Bridge deck pavement structure suitable for large-span steel bridge and pavement method

Abstract

The invention discloses a bridge deck pavement structure suitable for a large-span steel bridge and a pavement method, belongs to the field of steel bridge deck pavement, realizes steel bridge deck pavement in a conventional mixture form, and meets the waterproof, high-temperature-resistant and anti-cracking requirements. The invention discloses a bridge deck pavement structure suitable for a large-span steel bridge. The bridge deck pavement structure comprises a steel bridge deck, a cold-mixed resin asphalt macadam waterproof bonding layer, a cold-mixed resin asphalt mixture RA lower pavement layer, a high-glue modified asphalt macadam bonding layer and a black thermochromic asphalt SMA upper pavement layer which are sequentially arranged from bottom to top. The adverse high-temperature condition of the pavement layer is improved by doping the thermochromic material into the upper pavement layer SMA, the pavement waterproof and anti-cracking capacity is improved through the high-strength and low-void-ratio RA lower pavement layer, the construction method of the pavement structure is simple and convenient in process and low in cost, the requirement can be met only by short maintenance, and the pavement structure is suitable for construction and maintenance of large-span steel bridge deck pavement.

Description

Technical Field

[0001] The present invention relates to the technical field of steel bridge deck pavement, and particularly relates to a pavement structure and a pavement method suitable for long-span steel bridges. Background Art

[0002] The pavement of steel bridge decks has always been the focus and difficulty of engineering research. The main reasons include the following three points. First, in the high-temperature season, the temperature of the pavement layer can approach 70°C. Under this temperature condition, the material structure performance of the pavement layer is tested. Second, due to economic reasons and the structure of the steel bridge, the thickness of the pavement layer is restricted and cannot be too thick. The total thickness is generally 5-8 cm, and diseases such as fatigue damage and fatigue cracks are likely to occur under the action of vehicle loads. Third, the smooth surface of the steel bridge deck is difficult to bond with the pavement layer, and improper waterproofing and anti-corrosion will accelerate the interlayer damage.

[0003] At present, the main pavement systems for long-span steel bridge decks are double-layer SMA pavement systems, epoxy pavement systems, and cast asphalt concrete pavement systems. The double-layer SMA pavement system has poor adhesion between the pavement layer and the steel plate, and a series of early diseases are likely to occur; the cast pavement system has good coordination with the steel plate, but has poor high-temperature performance and high construction costs; the epoxy pavement system has excellent high-temperature performance and anti-fatigue performance, but the materials are expensive and the construction difficulty is large.

[0004] Therefore, it is of great significance to develop a steel bridge deck pavement structure that adapts to high-temperature environments, improves the adhesion performance of the bonding layer of the pavement system, is convenient for construction, and has low costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a steel bridge deck pavement material, structure, and pavement method, which are particularly suitable for long-span steel box girder bridges, have simple processes, reliable quality, can relieve the poor high-temperature conditions of the pavement layer, and have excellent waterproof performance and adhesion performance between each pavement layer.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: A pavement structure suitable for long-span steel bridges, characterized in that it includes a steel bridge deck, a cold-mixed resin asphalt gravel waterproof bonding layer, a cold-mixed resin asphalt mixture RA lower layer, a high-glue modified asphalt gravel bonding layer, and a black thermochromic asphalt SMA upper layer, which are arranged in sequence from bottom to top; The cold-mixed resin asphalt gravel waterproof bonding layer includes resin asphalt and gravel with a particle size of 3-5 mm evenly distributed on the resin asphalt. The coating amount of the resin asphalt on the steel bridge deck is 0.9-1.1 kg / m 2 , and the spreading amount of the gravel is 2.5-4.5 kg / m 2 ; The cold-mixed resin asphalt mixture RA lower layer is cold-mixed resin asphalt mixture RA05 with a thickness of 25 mm; The high-gum modified asphalt gravel bonding layer includes high-gum modified asphalt and gravel with a particle size of 10 - 13 mm evenly distributed on the high-gum modified asphalt. The coating amount of the high-gum modified asphalt on the cold-mixed resin asphalt mixture RA lower layer is 0.8 - 1.0 kg / m 2 and the gravel spreading amount is 3.0 - 5.0 kg / m 2 ; The black thermochromic asphalt SMA upper layer is black thermochromic asphalt SMA-13 with a thickness of 40 mm.

