture become less likely to occur. Combined with the fact that the joints between surface layers can be sealed without using fire, work efficiency is greatly improved. The adhesive layer and adhesive reinforcement portion of the asphalt paving adhesive tape melt with the heated asphalt mixture and solidify firmly by integrating with the heated asphalt mixture, so that good repair of the asphalt pavement is possible and a stable asphalt pavement that is less prone to cracking can be maintained over the long term. Therefore, the infiltration of rainwater from the pavement boundary and the scattering of soil and aggregate can also be effectively prevented.

[0018] As the adhesive reinforcement portion, by arranging it on the back surface of the adhesive layer in the form of dots, planes, lines, strips, or a combination of several of these shapes, sufficient adhesion performance to the pavement joint section can be obtained with a smaller amount of adhesive reinforcement portion compared to the configuration in which the adhesive reinforcement portion is provided on the entire front surface of the adhesive layer. However, a configuration in which the adhesive reinforcement portion is provided on the entire back surface of the adhesive layer may also be adopted. The synthetic rubber adhesive used in the adhesive layer and the adhesive reinforcement portion is preferably a hot-melt type thermoplastic elastomer. In this case, the heated asphalt mixture poured into the pavement section melts the synthetic rubber adhesive in the adhesive layer and the adhesive reinforcement portion together with the straight asphalt component contained in the adhesive layer, making it easier to integrate with the newly laid surface layer.

[0019] One method for producing adhesive tape for asphalt pavement according to the present invention involves a process of scattering heated hard particles over the entire surface of the adhesive layer and removing excess hard particles from the surface of the adhesive layer. By scattering heated hard particles over the surface of the adhesive layer, the hard particles become embedded in the adhesive layer as they come into contact with it, melting their surface. After heat dissipation, the hard particles are fixed to the adhesive layer. Subsequently, a release liner can be detachably attached to the back of the adhesive layer as needed. Such a production method is suitable for producing adhesive tape for asphalt pavement in a factory.

[0020] Another method for producing the asphalt pavement adhesive tape of the present invention is a method that is completed through a process of heating and melting the adhesive layer in a state where the back surface is attached to the road surface, a process of spraying hard particles over the entire front surface of the adhesive layer, a process of pressing the adhesive layer from the front surface side, and a process of removing excess hard particles from the front surface of the adhesive layer. In the case of this method, if a release liner is adhered to the back surface of the adhesive layer, it should be peeled off in advance, attached to the road surface, and construction should be started. If hard particles at normal temperature are sprayed onto the front surface of the adhesive layer in a state of being heated and melted according to a conventional method, the hard particles will sink into the melted adhesive layer and be fixed to the adhesive layer after heat dissipation. Such a production method is suitable for producing asphalt pavement adhesive tapes at the construction site.

Effects of the Invention

[0021] The asphalt pavement adhesive tape of the present invention can be used for repairing asphalt pavements and sealing joints, similar to conventional double-sided adhesive tapes for asphalt pavements. It has a structure in which hard particles are attached to almost the entire front surface of the main adhesive layer, and flexibility is ensured. Therefore, if a release liner is adhesively attached to the back surface so that it can be peeled off, it can be wound into a roll for storage or transportation. During construction, the adhesive layer is not likely to adhere to the hands of the work vehicle, and the work efficiency will not be reduced. In addition, since the surface of the adhesive layer does not adhere to the soles of the boots of the work vehicle or the tires of passing vehicles, the problem of a part of the adhesive layer peeling off and the performance after application deteriorating is also unlikely to occur. Furthermore, after application, the vehicle does not directly drive on the adhesive layer but on the hard particles. Since the front surface of the adhesive layer is protected by the hard particles, the wear resistance of the asphalt pavement adhesive tape is improved, wear damage can be reduced, and furthermore, a weed prevention effect can also be obtained.

