Concrete bridge anti-crack bridge deck pavement structure and pavement method

Abstract

The invention relates to the technical field of bridge pavement, in particular to a concrete bridge anti-crack bridge deck pavement structure and a pavement method. A high-elasticity modified asphalt mastic macadam concrete upper surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a fiber high-strength dense water asphalt concrete lower surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a high-toughness asphalt sand stress absorbing layer, a fiber waterborne epoxy anti-cracking waterproof bonding layer and a C50 fiber concrete anti-freezing and anti-cracking layer are sequentially arranged from top to bottom. The durability of the bridge deck pavement structure is improved, and the problem that the service life of the bridge deck pavement structure is short is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pavement, and in particular to a crack-resistant bridge deck pavement structure and a paving method for a concrete bridge. Background Art

[0002] With the rapid development of transportation infrastructure construction, concrete bridges, as important transportation hubs, the durability and crack resistance of their bridge deck pavement structures are directly related to the service life of the bridges and driving safety.

[0003] However, the following problems are common in the practical application of traditional bridge deck pavement structures: (1) Prominent crack problems: Under the influence of vehicle loads, temperature changes and environmental factors (such as humidity and freeze-thaw cycles), the bridge deck pavement layer is prone to reflection cracks, temperature cracks and fatigue cracks. These cracks not only affect driving comfort, but also accelerate the intrusion of moisture and corrosive media, leading to secondary diseases such as pavement peeling and steel corrosion, seriously reducing the service life of the bridge structure; (2) Insufficient interlayer bonding performance: The bonding layer and waterproof bonding layer of traditional bridge deck pavement structures have poor bonding performance. Under the influence of long-term loads and temperature stress, problems such as interlayer delamination and slippage are prone to occur, further aggravating the cracking and damage of the pavement layer; (3) Material performance limitations: Traditional pavement materials (such as ordinary asphalt concrete) have low tensile strength and poor toughness, making it difficult to effectively resist the initiation and expansion of cracks. At the same time, their insufficient water-tightness can easily lead to water infiltration, causing bridge deck corrosion and structural performance degradation.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The first object of the present invention is to provide a crack-resistant bridge deck pavement structure for a concrete bridge, thereby improving the durability of the bridge deck pavement structure and solving the problem of insufficient service life of the bridge deck pavement structure.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a concrete bridge anti-cracking bridge deck pavement structure, which comprises, from top to bottom, a high-elasticity modified asphalt mastic crushed stone concrete upper layer, a fiber non-stick wheel emulsified asphalt bonding layer, a fiber high-strength water-tight asphalt concrete lower layer, a fiber non-stick wheel emulsified asphalt bonding layer, a high-toughness asphalt sand stress absorption layer, a fiber water-based epoxy anti-cracking and waterproof bonding layer, and a C50 fiber concrete anti-freeze and anti-cracking layer;

[0007] The present invention adopts a paving structure system of "C50 fiber concrete anti-freeze and anti-cracking layer + high-toughness asphalt sand stress absorption layer + fiber high-strength water-tight asphalt concrete lower layer + high-elastic modified asphalt mastic crushed stone concrete upper layer". Through the gradient design of rigid anti-cracking matrix-flexible stress buffer-water-tight load-bearing middle layer-high-elastic damage-resistant surface layer, multi-level crack suppression is achieved, and the progressive modulus distribution from rigidity to flexibility from the base layer to the surface layer. This distribution enables the stress to be eliminated step by step when subjected to external effects, and the energy of crack expansion is gradually absorbed, thereby achieving multi-level crack suppression and forming a multi-layer waterproof barrier to achieve full-section waterproofing.

[0008] As a preferred embodiment of the present invention, the thickness of the top layer of highly elastic modified asphalt mastic crushed stone concrete is 4-5 cm. The 4-5 cm thick top layer uses a highly elastic modified asphalt and mastic crushed stone structure, which combines high elasticity with high wear resistance. This thickness creates a "soft on top, hard on bottom" gradient between the modulus of the surface layer and the underlying layer, gradually dissipating load stress and avoiding bottom cracking. At the same time, it controls the risk of high-temperature rutting, ensures driving comfort and surface durability, and is a damage-resistant protective layer that directly bears external loads.

[0009] The thickness of the fiber high-strength water-tight asphalt concrete lower layer is 4-8cm. This thickness ensures that this layer has both high-strength load-bearing and water-tight functions: the high-strength material bears the main stress of vehicle loads, and the water-tight structure prevents water from seeping into the base layer. Within this thickness range, the asphalt concrete meets the density and rutting resistance standards, avoiding fatigue cracking due to excessive thinness and increasing construction costs due to excessive thickness, becoming the core waterproof and load-bearing layer that connects the upper and lower layers.

[0010] The thickness of the emulsified asphalt bonding layer of the fiber non-stick wheel is 0.4-0.7mm. The 0.4-0.7mm thin coating is penetrated by the emulsified asphalt and reinforced by the fiber, providing uniform interlayer bonding, ensuring the coordinated force of the upper and lower structures and avoiding push-over diseases. It is a key thin layer for interlayer connection and construction adaptation.

[0011] The thickness of the high-toughness asphalt sand stress absorption layer is 2-4 cm. This 2-4 cm thick high-toughness asphalt sand stress absorption layer acts as a flexible buffer zone, using high-toughness materials to absorb the stress of crack expansion in the base layer, dissipating energy through plastic deformation, and preventing the cracks from reflecting upward. This thickness ensures sufficient stress absorption space while avoiding interlayer slippage caused by excessive thickness, achieving a modulus transition between the rigid base layer and the asphalt surface layer and reducing stress concentration.

[0012] The thickness of the fiber water-based epoxy anti-cracking waterproof bonding layer is 0.8-1.2mm. The thin coating of 0.8-1.2mm penetrates the pores of the concrete base through the water-based epoxy resin to form a high-strength bonding interface, preventing interlayer peeling and sealing the micro-cracks of the base to become a waterproof barrier. The moderate thickness can take into account the coordination of bonding strength and deformation, avoiding excessive thin coating and increased brittleness, and effectively connecting the rigid base with the upper flexible structure;

[0013] The thickness of the C50 fiber concrete anti-freeze and anti-cracking layer is 8-10cm. The 8-10cm thickness provides a rigid support foundation for the bridge deck. It can not only withstand long-term loads and freeze-thaw cycles, but also enhance the toughness of concrete through fibers, inhibiting the initiation of cracks such as shrinkage and frost heave. Within this thickness range, the concrete strength (C50) and anti-freeze performance are balanced, avoiding insufficient rigidity due to being too thin or increased deadweight due to being too thick, ensuring the long-term stability of the base layer and reducing the hidden dangers of cracks from the bottom.

[0014] As a preferred embodiment of the present invention, the C50 fiber concrete antifreeze and anti-cracking layer is composed of cement, aggregate, mineral admixture, fiber, admixture and water, and the mass ratio thereof is 10-15:60-70:5-10:0.5-2:0.5-2:4-8.

[0015] As a preferred embodiment of the present invention, the cement is ordinary Portland cement or sulphoaluminate cement. Ordinary Portland cement has stable hydration products, good late strength growth characteristics and economy, and is suitable for long-term load-bearing structures. Sulphoaluminate cement has fast early strength development, low hydration heat, and excellent frost resistance and corrosion resistance, and is particularly suitable for cold regions or freeze-thaw environments.