[0007] As a preferred technical solution of the present invention: The resin asphalt is composed of the following raw material components and weight percentages: epoxy resin 40%, petroleum asphalt 40%, and modified amine curing agent 20%.

[0008] As a preferred technical solution of the present invention: The modified amine curing agent is methylene diphenylamine or polyethylenepolyamine.

[0009] As a preferred technical solution of the present invention: For the cold-mixed resin asphalt mixture RA05, the nominal maximum particle size of the gradation is 4.75 mm. By weight ratio, the passing rate of sieve hole 4.75 mm is greater than 95%, the passing rate of sieve hole 4.75 mm is 90 - 100%, the passing rate of sieve hole 2.36 mm is 55 - 72%, the passing rate of sieve hole 1.18 mm is 35 - 55%, the passing rate of sieve hole 0.6 mm is 25 - 43%, the passing rate of sieve hole 0.3 mm is 16 - 30%, the passing rate of sieve hole 0.15 mm is 12 - 22%, and the passing rate of sieve hole 0.075 mm is 8 - 16%; The cold-mixed resin asphalt mixture RA05 is designed for the mix ratio by the Marshall test method, and the asphalt-aggregate ratio is 6.0% - 8.0%.

[0010] As a preferred technical solution of the present invention: For the black thermochromic asphalt SMA-13, the nominal maximum particle size is 9.5 mm. For the initial gradation by weight ratio, the passing rate of sieve hole 13.2 mm is 90% - 100%, the passing rate of sieve hole 9.5 mm is 50% - 75%, the passing rate of sieve hole 4.75 mm is 20 - 34%, the passing rate of sieve hole 2.36 mm is 15 - 26%, the passing rate of sieve hole 1.18 mm is 14 - 24%, the passing rate of sieve hole 0.6 mm is 12 - 20%, the passing rate of sieve hole 0.3 mm is 10 - 16%, the passing rate of sieve hole 0.15 mm is 9 - 15%, and the passing rate of sieve hole 0.075 mm is 8 - 12%; The black thermochromic asphalt SMA-13 will be incorporated into the high-gum modified asphalt at a mass ratio of 3% - 6% to prepare the black thermochromic asphalt SMA upper layer, and the mix ratio is designed by the Marshall test method, and the asphalt-aggregate ratio is 5.0% - 6.0%.

[0011] As a preferred technical solution of the present invention: the high-rubber modified asphalt is SBS modified asphalt, which is prepared by incorporating rubber masterbatch powder with a dosage of 15%.

[0012] As a preferred technical solution of the present invention: the black thermochromic asphalt SMA-13 is composed of three parts: a leuco dye, a developer, and a solvent. The leuco dye is triarylmethane, diallyl phthalate, or propyl methanol; the developer is phenol, hydroxy acid, sulfonic acid, or metal salt; the solvent is alcohol, mercaptan, ketone ether, phosphate ester, or carbonate ester. The leuco dye, developer, and solvent are microencapsulated to prepare a solid material with a particle size of 3 - 5 nm.

[0013] A bridge deck paving method suitable for long-span steel bridges, characterized by comprising the following steps: S1. Sandblasting and derusting the steel bridge deck; S2. Laying a cold-mixed resin asphalt gravel waterproof bonding layer above the steel bridge deck; S3. Laying a cold-mixed resin asphalt mixture RA bottom layer above the cold-mixed resin asphalt gravel waterproof bonding layer; S4. Laying a high-rubber modified asphalt gravel bonding layer above the cold-mixed resin asphalt mixture RA bottom layer; S5. 24 hours after laying the high-rubber modified asphalt gravel bonding layer, laying a black thermochromic asphalt SMA top layer above it.