Brief Description of the Drawings

[0022] [Figure 1] An overview perspective view showing an asphalt pavement adhesive tape which is an embodiment of the present invention. [Figure 2]Plan view showing the front surface of the adhesive tape for asphalt pavement of the same embodiment facing upward. [Figure 3] Plan view showing the back surface of the adhesive tape for asphalt pavement of the same embodiment facing upward. [Figure 4] Schematic partial cross-sectional view of the adhesive tape for asphalt pavement of the same embodiment. [Figure 5] Schematic plan view showing the asphalt pavement and pavement section targeted for asphalt repair work to which the same embodiment is applied. [Figure 6] Cross-sectional schematic view of the same asphalt pavement structure taken along line A-A in FIG. 5. [Figure 7] Cross-sectional schematic view corresponding to FIG. 6 showing a simple asphalt pavement structure to which the same embodiment is applied. [Figure 8] Schematic cross-sectional view showing the state in which the adhesive tape for asphalt pavement of the same embodiment is applied to the finishing construction of asphalt pavement.

Mode for Carrying Out the Invention

[0023] Hereinafter, the adhesive tape 1 for asphalt pavement as one embodiment of the present invention and its usage will be described with reference to the drawings while referring to the asphalt pavement structure X.

[0024] The adhesive tape 1 for asphalt pavement of the present embodiment shown in FIGS. 1(a)(b), FIG. 2, and FIG. 3 is composed of an adhesive layer (shown in black in the figure) 11 formed in a soft plate shape, an adhesion strengthening portion 12 provided by being attached only to the back surface 11a of the adhesive layer 11, and innumerable hard particles 14 attached to the front surface 11b of the adhesive layer 11. When the adhesive tape 1 for asphalt pavement produced in the factory is in the state of storage and before use, as shown in FIG. 1, a release liner 13 is adhesively attached to the back surface 11a of the adhesive layer 11 so as to be peelable, and it is in a state of being wound in a roll shape with the release liner 13 on the outside. Note that it may also be in a state of being wound in a roll shape with the release liner 13 on the inside.

[0025] A specific example of each component constituting the adhesive tape 1 for asphalt pavement of this embodiment is shown below. First, the adhesive layer 11 is mainly a mixture of straight asphalt and a synthetic rubber adhesive. In this embodiment, the adhesive layer 11 contains 65% by weight of straight asphalt (manufactured by Showa Bitumen Industries Co., Ltd.), 10% by weight of polystyrene-polyisoprene rubber (manufactured by Nippon Zeon Co., Ltd., product name "QUINTAC3450"), which is a hot-melt type thermoplastic elastomer, as a synthetic rubber adhesive, and further contains 18% by weight of hydrogenated terpene resin (manufactured by Yasuhara Chemical Co., Ltd., product name "Clearon P-115") as a tackifier and 7% by weight of mineral oil (manufactured by Nippon Sun Oil Co., Ltd., product name "SUN N STOCK 46") as a plasticizer.

[0026] The mixing method for these components is as follows: Synthetic rubber-based adhesive and tackifier are added to a twin-screw kneader heated to 140-160°C and mixed for 30-120 minutes until dissolved to form a solution. Next, straight asphalt, dissolved at 130-180°C, is added to this solution while stirring, and a plasticizer is added while stirring, and the mixture is mixed for 30-120 minutes. After confirming that the solution is uniformly mixed, it is removed from the kneader into another container and cooled to form a soft, solid adhesive block.

[0027] This adhesive block is placed in the tank of the adhesive dissolving device and heated to 140-180°C to dissolve it. The dissolved adhesive is then pumped through a die coater while still hot. The high-temperature, high-pressure adhesive is extruded from the die coater head onto a long release liner 13 to coat it in a plate-like form. Simultaneously, molten adhesive is intermittently dripped from the discharge port of the adhesive application device onto the center of one side (back surface 11a) of the adhesive layer 11, which has cooled and hardened into a plate-like form on the release liner, forming evenly spaced disc-shaped (coin-shaped) adhesive reinforcement sections 12.