[0016] Aggregates include coarse aggregate and fine aggregate. Coarse aggregate is crushed stone with a particle size of 5-20mm and a crushing value of ≤20%. Medium-sized crushed stone forms a skeleton structure, which can not only ensure the compressive strength and frost resistance of concrete, but also avoid the problem of weak interfacial bonding caused by excessive particle size. A crushing value of ≤20% indicates high aggregate strength, which can effectively resist stress damage during load and freeze-thaw cycles and reduce crack initiation. Fine aggregate is natural sand or machine-made sand with a particle size of 0.15-5mm, a fineness modulus of 2.3-3.0, and a mud content of ≤3%. The moderate fineness modulus ensures a reasonable mortar gradation and forms a dense skeleton with the coarse aggregate, improving the workability and bonding of the concrete. A mud content of ≤3% can reduce the interference of mud on cement hydration, avoid increased porosity and decreased strength, and enhance impermeability and crack resistance.

[0017] The mineral admixture is one or more of fly ash, slag powder or silica fume, wherein the specific surface area of fly ash is 400-600m 2 / kg, the medium specific surface area enables fly ash to have both "ball effect" and pozzolanic activity, reducing cement consumption and lowering hydration heat. In the later stage, secondary hydration fills pores, improving impermeability and resistance to freeze-thaw cycles;

[0018] The specific surface area of slag powder is 400-500m 2 / kg. The specific surface area within this range enables slag powder to have a good micro-aggregate filling effect, effectively improving the workability of concrete mixtures, reducing porosity, and enhancing durability such as frost resistance and impermeability.

[0019] The specific surface area of silica fume is 15000-20000m 2 / kg, its ultra-high specific surface area fills nano-scale pores, significantly improving concrete density and blocking the penetration path of moisture and harmful substances. Its active ingredients quickly participate in hydration, significantly enhancing early strength and crack resistance. Especially in freeze-thaw environments, the dense structure can reduce frost heave damage caused by moisture intrusion;

[0020] The fibers are one or more of polypropylene fibers, steel fibers, glass fibers, or basalt fibers. The polypropylene fibers are 6-20 mm in length and 10-50 μm in diameter. The steel fibers are 20-60 mm in length and 0.3-1.2 mm in diameter. The glass fibers or basalt fibers are 6-20 mm in length and 10-20 μm in diameter. Polypropylene fibers inhibit early plastic shrinkage cracks and reduce the initiation of microcracks. Their low elastic modulus provides flexible constraints during freeze-thaw deformation, avoiding stress concentration. Steel fibers significantly improve the toughness and crack resistance of concrete, bridging cracks under load or frost heave stress, preventing crack propagation and enhancing impact and fatigue resistance. Glass fibers and basalt fibers are resistant to high temperatures and corrosion, bond well with the cement matrix, improve brittleness, and assist in controlling crack development, making them particularly suitable for long-term durability requirements in complex environments.

[0021] The admixture is one or more of a water reducer, an air entraining agent or an antifreeze agent, the water reducer is a polycarboxylic acid-based water reducer, the air entraining agent is a rosin-based air entraining agent, and the antifreeze agent is a nitrite-based antifreeze agent;

[0022] The pH value of the water is 6-8, and the chloride ion content is ≤200mg / L;

[0023] The C50 fiber concrete antifreeze and anti-cracking layer composed of the above materials forms a three-dimensional optimization system of "skeleton support-dense matrix-fiber crack resistance-admixture regulation" through multi-component collaboration: coarse and fine aggregates construct a high-strength graded skeleton, and mineral admixtures with different specific surface areas realize pore filling and secondary hydration from macro to nano scale, improving density and impermeability; fibers form a full-cycle anti-cracking network of "microcrack inhibition-crack expansion blocking"; polycarboxylic acid water reducer, rosin air entraining agent, nitrite antifreeze agent and cementitious material are coupled to reduce the water-cement ratio, introduce antifreeze buffer bubbles and ensure negative temperature hydration, and cooperate with clean water source to control alkali aggregate reaction and steel corrosion; the concrete's anti-freeze and thaw cycle ability, crack resistance and long-term durability are significantly improved.

[0024] As a preferred embodiment of the present invention, the fiber water-based epoxy anti-cracking and waterproof bonding layer is composed of a water-based epoxy resin main agent, a curing agent, fiber, a filler and an additive, and the mass ratio thereof is 60-65:10-15:1-5:20-25:1-5;

[0025] The epoxy equivalent weight of the waterborne epoxy resin main agent is 200-500g / eq. The above epoxy equivalent weight ensures that the resin molecular chain length is moderate, which not only ensures sufficient cross-linking reaction activity, but also avoids insufficient flexibility or increased application viscosity due to excessive molecular weight;

[0026] The curing agent is an amine curing agent or a polyamide curing agent with an amine value of 150-400 mgKOH / g. The amine value and epoxy equivalent work synergistically. The amine / polyamide curing agent with a value of 150-400 mgKOH / g ensures sufficient cross-linking with the epoxy resin, avoiding an amine value that is too low (incomplete reaction, soft coating) or too high (too fast reaction, internal stress concentration, easy cracking).

[0027] The fibers are glass fibers with a length of 3-12 mm and a diameter of 10-20 μm. The 3-12 mm length and 10-20 μm diameter form a dual role of "bridging and dispersion". Short fibers (3-6 mm) are evenly dispersed in the resin matrix to inhibit the initiation of microcracks; long fibers (6-12 mm) span macrocracks, bear tensile stress, and prevent crack expansion.

[0028] The filler is one or more of calcium carbonate, talc, silica powder or quartz powder, with a particle size of 200-800 mesh and an oil absorption value of 20-50g / 100g. The 200-800 mesh filler (medium-fine particle size) fills the pores of the resin matrix and improves the density of the coating. At the same time, the 20-50g / 100g oil absorption value avoids excessive consumption of resin and ensures a balance between mechanical properties and construction workability.

[0029] The additives include one or more dispersants and thickeners. The dispersant is a polycarboxylate dispersant, which ensures the uniform dispersion of glass fiber and filler in the aqueous system through electrostatic repulsion and steric hindrance effects, avoids performance defects caused by agglomeration, and improves the homogeneity of the material.

[0030] The thickener is a cellulose ether thickener or a polyurethane thickener. It adjusts the viscosity of the system to the appropriate construction range to ensure uniform coating thickness. At the same time, the water retention effect of the thickener delays water evaporation, promotes the full curing of the epoxy resin, and avoids shrinkage and cracking of the coating film caused by excessive drying.

[0031] The fiber water-based epoxy anti-cracking waterproof bonding layer of the present invention achieves a balance between high strength and flexibility through the precise ratio of the water-based epoxy resin main agent and the curing agent. The multi-scale bridging of the glass fiber inhibits the initiation and expansion of cracks, and the medium and fine particle size fillers fill the pores to improve the density and waterproofness. The polycarboxylate dispersant ensures the uniform dispersion of the components, and the thickener optimizes the construction viscosity and coating uniformity, and together constructs a composite system of "dense continuous waterproof membrane + fiber reinforced skeleton", so that the coating has excellent crack resistance, high bonding strength, low water absorption rate and convenient construction, and achieves the dual effects of durable crack resistance and long-term waterproofing under heavy load and freeze-thaw environments such as bridges.

[0032] As a preferred embodiment of the present invention, the porosity of the high-toughness asphalt sand stress-absorbing layer is 8-12%. This porosity range enables the asphalt sand layer to form an elastic buffer structure. This structure can absorb the tensile and shear stresses caused by cracking of the base layer through pore deformation while maintaining sufficient density, thus balancing stress absorption capacity and water damage resistance.

