Independent waterproof bonding layer structure of concrete bridge floor and construction method of independent waterproof bonding layer structure
By adopting a three-layer structure independent waterproof bonding layer on the concrete bridge deck, including the base bonding layer, flexible reinforcement layer and reinforced bonding layer, the problems of poor bonding effect and easy to become brittle and hard between the existing waterproof bonding layer structures are solved, and higher waterproof performance and durability are achieved, and the service life of the bridge is extended.
Patent Information
- Application Number
- CN202411895332.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-21
- Publication Date
- 2025-03-11
AI Technical Summary
The existing concrete bridge deck waterproof bonding layer structure has poor bonding between layers and the asphalt bonding layer is prone to become brittle and hard and cracked, resulting in water seepage and corrosion of steel bars within the structure, shortening the service life of the bridge.
A three-layer structure independent waterproof bonding layer includes a base bonding layer, a flexible reinforcement layer and a reinforcement bonding layer. The flexible reinforcement layer consists of materials such as asphalt, styrene butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, etc. The reinforced bonding layer uses two-component polyurethane, and nano zinc oxide, nanomontmorillonite and conductive fibers are added to the flexible reinforcement layer to improve waterproofing performance and self-healing ability.
Through the three-layer waterproof bonding layer, the stability and durability of the waterproof bonding layer are significantly improved, cracking is reduced, waterproof performance and bonding strength are enhanced, and the service life of the bridge is extended.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waterproofing in bridge engineering, and in particular to an independent waterproof bonding layer structure for a concrete bridge deck and a construction method thereof. Background Art
[0002] In bridge construction, especially on concrete bridge decks, one or more waterproof bonding layers are usually installed on the bridge deck to improve the service life and driving safety of the bridge deck. This can not only effectively prevent the corrosion of steel bars caused by water penetration, but also enhance the adhesion between the asphalt pavement layer and the bridge deck, reducing the occurrence of rutting, cracks and other problems.
[0003] At present, the asphalt waterproof bonding layer materials mainly include epoxy asphalt, SBS modified asphalt, rubber asphalt, etc. There are two main problems in actual use. First, the interlayer bonding effect is not good. The horizontal push and shear force generated by vehicle braking can easily cause bulges, potholes and other defects in the bridge deck pavement layer. Second, the asphalt bonding layer is prone to become brittle and hard, and cracks will occur, causing water seepage inside the structure and corrosion of steel bars, causing irreversible damage to the beam body and shortening the service life of the bridge. Summary of the invention
[0004] In order to improve the stability and durability of the waterproof bonding layer structure of a concrete bridge deck, the present application provides an independent waterproof bonding layer structure for a concrete bridge deck and a construction method thereof.
[0005] In a first aspect, the present application provides an independent waterproof bonding layer structure for a concrete bridge deck, which adopts the following technical solution: A concrete bridge deck independent waterproof bonding layer structure comprises a base bonding layer, a flexible reinforcement layer and a reinforcement bonding layer, wherein the flexible reinforcement layer is located between the base bonding layer and the reinforcement bonding layer, and the flexible reinforcement layer comprises the following raw materials in parts by weight: 50-60 parts of asphalt, 30-40 parts of styrene-butadiene rubber, 20-30 parts of hydrogenated styrene-butadiene block copolymer, 10-20 parts of hydrated silica, 5-10 parts of tackifier, 5-10 parts of coupling agent, and 10-20 parts of reinforcing filler.
[0006] By adopting the above technical solution, a flexible reinforcement layer is laid between the base bonding layer and the enhanced bonding layer, which can absorb the pressure changes from vehicle loads, reduce the shear displacement deformation of the waterproof bonding layer structure, and reduce cracking. The base bonding layer is directly bonded to the surface of the road base, and the surface of the enhanced bonding layer is paved with asphalt mixture. Through the two-layer bonding layer structure, the bonding between the asphalt mixture and the road surface can be strengthened, the interlayer stability of the waterproof bonding layer can be enhanced, and the road performance and durability of the concrete bridge deck pavement structure can be improved.
