Steel bridge deck combined pavement structure with high strength and corrosion resistance and construction method thereof

Abstract

The invention discloses a steel bridge deck combined pavement structure with high strength and corrosion resistance and a construction method thereof. The steel bridge deck combined pavement structure sequentially comprises a steel panel base layer, a middle pavement layer, a bonding layer and a wearing layer, wherein the middle pavement layer is formed by basalt chopped fiber UHPC and basalt fiber composite material grid ribs; the middle pavement layer is obtained by casting basalt chopped fiber UHPC on site, and meanwhile, the basalt fiber composite material grid ribs are arranged in the UHPC. On the premise that the overall thickness of the steel bridge deck combined pavement structure is effectively reduced, the overall corrosion resistance and strength of the steel bridge deck combined pavement structure can be greatly improved.

Description

Technical Field

[0001] The present invention relates to a steel bridge deck composite pavement structure of basalt chopped structural fiber reinforced UHPC+basalt fiber composite mesh reinforcement, and also relates to a construction method of the steel bridge deck composite pavement structure. Background Art

[0002] From the perspective of use, the steel bridge deck pavement is prone to defects such as peeling, shifting, cracking, and potholes due to the influence of long-term traffic loads and temperature factors, which directly affect driving safety. In recent years, UHPC has been developed to replace the traditional bridge deck scheme that combines ordinary reinforced concrete and steel bridge decks. This structure has high strength and can reduce the risk of fatigue cracking of steel bridge decks and extend the fatigue life of steel bridge decks. However, the UHPC steel bridge deck pavement is susceptible to corrosion due to the influence of rain, ice and snow all year round, thereby reducing the durability of the bridge deck structure. Therefore, the current conventional steel bridge deck-UHPC lightweight combination bridge deck has the disadvantages of large steel material consumption, high cost and corrosion resistance. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a steel bridge deck composite pavement structure with high strength and corrosion resistance. The composite pavement structure is cast on-site using basalt short-cut structural fiber-reinforced UHPC, and basalt fiber composite mesh bars are arranged in the UHPC, which can effectively improve the strength and corrosion resistance of the composite pavement structure. Another purpose of the present invention is to provide a construction method for the above-mentioned composite pavement structure.

[0004] Technical solution: The steel bridge deck composite pavement structure described in the present invention includes, in sequence, a steel panel base layer (including studs), an intermediate pavement layer formed by basalt short-cut structural fiber UHPC and basalt fiber composite mesh reinforcement, a bonding layer, and a wear layer.

[0005] In the steel bridge deck composite pavement structure of the present invention, basalt fiber composite mesh reinforcement is laid in the middle of the bolts on the steel panel base to replace the ordinary steel bars in the traditional pavement layer, effectively improving the mechanical properties, crack resistance and durability of the pavement layer structure.

[0006] Among them, the total thickness of the steel bridge deck composite pavement structure is 97 to 111 mm; the steel panel base is a steel panel base with welded studs; the thickness of the steel panel base is 12 to 16 mm; the height of the studs is 35 to 40 mm, and the diameter of the studs is 10 to 13 mm; the middle pavement layer is cast by using basalt short-cut structural fiber UHPC, and basalt fiber composite mesh bars are arranged in the UHPC; the thickness of the middle pavement layer is 40 to 45 mm; the bonding layer is an epoxy resin adhesive layer; the thickness of the bonding layer is 5 to 10 mm; the wearing layer is an ARAC-13 rubber asphalt concrete wearing layer; the thickness of the wearing layer is 40 to 45 mm.

[0007] The basalt short structural fiber UHPC is composed of the following components in parts by mass: 750-800 parts of silicate cement, 150-200 parts of silica fume, 700-800 parts of quartz sand, 50-70 parts of basalt short structural fiber, 150-200 parts of water, and 15-20 parts of a water reducer. The basalt short structural fiber UHPC is prepared by the following method: first, a formula amount of silicate cement, silica fume, quartz sand, and a water reducer are mixed, and after mixing, stirred for 1-2 minutes, and then a formula amount of water is added thereto, wet-mixed and stirred until the mixture approaches the target fluidity, and then the basalt short structural fiber is slowly added. After all the fibers are added, stirring is continued for at least 2 minutes until the fibers are evenly dispersed in the mixture, thereby obtaining the basalt short structural fiber UHPC.