[0033] It is composed of SBS modified asphalt, aggregate, mineral filler and toughening agent, with the mass ratio of 8-10:80-90:3-5:0.5-2;

[0034] Aggregate is any one or a mixture of crushed stone made from limestone, granite, basalt, machine-made sand, with a particle size of 0-4.75mm, which builds a tightly packed skeleton structure;

[0035] Mineral fillers are a mixture of one or more of limestone powder, cement, and mineral powder. Mineral fillers form a mortar complex with asphalt to enhance bonding strength and peeling resistance. They can also adjust the thickness of the asphalt film and improve low-temperature crack resistance when combined with toughening agents.

[0036] The toughening agent is rubber powder with a particle size of 0.075-2mm and an ash content of ≤8%. The rubber powder fills the asphalt microstructure, improving the elongation at break and forming "energy dissipation nodes" that absorb crack expansion energy through particle deformation.

[0037] The high-toughness asphalt sand stress-absorbing layer forms an elastic buffer structure with an 8-12% void ratio. It works in synergy with the tightly embedded skeleton constructed by SBS modified asphalt and aggregate, the mortar composite formed by mineral fillers and asphalt, and the rubber powder toughening system to achieve the multiple functions of "stress absorption - skeleton support - interface reinforcement - energy dissipation": the elastic pores effectively eliminate the tensile / shear stress generated by base cracking, avoiding reflective cracks; the aggregate skeleton provides deformation resistance rigidity, and the mineral fillers enhance the adhesion between asphalt and aggregate and optimize the asphalt film thickness, preventing water damage and aggregate shedding; the rubber powder particles are embedded in the asphalt matrix to form "energy dissipation nodes", which absorb crack expansion energy through elastic deformation and improve the elongation at fracture; the overall structure is both rigid and flexible, which can adapt to base deformation and withstand heavy loads, significantly reducing the risk of cracking of bridge deck pavement caused by temperature changes and vehicle loads. At the same time, the moderate density prevents water infiltration, and works together with the upper and lower layers to form a durable and crack-resistant waterproof system, extending the service life of the bridge pavement.

[0038] As a preferred embodiment of the present invention, the amount of emulsified asphalt bonding layer applied to the fiber non-stick wheel is 0.4-0.7 kg / m 2 The above-mentioned spreading amount not only forms a continuous bonding film by quickly breaking the emulsion of the fast-cracking emulsified asphalt, tightly connecting the upper and lower structural layers, but also avoids excessive amount causing wheel sticking, thus ensuring the continuity of the paving operation;

[0039] It is composed of emulsified asphalt, fiber, water and stabilizer, with a mass ratio of 65-70:0.5-3:25-30:1-2;

[0040] The emulsified asphalt is a fast-cracking cationic asphalt emulsified asphalt. After rapid demulsification, the fast-cracking cationic emulsified asphalt forms a continuous asphalt film at the interface between the upper and lower layers. Due to its cationic polarity, it closely adsorbs to substrates such as concrete and asphalt, achieving high-strength bonding between the layers. This ensures that the lower layer of high-toughness asphalt sand stress absorption layer and the upper layer of fiber-based high-strength water-dense asphalt concrete layer are synergistically stressed, preventing interlayer delamination and slippage under load.

[0041] The fibers are glass fibers with a length of 3-12 mm and a diameter of 10-20 μm. The glass fibers are evenly dispersed in the asphalt membrane to form a micro-reinforced network, effectively resisting shear stress and fatigue damage caused by vehicle loads and inhibiting crack initiation at the interlayer interface. The stabilizer is either polyvinyl alcohol or carboxymethyl cellulose. The stabilizer prevents fiber sedimentation and emulsified asphalt segregation by thickening and retaining water, and is used in conjunction with water to adjust the system viscosity.

[0042] The elastic deformation capacity of the fiber non-stick wheel emulsified asphalt bonding layer and the high-toughness asphalt sand stress absorption layer, and the rigid load-bearing characteristics of the fiber high-strength water-tight asphalt concrete lower layer form a "strong bonding-fatigue resistance-easy construction" structural complementarity, jointly constructing an inter-layer coordinated force system, significantly improving the overall crack resistance and construction convenience of the bridge deck pavement under heavy traffic and temperature changes, ensuring long-term coordinated service of each structural layer, and extending the service life of the pavement system.

[0043] As a preferred embodiment of the present invention, the lower layer of fiber high-strength water-tight asphalt concrete is composed of SBS modified asphalt, composite multi-effect reinforcing agent, limestone coarse aggregate, limestone fine aggregate, limestone mineral powder and fiber, and the mass ratio thereof is 3.5-4.5:0.8-1.2:60-65:30-35:4-6:0.2-0.5;

[0044] The composite multi-effect enhancer is prepared by compounding linear low-density polyethylene (LLDPE) with low-grade hard asphalt and nano-elastomer materials. LLDPE can improve the high-temperature stability of asphalt and enhance its anti-rutting ability. The low-grade hard asphalt increases the hardness and strength of the mixture. The nano-elastomer material improves the low-temperature ductility and reduces low-temperature cracking. The three work synergistically to significantly improve the high and low temperature performance and durability of asphalt concrete. Preferably, the mass ratio of linear low-density polyethylene (LLDPE), low-grade hard asphalt and nano-elastomer materials is 15-25:60-70:5-15.

[0045] A solubility of ≥98% ensures that LLDPE, low-grade hard asphalt, and nano-elastomer materials form a homogeneous system in the asphalt, avoiding performance defects caused by component separation. A similarity (infrared spectroscopy) of ≥98% indicates that the functional groups in the molecular structures of the three are highly matched (for example, the infrared absorption peaks of the polyethylene chains of LLDPE and the alkane chains of the asphalt matrix, and the styrene groups of the nano-elastomer and the aromatic components of the asphalt highly overlap), forming an interpenetrating network structure rather than a simple physical blend.

[0046] The fiber is basalt fiber with a length of 6-20mm and a diameter of 10-20μm. Basalt fiber has high strength and chemical stability, which can enhance the durability and impact resistance of asphalt concrete;

[0047] The void ratio of the fiber high-strength water-dense asphalt concrete layer is 1.5-2.5%. The lower void ratio makes the asphalt concrete more compact, reduces water infiltration, prevents water damage and freeze-thaw damage, and improves anti-skid performance and durability. The dynamic stability at 60°C is ≥10,000 times / mm, and the dynamic modulus at 15°C and 10Hz is 15,000MPa to 20,000MPa.

[0048] The lower layer of fiber high-strength water-dense asphalt concrete forms a high-strength and high-density structural system through the synergistic combination of SBS modified asphalt, composite multi-effect reinforcing agent, limestone aggregate, mineral powder and basalt fiber. Its ultra-low porosity of 1.5-2.5% effectively blocks water infiltration, and its dynamic stability at 60°C is ≥10,000 times / mm and its dynamic modulus at 15°C is 15,000-20,000 MPa, ensuring resistance to rutting at high temperatures and strong bearing capacity and fatigue resistance at room temperature. It cooperates with the high-toughness asphalt sand stress absorption layer, and its high modulus undertakes and disperses the vehicle load stress transmitted by the high-toughness asphalt sand stress absorption layer, making up for the low modulus of the stress absorption layer and avoiding interlayer cracking due to sudden changes in the modulus. It is tightly combined with the upper fiber non-stick wheel emulsified asphalt bonding layer, realizing effective force transmission through the bonding layer. At the same time, with its dense waterproof structure, it forms a waterproof barrier together with the fiber non-stick wheel emulsified asphalt bonding layer to prevent rainwater from penetrating into the lower structure and protect the entire pavement system.

