Composition for heated bridge deck coating structures using synthetic rubber and coating method using the same

Abstract

The present invention relates to a composition for a heated bridge deck coating structure using synthetic rubber and a coating method using the same. More specifically, the invention relates to a composition for a heated bridge deck coating structure using synthetic rubber and a coating method using the same, which is improved to enhance waterproofing, durability, interfacial adhesion, and crack resistance by forming a heated asphalt-based coating material modified with synthetic rubber into a single layer structure with a thickness of 2 mm as a bridge deck waterproofing structure formed on the upper surface of a bridge deck plate, and applying only a geogrid as the core substrate.

Description

Technology Field

[0001] The present invention relates to a composition for a heated bridge deck coating structure using synthetic rubber and a coating method using the same. More specifically, the invention relates to a composition for a heated bridge deck coating structure using synthetic rubber and a coating method using the same, which is improved to enhance waterproofing, durability, interfacial adhesion, and crack resistance by forming a heated asphalt-based coating material modified with synthetic rubber into a single layer structure with a thickness of 2 mm as a bridge deck waterproofing structure formed on the upper surface of a bridge deck plate, and applying only a geogrid as the core substrate. Background Technology

[0002] With the recent rapid expansion of bridges and overpasses, ensuring the long-term durability of bridge deck pavements is emerging as an important technical challenge.

[0003] Unlike general earthwork sections, the bridge deck paving has a structure in which a waterproofing layer is formed on top of the concrete deck slab, and then an asphalt paving layer is constructed on top of it.

[0004] In this case, the waterproofing layer is a key element in preventing rebar corrosion and concrete deterioration by blocking the penetration of moisture and chloride ions from the outside.

[0005] Conventional bridge deck waterproofing methods are broadly classified into sheet type, membrane type, penetration type, and composite type.

[0006] Among these, the membrane method has been widely used due to its advantages of excellent construction continuity and ease of application even to complex shapes.

[0007] However, in actual field conditions, bridge decks are continuously subjected to complex stresses such as repeated vehicle loads, vibrations, impacts, shear forces, and shrinkage and expansion due to temperature changes; therefore, relying solely on the formation of a simple coating has limitations in securing long-term waterproofing performance.

[0008] Accordingly, in conventional technology, a multi-layer structure was often adopted to supplement waterproof performance.

[0009] For example, it was common practice to sequentially laminate a primer layer, a primary coating layer, a reinforcing layer, a secondary coating layer, a protective layer, etc.

[0010] While this multi-layered structure could theoretically ensure waterproof stability, it had the following problems.

[0011] First, the complexity of the process increased construction time and increased the likelihood of poor adhesion between layers. In particular, if fine voids or lifting occurred at the interlayer interfaces, moisture could penetrate between the layers, accelerating delamination.

[0012] Second, the material properties of each layer were different, and the difference in the coefficient of thermal expansion due to temperature change caused interfacial shear stress to concentrate, which led to cracking and delamination.

[0013] Third, as the total thickness of the multilayer structure increased, it was difficult to ensure construction uniformity, and localized stress concentration and flow problems occurred due to thickness variations.

[0014] Fourth, by applying various reinforcing materials such as non-woven fabric, mesh, and grids for reinforcement, material management and construction quality control became complicated, and in some cases, structural integrity was actually reduced.

[0015] Consequently, conventional technology evolved by increasing the number of layers to improve waterproofing performance, but it entailed new problems such as the possibility of construction defects due to increased structural complexity, interfacial separation, and increased maintenance costs. Prior art literature

[0016] Korean Registered Patent No. 10-1835270 (Feb. 27, 2018), Waterproofing method using coatings and sheets for bridge decks and concrete structures The problem to be solved

[0017] The present invention was created to solve the various problems of the prior art as described above, and its main purpose is to provide a composition for a heated bridge deck coating structure using improved synthetic rubber and a coating method using the same, which can improve waterproofing, durability, interfacial adhesion, and crack resistance by forming a heated asphalt-based coating material modified with synthetic rubber as a single layer structure with a thickness of 2 mm as a bridge deck waterproofing structure formed on the upper part of a bridge deck plate, and applying only a geogrid as the core substrate. means of solving the problem

[0018] The present invention provides a heated bridge deck coating structure using synthetic rubber, characterized by comprising, as a means to achieve the above-mentioned purpose, a coating layer (20) with a thickness of 2 mm applied to a concrete floor surface (10), a geogrid (30) which is a central substrate laid on top of the coating layer (20), and an asphalt paving layer (40) laid on top of the geogrid (30) and the coating layer (20).