[0008] The construction method of the steel bridge deck composite pavement structure comprises the following steps:

[0009] (1) Weld the studs to the steel panel base at equal intervals in a plum blossom pattern, with the spacing between adjacent studs being 150 to 200 mm;

[0010] (2) Lay basalt fiber composite mesh reinforcement in the middle of the bolts on the steel panel base, and support it under the mesh reinforcement with concrete pads. The thickness of the protective layer is 15 to 20 mm.

[0011] (3) Casting basalt chopped structural fiber UHPC, after casting, tap the side form with a rubber hammer to remove bubbles; and perform moisture maintenance on the concrete;

[0012] (4) After moisturizing and curing, the concrete surface is roughened by sandblasting, then coated with epoxy resin glue, and finally laid with ARAC-13 fine-grained asphalt concrete wearing layer; thus, a steel bridge deck composite pavement structure is obtained.

[0013] In the steel bridge deck composite pavement structure of the present invention, the steel panel base layer is a steel panel base layer with welded studs, the middle pavement layer adopts a combination of "basalt short-cut structural fiber UHPC + basalt fiber composite mesh reinforcement", and the surface pavement adopts a bonding layer (epoxy adhesive) and ARAC-13 rubber asphalt; after the basalt short-cut structural fiber UHPC is cast and formed, the concrete surface is sandblasted and roughened after on-site moisturizing curing or high-temperature steam curing, and then epoxy resin glue is applied, and finally an ARAC-13 asphalt concrete wearing layer is laid.

[0014] The basalt fiber composite mesh reinforcement of this invention is a grid-like composite material produced by integrating continuous basalt fibers and a matrix material (such as epoxy resin) through a compression molding or vacuum-assisted molding process. It exhibits high strength, high elongation, electrical insulation, and excellent long-term corrosion resistance, fatigue resistance, and creep rupture resistance. Compared to traditional steel mesh, the basalt fiber composite mesh reinforcement fully utilizes the corrosion resistance of the basalt material and the high tensile strength of the basalt fiber composite material, significantly improving the corrosion and crack resistance of steel bridge deck composite pavement structures, thereby extending the service life of the steel bridge deck composite pavement structure.

[0015] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: (1) Compared with the traditional ordinary reinforced concrete steel bridge deck pavement layer, the present invention can reduce the pavement layer thickness, while reducing the weight of the structure, it can also improve the overall strength of the UHPC pavement layer. (2) Compared with the conventional steel fiber reinforced UHPC steel bridge deck pavement layer, the present invention uses basalt short-cut structural fibers and basalt fiber composite mesh bars to replace steel fibers and ordinary steel mesh respectively, giving full play to the corrosion resistance of basalt materials and the high tensile strength of basalt fiber composite materials. At the same time, the basalt material itself has electrical insulation properties, avoiding the electrochemical corrosion of traditional steel materials during use, greatly improving the corrosion resistance and mechanical properties of the bridge deck pavement, and improving the durability and life of the bridge deck. (3) Compared with the traditional orthotropic steel bridge deck + asphalt pavement, the combined pavement structure of the present invention greatly improves the overall stiffness of the bridge deck, fundamentally solving the fatigue failure problem of orthotropic steel bridge decks and increasing the service life of the steel bridge deck. At the same time, it can also reduce the thickness of the bridge deck steel plate and the arrangement of U-shaped stiffening ribs, thereby reducing the amount of steel used. (4) The present invention uses chopped basalt structural fibers instead of traditional steel fibers. Since the material density is basically the same as that of concrete, it can be evenly dispersed during the construction mixing process, with good mixing performance, and will not produce the disadvantage of steel fibers agglomerating and sinking during the mixing process, which will lead to reduced structural performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural principle diagram of the steel bridge deck combined pavement structure of the present invention;

[0017] Figure 2 This is a top view of the structure of basalt fiber composite mesh reinforcement. DETAILED DESCRIPTION

[0018] Example 1

[0019] The steel bridge deck composite pavement structure of the present invention comprises, from bottom to top, a steel panel base layer 1, an intermediate pavement layer 2 composed of basalt short-cut structural fiber UHPC and basalt fiber composite mesh reinforcement, an epoxy resin bonding layer 3 and an ARAC-13 rubber asphalt concrete wearing layer 4.