[0049] As a preferred embodiment of the present invention, the top layer of the high-elasticity modified asphalt mastic macadam concrete is composed of high-elasticity modified asphalt, basalt coarse aggregate, basalt fine aggregate, mineral filler and lignin flocculent fiber, and the mass ratio thereof is 5-7:60-70:25-30:5-10:4-6:0.2-0.5;

[0050] Calculated by weight, high-elasticity modified asphalt includes 93-98 parts of SBS modified asphalt, 4-6 parts of scrap tire rubber powder, and 0.2-0.5 parts of polyethylene wax stabilizer. SBS modified asphalt can improve the high-temperature stability and low-temperature crack resistance of asphalt. The addition of scrap tire rubber powder further enhances the elasticity and toughness of asphalt, improves the fatigue resistance of the pavement, and realizes resource recycling. The polyethylene wax stabilizer helps improve the performance of asphalt, increasing its stability and uniformity, so that the high-elasticity modified asphalt can better perform its role.

[0051] In highly elastic modified asphalt, SBS modified asphalt and waste tire rubber powder are blended with polyethylene wax stabilizer to form a highly viscous and highly elastic asphalt-based binder. When the binder is mixed with mineral fillers, the fine particles of the mineral fillers fully absorb the asphalt, greatly improving the viscosity of the system. The lignin flocculent fibers are dispersed in it, like a three-dimensional reinforcement network, further enhancing the toughness and cohesion of the mortar. This mortar, which is interwoven with asphalt, mineral powder, fiber and fine aggregate, is the core form of mastic. Mastic is filled in the gaps in the skeleton formed by basalt coarse aggregate, tightly bonding all the gravel particles like super glue, giving the concrete overall high strength and high deformation resistance. At the same time, through its own high elasticity and dense structure, it improves the road surface's anti-skid, waterproof and fatigue resistance, and is the key to achieving excellent road performance of the upper layer.

[0052] The second object of the present invention is to provide a paving method for a crack-resistant bridge deck pavement structure of a concrete bridge, which is convenient for on-site construction and can ensure the uniformity of the bridge deck pavement structure.

[0053] The above technical objectives of the present invention are achieved through the following technical scheme: a C50 fiber concrete antifreeze and anti-cracking layer, a fiber water-based epoxy anti-cracking and waterproof bonding layer, a high-toughness asphalt sand stress absorption layer, a fiber non-stick wheel emulsified asphalt bonding layer, a fiber high-strength water-tight asphalt concrete lower layer, a fiber non-stick wheel emulsified asphalt bonding layer and a high-elasticity modified asphalt mastic crushed stone concrete upper layer are prepared in sequence on the box girder.

[0054] More specifically, the following steps are included:

[0055] S1. Prepare C50 fiber concrete according to the following steps: In the first stage, cement, aggregate, and mineral admixtures are weighed in proportion and added to a mixer and dry mixed for 20 to 30 seconds. In the second stage, water and admixtures are added in proportion and wet mixed for 60 seconds. In the third stage, during the mixing process, the fiber is evenly dispersed and added to the mixer, and wet mixed for another 60 to 90 seconds to prepare C50 fiber concrete;

[0056] S2. Cast C50 fiber concrete on the box girder. During the pouring process, the concrete was vibrated using a vibrator for 30-40 seconds. After pouring, the concrete surface was smoothed and maintained by watering, covering, and moisturizing. The curing time was not less than 7 days to obtain a C50 fiber concrete antifreeze and anti-cracking layer.

[0057] S3. Weigh the waterborne epoxy resin main agent, curing agent, filler and additives in proportion, add the waterborne epoxy resin main agent and curing agent in proportion to the stirrer and stir for 3-5min, the stirrer speed is 800-1000r / min, to prepare a waterborne epoxy resin base mixture, the filler and additives are sequentially added to the base mixture, stirred for 8-10min, and the fiber is added to the mixture, and stirring is continued for 10-15min using a high-speed stirrer (speed 1400-1600r / min) to prepare a waterborne epoxy fiber material;

[0058] S4 coated fiber waterborne epoxy material on the C50 fiber concrete antifreeze and cracking layer to obtain a fiber waterborne epoxy anti-cracking waterproof bonding layer, the coating thickness is 0.8 to 1.2 mm;

[0059] S5. Weigh SBS modified asphalt and toughening agent in proportion and heat them to a fluid state. The toughening agent is heated to 130-150°C and the SBS modified asphalt is heated to 160-170°C. The toughening agent heated to a fluid state is added to the SBS modified asphalt and sheared using a high-speed shearing machine. The shearing temperature is maintained at 185-195°C, the shearing speed is 4000 r / min, and the shearing time is not less than 25 minutes to prepare high-toughness SBS modified asphalt. Weigh aggregate and mineral filler in proportion and put them into a mixing tank. After stirring for 30-40 seconds, add the high-toughness SBS modified asphalt and continue stirring for 60-70 seconds to prepare a high-toughness asphalt sand material.

[0060] S6. Pour high-toughness asphalt sand on the fiber water-based epoxy anti-cracking waterproof bonding layer to a thickness of 2-4cm to obtain a high-toughness asphalt sand stress absorption layer;

[0061] S7. Weigh the emulsified asphalt, fiber, water and stabilizer in proportion, heat the emulsified asphalt to 120-150 ° C for standby, add the stabilizer to the water, stir at a speed of 600-1200 r / min for 3-10 minutes to form a homogeneous mixture, add the prepared emulsified asphalt to the mixture, and emulsify it at a speed of 2500-6000 r / min for 15-40 minutes through a high-speed shearing device to obtain a non-stick wheel emulsified asphalt matrix. Finally, add the fiber to the non-stick wheel emulsified asphalt matrix and continue stirring at a speed of 800-1500 r / min for 10-30 minutes to prepare a fiber non-stick wheel emulsified asphalt finished product;

[0062] S8. Applying fiber non-stick wheel emulsified asphalt on the high-toughness asphalt sand stress absorbing layer to a coating thickness of 0.4 to 0.7 mm to obtain a fiber non-stick wheel emulsified asphalt bonding layer;

[0063] S9. Weigh SBS modified asphalt, composite multi-effect reinforcing agent, limestone coarse aggregate, limestone fine aggregate, limestone slag and fiber in proportion, first add composite multi-effect reinforcing agent, limestone coarse aggregate, limestone fine aggregate and limestone slag into the preheated mixing tank, dry mix for 20-30 seconds, then pour the prepared SBS modified asphalt into the mixing tank and stir for 40-60 seconds, add fiber and continue stirring for 15-20 seconds to prepare fiber high-strength water-dense asphalt concrete;

[0064] The mass ratio of linear low-density polyethylene (LLDPE), low-grade hard asphalt, and nano-elastomer material is 15-25:60-70:5-15. The preparation method of the composite multi-effect enhancer is as follows: linear low-density polyethylene (LLDPE), low-grade hard asphalt, and nano-elastomer material are weighed in proportion, the low-grade hard asphalt is heated to 160-180° C. to melt and stir, the LLDPE is slowly added and thoroughly mixed, and then the mixture is transferred to a high-speed shearing device for shearing; the nano-elastomer material is then added and shearing is continued to uniformly disperse the components; finally, the sample solubility and similarity are tested, and the sample is discharged after meeting the standards.

[0065] S10. Pave the fiber high-strength water-dense asphalt concrete in the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 4 to 8 cm to obtain the fiber high-strength water-dense asphalt concrete layer below;

[0066] S11 in the fiber high-strength water-tight asphalt concrete layer below the coating fiber non-stick wheel emulsified asphalt, coating thickness 0.4-0.7mm, to obtain a fiber non-stick wheel emulsified asphalt bonding layer;

[0067] S12. Weigh high-elasticity modified asphalt, basalt coarse aggregate, basalt fine aggregate, mineral filler and lignin flocculent fiber in proportion. First, add basalt coarse aggregate, basalt fine aggregate and mineral filler into the preheated mixing tank, dry mix for 20-30 seconds, then add lignin flocculent fiber and stir for 15 to 20 seconds. Pour the prepared high-elasticity modified asphalt into the mixing tank and stir for 40 to 60 seconds to prepare high-elasticity modified asphalt mastic macadam concrete.