[0019] In addition, the present invention also provides a composition for a heated bridge deck coating structure using synthetic rubber, characterized in that the coating layer (20) described above is formed by coating with a coating composition composed of 10 to 18 weight% of carboxylated nitrile butadiene rubber, 5 to 10 weight% of styrene-isoprene-styrene block copolymer, 2 to 6 weight% of liquid polybutadiene, 2 to 6 weight% of surface-treated nano silica, 5 to 10 weight% of meta kaolin, 2 to 4 weight% of polyphosphazene, and the remainder being oxidized asphalt.

[0020] In addition, the present invention also provides a composition for a heated bridge deck coating structure using synthetic rubber, characterized in that the geogrid (30) described above is formed from a raw material consisting of 10 to 20 weight% polypropylene (PP), 5 to 15 weight% chopped glass fiber, 1 to 3 weight% carbon black, 0.2 to 1 weight% dilauryl thiodipropionate, and the remainder high-density polyethylene (HDPE).

[0021] In addition, the present invention also provides a coating method characterized by comprising: a pretreatment step of a concrete floor surface for precisely preparing the concrete floor surface on which a waterproof layer is to be formed; a coating composition manufacturing step for making the coating composition described in claim 2; a heating and 2mm coating formation step of applying the manufactured coating composition onto the concrete floor surface using dedicated spraying equipment while maintaining the temperature at 170~185℃; a geogrid laying and integration step of laying a geogrid, which is a core substrate, on top while the coating layer still maintains fluidity; and a step of forming an upper asphalt pavement layer while the geogrid is integrated. Effects of the invention

[0022] According to the present invention, as a bridge deck waterproofing structure formed on the upper surface of a bridge deck, a heated asphalt-based coating material modified with synthetic rubber is formed as a single layer structure with a thickness of 2 mm, and only a geogrid is applied as the core substrate, thereby obtaining an improved effect to enhance waterproofing, durability, interfacial adhesion, and crack resistance. Brief explanation of the drawing

[0023] FIG. 1 is an exemplary cross-sectional view showing a film structure according to the present invention. Figures 2 and 3 are sample photographs showing examples of on-site construction. Specific details for implementing the invention

[0024] Hereinafter, preferred embodiments according to the present invention will be described in more detail with reference to the attached drawings.

[0025] The heated bridge deck coating structure using synthetic rubber according to the present invention is characterized by being configured to enhance watertightness and adhesion by forming an elastic network of synthetic rubber and commercializing the synthetic rubber network with asphalt simply by laying a single heated coating and a high-strength geogrid as a core substrate on top of it.

[0026] In particular, the present invention ensures uniform and high waterproof properties without phase separation by forming a dense filling mesh based on a triple network using only a 2mm thick coating film, a primary network made of carboxylated nitrile butadiene rubber, a secondary network made of styrene-isoprene-styrene block copolymer, and a tertiary network made of liquid polybutadiene.

[0027] More specifically, as shown in the example of FIG. 1, the heated bridge deck coating structure using synthetic rubber according to the present invention comprises a coating layer (20) with a thickness of 2 mm applied to a concrete floor surface (10), a geogrid (30) which is a central substrate laid on top of the coating layer (20), and an asphalt paving layer (40) laid on top of the geogrid (30) and the coating layer (20).

[0028] At this time, the coating composition constituting the coating layer (20) is composed of 10 to 18 weight% of carboxylated nitrile butadiene rubber, 5 to 10 weight% of styrene-isoprene-styrene block copolymer, 2 to 6 weight% of liquid polybutadiene, 2 to 6 weight% of surface-treated nano silica, 5 to 10 weight% of meta kaolin, 2 to 4 weight% of polyphosphazene, and the remainder being oxidized asphalt.

[0029] In this case, carboxylated nitrile butadiene rubber forms a micro-crosslinked structure within the asphalt to improve tensile strength and oil resistance, strengthens interfacial bonding by forming hydrogen bonds with hydroxyl groups on the concrete surface, and plays a role in suppressing fatigue crack propagation, particularly under repeated loading conditions.

[0030] In addition, the styrene-isoprene-styrene block copolymer imparts elastic recovery, controls high-temperature fluidity, and improves low-temperature flexibility.