[0028] Here, the adhesive constituting the adhesive reinforcement section 12 uses polystyrene-polyisoprene rubber (manufactured by Zeon Corporation, product name "QUINTAC3450"), a hot-melt type thermoplastic elastomer, as the same synthetic rubber-based adhesive contained in the adhesive layer 11. By using the same synthetic rubber-based adhesive for the adhesive reinforcement section 12 as the synthetic rubber-based adhesive contained in the adhesive layer 11, the affinity between the adhesive layer 11 and the adhesive reinforcement section 12 can be increased. The specific composition of the adhesive reinforcement section 12 is a mixture of 100 parts by weight of the aforementioned polystyrene-polyisoprene rubber (QUINTAC3450) and 10 parts by weight of mineral oil (manufactured by MORESCO Corporation, product name "Moresco White P-40").

[0029] Furthermore, the raw materials for the release liner 13 are, for example, 10 to 40 g / m² per 30 to 110 g of high-quality paper or glassine paper on both sides. 2 This material is laminated with polyethylene resin, and then silicone resin is applied to both sides (as the release liner 13, we used "WHT-64B," manufactured by San-ei Chemicals Co., Ltd., with 20g of polyethylene laminated to each side of 64g of high-quality paper, for a total thickness of 100μm).

[0030] In this embodiment, ceramic particles are used for the hard particles 14. Specifically, commercially available abrasive materials for electric furnace oxidation slag blasting (for example, product name "Ecostar," manufactured by Hoshino Sangyo Co., Ltd.) can be used. These ceramic particles mainly consist of FeO, CaO, SiO2, and Al2O3, have a Mohs hardness of 8.0, and exhibit excellent wear resistance, acid resistance, and alkali resistance. These ceramic particles have particle size specifications, and for the hard particles 14 in this embodiment, those with a particle size of 1.2 mm to 2.5 mm (product name "Ecostar No. 4") are suitable. In addition, those with a particle size of 0.6 mm to 1.2 mm (product name "Ecostar No. 5") and those with a particle size of 2.5 mm to 5.0 mm (product name "Ecostar No. 3") can also be used.

[0031] With the back surface 11a of the adhesive layer 11, which has an adhesive reinforcement section 12, placed on the release liner 13, the tape is cut to a certain length and wound up while cooling (or it may be wound up while cooling and then cut to a certain length) to form a roll of asphalt paving adhesive tape 1. For example, the thickness of the adhesive layer 11 is 0.5 mm to 1.0 mm so that it can be firmly attached to the road surface, the total thickness is made slightly greater than that, the width is 5 to 10 cm and the length is 10 to 50 m, and it is wound up into a roll. From this state, the adhesive layer 11 is unfolded so that the release liner 13 is facing downwards and placed on a workbench or floor with the front surface 11b facing upwards. Meanwhile, hard particles 14 with a particle size of 1.2 mm to 2.5 mm are heated (for example, to about 180°C) and scattered over the entire surface 11b of the unfolded adhesive layer 11. At that temperature, the hard particles 14 melt the adhesive layer 11 and sink in, so that, as shown in the schematic cross-sectional view in Figure 4, the lower half of the hard particles 14 are embedded in the adhesive layer 11, and the upper half (about half of the surface area of ​​the hard particles 14) protrudes and is exposed from the surface 11b of the adhesive layer 11. After the temperature of the hard particles 11 has decreased, the excess hard particles 14 are swept away and removed from the asphalt paving adhesive tape 1 with a broom or the like, completing the asphalt paving adhesive tape 1 as a product. The asphalt paving adhesive tape 1 can be easily stored by winding it back into a roll. The thickness, width, and length of the asphalt paving adhesive tape 1 can be set as appropriate. Furthermore, when hard particles 14 with a particle size of 0.6 mm to 1.2 mm are applied, the amount of protrusion from the surface 11b of the adhesive layer 11 is slightly reduced, and about 1 / 3 of the surface area of ​​the hard particles 14 is exposed. When hard particles 14 with a particle size of 2.5 mm to 5.0 mm are applied, the amount of protrusion from the surface 11b of the adhesive layer 11 is slightly increased, and about 2 / 3 of the surface area of ​​the hard particles 14 is exposed.