[0068] S13 non-stick fiber wheel emulsified asphalt bonding layer paved with highly elastic modified mastic asphalt macadam concrete, paving thickness of 4 to 5cm, to obtain a highly elastic modified mastic asphalt macadam concrete top layer;

[0069] S14. Cool under natural conditions and release to traffic after the surface temperature of the mixture is lower than 50℃.

[0070] Compared with the existing technology, the present invention has the following beneficial effects: 1) The present invention adopts a pavement structure system of "C50 fiber concrete anti-freeze and anti-cracking layer + high-toughness asphalt sand stress absorption layer + fiber high-strength water-tight asphalt concrete lower layer + high-elastic modified asphalt mastic crushed stone concrete upper layer". Through the gradient design of rigid anti-cracking matrix - flexible stress buffer - water-tight load-bearing middle layer - high-elastic damage-resistant surface layer, multi-level crack suppression is achieved. The progressive modulus distribution from rigidity to flexibility from the base layer to the surface layer gradually eliminates the crack expansion energy, while forming a multi-layer waterproof barrier to achieve full-section waterproofing;

[0071] 2) Compared with ordinary asphalt concrete paving materials, the present invention further improves the crack resistance of the bridge deck pavement structure by adding fibers and laying a stress absorption layer. Compared with ordinary asphalt concrete paving materials, the crack resistance is improved by nearly 2 times;

[0072] 3) The waterproof bonding layer and adhesive layer of the present invention respectively adopt fiber water-based epoxy and fiber non-stick wheel emulsified asphalt. The high bonding performance of epoxy resin and the reinforcing effect of fiber significantly improve the bonding strength between the pavement layer and the bridge deck, thereby enhancing the waterproofness and durability of the overall structure. Secondly, the fiber non-stick wheel emulsified asphalt adhesive layer utilizes the dispersion reinforcement effect of fiber and the permeability of emulsified asphalt to further optimize the interlayer bonding performance. At the same time, its "non-stick wheel" characteristic reduces the problem of equipment adhesion during construction, thereby improving construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 Schematic diagram of a cross section of a crack-resistant concrete bridge deck pavement structure according to an embodiment of the present invention;

[0074] Figure numerals: 1. High-elasticity modified asphalt mastic crushed stone concrete upper layer; 2. Fiber high-strength water-dense asphalt concrete lower layer; 3. Fiber non-stick wheel emulsified asphalt bonding layer; 4. High-toughness asphalt sand stress absorption layer; 5. Fiber water-based epoxy anti-cracking and waterproof bonding layer; 6. C50 fiber concrete anti-freeze and anti-cracking layer; 7. Box girder. DETAILED DESCRIPTION

[0075] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0076] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0077] Secondly, the term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0078] Example 1:

[0079] A concrete bridge crack-resistant bridge deck pavement structure and paving method, comprising the following steps:

[0080] (1) Weigh 12 parts of ordinary Portland cement, 63 parts of coarse aggregate crushed stone and natural sand, and 6 parts of fly ash, add them to a mixer and dry mix for 25 seconds. Weigh 5 parts of water and 1 part of polycarboxylic acid water reducer, pour them into a mixer and wet mix for 60 seconds. Weigh 0.8 parts of polypropylene fiber, disperse it and add it to the mixer, and continue wet mixing for 60 seconds to prepare C50 fiber concrete. The performance parameters of C50 fiber concrete are shown in Table 1:

[0081] Table 1 Performance parameters of C50 fiber concrete

[0082] pilot projects unit Test results density <![CDATA[t / m 3 ]]> 2.37 Compressive strength (28 days) MPa 56 Flexural strength (28 days) MPa 7.2 elastic modulus MPa 3.3×104 Slump mm 137 Drying shrinkage (28 days) ％ 0.03

[0083] (2) C50 fiber concrete was poured on the box beam. During the pouring process, the concrete was vibrated with a vibrator for 30 seconds. After pouring, the concrete surface was smoothed and watered for curing. The curing time was 7 days.

[0084] (3) 60 parts of a waterborne epoxy resin main agent and 11 parts of an amine curing agent were weighed and added to a stirrer and stirred for 3 minutes at a stirrer speed of 1000 r / min to prepare a waterborne epoxy resin base mixed solution. 21 parts of calcium carbonate, 2 parts of a polycarboxylate dispersant and 2 parts of a cellulose ether thickener were weighed and added to the base mixed solution in sequence and stirred for 8 minutes. 2 parts of glass fiber were weighed and added to the mixed solution and stirred for 12 minutes using a high-speed stirrer (speed of 1400 r / min) to prepare a fiber waterborne epoxy material. The performance parameters of the fiber waterborne epoxy material are shown in Table 2:

[0085] Table 2 Performance parameters of fiber waterborne epoxy

[0086]

[0087] (4) After fine milling of C50 fiber concrete, a fiber water-based epoxy waterproof bonding layer was mechanically applied to the concrete slab with a coating thickness of 0.8 mm. During the coating process, an appearance inspection was performed to ensure that there was no missing coating.

[0088] (5)(5) Weigh 8 parts of SBS modified asphalt and 0.8 parts of rubber powder, heat them to a fluid state respectively, then add the rubber powder to the SBS modified asphalt, use a high-speed shearing machine (speed 4000r / min) to shear, keep the shearing temperature at 185℃, and shear for 30min to prepare high-toughness SBS modified asphalt for standby use; weigh 82 parts of basalt and 3 parts of limestone powder, put them into a mixing tank and stir for 30s, add the prepared high-toughness SBS modified asphalt, and continue stirring for 60s to prepare high-toughness asphalt sand material. The performance parameters of the high-toughness asphalt sand material are shown in Table 3:

[0089] Table 3 Performance parameters of high toughness asphalt sand

[0090]

[0091] (6) pouring high-toughness asphalt sand on the fiber water-based epoxy anti-cracking waterproof bonding layer with a pouring thickness of 2 cm to form a high-toughness asphalt sand stress absorption layer;

[0092] (7) Weigh 66 parts of fast-cracking cationic emulsified asphalt and heat it to 130°C for later use; weigh 26 parts of water and 1.2 parts of polyvinyl alcohol, add polyvinyl alcohol to the water, and stir at a speed of 800 r / min for 5 minutes to form a homogeneous mixed liquid; add the prepared fast-cracking cationic emulsified asphalt to the mixed liquid, and shear it through a high-speed shearing device (speed of 3000 r / min) for 20 minutes to obtain a non-stick wheel emulsified asphalt matrix; weigh 1 part of glass fiber and add it to the non-stick wheel emulsified asphalt matrix, and continue stirring at a speed of 1000 r / min for 15 minutes to prepare a fiber non-stick wheel emulsified asphalt product. The performance parameters of the fiber non-stick wheel emulsified asphalt product are shown in Table 4:

[0093] Table 4 Performance parameters of fiber non-stick wheel emulsified asphalt

[0094]

[0095] (8) Apply fiber non-stick wheel emulsified asphalt on the high-toughness asphalt sand stress absorption layer by mechanical coating method, with a coating thickness of 0.5 mm;

[0096] (9) The mass ratio of linear low-density polyethylene (LLDPE), low-grade hard asphalt, and nano-elastomer material is 20:65:10;