[0031] In addition, liquid polybutadiene ensures fluidity upon heating, increases elasticity after cooling, and enhances micropore penetration, thereby improving concrete interfacial adhesion.

[0032] In addition, surface-treated nanosilica fills micropores within the coating film to improve water tightness and forms a dense network that inhibits chloride ion diffusion, and is a key component for enhancing water impermeability, which is particularly important in 2mm thin film structures.

[0033] Furthermore, Meta Kaolin acts as a reactive filler that densifies the internal structure of the coating film, improves thermal stability, and increases penetration resistance by elongating moisture diffusion pathways in a zigzag pattern.

[0034] Furthermore, polyphosphazene is a special polymer that simultaneously imparts heat resistance and flame retardancy; it exhibits excellent decomposition stability even in high-temperature asphalt environments and improves thermal shock resistance.

[0035] In addition, oxidized asphalt contributes to ensuring foundation waterproofing.

[0036] Each of these components is formulated to ensure concrete interfacial adhesion, water resistance, and curing stability.

[0037] In addition, the present invention may further add 5.5 parts by weight of alkyl ketene dimer, 4.5 parts by weight of hydrotalcite, and 5 parts by weight of polycarbosilane to 100 parts by weight of the coating composition.

[0038] In this case, the alkyl ketene dimer reacts with hydroxyl groups inside the concrete to form a beta-keto ester bond and coats the pore walls with long-chain alkyl groups to achieve superhydrophobicity, improves air permeability by not blocking the pores, suppresses efflorescence, and contributes to preventing the penetration of chlorides.

[0039] In addition, hydrotalcite is a layered double hydroxide also known as an 'anion exchange clay', and it has the ability to 'exchange' by absorbing chloride ions, which are the main culprits of concrete corrosion, and releasing anti-corrosion components instead, thus contributing to the prevention of salt damage and the prevention of concrete carbonation.

[0040] In addition, polycarbosilane is an organosilicon polymer and serves as a precursor component that transforms into ceramic upon heat treatment. It is a component capable of simultaneously providing the flexibility of organic materials and the toughness of ceramics, and provides extreme chemical stability after curing, resulting in high-strength adhesion, heat resistance, and chemical resistance.

[0041] Meanwhile, to the above film composition, 1.5 parts by weight of graphene oxide, 0.5 parts by weight of HALS (Hindered Amine Light Stabilizer), 3.5 parts by weight of polycarbodiimide, 4.5 parts by weight of cardanol-modified epoxy, and 4.5 parts by weight of silanetriol may be further added.

[0042] In this case, graphene oxide achieves a transmittance that is virtually zero because the very thin, plate-like structure of graphene forms a 'tortuous path' within the film, causing water molecules or chloride ions to be blocked by this maze and extending their movement paths.

[0043] Also, HALS (Hindered Amine Light Stabilizer) is a UV stabilizer.

[0044] In particular, polycarbodiimide is a moisture-trapping additive that reacts with moisture to form urea bonds, removing internal moisture and inhibiting hydrolysis, thereby contributing to securing strong bonding strength.

[0045] In addition, Cardanol-modified epoxy is a natural ingredient with long aliphatic chains, which perfectly compensates for the 'brittleness' that is a chronic problem of conventional epoxy. Therefore, it contributes to securing flexibility and crack resistance and strengthening adhesion to wet surfaces.

[0046] In addition, silanetriol is a water-soluble organosilicon compound with a molecular size smaller than a nanometer, which modifies the concrete structure itself to be hydrophobic. Therefore, it contributes to the 'formation of penetrating crystals' that transform the coating itself into a waterproofing agent.

[0047] On the other hand, the geogrid (30) is produced by melting and mixing raw materials at 180–220°C in a twin-screw extruder and then extruding them into a sheet form through a flat die. Afterward, a grid pattern is formed through a punching process in a semi-cured state, and a uniaxial or biaxial stretching process is performed to induce molecular orientation, thereby increasing the tensile strength to 30–80 kN / m. Then, after cooling, it is wound up to produce a roll.

[0048] Here, the raw materials for forming the geogrid (30) consist of 10 to 20 weight percent polypropylene (PP), 5 to 15 weight percent chopped glass fiber, 1 to 3 weight percent carbon black, 0.2 to 1 weight percent dilauryl thiodipropionate, and the remainder high-density polyethylene (HDPE).