[0007] Asphalt and styrene-butadiene rubber are used in combination as raw materials for the flexible reinforcement layer to form a waterproof barrier, effectively preventing water penetration, and utilizing the excellent waterproof properties of styrene-butadiene rubber to form a dense waterproof layer, thereby improving the waterproof effect of the waterproof bonding layer structure. The elasticity of styrene-butadiene rubber enables the flexible reinforcement layer to absorb and disperse the stress between the asphalt pavement layer and the bridge deck, reduce stress concentration caused by temperature changes or vehicle loads, reduce shear deformation, and improve the stability and durability of the waterproof bonding layer structure and the bridge deck asphalt pavement structure.
[0008] Hydrated silica has good stability and reinforcement ability, and the main chain of hydrogenated styrene-butadiene block copolymer has high resistance to light and oxygen aging, thermal stability and weather resistance. It can improve the stress relaxation ability and low-temperature flexibility of asphalt, reduce the brittleness of traditional asphalt bonding layers, reduce the brittle cracking of asphalt bonding layers under tension and load conditions, and improve the stability and durability of the waterproof bonding layer structure.
[0009] Hydrogenated styrene-butadiene block copolymer, hydrated silica and coupling agent can form a spatial structure in asphalt, which can hinder the transformation of elastic components in asphalt into viscous components, reduce the temperature sensitivity of asphalt, slow down the penetration of oxygen and moisture in the waterproof bonding layer structure, and thus improve the high temperature stability and anti-aging performance of asphalt.
[0010] Preferably, the hydrated silica is hydrophobically modified by a coupling agent.
[0011] By adopting the above technical solution, the hydrophobic modification of hydrated silicon dioxide can enhance the strength and waterproof effect of the flexible reinforcement layer.
[0012] Preferably, the reinforcing filler is at least one of nano zinc oxide, nano montmorillonite and conductive fiber.
[0013] By adopting the above technical solution, nano zinc oxide can be filled into the tiny pores in the flexible reinforcement layer to form a dense waterproof barrier and improve the waterproof performance of the waterproof bonding layer. The layered structure of nano montmorillonite can form a composite structure with the asphalt matrix material through intercalation, further improving the waterproofness and durability of the waterproof bonding layer. The addition of nano zinc oxide and nano montmorillonite can improve the adhesion of the interlayer interface, improve the bonding strength between the flexible reinforcement layer and the base bonding layer and the reinforced bonding layer, and use the high specific surface area and good dispersibility of nano materials to help form a tighter interface, reduce the phenomenon of interlayer peeling, and improve the durability of the waterproof bonding layer structure.
[0014] Conductive fibers can form a tiny conductive network in the flexible reinforcement layer. When microcracks appear in the waterproof bonding layer, the conductive fibers can activate the chemical reaction in the waterproof bonding layer structural system by generating microcurrents, accelerate ion migration at the cracks, and promote self-healing of the waterproof bonding layer material.
[0015] Preferably, the conductive fibers include at least one of carbon fibers and carbon nanotubes.
[0016] By adopting the above technical solution, carbon fibers and carbon nanotubes can give the waterproof bonding layer structure better self-healing ability, while forming a three-dimensional network structure in the flexible reinforcement layer system to absorb and disperse external loads, reduce stress concentration inside the waterproof bonding layer, and reduce the generation and expansion of cracks.
[0017] Preferably, the base bonding layer comprises the following raw materials in parts by weight: 60-80 parts of epoxy resin modified styrene acrylic emulsion and 50-70 parts of emulsified asphalt.
[0018] By adopting the above technical scheme, the epoxy resin modified styrene acrylic emulsion has good film-forming property and chemical stability, and can form a dense waterproof film on the surface of the concrete bridge deck substrate, effectively preventing water penetration and improving the waterproof performance of the waterproof bonding layer. The combination of epoxy resin modified styrene acrylic emulsion and emulsified asphalt can significantly improve the bonding strength between the base bonding layer and the concrete bridge deck. The cross-linked structure of epoxy resin and the viscosity of emulsified asphalt work together to form a strong bonding interface, ensure the close fit between the waterproof bonding layer and the bridge deck, and improve the durability and stability of the waterproof bonding layer structure.