[0097] The preparation method of the composite multi-effect enhancer is as follows: linear low-density polyethylene with a melt index of 0.5-2g / 10min, low-grade hard asphalt with a needle penetration (25°C, 100g, 5s) of 30-60 (0.1mm), and styrene-butadiene-styrene block copolymer (SBS)-based nano-elastomer material with a particle size of 50-100nm are weighed in proportion; the low-grade hard asphalt is heated to 160-180°C to melt and stirred, and then the LLDPE is slowly added and thoroughly mixed, and then transferred to a high-speed shearing device for shearing treatment; then the nano-elastomer material is added and shearing is continued to uniformly disperse the components; finally, the sample solubility and similarity are tested, and the material is discharged after meeting the standards;

[0098] Weigh 0.9 parts of the above-mentioned composite multi-effect reinforcing agent, 60 parts of limestone coarse aggregate, 30 parts of limestone fine aggregate, and 4.5 parts of limestone mineral powder, add them to a preheated mixing tank and dry mix for 20 seconds, weigh 3.8 parts of SBS modified asphalt, add them to the mixing tank and stir for 45 seconds, weigh 0.3 parts of basalt fiber, add them to the mixing tank and continue stirring for 15 seconds to prepare fiber high-strength water-dense asphalt concrete. The performance parameters of the fiber high-strength water-dense asphalt concrete are shown in Table 5:

[0099] Table 5 Performance parameters of fiber high-strength water-dense asphalt concrete

[0100]

[0101]

[0102] (10) Paving fiber high-strength water-tight asphalt concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 5 cm;

[0103] (11) Mechanically apply fiber non-stick wheel emulsified asphalt on the lower layer of fiber high-strength water-tight asphalt concrete with a coating thickness of 0.5 mm;

[0104] (12) Weigh 5.5 parts of high-elasticity modified asphalt and set aside; weigh 62 parts of basalt coarse aggregate, 27 parts of basalt fine aggregate, and 7 parts of mineral filler, pour them into a mixing tank and dry mix for 20-30 seconds; weigh 0.3 parts of lignin flocculent fiber, pour them into the mixing tank and continue stirring for 15 seconds; pour the prepared high-elasticity modified asphalt into the mixing tank and continue stirring for 45 seconds to prepare high-elasticity modified asphalt mastic macadam concrete;

[0105] (13) Pave high elastic modified asphalt mastic crushed stone concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 4 cm;

[0106] (14) Cool under natural conditions and release to traffic after the surface temperature of the mixture is lower than 50℃.

[0107] Example 2:

[0108] A concrete bridge crack-resistant bridge deck pavement structure and paving method, comprising the following steps:

[0109] (1) Weigh 13 parts of sulphoaluminate cement, 65 parts of coarse aggregate crushed stone and machine-made sand, and 8 parts of silica fume, add them to a mixer and dry mix for 30 seconds. Weigh 6 parts of water, 1.5 parts of polycarboxylic acid-based water reducer and rosin-based air entraining agent, pour them into a mixer and wet mix for 60 seconds. Weigh 1 part of polypropylene fiber and disperse it into the mixer. Continue wet mixing for 80 seconds to prepare C50 fiber concrete. The performance parameters of C50 fiber concrete are shown in Table 6:

[0110] Table 6 Performance parameters of C50 fiber concrete

[0111]

[0112]

[0113] (2) C50 fiber concrete was poured on the box beam. During the pouring process, the concrete was vibrated with a vibrator for 40 seconds. After pouring, the concrete surface was smoothed and watered for curing. The curing time was 7 days.

[0114] (3) Weigh 63 parts of waterborne epoxy resin main agent and 12 parts of polyamide curing agent, add them into a stirrer and stir for 4 minutes at a stirrer speed of 1000 r / min to prepare a waterborne epoxy resin base mixed solution, weigh 22 parts of talcum powder and 2 parts of polycarboxylate dispersant, add them to the base mixed solution in sequence, stir for 9 minutes, weigh 3 parts of glass fiber, add them to the mixed solution, and continue stirring for 15 minutes using a high-speed stirrer (speed of 1600 r / min) to prepare a fiber waterborne epoxy material. The performance parameters of the fiber waterborne epoxy material are shown in Table 7;

[0115] Table 7 Performance parameters of fiber waterborne epoxy

[0116]

[0117] (4) After fine milling of the C50 fiber concrete, a fiber water-based epoxy waterproof bonding layer was mechanically applied to the concrete slab with a coating thickness of 1.0 mm. During the coating process, an appearance inspection was performed to ensure that there was no missing coating.

[0118] (5) Weigh 9 parts of SBS modified asphalt and 1 part of rubber powder, heat them to a fluid state, then add the rubber powder to the SBS modified asphalt and shear them using a high-speed shearing machine (speed 4000 r / min). The shearing temperature is maintained at 185°C and the shearing time is 25 min to prepare high-toughness SBS modified asphalt for later use. Weigh 84 parts of limestone and 4 parts of limestone powder, put them into a mixing tank and stir for 40 seconds, add the prepared high-toughness SBS modified asphalt, and continue stirring for 70 seconds to prepare high-toughness asphalt sand material. The performance parameters of the high-toughness asphalt sand material are shown in Table 8:

[0119] Table 8 Performance parameters of high toughness asphalt sand

[0120]

[0121] (6) pouring high-toughness asphalt sand on the fiber water-based epoxy anti-cracking waterproof bonding layer with a pouring thickness of 3 cm;

[0122] (7) Weigh 68 parts of fast-cracking cationic emulsified asphalt and heat it to 130°C for later use; weigh 27 parts of water and 1.5 parts of carboxymethyl cellulose, add carboxymethyl cellulose to the water, and stir at a speed of 1000 r / min for 6 minutes to form a homogeneous mixed liquid; add the prepared fast-cracking cationic emulsified asphalt to the mixed liquid, and shear it through a high-speed shearing device (speed of 3500 r / min) for 25 minutes to obtain a non-stick wheel emulsified asphalt matrix; weigh 2 parts of glass fiber and add it to the non-stick wheel emulsified asphalt matrix, and continue stirring at a speed of 1200 r / min for 18 minutes to prepare a fiber non-stick wheel emulsified asphalt product. The performance parameters of the fiber non-stick wheel emulsified asphalt product are shown in Table 9:

[0123] Table 9 Performance parameters of fiber non-stick wheel emulsified asphalt

[0124]

[0125]

[0126] (8) Apply fiber non-stick wheel emulsified asphalt on the high-toughness asphalt sand stress absorption layer by mechanical coating method, with a coating thickness of 0.6 mm;

[0127] (9) The preparation method of the composite multi-effect enhancer is the same as that of Example 1;

[0128] 1 part of composite multi-effect reinforcing agent, 62 parts of limestone coarse aggregate, 33 parts of limestone fine aggregate, and 5 parts of limestone mineral powder were weighed and added to a preheated mixing tank and dry mixed for 25 seconds. 4 parts of SBS modified asphalt were weighed and added to the mixing tank and stirred for 50 seconds. 0.4 parts of basalt fiber were weighed and added to the mixing tank and stirred for 20 seconds to prepare fiber high-strength water-dense asphalt concrete. The performance parameters of the fiber high-strength water-dense asphalt concrete are shown in Table 10.