[0049] In this case, polypropylene is added as an auxiliary resin for controlling impact strength and stiffness to complement the mechanical properties of the base resin, the HDPE matrix. PP has a higher flexural modulus and superior heat resistance than HDPE, so it plays a role in improving the initial stiffness of the geogrid. In addition, it facilitates molecular orientation during extrusion and stretching processes, contributing to the improvement of tensile strength. In particular, while there is a concern that brittleness may increase at low temperatures when HDPE is used alone, low-temperature impact strength and structural stability can be simultaneously improved by mixing PP in the range of 10 to 20 weight percent.

[0050] In addition, glass fiber staples are inorganic reinforcing materials designed to significantly improve the tensile strength and elastic modulus of geogrids. Due to their very high tensile strength and elastic modulus, glass fibers function to effectively distribute loads and suppress crack propagation when uniformly dispersed within a polymer matrix. In particular, they play a role in blocking crack propagation occurring beneath the waterproofing layer, thereby enhancing the structural reliability of double waterproofing structures. Furthermore, glass fibers have a low coefficient of thermal expansion, which has the effect of suppressing dimensional deformation caused by temperature changes.

[0051] Furthermore, carbon black is added to block ultraviolet rays and enhance long-term weather resistance. When HDPE and PP are exposed to ultraviolet (UV) light, photo-oxidation causes molecular chain cleavage, which can lead to strength degradation and cracking over the long term. However, carbon black functions to block UV penetration into the polymer by absorbing UV rays and converting them into thermal energy. Additionally, carbon black offers the secondary benefit of improving fatigue resistance by dispersing shear stress.

[0052] In addition, dilauryl thiodipropionate is necessary to ensure thermal oxidation stability and maintain long-term durability of geogrids. Although thermal oxidation reactions may occur in HDPE and PP during high-temperature extrusion and stretching processes (180–230°C), which can lead to a decrease in molecular weight and a deterioration in mechanical properties, dilauryl thiodipropionate suppresses these degradation reactions by capturing free radicals or decomposing peroxides.

[0053] Furthermore, high-density polyethylene, as the base resin for geogrids, exhibits excellent tensile strength and chemical resistance due to its high degree of crystallinity and strong intermolecular bonding. In particular, it possesses the characteristic of relatively low creep deformation under long-term loading conditions. Geogrids applied beneath waterproofing layers in underground structures, bridge decks, and rooftop slabs are subjected to continuous compressive and tensile stresses; therefore, high crystallinity and dimensional stability are required to maintain shape stability over a long period in such environments. Additionally, HDPE has an extremely low water absorption rate and excellent chemical stability in acidic and alkaline environments, resulting in minimal deterioration even when in contact with concrete structures.

[0054] In addition, in the present invention, 4.5 parts by weight of aramid nanopulp, 3.5 parts by weight of ionomer resin, 5 parts by weight of Cera Alba, 4.5 parts by weight of organomodified montmorillonite, and 4.5 parts by weight of dicyclopentadiene may be further added to 100 parts by weight of the raw material.

[0055] In this case, aramid nanopulp is a form in which aramid fibers are finely broken down into nano-sized particles and dispersed. It acts as trillions of tiny 'reinforcements' within the coating film, physically holding the polymer chains tightly. In other words, it significantly increases crack resistance.

[0056] In particular, ionomer resin is a thermoplastic resin with partially ionic bonding that forms ion clusters, providing self-healing capabilities in the event of cracking and contributing to enhanced waterproofing properties by blocking moisture penetration pathways.

[0057] In addition, Cera Alba is composed of myrisyl palmitate, cerotic acid, esters, and high-carbon paraffins, which promote emulsification, increase elastic cushioning, and contribute to enhancing water resistance and water pressure resistance.

[0058] In addition, nanoclay (Organomodified Montmorillonite) blocks degradation caused by ultraviolet rays and suppresses thermal deformation to prevent layer separation, while enhancing water resistance, water resistance, and water pressure resistance.

[0059] In addition, dicyclopentadiene has very low viscosity, allowing it to penetrate perfectly even into fine crevices. As a thermosetting resin with excellent moisture resistance after curing, it contributes to maximizing anchoring properties and ensuring water resistance and water pressure resistance.

[0060] The coating method according to the present invention, composed of such a structure, is as follows.