[0014] As a preferred technical solution of the present invention: in step S1, the standards for sandblasting and derusting the steel bridge deck are as follows: the cleanliness of machine grinding derusting reaches Sa2.5 level, and the roughness reaches 80 - 120 μm; the cleanliness of manual grinding derusting reaches St3.0 level, and the roughness reaches 30 - 70 μm.

[0015] As a preferred technical solution of the present invention: in step S4, before laying the high-rubber modified asphalt gravel bonding layer, the top surface of the cold-mixed resin asphalt mixture RA bottom layer is milled, and the milling depth is 3 - 5 mm.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The cold-mixed resin asphalt gravel waterproof bonding layer can be constructed at normal temperature, and can form a relatively high strength in a short time, with good bonding performance. The scattered gravel can further prevent the paving layer from slipping.

[0017] The cold-mixed resin asphalt mixture RA bottom layer can be constructed at normal temperature, and can quickly form strength. Moreover, the material has excellent high and low temperature performance, small void ratio, good waterproof performance, and thin thickness, which can reduce the dead load of the bridge.

[0018] The high-glue modified asphalt crushed stone bonding layer improves the bonding performance between the upper and lower layers, and the spread crushed stone can further prevent the pavement layer from slipping.

[0019] The black thermochromic asphalt SMA overlay features a dense, embedded skeleton structure with excellent high-temperature performance. The rubber added to the asphalt replaces commonly used basalt and lignin fibers, providing enhanced oil absorption and solidification, effectively improving the mixture's road performance. Thermochromic asphalt, prepared by adding thermochromic materials to high-rubber modified asphalt, can actively change color and reflectivity based on ambient temperature, effectively lowering summer temperatures on asphalt pavement and reducing heat-related damage. It also slows down winter temperature drops, helping to prevent road icing.

[0020] Different from the double-layer SMA paving system, epoxy paving system and cast asphalt concrete paving system, the construction method of the paving structure of the present invention is simple and has low material cost. It can be used after a short oxidation time and is suitable for the construction and maintenance of large-span steel bridge deck pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of a steel bridge deck pavement structure layer of the present invention; Figure 2 It is a table chart of resin asphalt indicators; Figure 3 This is a table chart of rubber masterbatch powder indicators; Figure 4 This is a table chart of high-glue modified asphalt indicators; Figure 5 The RA05 index of cold mix resin asphalt mixture meets the table; Figure 6 It is a table chart of black thermochromic asphalt indicators; Figure 7 The indicators of black thermochromic asphalt SMA-13 meet the table.

[0022] Explanation of the attached figures: 1. Steel bridge deck; 2. Cold-mixed resin asphalt macadam waterproof bonding layer; 3. Cold-mixed resin asphalt mixture RA underlay; 4. High-glue modified asphalt macadam bonding layer; 5. Black thermochromic asphalt SMA overlay. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: like Figure 1As shown, the present invention proposes a bridge deck pavement structure suitable for long-span steel bridges, comprising, arranged from bottom to top, a steel bridge deck 1, a cold-mix resin asphalt macadam waterproof bonding layer 2, a cold-mix resin asphalt mixture RA lower layer 3, a high-resin modified asphalt macadam bonding layer 4, and a black thermochromic asphalt SMA upper layer 5; The cold-mixed resin asphalt gravel waterproof bonding layer 2 includes resin asphalt and gravel with a particle size of 3-5 mm uniformly dispersed on the resin asphalt. The coating amount of the resin asphalt on the steel bridge deck 1 is 0.9-1.1 kg / m 2 The amount of gravel spread is 2.5-4.5kg / m 2 ; The selection criteria for resin asphalt should meet Figure 2 As shown, The cold-mixed resin asphalt mixture RA lower layer 3 is cold-mixed resin asphalt mixture RA05, with a thickness of 25 mm; The high-rubber modified asphalt gravel bonding layer 4 includes high-rubber modified asphalt and gravel with a particle size of 10-13 mm evenly distributed on the high-rubber modified asphalt. The coating amount of the high-rubber modified asphalt on the lower layer 3 of the cold-mixed resin asphalt mixture RA is 0.8-1.0 kg / m 2 The amount of gravel spread is 3.0-5.0kg / m 2 ; The black thermochromic asphalt SMA upper layer 5 is black thermochromic asphalt SMA-13, with a thickness of 40 mm.