[0020] The above-mentioned steel bridge deck composite pavement structure is constructed by the following methods, specifically:

[0021] (1) After the steel panels are assembled, the bolts are welded to the steel panels at equal intervals in a plum blossom pattern, ensuring a spacing of 150 mm; the steel panel base is shot blasted and cleaned;

[0022] (2) Lay basalt fiber composite mesh reinforcement at the middle position of the bolts on the steel panel base (the middle position in the height direction), and support it with concrete pads under the mesh reinforcement to ensure that the thickness of the protective layer reaches 15 mm. The dimensions of the basalt fiber composite mesh reinforcement are shown in Table 1. The mechanical properties of the basalt fiber composite mesh reinforcement are shown in Table 2.

[0023] Table 1

[0024] Width (m) Mesh size (mm*mm) Thickness (mm) <![CDATA[Density (g / cm 3 )]]> 1.5 50*50 3 2.1

[0025] Table 2

[0026]

[0027] (3) According to mass, 750 parts of silicate cement, 150 parts of silica fume, 700 parts of quartz sand, 50 parts of basalt short-cut structural fiber, 150 parts of water and 15 parts of water reducer were weighed and stirred in a forced mixer. During stirring, the dry mix should be pre-dry mixed for 1-2 minutes, then wet mixed with water, and then mixed and stirred until the mixture is close to the target fluidity. Then, basalt short-cut structural fiber was slowly added. After all the fibers were added, stirring was continued for not less than 2 minutes until the fibers were evenly dispersed in the mixture to obtain basalt short-cut structural fiber UHPC. The performance parameters of basalt short-cut structural fiber are shown in Table 3:

[0028] Table 3

[0029]

[0030] (4) When pouring basalt chopped structural fiber UHPC, it is advisable to pour from one side of the test mold and complete the pouring in one go. After pouring, the side mold can be tapped with a rubber hammer to remove bubbles. After the concrete is moisturized and cured for 1 day, it is roughened and then covered and moisturized for 28 days.

[0031] (5) After conventional moisturizing curing or high-temperature steam curing, the concrete surface is roughened by sandblasting, then coated with epoxy resin glue, and finally laid with ARAC-13 fine-grained asphalt concrete wearing layer; thus, a steel bridge deck composite pavement structure is obtained.

[0032] The thickness of the steel bridge deck composite pavement structure obtained in Example 1 (excluding the steel panel base, the thickness of the steel panel base is 12 mm, and the stud height is 35 mm) is 85 mm; the thickness of the intermediate pavement layer 2 is 40 mm; the thickness of the adhesive layer 3 is 5 mm; and the thickness of the wear layer 4 is 40 mm.

[0033] The performance of the steel bridge deck composite pavement structure obtained in Example 1 is shown in Figure 4.

[0034] Table 4

[0035]

[0036] Example 2

[0037] The steel bridge deck composite pavement structure of the present invention comprises, from bottom to top, a steel panel base layer 1, an intermediate pavement layer 2 composed of basalt short-cut structural fiber UHPC and basalt fiber composite mesh reinforcement, an epoxy resin bonding layer 3 and an ARAC-13 rubber asphalt concrete wearing layer 4.

[0038] The above-mentioned steel bridge deck composite pavement structure is constructed by the following methods, specifically:

[0039] (1) After the steel panels are assembled, the bolts are welded to the steel panels at equal intervals in a plum blossom pattern, ensuring a spacing of 150 mm; the steel panel base is shot blasted and cleaned;

[0040] (2) Lay basalt fiber composite mesh reinforcement on the steel panel base, and support it with concrete pads underneath to ensure that the thickness of the protective layer reaches 15 mm. The dimensions of the basalt fiber composite mesh reinforcement are shown in Table 5. The mechanical properties of the basalt fiber composite mesh reinforcement are shown in Table 6.

[0041] Table 5

[0042] Width (m) Mesh size (mm*mm) Thickness (mm) <![CDATA[Density (g / cm 3 )]]> 1.5 50*50 3 2.1

[0043] Table 6

[0044]

[0045] (3) Weigh 800 parts of silicate cement, 200 parts of silica fume, 800 parts of quartz sand, 70 parts of basalt short-cut structural fiber, 200 parts of water and 20 parts of water reducer in parts by mass; use a forced mixer to stir, and when stirring, it is advisable to pre-dry mix the dry mix for 1-2 minutes, then add water for wet mixing, and mix and stir after wet mixing. The wet mixing test piece should not be less than 5 minutes, until the mixture is close to the target fluidity, and then slowly add the fiber. After all the fibers are added, continue stirring for not less than 2 minutes until the fibers are evenly dispersed in the mixture to obtain basalt short-cut structural fiber UHPC; the performance parameters of the basalt short-cut structural fiber used in Example 2 are the same as those in Example 1;

[0046] (4) When pouring basalt chopped structural fiber UHPC, it is advisable to pour from one side of the test mold and complete the pouring in one go. After pouring, the side mold can be tapped with a rubber hammer to remove bubbles. After the concrete is moisturized and cured for 1 day, it is roughened and then covered and moisturized for 28 days.