[0019] Preferably, the enhanced bonding layer comprises component A and component B, wherein component A comprises the following raw materials in parts by weight: 60-80 parts of polyether polyol, 3-5 parts of chain extender, 0.5-0.8 parts of catalyst, and 0.5-3 parts of photobase generator, and component B comprises the following raw materials in parts by weight: 50-70 parts of isocyanate and 0.5-1 parts of photosensitizer.
[0020] By adopting the above technical solution and using two-component polyurethane, a reinforced bonding layer with high bonding strength can be formed on the surface of the flexible reinforcement layer, and the roving machine asphalt paving material can firmly adhere to the surface of the waterproof bonding layer, thereby improving the bonding strength of the waterproof bonding layer structure. The addition of a photobase generator and a photosensitizer can improve the weather resistance and anti-aging properties of the material. At the same time, the photobase generator can generate a base under light, catalyze the reaction of isocyanate and polyol, and enhance the initial bonding strength of the bonding layer, which can accelerate the curing of the reinforced bonding layer under light conditions, thereby improving the bonding strength and curing efficiency of the reinforced bonding layer.
[0021] In a second aspect, the present application provides a construction method for an independent waterproof bonding layer structure of a concrete bridge deck, which adopts the following technical solution: A construction method for an independent waterproof bonding layer structure of a concrete bridge deck comprises the following specific steps: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance and stirred evenly to form a flexible reinforcement layer mixture; First, the concrete bridge deck is cleaned, and then a base bonding layer is coated on the surface of the cleaned bridge deck. The flexible reinforcement layer mixture is then laid on the surface of the base bonding layer to form a flexible reinforcement layer. Then, a reinforced bonding layer is coated on the surface of the flexible reinforcement layer to complete the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
[0022] By adopting the above technical solution, the three-layer independent waterproof bonding layer structure can significantly improve the overall stability and durability of the waterproof bonding layer, greatly simplify the construction process, reduce manual labor and the need for mechanical equipment, thereby reducing the overall cost.
[0023] Preferably, the construction method of the independent waterproof bonding layer structure of the concrete bridge deck comprises the following specific steps: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance and stirred evenly to form a flexible reinforcement layer mixture; The epoxy resin modified styrene acrylic emulsion is mixed with emulsified asphalt to form a base bonding layer mixture, the polyether polyol, chain extender, catalyst and photobase generator are mixed, and then isocyanate and photosensitizer are added and mixed to form a reinforced bonding layer mixture; First, the concrete bridge deck is cleaned, and then a layer of base bonding layer mixture is coated on the surface of the cleaned bridge deck to form a base bonding layer. The flexible reinforcement layer mixture is then laid on the surface of the base bonding layer to form a flexible reinforcement layer. A layer of reinforcement bonding layer mixture is then coated on the surface of the flexible reinforcement layer to form a reinforcement bonding layer, thereby completing the construction of an independent waterproof bonding layer structure for the concrete bridge deck.
[0024] Preferably, the base bonding layer has a thickness of 1-3 mm, the flexible reinforcement layer has an average thickness of 4-6 mm, and the enhanced bonding layer has a thickness of 1-3 mm.
[0025] In summary, this application has the following beneficial effects: 1. Since the present application lays a flexible reinforcement layer between the base bonding layer and the enhanced bonding layer, the base bonding layer is directly bonded to the surface of the road base. Through the two-layer bonding layer structure, the bonding between the asphalt mixture and the road surface can be strengthened, and the stability and durability of the waterproof bonding layer structure and the bridge deck asphalt pavement structure can be improved. Through the synergistic effect of the various components in the flexible reinforcement layer raw material, a dense waterproof layer is formed, the waterproof effect and flexibility of the waterproof bonding layer structure are improved, and the brittle cracking phenomenon of the asphalt bonding layer is reduced.