[0024] The resin pitch is composed of the following raw material components and weight percentages: 40% epoxy resin, 40% petroleum asphalt and 20% modified amine curing agent. The modified amine curing agent is methylene dianiline or polyethylene polyamine.

[0025] The cold-mixed resin asphalt mixture RA05 has a nominal maximum particle size of 4.75 mm. By weight, the pass rate of a 4.75 mm sieve hole is greater than 95%, the pass rate of a 4.75 mm sieve hole is 90-100%, the pass rate of a 2.36 mm sieve hole is 55-72%, the pass rate of a 1.18 mm sieve hole is 35-55%, the pass rate of a 0.6 mm sieve hole is 25-43%, the pass rate of a 0.3 mm sieve hole is 16-30%, the pass rate of a 0.15 mm sieve hole is 12-22%, and the pass rate of a 0.075 mm sieve hole is 8-16%. The cold-mixed resin asphalt mixture RA05 is designed for mix proportioning using the Marshall test method, with an asphalt-stone ratio of 6.0%-8.0%. By adjusting the gradation and controlling the asphalt-stone ratio to 6.0-8.0%, each indicator is met. Figure 5 The parameters shown, The black thermochromic asphalt SMA-13 has a nominal maximum particle size of 9.5 mm. The initial gradation is by weight ratio. The passing rate of the sieve hole of 13.2 mm is 90% - 100%, the passing rate of the sieve hole of 9.5 mm is 50% - 75%, the passing rate of the sieve hole of 4.75 mm is 20 - 34%, the passing rate of the sieve hole of 2.36 mm is 15 - 26%, the passing rate of the sieve hole of 1.18 mm is 14 - 24%, the passing rate of the sieve hole of 0.6 mm is 12 - 20%, the passing rate of the sieve hole of 0.3 mm is 10 - 16%, the passing rate of the sieve hole of 0.15 mm is 9 - 15%, and the passing rate of the sieve hole of 0.075 mm is 8 - 12%. The black thermochromic asphalt SMA-13 will be incorporated into the high-viscosity modified asphalt at a mass ratio of 3% - 6% to prepare the upper layer 3 of the black thermochromic asphalt SMA. The black thermochromic asphalt SMA-13 should meet Figure 6 the parameters shown, and the mix design is carried out by the Marshall test method. The asphalt-aggregate ratio is 5.0% - 6.0%. By adjusting the gradation and controlling the asphalt-aggregate ratio of 5.0 - 6.0%, each index meets Figure 7 the parameters shown.

[0026] The high-viscosity modified asphalt is SBS modified asphalt, which is prepared by incorporating a rubber masterbatch powder with a dosage of 15%.

[0027] The selection of the rubber masterbatch powder should meet Figure 3 the parameters shown.

[0028] The selection of the high-viscosity modified asphalt should meet Figure 4 the parameters shown.

[0029] The black thermochromic asphalt SMA-13 consists of three parts: a leuco dye, a developer, and a solvent. The leuco dye is triarylmethane, diallyl phthalate, or propyl methanol; the developer is phenol, hydroxy acid, sulfonic acid, or metal salt; the solvent is alcohol, mercaptan, ketone ether, phosphate ester, or carbonate ester. The leuco dye, developer, and solvent are microencapsulated to prepare a solid material with a particle size of 3 - 5 nm.