[0061] A pretreatment step is performed on the concrete floor surface. This step involves precisely preparing the concrete floor surface where the waterproofing layer will be formed.

[0062] In this stage, the following tasks are performed.

[0063] The present invention includes removing laitance, removing surface peeling and weak points, removing dust, oil, moisture and other contaminants, and repairing cracks and defects, and is characterized by the fact that a synthetic rubber-based coating forms a chemical and physical bond with the concrete surface, so it is important to secure open pores on the concrete surface.

[0064] To this end, blast treatment or grinding treatment is performed to form a surface roughness, and the surface roughness is managed to maximize the mechanical anchoring effect of the coating film.

[0065] In addition, the moisture content of the floor surface must be managed below a certain level (e.g., 6% or less), and if there is excessive residual moisture, bubbles may form or adhesion may be reduced at the interface with the coating film, so it must be stabilized through hot air drying or natural drying.

[0066] In addition, a primer may be applied if necessary; on pre-treated concrete floor surfaces, it is preferable to use a low-viscosity penetrating resin to improve adhesion with the synthetic rubber-based coating. Of course, this is merely an optional step.

[0067] Next, the step of manufacturing the film composition is performed. This step is the step of making the film composition described earlier.

[0068] In this case, the coating composition is first prepared by heating oxidized asphalt to approximately 160–180°C to ensure fluidity. Subsequently, carboxyl-modified nitrile butadiene rubber is added, and high-speed shear mixing is performed. During this process, rubber particles are finely dispersed within the asphalt matrix, and some swell to form a continuous phase network. Next, a styrene-isoprene-styrene block copolymer is added to form a dual-elastic network. Following this, liquid polybutadiene is added to control fluidity and improve interfacial penetration. Subsequently, surface-modified nanosilica and metakaolin are dispersed and added. These inorganic fine particles fill the micropores within the coating and form a barrier effect that delays the diffusion pathways of moisture and chloride ions. Finally, polyphosphazene is added to impart heat resistance and thermal shock resistance. Polyphosphazene maintains a stable molecular structure even in heated environments, thereby enhancing long-term resistance to degradation. Mixing is continued for about 30 to 60 minutes to ensure uniform viscosity and a state without phase separation.

[0069] Then, a heating and 2mm film formation step is performed. This step involves applying the manufactured film composition onto a concrete floor surface using dedicated spraying equipment while maintaining the temperature at approximately 170 to 185°C.

[0070] The most important factor during application is ensuring an accurate thickness of 2 mm. Since the present invention has a single-layer structure, thickness deviations directly affect structural performance. Therefore, it is desirable to ensure uniformity within ±0.2 mm using an automatic thickness control device.

[0071] When the coating is applied, the synthetic rubber network penetrates the micropores of the concrete surface, forming mechanical anchoring, and the carboxyl groups (-COOH) interact with calcium ions in the concrete to strengthen interfacial bonding.

[0072] Next, the geogrid laying and integration step is performed. In this step, the geogrid, which serves as the core substrate, is precisely laid on top while the coating layer still maintains its fluidity. The geogrid has a grid-like structure with excellent tensile strength and is pressed with a compression roller to adhere closely to the surface of the coating. During this process, the coating composition penetrates into the openings of the geogrid to form a mechanical bond.

[0073] Geogrids serve to disperse stress within the coating film and absorb tensile and shear stresses caused by repeated vehicle loads. In addition, they provide a bridging effect that blocks crack propagation when cracks occur.

[0074] Finally, the asphalt pavement layer formation step is performed. In this step, the upper asphalt pavement layer is laid while the geogrid is integrated.

[0075] At this time, the temperature of the pavement asphalt is maintained at approximately 150–170°C, and a partial thermal fusion effect occurs with the underlying film, increasing interfacial integrity. After paving, roller compaction is performed to stabilize the entire structure.

[0076] As explained above, the present invention has improved features that can enhance waterproofing, durability, interfacial adhesion, and crack resistance by forming a single layer structure with a thickness of 2 mm using a heat-type asphalt-based coating material modified from synthetic rubber as a bridge deck waterproofing structure formed on the upper part of a bridge deck, and applying only a geogrid as the core substrate.

[0077] In addition, Figures 2 and 3 show sample photos of on-site work showing examples of construction.

[0078] In this case, Fig. 2 is an example of forming a film layer by applying a film composition, and Fig. 3 is a photograph of laying a geogrid. However, the work sites are different locations.