[0026] 2. The use of carbon fiber and carbon nanotubes as conductive fibers in this application can improve the self-healing ability of the waterproof adhesive layer and reduce the generation and expansion of cracks. At the same time, the high specific surface area and good dispersibility of nano zinc oxide and nano montmorillonite are utilized to improve the bonding strength between the flexible reinforcement layer and the base adhesive layer and the enhanced adhesive layer, reduce the phenomenon of interlayer peeling, and improve the durability of the waterproof adhesive layer structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is the independent waterproof bonding layer structure of the concrete bridge deck in Example 1 of the present application.
[0028] Explanation of the accompanying drawings: 1. Base bonding layer; 2. Flexible reinforcement layer; 3. Enhanced bonding layer. DETAILED DESCRIPTION
[0029] The present application is further described in detail below with reference to the embodiments.
[0030] All raw materials in the examples are commercially available.
[0031] The hydrogenated styrene-butadiene block copolymer was purchased from Sinopec Baling Petrochemical YH-501.
[0032] The solid content of epoxy resin modified styrene acrylic emulsion is wield 43%, the viscosity is 960mPa.s and the pH value is 8.65.
[0033] The model of emulsified asphalt is RHLW1-2.
[0034] The styrene-butadiene rubber is purchased from Huaxin’s innovative waterproof material HC-W086.
[0035] The terpene resin was purchased from Foshan Baolin Chemical Industry Co., Ltd. as terpene resin BT-911. Example
[0036] Example 1 The present embodiment provides an independent waterproof bonding layer structure for a concrete bridge deck, which comprises a base bonding layer, a flexible reinforcement layer and an enhanced bonding layer from bottom to top. The base bonding layer comprises the following raw materials in parts by weight: 70 kg of epoxy resin modified styrene acrylic emulsion and 60 kg of emulsified asphalt.
[0037] The enhanced bonding layer includes component A and component B. Component A includes the following raw materials in parts by weight: 70 kg of polyether polyol, 4 kg of chain extender, and 0.7 kg of catalyst. Component B is 60 kg of isocyanate. The polyether polyol is polyester polyol XCPA-245-3, the chain extender is trimethylolpropane, the catalyst is an organic tin catalyst stannous octoate, and the isocyanate is 4,4'-diphenylmethane diisocyanate.
[0038] The flexible reinforcement layer includes the following raw materials in parts by weight: 55 kg of asphalt, 35 kg of styrene-butadiene rubber, 25 kg of hydrogenated styrene-butadiene block copolymer, 15 kg of hydrated silica, 8 kg of tackifier, 8 kg of coupling agent, and 15 kg of reinforcing filler, wherein the tackifier is terpene resin, the coupling agent is silane coupling agent A-151, and the reinforcing filler is zinc oxide.
[0039] The construction method of the independent waterproof bonding layer structure of the concrete bridge deck includes the following specific steps: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance, and stirred evenly at 170° C. to form a flexible reinforcement layer mixture; The epoxy resin modified styrene acrylic emulsion and the emulsified asphalt were mixed, and stirred at 4000 rpm for 20 minutes to form a base bonding layer mixture; Dehydrate the polyether polyol, mix it with a chain extender and a catalyst, add isocyanate and mix at 40°C to form a reinforced bonding layer mixture; refer to Figure 1 First, clean the concrete bridge deck, then apply a layer of base bonding layer mixture on the cleaned bridge deck surface to form a base bonding layer 1 with an average thickness of 2 mm, then lay the flexible reinforcement layer mixture on the surface of the base bonding layer 1 to form a flexible reinforcement layer 2 with an average thickness of 5 mm, and then apply a layer of reinforcement bonding layer mixture on the surface of the flexible reinforcement layer 2 to form a reinforcement bonding layer 3 with an average thickness of 2 mm, thus completing the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
[0040] Example 2 The difference between Example 2 and Example 1 is that the amount of asphalt used in the raw material of the flexible reinforcement layer is 50 kg, the amount of styrene-butadiene rubber used is 40 kg, the amount of hydrogenated styrene-butadiene block copolymer used is 20 kg, the amount of hydrated silica used is 10 kg, the amount of tackifier used is 5 kg, the amount of coupling agent used is 10 kg, and the amount of reinforcing filler used is 10 kg.
