Steel bridge deck pavement modified resin concrete and pavement structure thereof

Abstract

The invention discloses steel bridge deck pavement modified resin concrete and a pavement structure thereof, and belongs to the technical field of concrete preparation. The concrete is composed of a modified resin cementing material and aggregate, the modified resin cementing material consists of a main agent, a curing agent and an auxiliary agent; the main agent is modified bisphenol epoxy resin; the curing agent consists of a polyether amine curing agent, a modified phenolic aldehyde amine curing agent, an alicyclic amine curing agent, a curing accelerator and nano silicon dioxide; the aggregate is a compound of dried stone, filler, fiber and elastic particles; the auxiliary agent is composed of a defoaming agent, a flatting agent and an ultraviolet light absorber; the mass ratio of the main agent to the curing agent to the auxiliary agent is (50-110): (40-100): (1-3), and the mass of the modified resin cementing material accounts for 6-18% of the mass of the aggregate. The modified resin concrete is high in compressive strength and excellent in fatigue performance, and compared with common concrete, the modified resin concrete has higher strength and toughness and can bear larger load and impact force.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete preparation, and particularly relates to a modified resin concrete for steel bridge deck paving and its paving structure. Background Art

[0002] With the development of modern society, bridges have become an essential part of connecting cities. Especially in mountainous areas, the erected bridges provide great convenience. The quality of the bridge deck directly affects the driving safety and the comfort of drivers and passengers. At present, the highway bridges in China are mainly reinforced concrete bridges, and their bridge deck pavements generally use cement concrete. However, this paving method has significant drawbacks: 1. The structural design and material technical parameters of the paving layer are unreasonable, and the stress and deformation complexity of the steel bridge deck paving under the influence of factors such as vehicle load, wind load, temperature change, and earthquake are not fully considered, resulting in diseases such as cracks and ruts in the paving layer. 2. The waterproof bonding layer paving system is not perfect enough, and the bonding performance and durability of some materials are insufficient, making it difficult to effectively prevent water penetration, thus causing problems such as delamination, slip between the paving layer and the steel bridge deck, and corrosion of the steel plate. 3. When epoxy asphalt steel bridge deck paving is carried out in blocks and layers, the sawing method and position selection of the construction joints are unreasonable. Under the conditions of heavy load and large traffic volume during operation, the local impact of the wheels is likely to cause damage to these weak areas.

[0003] In addition, in the exploration of new materials, although bridge material R & D experts have introduced resin concrete for bridge deck paving, this technology still faces many challenges. To ensure good mixing of the cementing material and the aggregate, monomers or prepolymers are currently mostly used in mixing, which results in a large amount of monomers and curing agents during on-site mixing, posing serious safety hazards. Even if the safety problems can be solved, the existing resin materials also have defects such as weak impact resistance and poor ultraviolet light aging resistance, making the prepared resin concrete difficult to meet the high mechanical properties and anti-aging requirements of bridge deck paving, and it is only suitable for low-mechanical-property and light-shielded application scenarios such as drainage channels, and cannot be widely used in the field of bridge paving. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a modified resin concrete for steel bridge deck paving and its paving structure to solve the problems of poor toughness, easy cracking, and poor durability of the resin concrete for steel bridge deck paving at present.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a modified resin concrete for steel bridge deck paving. The concrete is composed of a modified resin binder and aggregates. The modified resin binder is composed of a main agent, a curing agent, and an auxiliary agent. The main agent is a modified bisphenol epoxy resin. The curing agent is composed of a polyetheramine curing agent, a modified phenolic amine curing agent, an alicyclic amine curing agent, a curing accelerator, and nano-silica. The aggregates are a composite of dried stone, filler, fiber, and elastic particles. The auxiliary agent is composed of an antifoaming agent, a leveling agent, and an ultraviolet absorber.

[0007] The mass ratio of the main agent, the curing agent, and the auxiliary agent is 50-110:40-100:1-3, and the mass of the modified resin binder accounts for 6-18% of the mass of the aggregates.

[0008] The modification steps of the bisphenol epoxy resin are as follows:

[0009] P1. After mixing carboxyl-terminated hyperbranched polyester and hydroxylated graphene, add dimethylformamide solvent and disperse by ultrasonic wave, then raise the temperature and continue stirring reaction. After the reaction is completed, remove the excess dimethylformamide to obtain hyperbranched polyester grafted graphene.