[0030] A bridge deck paving method applicable to long-span steel bridges includes the following steps: S1. Sandblasting and derusting on the steel bridge deck 1; Specifically: The steel bridge deck 1 is subjected to sandblasting and derusting treatment to make its cleanliness reach Sa2.5 level and roughness reach 80 - 120 μm; the cleanliness of manual small-range grinding and derusting reaches St3.0 level and roughness reaches 30 - 70 μm; S2. Laying a cold-mixed resin asphalt gravel waterproof bonding layer 2 above the steel bridge deck 1; Specifically: When the steel plates on the steel bridge deck 1 are dry, clean, the temperature is higher than 10°C, and it is confirmed that there will be no rain or fog during the construction on the same day, the resin asphalt can be sprayed, and the dosage is 0.9 - 1.1 kg / m 2 , immediately spray 3 - 5 mm gravel after the epoxy resin spraying is completed, and the spraying amount is 2.5 - 4.5 kg / m 2 ; S3. Lay the cold-mixed resin asphalt mixture RA bottom layer 3 above the cold-mixed resin asphalt gravel waterproof bonding layer 2; Specifically: The nominal maximum particle size of the cold-mixed resin asphalt mixture RA bottom layer 3 is 4.75 mm. By weight ratio, the passing rate of sieve hole 4.75 mm is greater than 95%, the passing rate of sieve hole 4.75 mm is 90 - 100%, the passing rate of sieve hole 2.36 mm is 55 - 72%, the passing rate of sieve hole 1.18 mm is 35 - 55%, the passing rate of sieve hole 0.6 mm is 25 - 43%, the passing rate of sieve hole 0.3 mm is 16 - 30%, the passing rate of sieve hole 0.15 mm is 12 - 22%, and the passing rate of sieve hole 0.075 mm is 8 - 16%; S4. Lay the high-viscosity modified asphalt gravel bonding layer 4 above the cold-mixed resin asphalt mixture RA bottom layer 3; Specifically: After the cold-mixed resin asphalt mixture RA bottom layer 3 is cured by curing, the top surface of the cold-mixed resin asphalt mixture RA bottom layer 3 is finely planed, and the planing depth is 3 - 5 mm. After the fine planing is completed, high-viscosity modified asphalt is sprayed, and the dosage is 0.8 - 1.0 kg / m 2 , immediately spray 10 - 13 mm gravel after the high-viscosity modified asphalt spraying is completed, and the spraying amount is 3.0 - 5.0 kg / m 2 ; S5. 24 hours after laying the high-viscosity modified asphalt gravel bonding layer 4, lay the black thermochromic asphalt SMA top layer 5 above it, Specifically: For the black thermochromic asphalt SMA top layer 5, the nominal maximum particle size is 9.5 mm. The initial gradation is by weight ratio, the passing rate of sieve hole 13.2 mm is 90% - 100%, the passing rate of sieve hole 9.5 mm is 50% - 75%, the passing rate of sieve hole 4.75 mm is 20 - 34%, the passing rate of sieve hole 2.36 mm is 15 - 26%, the passing rate of sieve hole 1.18 mm is 14 - 24%, the passing rate of sieve hole 0.6 mm is 12 - 20%, the passing rate of sieve hole 0.3 mm is 10 - 16%, the passing rate of sieve hole 0.15 mm is 9 - 15%, the passing rate of sieve hole 0.075 mm is 8 - 12%. 24 hours after laying the high-viscosity modified asphalt gravel bonding layer 4, construct the black thermochromic asphalt SMA top layer 5, and the thickness is 40 mm.

[0031] In step S1, the standards for shot blasting and derusting of the steel bridge deck 1 are as follows: for machine grinding and derusting, the cleanliness reaches Sa2.5 level and the roughness reaches 80 - 120μm; for manual grinding and derusting, the cleanliness reaches St3.0 level and the roughness reaches 30 - 70μm.

[0032] In step S4, before laying the high - adhesive modified asphalt gravel bonding layer 4, the top surface of the cold - mix resin asphalt mixture RA lower layer 3 is milled, and the milling depth is 3 - 5mm.