[0041] Example 3 The difference between Example 3 and Example 1 is that the amount of asphalt used in the raw material of the flexible reinforcement layer is 60 kg, the amount of styrene-butadiene rubber used is 30 kg, the amount of hydrogenated styrene-butadiene block copolymer used is 30 kg, the amount of hydrated silica used is 20 kg, the amount of tackifier used is 10 kg, the amount of coupling agent used is 5 kg, and the amount of reinforcing filler used is 20 kg.
[0042] Example 4 The difference between Example 4 and Example 1 is that the hydrated silicon dioxide is hydrophobically modified by a coupling agent.
[0043] The construction method of the independent waterproof bonding layer structure of the concrete bridge deck includes the following specific steps: The pre-hydrated silica was baked at 400°C for 10 minutes, and a coupling agent was added while stirring at a speed of 200 r / min and continued to stir for 20 minutes. After drying, modified hydrated silica was obtained. Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, tackifier, modified hydrated silica and reinforcing filler were mixed and stirred evenly at 170°C to form a flexible reinforcement layer mixture. The epoxy resin-modified styrene-acrylic emulsion was mixed with the emulsified asphalt, and stirred and mixed at 4000 rpm for 20 minutes to form a base bonding layer mixture. Dehydrate the polyether polyol, mix it with a chain extender and a catalyst, add isocyanate and mix at 40°C to form a reinforced bonding layer mixture; First, clean the concrete bridge deck, and then apply a layer of base bonding layer mixture on the cleaned bridge deck surface to form a base bonding layer with an average thickness of 2 mm, then lay the flexible reinforcement layer mixture on the surface of the base bonding layer to form a flexible reinforcement layer with an average thickness of 5 mm, and then apply a layer of reinforcement bonding layer mixture on the surface of the flexible reinforcement layer to form a reinforcement bonding layer with an average thickness of 2 mm, thus completing the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
[0044] Example 5 The difference between Example 5 and Example 4 is that the raw material of the flexible reinforcement layer is a mixture of reinforcing filler nano-montmorillonite and conductive fiber, and the mass ratio of nano-montmorillonite to conductive fiber is 1:1. The conductive fiber is carbon fiber.
[0045] Example 6 The difference between Example 6 and Example 5 is that the amount of epoxy resin modified styrene acrylic emulsion used in the raw materials of the base bonding layer is 60 kg, and the amount of emulsified asphalt used is 50 kg.
[0046] Example 7 The difference between Example 7 and Example 5 is that the amount of epoxy resin modified styrene acrylic emulsion used in the raw materials of the base bonding layer is 80 kg, and the amount of emulsified asphalt used is 50 kg.
[0047] Example 8 The difference between Example 8 and Example 5 is that the enhanced bonding layer includes component A and component B, component A includes the following raw materials in parts by weight: 70 kg of polyether polyol, 4 kg of chain extender, 0.7 kg of catalyst, and 1.2 kg of photobase generator, and component B includes the following raw materials in parts by weight: 60 kg of isocyanate and 0.8 kg of photosensitizer, wherein the photobase generator is WPBG-266 and the photosensitizer is 4-isopropylthioxanthone.