[0010] P2. At room temperature, mix bisphenol epoxy resin, active diluent, and polyurethane prepolymer evenly according to the weight ratio of 100:5-15:3-10 to obtain a composite epoxy resin.

[0011] P3. At room temperature, mix the composite epoxy resin, ultrafine fully vulcanized powder rubber, and hyperbranched polyester grafted graphene evenly according to the weight ratio of 100:2-15:0.1-0.5, and then disperse them successively by ultrasonic wave and high-speed shear machine. After uniform dispersion, nano-material modified epoxy resin can be obtained.

[0012] Furthermore, the bisphenol epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and hydrogenated bisphenol A epoxy resin. The active diluent is at least one of allyl glycidyl ether, n-butyl glycidyl ether, phenyl glycidyl ether, and tolyl glycidyl ether.

[0013] Furthermore, the ultrafine fully vulcanized powder rubber is ultrafine fully vulcanized carboxylated nitrile powder rubber, and its particle size is 88-92nm.

[0014] Furthermore, the weight ratio of the polyetheramine curing agent, the modified phenolic amine curing agent, the alicyclic amine curing agent, the curing accelerator, and nano-silica is 80-100:30-50:3-8:2-6:0.1-0.5.

[0015] The polyetheramine curing agent is at least one of D-230, D-400, and D-2000.

[0016] The modified phenolic amine curing agent is a compound formed by the Mannich reaction of phenol, aldehyde and amine, where the phenol is a mixture of cardanol and styrenated phenol with a mass ratio of 1:1; the aldehyde is trioxymethylene; the amine is at least one of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and divinylpropylamine;

[0017] The alicyclic amine curing agent is at least one of N-aminoethylpiperazine, isophorone diamine, and bis(4-amino-3-methylcyclohexyl)methane; the curing accelerator is at least one of 2,4,6-tris(dimethylaminomethyl)phenol, tertiary amine accelerators, and quaternary ammonium salt accelerators.

[0018] Further, the mass ratio of stone, filler, fiber, and elastic particle composite in the aggregate is 100:2 - 8:0.2 - 0.5:0.5 - 1.5;

[0019] The stone is basalt, and the proportion of basalt with a particle size of 0 - 5mm and 5 - 10mm is 60 - 80:20 - 40;

[0020] The fiber is at least one of basalt fiber, polypropylene fiber, polyacrylonitrile fiber, and polyimide fiber; the filler is limestone powder; the elastic particle is a rubber particle with a mesh size of 40 - 80.

[0021] Further, when modifying the bisphenol epoxy resin, in step P1, after adding the dimethylformamide solvent, it is ultrasonically dispersed at 60°C for 2h, the temperature after heating is 120°C, and the stirring reaction time is 36h;

[0022] In step P3, the rotation speed of the high-speed shearer is 500 - 1000 r / min.

[0023] Further, a preparation method of modified resin concrete for steel bridge deck paving includes the following steps,

[0024] S1. Prepare the main agent and curing agent of the modified resin binder respectively;

[0025] S2. Mix the stone, filler, fiber, and elastic particles evenly according to the ratio to obtain the aggregate, and then place the aggregate in an oven at 105 - 110°C for 2 - 3h to dry, remove the moisture and then cool to room temperature;

[0026] S3. Mix the main agent and curing agent evenly, add the auxiliary agent and mix evenly again to obtain the modified resin binder;

[0027] S4. Mix the aggregate and the modified resin binder evenly by stirring to obtain the modified resin concrete for steel bridge deck paving.

[0028] Furthermore, a modified resin concrete for steel bridge deck pavement is provided with a steel bridge deck pavement structure, which is composed of a steel plate, an anti-corrosion layer, a waterproof bonding layer, a lower pavement layer, an interlayer bonding layer, and an upper pavement layer from bottom to top in sequence;

[0029] Both the upper layer and the lower layer adopt modified resin concrete. Among them, the cement-aggregate ratio of the modified resin concrete used in the upper layer is 6-12%, and the thickness is 2.0-4.0 cm; the cement-aggregate ratio of the modified resin concrete used in the lower layer is 12-18%, and the thickness is 1.5-3.5 cm;

[0030] The anti-corrosion layer adopts epoxy zinc-rich paint;