[0047] (5) After moisturizing and curing, the concrete surface is roughened by sandblasting, then coated with epoxy resin glue, and finally laid with ARAC-13 fine-grained asphalt concrete wearing layer; thus, a steel bridge deck composite pavement structure is obtained.

[0048] The thickness of the steel bridge deck composite pavement structure obtained in Example 2 (excluding the steel panel base, the thickness of the steel panel base is 12 mm, and the stud height is 40 mm) is 95 mm; the thickness of the intermediate pavement layer 2 is 45 mm; the thickness of the adhesive layer 3 is 5 mm; and the thickness of the wear layer 4 is 45 mm.

[0049] The performance of the steel bridge deck composite pavement structure obtained in Example 2 is shown in Table 7.

[0050] Table 7

[0051]

Claims

1. A high-strength and corrosion-resistant steel bridge deck composite pavement structure, characterized by: It comprises, in sequence, a steel panel base layer (1), an intermediate paving layer (2) formed by basalt short-cut structural fiber UHPC and basalt fiber composite material grid reinforcement, a bonding layer (3) and a wearing layer (4).

2. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 1 is characterized in that: The total thickness of the steel bridge deck combined pavement structure is 97 to 111 mm.

3. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 2 is characterized in that: The steel panel base layer (1) is a steel panel base layer with welded studs; the thickness of the steel panel base layer (1) is 12 to 16 mm.

4. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 3 is characterized in that: The height of the stud (5) is 35-40 mm, and the diameter of the stud (5) is 10-13 mm.

5. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 2 is characterized in that: The middle pavement layer (2) is cast by using basalt short-cut structural fiber UHPC, and basalt fiber composite material grid bars are arranged in the UHPC; the thickness of the middle pavement layer (2) is 40-45 mm.

6. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 5 is characterized in that: The basalt short-cut structural fiber UHPC is composed of the following components in parts by mass: 750-800 parts of silicate cement, 150-200 parts of silica fume, 700-800 parts of quartz sand, 50-70 parts of basalt short-cut structural fiber, 150-200 parts of water and 15-20 parts of water reducer.

7. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 6, characterized in that: The basalt short-strength structural fiber UHPC is prepared by the following method: first, a formula amount of silicate cement, silica fume, quartz sand and a water reducer are mixed, and the mixture is stirred for 1 to 2 minutes. Then, a formula amount of water is added thereto, and wet mixing is stirred until the mixture approaches the target fluidity. Then, the basalt short-strength structural fiber is slowly added. After all the fibers are added, stirring is continued for at least 2 minutes until the fibers are evenly dispersed in the mixture, thereby obtaining the basalt short-strength structural fiber UHPC.

8. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 2, characterized in that: The bonding layer (3) is an epoxy resin bonding agent layer; the thickness of the bonding layer (3) is 5 to 10 mm.

9. The high-strength and corrosion-resistant steel bridge deck composite pavement structure according to claim 2, characterized in that: The wearing layer (4) is an ARAC-13 rubber asphalt concrete wearing layer; the thickness of the wearing layer (4) is 40 to 45 mm.

10. The construction method of the steel bridge deck composite pavement structure according to claim 1, characterized in that: The steps include: (1) Weld the studs to the steel panel base at equal intervals in a plum blossom pattern, with the spacing between adjacent studs being 150 to 200 mm; (2) Lay basalt fiber composite mesh reinforcement in the middle of the bolts on the steel panel base, and support it under the mesh reinforcement with concrete pads. The thickness of the protective layer is 15 to 20 mm. (3) Casting basalt chopped structural fiber UHPC, after casting, use a rubber hammer to knock out bubbles; and perform moisture maintenance on the concrete; (4) After moisturizing and curing, the concrete surface is roughened by sandblasting, then coated with epoxy resin glue, and finally laid with ARAC-13 fine-grained asphalt concrete wearing layer; thus, a steel bridge deck composite pavement structure is obtained.

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