[0032] Figures 5 and 6 show a schematic plan view and cross-section view, respectively, of an asphalt pavement 2 that has undergone repair work using the asphalt pavement adhesive tape 1 described above. The asphalt pavement 2 consists of a surface layer 21 made by hardening a heated asphalt mixture in which aggregates (crushed stone, sand, stone powder, etc.) are bound together with bituminous material (straight asphalt, etc.), a base layer 22 made of the heated asphalt mixture located below it, and a subgrade 23 located further below that (the subgrade and roadbed exist below the subgrade 23, but the explanation is omitted here). Of the surface layer 21, the area outside the rectangle enclosed by the double line in Figure 5 (repair section 211) is the existing surface layer 21A, and the area inside is the newly constructed surface layer 21B that has undergone repair work.

[0033] Repair work on asphalt pavement 2 is generally carried out as follows: First, a disc cutter is rotated and cut along the pavement section 211 set on the surface of the existing surface layer 21A of asphalt pavement 2. The existing surface layer in the area surrounded by the cut is removed to create a recess on the base layer 22, and the surface of the base layer 22 in this recess is leveled with a roller or the like. In some cases, a portion of the old base layer or roadbed is removed along with the existing surface layer, and roadbed material such as crushed stone or sand is laid to a predetermined thickness with a rake or the like and compacted with a roller. Asphalt emulsion is sprayed onto the surface and sides (cut surfaces) of the roadbed 23 made of roadbed material with an air spray or engine spray, and heated asphalt mixture is poured and leveled with a rake or the like and compacted with a roller to create the base layer 22.

[0034] Next, in the recess above the base layer 22, a double-sided tape 4 for asphalt paving is applied to the nearly vertical pavement joint section 21As where the cut surface of the existing surface layer 21A is exposed. This tape consists of only the adhesive layer 11 of the asphalt paving adhesive tape 1 of this embodiment (product name "Astape", manufactured by Ishikawa Construction Co., Ltd.), or a tape consisting of the adhesive layer 11 and the adhesive strengthening part 12 (product name "Astape Dot", manufactured by Ishikawa Construction Co., Ltd.). The double-sided adhesive tape 4 for asphalt paving can be cut to an appropriate length. Alternatively, another filler material can be used to fill the cut section instead of applying the double-sided adhesive tape 4 for asphalt paving. Also, a specified amount (0.4 L / m) is applied to the surface of the base layer 22.2 Spray asphalt emulsion 24 (for example, manufactured by Maeda Road Co., Ltd., product name "Maedazol (PK-4)").

[0035] On the recessed area of ​​the prepared base layer 22, a hot asphalt mixture (a commercially available hot asphalt mixture, for example, recycled dense-graded asphalt manufactured by Hikari Ascon Co., Ltd.) is spread to a specified thickness and compacted with a plate compactor, roller, etc., to create a new surface layer 21B. Since the thickness of the double-sided adhesive tape 4 for asphalt pavement is sufficiently thin compared to the hot asphalt mixture, the adhesive layer 11 and the adhesive reinforcement part 12 that come into contact with the high-temperature hot asphalt mixture immediately melt completely and impregnate the unevenness of the cross-section at the boundary between the adjacent existing surface layer 21A and the new surface layer 21B, increasing the adhesive area and integrating with the pavement joint section 21As and the new surface layer 21B, thereby creating the asphalt pavement structure X of this embodiment.

[0036] In particular, when using the double-sided adhesive tape 4 for asphalt pavement that has an adhesive reinforcement section 12, the adhesive strength (adhesion) to the pavement joint section 21As is much greater than that of conventional tapes because it has an adhesive reinforcement section 12 in addition to the adhesive layer 11. This strengthens the ability to prevent rainwater from seeping in from the surface of the boundary between the existing surface layer 21A and the new surface layer 21, and to prevent the scattering of soil and aggregate from that boundary. As a result, an asphalt pavement structure X with excellent durability after repair and low running costs can be obtained. Furthermore, by performing pavement work using the double-sided adhesive tape 4 for asphalt pavement, which has higher adhesion to the pavement joint section 21As than the double-sided adhesive tape 4 for asphalt pavement with only an adhesive layer 11, peeling of the asphalt pavement adhesive tape 1 during work becomes less likely, improving work efficiency and shortening the construction period.