[0033] The cold - mix resin asphalt gravel waterproof bonding layer 2 in the present invention can be constructed at normal temperature, and can form a relatively large strength in a short time. It has good bonding performance, and the scattered gravel can further prevent the paving layer from slipping.

[0034] The cold - mix resin asphalt mixture RA lower layer 3 in the present invention can be constructed at normal temperature, quickly form strength, and has excellent high - and low - temperature performance, small void ratio, good waterproof performance, and thin thickness, which can reduce the dead load of the bridge.

[0035] The high - adhesive modified asphalt gravel bonding layer 4 in the present invention improves the bonding performance between the upper layer and the lower layer, and the scattered gravel can further prevent the paving layer from slipping.

[0036] The black thermochromic asphalt SMA upper layer 5 in the present invention has a gradation of a framework - interlocked dense structure and excellent high - temperature performance. The added rubber can replace the commonly used basalt fiber and lignin fiber, has a better oil - fixing and oil - absorbing effect, and effectively improves the road - using performance of the mixture. The thermochromic asphalt prepared by adding thermochromic materials to the high - adhesive modified asphalt can actively change the color depth and reflectivity according to the ambient temperature, thus effectively reducing the temperature of the asphalt pavement in summer, reducing diseases related to high temperature, and similarly delaying the temperature drop in winter, which is beneficial to delaying road icing.

[0037] Different from the double - layer SMA paving system, epoxy paving system and cast - in - place asphalt concrete paving system, the construction method of the paving structure of the present invention is simple in process, low in material cost, can be used after oxidation for a short time, and is suitable for the construction and maintenance of long - span steel bridge deck paving.

[0038] The above - mentioned are only the preferred embodiments of the present invention, and do not impose any other form of limitation on the present invention. Any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope protected by the present invention.

Claims

1. A bridge deck paving structure applicable to long-span steel bridges, characterized in that, It includes a steel bridge deck (1), a cold-mixed resin asphalt gravel waterproof bonding layer (2), a cold-mixed resin asphalt mixture RA bottom layer (3), a high-rubber modified asphalt gravel bonding layer (4), and a black thermochromic asphalt SMA top layer (5) arranged successively from bottom to top; The cold-mixed resin asphalt gravel waterproof bonding layer (2) includes resin asphalt and gravel with a particle size of 3-5 mm evenly distributed on the resin asphalt. The coating amount of the resin asphalt on the steel bridge deck (1) is 0.9-1.1 kg / m 2 , and the spreading amount of the gravel is 2.5-4.5 kg / m 2 ; The cold-mixed resin asphalt mixture RA bottom layer (3) is cold-mixed resin asphalt mixture RA05 with a thickness of 25 mm; The high-viscosity modified asphalt gravel bonding layer (4) comprises high-viscosity modified asphalt and gravel with a particle size of 10 - 13 mm evenly distributed on the high-viscosity modified asphalt. The coating amount of the high-viscosity modified asphalt on the cold-mixed resin asphalt mixture RA lower layer (3) is 0.8 - 1.0 kg / m 2 , and the spreading amount of the gravel is 3.0 - 5.0 kg / m 2 ; The black thermochromic asphalt SMA top layer (5) is black thermochromic asphalt SMA-13 with a thickness of 40 mm.

2. The deck paving structure for long-span steel bridges according to claim 1, characterized in that The resin asphalt is composed of the following raw material components and weight percentages: 40% of epoxy resin, 40% of petroleum asphalt, and 20% of modified amine curing agent.

3. The deck paving structure for long-span steel bridges according to claim 2, wherein, The modified amine curing agent is methylene diphenylamine or polyethylenepolyamine.