[0129] Table 10 Performance parameters of fiber high-strength water-dense asphalt concrete

[0130] pilot projects unit Test results Porosity ％ 2.0 Low temperature bending failure strain με 2543 Dynamic stability (60℃) times / mm 11349 Four-point bending fatigue life 200με (times) Second-rate >1 million Freeze-thaw splitting strength ratio TSR ％ 83.6 Dynamic modulus (15℃, 10Hz) MPa 16900

[0131] (10) Paving fiber high-strength water-tight asphalt concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 6 cm;

[0132] (11) Mechanically apply fiber non-stick wheel emulsified asphalt on the lower layer of fiber high-strength water-tight asphalt concrete with a coating thickness of 0.4 mm;

[0133] (12) Weigh 6 parts of high-elasticity modified asphalt and set aside; weigh 65 parts of basalt coarse aggregate, 28 parts of basalt fine aggregate, and 8 parts of mineral filler, pour them into a mixing tank and dry mix for 30 seconds; weigh 0.4 parts of lignin flocculent fiber, pour them into the mixing tank and continue stirring for 20 seconds; pour the prepared high-elasticity modified asphalt into the mixing tank and continue stirring for 50 seconds to prepare high-elasticity modified asphalt mastic macadam concrete;

[0134] (13) Pave high elastic modified asphalt mastic crushed stone concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 5 cm;

[0135] (14) Cool under natural conditions and release to traffic after the surface temperature of the mixture is lower than 50℃.

[0136] Example 3:

[0137] A concrete bridge crack-resistant bridge deck pavement structure and paving method, comprising the following steps:

[0138] (1) Weigh 15 parts of sulphoaluminate cement, 68 parts of coarse aggregate crushed stone and machine-made sand, and 9 parts of slag powder, add them to a mixer and dry mix for 30 seconds. Weigh 6.5 parts of water, 1.8 parts of polycarboxylic acid water reducer and nitrite antifreeze, pour them into a mixer and wet mix for 60 seconds. Weigh 1.2 parts of steel fiber, add them to the mixer in a dispersed manner, and continue wet mixing for 90 seconds to prepare C50 fiber concrete. The performance parameters of C50 fiber concrete are shown in Table 11:

[0139] Table 11 Performance parameters of C50 fiber concrete

[0140] pilot projects unit Test results density <![CDATA[t / m 3 ]]> 2.4 Compressive strength (28 days) MPa 57.9 Flexural strength (28 days) MPa 7.8 elastic modulus MPa <![CDATA[3.39×10 4 ]]> Slump mm 137 Drying shrinkage (28 days) ％ 0.03

[0141] (2) C50 fiber concrete was poured on the box beam. During the pouring process, the concrete was vibrated with a vibrator for 40 seconds. After pouring, the concrete surface was smoothed and watered for curing. The curing time was 7 days.

[0142] (3) Weigh 65 parts of waterborne epoxy resin main agent and 13 parts of polyamide curing agent, add them into a stirrer and stir for 5 minutes at a stirrer speed of 800 r / min to prepare a waterborne epoxy resin basic mixed solution, weigh 21 parts of quartz powder and 3 parts of polyurethane thickener, add them to the basic mixed solution in sequence, stir for 10 minutes, weigh 4 parts of glass fiber, add them to the mixed solution, and continue stirring for 15 minutes using a high-speed stirrer (speed of 1500 r / min) to prepare a fiber waterborne epoxy material. The performance parameters of the fiber waterborne epoxy material are shown in Table 12:

[0143] Table 12 Performance parameters of fiber water-based epoxy

[0144]

[0145] (4) After fine milling of the C50 fiber concrete, a fiber water-based epoxy waterproof bonding layer was mechanically applied to the concrete slab with a coating thickness of 1.1 mm. During the coating process, an appearance inspection was performed to ensure that there was no missing coating.

[0146] (5) Weigh 9.5 parts of SBS modified asphalt and 1.2 parts of rubber powder, heat them to a fluid state, then add the rubber powder to the SBS modified asphalt and shear them using a high-speed shearing machine (speed 4000 r / min). The shearing temperature is maintained at 190°C and the shearing time is 30 minutes to prepare high-toughness SBS modified asphalt for later use. Weigh 88 parts of basalt and 5 parts of limestone powder, put them into a mixing tank and stir for 40 seconds, add the prepared high-toughness SBS modified asphalt, and continue stirring for 60 seconds to prepare high-toughness asphalt sand material. The performance parameters of the high-toughness asphalt sand material are shown in Table 13:

[0147] Table 13 Performance parameters of high toughness asphalt sand

[0148]

[0149] (6) pouring high-toughness asphalt sand on the fiber water-based epoxy anti-cracking waterproof bonding layer with a pouring thickness of 2.5 cm;

[0150] (7) Weigh 70 parts of fast-cracking cationic emulsified asphalt and heat it to 140°C for later use; weigh 28 parts of water and 1.8 parts of carboxymethyl cellulose, add carboxymethyl cellulose to the water, and stir at a speed of 1200 r / min for 5 minutes to form a homogeneous mixed liquid; add the prepared fast-cracking cationic emulsified asphalt to the mixed liquid, and shear it through a high-speed shearing device (speed of 4000 r / min) for 30 minutes to obtain a non-stick wheel emulsified asphalt matrix; weigh 2.5 parts of glass fiber and add it to the non-stick wheel emulsified asphalt matrix, and continue stirring at a speed of 1500 r / min for 15 minutes to prepare a fiber non-stick wheel emulsified asphalt product. The performance parameters of the fiber non-stick wheel emulsified asphalt product are shown in Table 14:

[0151] Table 14 Performance parameters of fiber non-stick wheel emulsified asphalt

[0152]

[0153] (8) Apply fiber non-stick wheel emulsified asphalt on the high-toughness asphalt sand stress absorption layer by mechanical coating method, with a coating thickness of 0.6 mm;

[0154] (9) The preparation method of the composite multi-effect enhancer is the same as that of Example 1;

[0155] Weigh 1.1 parts of composite multi-effect reinforcing agent, 65 parts of limestone coarse aggregate, 32 parts of limestone fine aggregate, and 5.5 parts of limestone mineral powder, add them to a preheated mixing tank and dry mix for 30 seconds, weigh 4.2 parts of SBS modified asphalt, add them to the mixing tank and stir for 60 seconds, weigh 0.5 parts of basalt fiber, add them to the mixing tank and continue stirring for 20 seconds to prepare fiber high-strength water-dense asphalt concrete. The performance parameters of fiber high-strength water-dense asphalt concrete are shown in Table 15:

[0156] Table 15 Performance parameters of fiber high-strength water-dense asphalt concrete

[0157]

[0158]

[0159] (10) Paving fiber high-strength water-tight asphalt concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 7 cm;

[0160] (11) Mechanically apply fiber non-stick wheel emulsified asphalt on the lower layer of fiber high-strength water-tight asphalt concrete with a coating thickness of 0.45 mm;

[0161] (12) Weigh 7 parts of high-elasticity modified asphalt and set aside; weigh 68 parts of basalt coarse aggregate, 27 parts of basalt fine aggregate, and 9 parts of mineral filler, pour them into a mixing tank and dry mix for 20 seconds; weigh 0.3 parts of lignin flocculent fiber, pour them into the mixing tank and continue stirring for 15 seconds; pour the prepared high-elasticity modified asphalt into the mixing tank and continue stirring for 60 seconds to prepare high-elasticity modified asphalt mastic macadam concrete;

[0162] (13) Pave high elastic modified asphalt mastic crushed stone concrete on the fiber non-stick wheel emulsified asphalt bonding layer with a paving thickness of 4 cm;

[0163] (14) Cool under natural conditions and release to traffic after the surface temperature of the mixture is lower than 50℃.