[0037] In addition, a simplified pavement 2' as shown in Figure 7 can be used instead of the asphalt pavement 2 shown in Figures 5 and 6. The simplified pavement 2' lacks the base layer 22 found in asphalt pavement 2 and consists of a surface layer 21 and a subgrade 23. The asphalt pavement structure and repair methods for the surface layer 21, subgrade 23, and the newly constructed surface layer 21B are as described above for asphalt pavement 2.

[0038] As shown in Figure 8, the adhesive tape 1 for asphalt pavement of this embodiment can be applied as a finishing material for asphalt pavement or simple pavement, or for sealing the boundaries between existing surface layers. Specifically, the adhesive tape 1 is applied to the road surface where the boundary between the existing surface layer 21A and the new surface layer 21B is located, where the boundary between adjacent new surface layers 21B and new surface layers 21B is located, and where the boundary between adjacent existing surface layers 21A and the existing surface layer is located, so that the back surface 11a of the adhesive layer 11 of the adhesive tape for asphalt pavement, from which the release liner 13 on the back surface 11b side has been peeled off, is in close contact with the adhesive reinforcement portion 12. In this way, the edges of the pavement after the completion of repair work and the joints between pavements can be sealed with adhesive strength greater than that of straight asphalt without using fire, and curing work can be omitted, enabling efficient construction, more reliably preventing the scattering of aggregate and soil from the joints and the infiltration of rainwater, and resulting in a more durable asphalt pavement.

[0039] In this state, when the asphalt paving adhesive tape 1 is applied to the road surface, the hard particles 14 attached to the entire surface 11b of the adhesive layer 11 are exposed. When the adhesive layer 11 hardens, the hard particles 14 embedded in the adhesive layer 11 are firmly fixed, and the adhesive layer 11 and the hard particles 14 become integrated. In this state, the entire surface 11b of the asphalt paving adhesive tape 1 is covered with countless wear-resistant hard particles 14, protecting the asphalt paving adhesive tape 1 from sunlight (ultraviolet rays), wind and rain, and the wheels of vehicles traveling on the road. This improves the durability of the asphalt paving adhesive tape 1 on the road surface, extends the time until reapplication, and leads to cost reduction. Furthermore, the surface after application has a rough, uneven surface due to the numerous hard particles 14 protruding from the adhesive layer 11, resulting in extremely high slip resistance, which helps to suppress tire slippage of vehicles traveling in rainy weather. In addition, it is possible to suppress cracks in the adhesive layer 11 covered by the hard particles 14, and cracks caused by those cracks, and the surface 11b of the adhesive layer 11 itself can be kept dark, making it difficult for weeds to grow, thus helping to prevent weed growth.

[0040] Furthermore, the adhesive tape 1 for asphalt paving can also be produced on-site during the construction process, rather than in a factory as in the embodiment described above. In this case, the double-sided adhesive tape 4 for asphalt paving, which consists of either an adhesive layer 11 or an adhesive reinforcement section 12 provided in the adhesive layer 11, is applied to the road surface with the release liner 13 removed, as described above, for use as a finish for asphalt paving or simple paving, or for sealing the boundary between existing surface layers. At that time, the double-sided adhesive tape 4 for asphalt paving is heated and melted with a flame such as a burner, and hard particles 14 are sprinkled on its surface, causing the hard particles 14 to sink into the molten adhesive layer 11. After the temperature has decreased, the worker steps on it with their feet or presses it with a roller to press the hard particles 14 onto the adhesive layer 11, and then the excess hard particles 14 are swept away and removed with a broom or the like, completing the adhesive tape 1 for asphalt paving in the construction process.