[0031] The waterproof bonding layer adopts a modified resin binder, and the dosage is 0.3-0.5 kg / m 2 ;

[0032] The interlayer bonding layer is composed of a modified resin binder and 2-3 mm basalt gravel. Among them, the dosage of the interlayer binder is 0.6-1.2 kg / m 2 The dosage of 2-3 mm basalt gravel is 3.0-6.0 kg / m 2 。

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. In the present invention, bisphenol epoxy resin is used as the base resin, which has good mechanical properties and bonding properties and is an important raw material for preparing high-performance resin concrete; the urethane groups in the polyurethane prepolymer react with the epoxy groups in the epoxy resin to form a polymer with an interpenetrating network structure. This structure not only retains the high strength and bonding property of the epoxy resin but also endows the concrete with good toughness and impact resistance; ultrafine fully vulcanized powder rubber, hyperbranched polyester grafted graphene, and nano-silica can be evenly dispersed in the resin matrix to form a dense nano-structure, which can improve the microstructure of the concrete and enhance its strength, toughness, and durability; the compound curing system can enable the concrete to cure rapidly in different environments while ensuring the properties after curing.

[0035] 2. The lower layer of the modified resin concrete pavement structure of the present invention has good fluidity and can be directly laid by relying on its own fluidity without heating and mixing, which is convenient and fast in construction and has excellent waterproof performance and co-deformation ability; the upper layer has good wear resistance and anti-skid performance. The entire pavement structure has excellent high-temperature performance, interfacial bonding performance, and anti-fatigue performance and can be effectively applied to long-span steel bridge deck pavements.

[0036] 3. The raw materials selected in the present invention are all environmentally friendly materials, and no harmful substances are released during the production process, which is harmless to the environment and human health and meets the development requirements of green building materials.

[0037] Other advantages, objectives and features of the present invention will be set forth in the subsequent description, and to some extent will be obvious to those skilled in the art, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to make the objectives, technical solutions and beneficial effects of the invention clearer, the present invention provides the following drawings for illustration:

[0039] Figure 1 It is the preparation flow chart of the modified resin concrete of the present invention;

[0040] Figure 2 It is the schematic diagram of the layer between the paving structures of the present invention.

[0041] The labels in the drawings are as follows: 1, steel plate; 2, anti-corrosion layer; 3, waterproof bonding layer; 4, lower paving layer; 5, interlayer bonding layer; 6, upper paving layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] As Figure 1-2 shown, the present invention provides a preparation method of modified resin concrete for steel bridge deck paving and its paving structure.

[0043] When preparing the modified resin concrete of the present invention, it is necessary to first modify bisphenol epoxy resin:

[0044] P1. Put the carboxyl-terminated hyperbranched polyester and hydroxylated graphene into a flask and mix them. Then add dimethylformamide solvent and ultrasonically disperse for 2 h at 60 °C, and then raise the temperature to 120 °C and stir and react for 36 h. After the reaction is completed, remove the excess dimethylformamide to obtain hyperbranched polyester grafted graphene;

[0045] P2. At room temperature, mix bisphenol epoxy resin (a mixture of bisphenol A epoxy resin and bisphenol S epoxy resin), active diluent (allyl glycidyl ether), and polyurethane prepolymer evenly according to a weight ratio of 100:10:7 to obtain a composite epoxy resin;

[0046] P3. At room temperature, mix the composite epoxy resin, ultrafine fully vulcanized powder rubber (ultrafine fully vulcanized carboxylated nitrile butadiene powder rubber with a particle size of 90 nm) and hyperbranched polyester grafted graphene evenly according to a weight ratio of 100:8:0.3, and then disperse them in turn by ultrasonic and high-speed shear machine. After uniform dispersion, nano-material modified bisphenol epoxy resin can be obtained.