[0164] The following tests were performed on Examples 1 to 3:

[0165] A crack width gauge (accuracy ±0.01mm) was used to scan the cracks on the pavement surface regularly (1 day, 7 days, 30 days, 6 months, and 1 year after construction), focusing on monitoring load-sensitive areas (such as mid-span and support points). The data in Table 16 were obtained:

[0166] Table 16 Data after one year of operation

[0167]

[0168]

[0169] Using a fatigue loading tester (simulating vehicle load, frequency 5 Hz, load range 30%-80% of standard axle load), cyclic loading was performed 1 million times, and the number of crack initiation and extension length were simultaneously recorded. The data in Table 17 were obtained:

[0170] Table 17 Cyclic loading data

[0171]

[0172] Examples 1 to 3 were subjected to freeze-thaw cycle tests: 50 cycles at -20°C to 20°C; and salt spray corrosion test: 5% NaCl solution spray for 1000 hours; the data in Table 18 were obtained:

[0173] Table 18 Freeze-thaw cycle test and salt spray corrosion test results

[0174] Mass loss rate (%) Strength retention rate (%) Example 1 0.91 95.3 Example 2 0.86 94.8 Example 3 0.87 94.7

[0175] The test data of Examples 1-3 show that all three perform excellently in crack control, fatigue resistance and durability: after one year of operation, the crack density is 1-2 per 100 m2, and the maximum crack width is 0.10-0.11 mm, which is significantly lower than the common 5 per 100 m2 and crack levels of 0.15 mm or above in traditional pavements, and no through-going cracks appear; in the cyclic loading test, the number of crack initiation cycles reaches 880,000-920,000 times, which is significantly delayed compared with the 500,000 times of traditional pavements, and the expansion rate is only 0.01-0.02 mm / 100,000 times, and the fatigue crack resistance is increased by nearly 1 times; after 50 freeze-thaw cycles, the mass loss rate is 0.86%-0.91% (far lower than the 3% threshold of traditional pavements), and the strength retention rate reaches 94.7%-95.3% after 1000 hours of salt spray corrosion, all showing excellent weather resistance and structural stability. The data differences among the three groups of embodiments are relatively small, indicating that the crack-resistant bridge deck pavement structure has stable performance, effectively solving the problems of easy initiation and expansion of cracks in traditional pavement and insufficient durability, and meeting long-term service requirements.

[0176] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A concrete bridge anti-crack type bridge deck pavement structure, characterized in that: From top to bottom, they are the high elastic modified asphalt mastic macadam concrete upper layer (1), the fiber non-stick wheel emulsified asphalt bonding layer (3), the fiber high strength water-tight asphalt concrete lower layer (2), the fiber non-stick wheel emulsified asphalt bonding layer (3), the high toughness asphalt sand stress absorption layer (4), the fiber water-based epoxy anti-cracking waterproof bonding layer (5) and the C50 fiber concrete anti-freeze and anti-cracking layer (6).

2. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The thickness of the high-elastic modified asphalt mastic macadam concrete top layer (1) is 4-5 cm; The thickness of the fiber high-strength water-tight asphalt concrete lower layer (2) is 4-8 cm; The thickness of the fiber non-stick wheel emulsified asphalt bonding layer (3) is 0.4-0.7 mm; The thickness of the high-toughness asphalt sand stress absorption layer (4) is 2-4 cm; The thickness of the fiber water-based epoxy anti-cracking and waterproof bonding layer (5) is 0.8-1.2 mm; The thickness of the C50 fiber concrete antifreeze and anti-cracking layer (6) is 8-10 cm.

3. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The C50 fiber concrete antifreeze and anti-cracking layer (6) is composed of cement, aggregate, mineral admixture, fiber, admixture and water, and the mass ratio thereof is 10-15:60-70:5-10:0.5-2:0.5-2:4-8.

4. The anti-crack concrete bridge deck pavement structure according to claim 3, characterized in that: The cement is ordinary Portland cement or sulphoaluminate cement, the aggregate includes coarse aggregate and fine aggregate, the coarse aggregate is crushed stone with a particle size of 5-20 mm, and the fine aggregate is natural sand or machine-made sand with a particle size of 0.15-5 mm; The mineral admixture is one or more of fly ash, slag powder or silica fume; The fibers are one or more of polypropylene fibers, steel fibers, glass fibers, or basalt fibers; The admixture is one or more of a water reducer, an air entraining agent or an antifreeze agent.

5. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The fiber water-based epoxy anti-cracking and waterproof bonding layer (5) is composed of a water-based epoxy resin main agent, a curing agent, fibers, fillers and additives, and the mass ratio thereof is 60-65:10-15:1-5:20-25:1-5; The epoxy equivalent of the waterborne epoxy resin main agent is 200-500g / eq, the curing agent is one of an amine curing agent or a polyamide curing agent, and its amine value is 150-400mgKOH / g; the fiber is glass fiber; the filler is one or more of calcium carbonate, talc, silica powder or quartz powder; and the auxiliary agent includes one or more of a dispersant and a thickener.

6. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The high-toughness asphalt sand stress absorption layer (4) has a porosity of 8-12% and is composed of SBS modified asphalt, aggregate, mineral filler and toughening agent, with a mass ratio of 8-10:80-90:3-5:0.5-2; The aggregate is any one or a mixture of crushed stone or machine-made sand prepared from limestone, granite, or basalt, with a particle size of 0-4.75 mm. The mineral filler is one or a mixture of limestone powder, cement, or mineral powder. The toughening agent is rubber powder, with a particle size of 0.075-2 mm and an ash content of ≤8%.

7. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The fiber non-stick wheel emulsified asphalt bonding layer (3) is spread at a rate of 0.4-0.7 kg / m² and is composed of emulsified asphalt, fiber, water and stabilizer, with a mass ratio of 65-70:0.5-3:25-30:1-2; The emulsified asphalt is a fast-cracking cationic emulsified asphalt, the fiber is glass fiber, and the stabilizer is one of polyvinyl alcohol and carboxymethyl cellulose.

8. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The fiber high-strength water-tight asphalt concrete lower layer (2) is composed of SBS modified asphalt, composite multi-effect reinforcing agent, limestone coarse aggregate, limestone fine aggregate, limestone mineral powder and fiber, and the mass ratio thereof is 3.5~4.5:0.8~1.2:60~65:30~35:4~6:0.2~0.5; The composite multi-effect enhancer is prepared by compounding linear low-density polyethylene (LLDPE) with low-grade hard asphalt and nano-elastomer material, with a solubility of ≥98% and a similarity of ≥98%. The fiber is basalt fiber. The void ratio of the fiber high-strength water-tight asphalt concrete lower layer (2) is 1.5-2.5%.

9. The anti-crack concrete bridge deck pavement structure according to claim 1, characterized in that: The high elastic modified asphalt mastic crushed stone concrete top layer (1) is composed of high elastic modified asphalt, basalt coarse aggregate, basalt fine aggregate, mineral filler and lignin flocculent fiber, and the mass ratio thereof is 5-7:60-70:25-30:5-10:4-6:0.2-0.5; Calculated by weight, the high-elastic modified asphalt includes 93-98 parts of SBS modified asphalt, 4-6 parts of waste tire rubber powder and 0.2-0.5 parts of polyethylene wax stabilizer.

10. A method for paving a crack-resistant concrete bridge deck pavement structure, characterized in that: The C50 fiber concrete antifreeze and anti-cracking layer (6), the fiber water-based epoxy anti-cracking and waterproof bonding layer (5), the high-toughness asphalt sand stress absorption layer (4), the fiber non-stick wheel emulsified asphalt bonding layer (3), the fiber high-strength water-tight asphalt concrete lower layer (2), the fiber non-stick wheel emulsified asphalt bonding layer (3) and the high-elasticity modified asphalt mastic macadam concrete upper layer (1) are sequentially prepared on the box beam (7).

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