[0079] To confirm the characteristics of the present invention as described above, tests were conducted according to Table 1 below, and the results were compared and displayed along with the specifications (standard values).

[0080]

[0081] According to Table 1, it can be confirmed that when using the waterproofing method according to the present invention, there are excellent characteristics that exceed the specifications.

[0082] Meanwhile, the present invention forms a coating layer (20) made of a heated asphalt-based coating material modified from synthetic rubber by applying it onto a concrete floor surface (10), wherein the concrete floor surface (10) is pretreated as follows before applying the coating layer (20).

[0083] That is, blasting or grinding is performed to remove laitance, weak layers, and contaminants present on the surface of the concrete floor (10), and as a result, fine irregularities and open pores are formed on the surface of the concrete floor (10), so that when the coating layer (20) is applied thereafter, the coating material can penetrate and fill into the fine irregularities and open pores.

[0084] Next, the coating composition is applied to the concrete floor surface (10) using dedicated spraying equipment while maintaining the temperature at 170~185℃ to form a coating layer (20) with a thickness of 2mm, and while the coating layer (20) is still fluid, a geogrid (30), which is a core material, is laid on top of the coating layer (20), and the coating layer (20) is integrated by applying pressure so that it partially protrudes and penetrates upward through the opening of the geogrid (30). Afterward, an asphalt paving layer (40) is laid on top of the geogrid (30) and the coating layer (20) while they are integrated.

[0085] The present invention allows the fine irregularities and open pores formed by the pretreatment of the concrete floor surface (10) to be penetrated and filled by the coating material when the coating layer (20) is applied, thereby forming “mechanical anchoring (interlocking)” between the concrete floor surface (10) and the coating layer (20). As a result, the shear stress generated at the interface due to repeated vehicle loads is dispersed, and the initiation of local peeling of the coating layer (20) is suppressed.

[0086] Therefore, the interfacial adhesion (shear adhesion) between the concrete floor surface (10) and the coating layer (20) is improved, reducing the possibility of peeling / lifting defects during long-term use. In addition, even if the coating layer (20) has a single layer (2mm) structure, the waterproofing reliability is improved by interfacial anchoring.

[0087] In addition, the step of laying and integrating a geogrid (30) after forming a coating layer (20) can be specified as follows.

[0088] Immediately after forming a coating layer (20) with a thickness of 2 mm on a concrete floor surface (10), a geogrid (30) is laid on top of the coating layer (20) during the time interval while the coating layer (20) still maintains its fluidity, and immediately after laying, the geogrid (30) is pressed downward using a roller or leveling equipment. At this time, the pressing is performed not merely to the extent that the geogrid (30) simply contacts the surface of the coating layer (20), but so that the coating layer (20) penetrates and fills upward through the opening of the geogrid (30), and the geogrid (30) is "mechanically fixed (locked)" within the coating layer (20).

[0089] After the geogrid (30) is integrated with the coating layer (20) as described above, an asphalt paving layer (40) is paved over the geogrid (30) and the coating layer (20).

[0090] In this invention, by applying pressure immediately after laying the geogrid (30), the coating layer (20) penetrates upward and fills through the opening of the geogrid (30), thereby forming a large interlocking connection between the geogrid (30) and the coating layer (20). This interlocking connection causes the geogrid (30) to act in a direction that distributes the load when tensile / shear stress occurs in the coating layer (20) due to micro-cracks or deformation of the bridge deck plate.

[0091] Therefore, interlayer slip and localized delamination between the geogrid (30) and the coating layer (20) are suppressed, thereby improving durability. In addition, stress distribution is improved when cracks occur, thereby increasing crack resistance.

[0092] In another embodiment of the present invention, the asphalt paving layer (40) is paved after the geogrid (30) is integrated with the coating layer (20), and the paving time and temperature conditions are specified as follows.

[0093] Immediately after the geogrid (30) is integrated with the coating layer (20), an asphalt mixture is laid to form an asphalt pavement layer (40) in a state before the coating layer (20) is completely hardened and brittle (e.g., before the surface is completely cooled or while adhesiveness remains). At this time, the laying and compaction of the asphalt pavement layer (40) are performed so that a certain amount of heat is transferred from the top of the geogrid (30) and the top of the coating layer (20), thereby stabilizing the geogrid (30), the coating layer (20), and the asphalt pavement layer (40) in a state of thermal and physical contact.