[0048] The construction method of the independent waterproof bonding layer structure of the concrete bridge deck includes the following specific steps: The pre-hydrated silica was baked at 400°C for 10 minutes, and a coupling agent was added while stirring at a speed of 200 r / min and continued to stir for 20 minutes. After drying, modified hydrated silica was obtained. Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, tackifier, modified hydrated silica and reinforcing filler were mixed and stirred evenly at 170°C to form a flexible reinforcement layer mixture. The epoxy resin-modified styrene-acrylic emulsion was mixed with the emulsified asphalt, and stirred and mixed at 4000 rpm for 20 minutes to form a base bonding layer mixture. The polyether polyol, chain extender, catalyst and photobase generator are mixed, heated to 110°C for dehydration for 2 hours, photosensitizer is added and then cooled to 80°C, isocyanate is added and mixed for reaction for 2 hours to form a reinforced bonding layer mixture; First, clean the concrete bridge deck, and then apply a layer of base bonding layer mixture on the cleaned bridge deck surface to form a base bonding layer with an average thickness of 2 mm, then lay the flexible reinforcement layer mixture on the surface of the base bonding layer to form a flexible reinforcement layer with an average thickness of 5 mm, and then apply a layer of reinforcement bonding layer mixture on the surface of the flexible reinforcement layer to form a reinforcement bonding layer with an average thickness of 2 mm, thus completing the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
[0049] Example 9 The difference between Example 9 and Example 8 is that the amount of polyether polyol used in the raw materials of the reinforced bonding layer component A package is 60 kg, the amount of chain extender used is 3 kg, the amount of catalyst used is 0.5 kg, the amount of photobase generator used is 0.5 kg, the amount of isocyanate used in the raw materials of component B is 50 kg, and the amount of photosensitizer used is 0.5 kg.
[0050] Example 10 The difference between Example 10 and Example 8 is that the amount of polyether polyol used in the raw materials of the reinforced bonding layer component A package is 80 kg, the amount of chain extender used is 5 kg, the amount of catalyst used is 0.8 kg, the amount of photobase generator used is 3 kg, the amount of isocyanate used in the raw materials of component B is 70 kg, and the amount of photosensitizer used is 1 kg.
[0051] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the independent waterproof bonding layer structure of the concrete bridge deck does not use a base bonding layer.
[0052] The construction method of the independent waterproof bonding layer structure of the concrete bridge deck includes the following specific steps: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance, and stirred evenly at 170° C. to form a flexible reinforcement layer mixture; Dehydrate the polyether polyol, mix it with a chain extender and a catalyst, add isocyanate and mix at 40°C to form a reinforced bonding layer mixture; First, clean the concrete bridge deck, then lay the flexible reinforcement layer mixture on the cleaned bridge deck surface to form a flexible reinforcement layer with an average thickness of 5 mm, and then coat a layer of enhanced bonding layer mixture on the surface of the flexible reinforcement layer to form an enhanced bonding layer with an average thickness of 2 mm, thus completing the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
[0053] Performance testing According to the independent waterproof bonding layer structure of the concrete bridge deck provided in Examples 1-10 of the present application and Comparative Example 1, the following performance tests were performed, and the specific test results are shown in Table 1.
[0054] Detection Methods 1. Water seepage test With reference to the standard T0971-2019 in JTG3450-2019 "Field Test Procedure for Highway Roadbed and Pavement", the waterproof performance test of the independent waterproof bonding layer structure of the concrete bridge deck prepared in this application was tested.
[0055] 2. Adhesion performance With reference to the 2016 "Technical Guidelines for Design and Construction of Highway Steel Box Girder Bridge Deck Pavement", the bonding performance of the independent waterproof bonding layer structure of the concrete bridge deck prepared in this application was tested.
[0056] 3. Low temperature flexibility With reference to the standard of JC / T 408-2005 "Water-emulsified asphalt waterproof coating", the flexibility of the independent waterproof bonding layer structure of the concrete bridge deck prepared in this application was tested at -15°C.
[0057] Table 1: Performance test results data table It can be seen from the performance test results that the independent waterproof bonding layer structure of the concrete bridge deck prepared in this application has good waterproof performance and bonding strength through the synergistic effect of the base bonding layer, the flexible reinforcement layer and the enhanced bonding layer. At the same time, a flexible reinforcement layer is laid between the base bonding layer and the enhanced bonding layer, which can absorb the pressure of the vehicle load, reduce the shear displacement deformation of the waterproof bonding layer structure, and reduce the cracking phenomenon. By comparing Comparative Example 1 with Example 1, it can be seen that by reducing the use of the base bonding layer, it can be seen from the performance test results that the bonding strength and waterproof performance of the waterproof bonding layer finally formed will be reduced, and the adhesion between the waterproof bonding layer and the road surface will also be reduced, and then the shear displacement deformation phenomenon of the waterproof bonding layer structure is prone to occur, and cracking problems will occur. It can be seen from Examples 8-10 that by adding a photobase generator and a photosensitizer, the bonding strength and curing efficiency of the enhanced bonding layer are improved, and the bonding strength of the waterproof bonding layer structure is enhanced.