[0041] Furthermore, the composition (straight asphalt, synthetic rubber adhesive, mineral oil, and other components) and mixing ratio of the adhesive layer 11 and the adhesive strengthening section 12, as well as the material of the release liner 13, are not limited to the embodiments described above and can be appropriately modified within the scope of the present invention. As mentioned above, the affinity between the synthetic rubber adhesive used in the adhesive layer 11 and the adhesive strengthening section 12 will be higher if they have the same components, but they may also have different components. The thickness, width, length of the adhesive layer and the shape of the product can also be appropriately modified depending on the application.

[0042] Furthermore, in addition to ceramic particles as described in the above embodiment, one or more mixtures of materials selected from oxidized slag, natural or artificial silica sand (quartz sand), mountain sand, river sand, calcium carbonate (limestone CaCO3), lime, stone powder, recycled asphalt mixture material (asphalt lumps), fly ash (coal ash), recycled roof tile sand, etc., can be used for the hard particles 14. The particle size of the hard particles 14 can be appropriately determined according to the thickness of the adhesive layer. If the hard particles 14 are colored, the adhesive tape 1 for asphalt pavement of the present invention can be used not only for its original purpose of asphalt pavement, but also as road line tape or design tape.

[0043] Furthermore, the configuration of each part of the adhesive tape for asphalt paving according to the present invention, its production method, and its applications are not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the present invention. [Industrial applicability]

[0044] This invention, when used in asphalt pavement repair work, contributes to increased efficiency and reduced costs in repair work, improves the quality and durability of the repaired asphalt pavement, and reduces maintenance costs. Furthermore, by utilizing the rough surface texture after application, this invention can be used to suppress tire slippage, and when colored hard particles are used, it can also be used as road line tape or design tape. [Explanation of Symbols]

[0045] 1… Adhesive tape for asphalt paving 11…Adhesive layer 12…Adhesion reinforcement part 13…Release Liner 14…Hard particles 2. (2') ... Asphalt pavement, (Simple asphalt pavement) 21A...Existing surface layer 21As…Pavement joint section 21B…New surface layer 211… Paved section X...Asphalt pavement structure

Claims

1. An adhesive tape for asphalt paving, mainly consisting of a sheet-like adhesive layer with adhesive properties on both sides, formed from a mixture of straight asphalt and a synthetic rubber-based adhesive, An adhesive tape for asphalt paving, characterized in that a removable release liner can be attached to the back surface of the adhesive layer, and hard particles are attached to the entire front surface of the adhesive layer.

2. The adhesive tape for asphalt paving according to claim 1, wherein the particle size of the hard particles is 0.6 to 5.0 mm.

3. The adhesive tape for asphalt pavement according to claim 2, wherein the hard particles are a mixture of one or more selected from ceramic, oxidized slag, natural or artificial silica sand, mountain sand, river sand, calcium carbonate, lime, stone powder, recycled asphalt mixture material, fly ash, and recycled roof tile sand.

4. The adhesive tape for asphalt pavement according to any one of claims 1 to 3, wherein the back surface of the adhesive layer is provided with an adhesive strengthening portion made of the same or different synthetic rubber adhesive as the synthetic rubber adhesive constituting the adhesive layer.

5. A method for producing an adhesive tape for asphalt paving, which mainly consists of a sheet-like adhesive layer with adhesive properties on both sides, formed primarily from a mixture of straight asphalt and a synthetic rubber-based adhesive, A method for producing an adhesive tape for asphalt paving, characterized by comprising the steps of: scattering heated hard particles over the entire surface of the adhesive layer; and removing excess hard particles from the surface of the adhesive layer.

6. A method for producing an adhesive tape for asphalt paving, which mainly consists of a sheet-like adhesive layer with adhesive properties on both sides, formed primarily from a mixture of straight asphalt and a synthetic rubber-based adhesive, A method for producing an adhesive tape for asphalt pavement, comprising the steps of: heating and melting the adhesive layer with its reverse side attached to the road surface; scattering hard particles over the entire surface of the adhesive layer; pressing the adhesive layer from the surface side; and removing excess hard particles from the surface of the adhesive layer.

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