[0094] In this invention, when the asphalt paving layer (40) is laid at a time when the adhesiveness of the coating layer (20) remains, thermal fusion and adhesive bonding are promoted at the contact interface between the upper part of the coating layer (20) and the lower part of the asphalt paving layer (40), and local voids on the upper part of the geogrid (30) are reduced. As a result, stress concentration is relieved when the load of the upper paving layer (40) is transferred to the coating layer (20) through the geogrid (30).

[0095] Accordingly, the risk of interlayer delamination and leakage caused by voids at the upper interface of the coating layer (20) is reduced, thereby improving waterproofing reliability. In addition, the adhesion between the paving layer (40) and the coating layer (20) is improved, thereby suppressing interface deterioration under long-term repetitive loading.

[0096] Meanwhile, an adhesion enhancer may be applied between the geogrid (30) and the asphalt pavement layer (40) to improve the adhesion between them.

[0097] The above adhesion promoter may comprise 62 parts by weight of water, 22 parts by weight of phenylimidizol, 8 parts by weight of ammonium persulfate, and 8 parts by weight of sodium bicarbonate.

[0098] Phenylimidisol acts as an adhering agent, imparts adhesion, and promotes curing, ammonium persulfate acts as a catalyst, and sodium bicarbonate acts as a buffer.

[0099] The reason for limiting the constituent materials and components and the numerical values ​​of the mixing ratio as described above is that, based on the analysis of test results after repeated failures by the inventor, the optimal effect was achieved at the aforementioned limited compositional components and numerical ratios. Explanation of the symbols

[0100] 10: Concrete floor surface 20: Film layer 30: Geogrid 40: Asphalt pavement layer

Claims

Claim 1 A composition for a heated bridge deck coating structure using synthetic rubber comprising a coating layer (20) with a thickness of 2 mm applied to a concrete floor surface (10), a geogrid (30) which is a core substrate laid on top of the coating layer (20), and an asphalt paving layer (40) laid on top of the geogrid (30) and the coating layer (20); wherein the coating layer (20) comprises 10-18% by weight of carboxylated nitrile butadiene rubber, 5-10% by weight of styrene-isoprene-styrene block copolymer, 2-6% by weight of liquid polybutadiene, 2-6% by weight of surface-treated nanosilica, and metakaolin A coating composition is formed by coating with 5~10% by weight of polyphosphazene, 2~4% by weight of polyphosphazene, and the remainder being oxidized asphalt, wherein, based on 100 parts by weight of the coating composition, 5.5 parts by weight of alkyl ketene dimer, 4.5 parts by weight of hydrotalcite, 5 parts by weight of polycarbosilane, 1.5 parts by weight of graphene oxide, 0.5 parts by weight of HALS (Hindered Amine Light Stabilizer), 3.5 parts by weight of polycarbodiimide, 4.5 parts by weight of cardanol-modified epoxy, and 4.5 parts by weight of silanetriol are further added; The geogrid (30) is composed of 10-20% by weight of polypropylene (PP), 5-15% by weight of chopped glass fiber, 1-3% by weight of carbon black, and 0% of dilauryl thiodipropionate.A composition for a heated bridge deck coating structure using synthetic rubber, characterized by being molded from a raw material consisting of 2~1% by weight and the remainder being high-density polyethylene (HDPE), wherein, based on 100 parts by weight of the raw material, 4.5 parts by weight of aramid nanopulp, 3.5 parts by weight of ionomer resin, 5 parts by weight of Cera Alba, 4.5 parts by weight of organomodified montmorillonite, and 4.5 parts by weight of dicyclopentadiene are further added. Claim 2 delete Claim 3 delete Claim 4 A coating method using a composition for a heated bridge deck coating structure using synthetic rubber, characterized by comprising: a pretreatment step of a concrete floor surface for precisely preparing the concrete floor surface to be formed with a waterproof layer; a coating composition manufacturing step for making the coating composition described in claim 1; a heating and 2mm coating formation step of applying the manufactured coating composition onto the concrete floor surface using dedicated spraying equipment while maintaining the temperature at 170~185℃; a geogrid laying and integration step of laying the geogrid, which is the core material described in claim 1, on top while the coating layer still maintains fluidity; and a step of forming an upper asphalt pavement layer while the geogrid is integrated.

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