[0058] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
Claims
1. A concrete bridge deck independent waterproof bonding layer structure, characterized in that: It includes a base bonding layer, a flexible reinforcement layer and an enhanced bonding layer, wherein the flexible reinforcement layer is located between the base bonding layer and the enhanced bonding layer, and the flexible reinforcement layer includes the following raw materials in parts by weight: 50-60 parts of asphalt, 30-40 parts of styrene-butadiene rubber, 20-30 parts of hydrogenated styrene-butadiene block copolymer, 10-20 parts of hydrated silica, 5-10 parts of tackifier, 5-10 parts of coupling agent, and 10-20 parts of reinforcing filler.
2. The concrete bridge deck independent waterproof bonding layer structure according to claim 1, characterized in that: The hydrated silica is hydrophobically modified by a coupling agent.
3. The concrete bridge deck independent waterproof bonding layer structure according to claim 1, characterized in that: The reinforcing filler is at least one of nano zinc oxide, nano montmorillonite and conductive fiber.
4. The concrete bridge deck independent waterproof bonding layer structure according to claim 3 is characterized in that: The conductive fibers include at least one of carbon fibers and carbon nanotubes.
5. The concrete bridge deck independent waterproof bonding layer structure according to claim 1, characterized in that: The base bonding layer comprises the following raw materials in parts by weight: 60-80 parts of epoxy resin modified styrene acrylic emulsion and 50-70 parts of emulsified asphalt.
6. The independent waterproof bonding layer structure of concrete bridge deck according to claim 1, characterized in that: The enhanced bonding layer comprises component A and component B, wherein component A comprises the following raw materials in parts by weight: 60-80 parts of polyether polyol, 3-5 parts of chain extender, 0.5-0.8 parts of catalyst, and 0.5-3 parts of photobase generator, and component B comprises the following raw materials in parts by weight: 50-70 parts of isocyanate and 0.5-1 parts of photosensitizer.
7. A construction method for an independent waterproof bonding layer structure for a concrete bridge deck as claimed in any one of claims 1 to 6, characterized in that: The specific steps include: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance and stirred evenly to form a flexible reinforcement layer mixture; First, the concrete bridge deck is cleaned, and then a base bonding layer is coated on the surface of the cleaned bridge deck. The flexible reinforcement layer mixture is then laid on the surface of the base bonding layer to form a flexible reinforcement layer. Then, a reinforced bonding layer is coated on the surface of the flexible reinforcement layer to complete the construction of the independent waterproof bonding layer structure of the concrete bridge deck.
8. The construction method of the independent waterproof bonding layer structure of a concrete bridge deck according to claim 7, characterized in that: The specific steps include: Asphalt, styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer, hydrated silica, tackifier, coupling agent and reinforcing filler are mixed in advance and stirred evenly to form a flexible reinforcement layer mixture; The epoxy resin modified styrene acrylic emulsion is mixed with emulsified asphalt to form a base bonding layer mixture, the polyether polyol, chain extender, catalyst and photobase generator are mixed, and then isocyanate and photosensitizer are added and mixed to form a reinforced bonding layer mixture; First, the concrete bridge deck is cleaned, and then a layer of base bonding layer mixture is coated on the surface of the cleaned bridge deck to form a base bonding layer. The flexible reinforcement layer mixture is then laid on the surface of the base bonding layer to form a flexible reinforcement layer. A layer of reinforcement bonding layer mixture is then coated on the surface of the flexible reinforcement layer to form a reinforcement bonding layer, thereby completing the construction of an independent waterproof bonding layer structure for the concrete bridge deck.
9. The construction method of the independent waterproof bonding layer structure of a concrete bridge deck according to claim 8, characterized in that: The thickness of the base bonding layer is 1-3 mm, the average thickness of the flexible reinforcement layer is 4-6 mm, and the thickness of the enhanced bonding layer is 1-3 mm.