4. The deck paving structure for long-span steel bridges according to claim 1, wherein For the cold-mixed resin asphalt mixture RA05, the nominal maximum particle size of the grading is 4.75 mm. By weight ratio, the passing rate of the sieve hole 4.75 mm is greater than 95%, the passing rate of the sieve hole 4.75 mm is 90 - 100%, the passing rate of the sieve hole 2.36 mm is 55 - 72%, the passing rate of the sieve hole 1.18 mm is 35 - 55%, the passing rate of the sieve hole 0.6 mm is 25 - 43%, the passing rate of the sieve hole 0.3 mm is 16 - 30%, the passing rate of the sieve hole 0.15 mm is 12 - 22%, and the passing rate of the sieve hole 0.075 mm is 8 - 16%; The cold-mixed resin asphalt mixture RA05 is designed for the mix ratio by the Marshall test method, and the asphalt-aggregate ratio is 6.0% - 8.0%.

5. The deck pavement structure for long-span steel bridges according to claim 1, characterized in that, For the black thermochromic asphalt SMA-13, the nominal maximum particle size is 9.5 mm. For the initial grading, by weight ratio, the passing rate of the sieve hole 13.2 mm is 90% - 100%, the passing rate of the sieve hole 9.5 mm is 50% - 75%, the passing rate of the sieve hole 4.75 mm is 20 - 34%, the passing rate of the sieve hole 2.36 mm is 15 - 26%, the passing rate of the sieve hole 1.18 mm is 14 - 24%, the passing rate of the sieve hole 0.6 mm is 12 - 20%, the passing rate of the sieve hole 0.3 mm is 10 - 16%, the passing rate of the sieve hole 0.15 mm is 9 - 15%, and the passing rate of the sieve hole 0.075 mm is 8 - 12%; The black thermochromic asphalt SMA-13 is incorporated into the high-rubber modified asphalt to prepare the black thermochromic asphalt SMA top layer (5) at a mass ratio of 3% - 6%, and the mix ratio is designed by the Marshall test method, and the asphalt-aggregate ratio is 5.0% - 6.0%.

6. The deck paving structure for long-span steel bridges according to claim 1, wherein The high-rubber modified asphalt is SBS modified asphalt prepared by incorporating 15% of rubber masterbatch powder.

7. The deck paving structure for long-span steel bridges according to claim 5, characterized in that The black thermochromic asphalt SMA-13 is composed of three parts: a leuco dye, a developer, and a solvent. The leuco dye is triarylmethane, diallyl phthalate, or propyl methanol; the developer is phenol, hydroxy acid, sulfonic acid, or metal salt; the solvent is alcohol, mercaptan, ketone ether, phosphate ester, or carbonate ester. The leuco dye, developer, and solvent are microencapsulated to prepare a solid material with a particle size of 3 - 5 nm.

8. A bridge deck paving method applicable to long-span steel bridges according to any one of claims 1-7, characterized in that, It includes the following steps: S1. Sandblasting and rust removal on the steel bridge deck (1); S2. Laying the cold-mixed resin asphalt gravel waterproof bonding layer (2) above the steel bridge deck (1); S3. Lay a cold-mixed resin asphalt mixture RA bottom layer (3) above the cold-mixed resin asphalt gravel waterproof bonding layer (2); S4. Lay a high-gel modified asphalt gravel bonding layer (4) above the cold-mixed resin asphalt mixture RA bottom layer (3); S5. 24 hours after laying the high-gel modified asphalt gravel bonding layer (4), lay a black thermochromic asphalt SMA top layer (5) above it.

9. A bridge deck paving method applicable to long-span steel bridges according to claim 8, characterized in that, In step S1, the standards for shot blasting and rust removal of the steel bridge deck (1) are as follows: for machine grinding and rust removal, the cleanliness reaches Sa2.5 level and the roughness reaches 80 - 120μm; for manual grinding and rust removal, the cleanliness reaches St3.0 level and the roughness reaches 30 - 70μm.

10. A bridge deck paving method applicable to long-span steel bridges according to claim 8, characterized in that, In step S4, before laying the high-gel modified asphalt gravel bonding layer (4), perform surface milling on the cold-mixed resin asphalt mixture RA bottom layer (3), and the milling depth is 3 - 5mm.

Images