[0047] Example 1

[0048] S1. Add polyetheramine curing agent, modified phenolic amine curing agent, alicyclic amine curing agent, curing accelerator (2,4,6-tris(dimethylaminomethyl)phenol) and nano-silica to form a curing agent in a weight ratio of 80:40:8:3:0.1;

[0049] S2. Mix stone materials (composed of 5mm basalt and 8mm basalt with a weight ratio of 60:40), filler (limestone powder), fibers (composed of polypropylene fiber and polyimide fiber with a weight ratio of 1:1), and 60-mesh rubber particles in a weight ratio of 100:6:0.2:1.5 to form aggregate. Then place the aggregate in an oven at 80 °C for 2.5 h to remove moisture, and then cool it to room temperature;

[0050] S3. Mix the modified bisphenol epoxy resin and the curing agent evenly, add additives (composed of defoaming agent, leveling agent, and ultraviolet absorber with a weight ratio of 1:1:1), and then mix evenly again to obtain a modified resin binder;

[0051] S4. Mix the aggregate and the modified resin binder evenly, and then the modified resin concrete for steel bridge deck paving is obtained.

[0052] Example 2

[0053] S1. Add polyetheramine curing agent, modified phenolic amine curing agent, alicyclic amine curing agent, curing accelerator (2,4,6-tris(dimethylaminomethyl)phenol) and nano-silica to form a curing agent in a weight ratio of 100:30:4:6:0.45;

[0054] S2. Mix stone materials (composed of 5mm basalt and 8mm basalt with a weight ratio of 80:25), filler (limestone powder), fibers (composed of polypropylene fiber and polyimide fiber with a weight ratio of 0.5:1.2), and 60-mesh rubber particles in a weight ratio of 100:3:0.5:0.5 to form aggregate. Then place the aggregate in an oven at 80 °C for 2.5 h to remove moisture, and then cool it to room temperature;

[0055] S3. Mix the modified bisphenol epoxy resin and the curing agent evenly, add additives (composed of defoaming agent, leveling agent, and ultraviolet absorber with a weight ratio of 0.75:1:1.25), and then mix evenly again to obtain a modified resin binder;

[0056] S4. Mix the aggregate and the modified resin binder evenly, and then the modified resin concrete for steel bridge deck paving is obtained.

[0057] The difference between Example 2 and Example 1 is that in the composition raw materials, the weight ratios of each substance are adjusted, but all are within the scope of the present invention.

[0058] Example 3

[0059] S1. Add a curing agent composed of a polyetheramine curing agent, a modified phenolic amine curing agent, an alicyclic amine curing agent, a curing accelerator (composed of a tertiary amine accelerator and a quaternary ammonium salt accelerator in a weight ratio of 1:1), and nano-silica in a weight ratio of 80:40:8:3:0.1;

[0060] S2. Mix stone materials (composed of 5 mm basalt and 8 mm basalt in a weight ratio of 60:40), fillers (limestone powder), fibers (composed of polyacrylonitrile fibers and basalt fibers in a weight ratio of 1:1), and 60-mesh rubber particles evenly in a weight ratio of 100:6:0.2:1.5 to form aggregates. Then place the aggregates in an oven at 80 °C for 2.5 h to remove moisture, and then cool to room temperature;

[0061] S3. Mix the modified bisphenol epoxy resin and the curing agent evenly, add additives (composed of an antifoaming agent, a leveling agent, and an ultraviolet absorber in a weight ratio of 1:1:1), and then mix evenly again to obtain a modified resin binder;

[0062] S4. Mix the aggregates and the modified resin binder evenly by stirring to obtain the modified resin concrete for steel bridge deck paving.

[0063] The difference between Example 3 and Example 1 lies in the selection of the curing accelerator and the fibers in the composition raw materials, but both are within the scope of the present invention.

[0064] Use the modified resin concrete of Example 1 for bridge deck paving:

[0065] The paving structure is composed of a steel plate, an anti-corrosion layer, a waterproof bonding layer, a lower paving layer, an interlayer bonding layer, and an upper paving layer from bottom to top in sequence;

[0066] Both the upper layer and the lower layer use modified resin concrete. Among them, the binder-aggregate ratio of the modified resin concrete used in the upper layer is 8%, and the thickness is 3.0 cm; the binder-aggregate ratio of the modified resin concrete used in the lower layer is 15%, and the thickness is 2.5 cm;

[0067] The anti-corrosion layer uses epoxy zinc-rich paint;

[0068] The waterproof bonding layer uses a modified resin binder, and the dosage is 0.4 kg / m 2 ;

[0069] The interlayer bonding layer is composed of a modified resin binder and 2.5-mm basalt gravel. Among them, the dosage of the interlayer binder is 0.9 kg / m 2 , and the dosage of 2.5-mm basalt gravel is 4.5 kg / m 2 .

[0070] Test the performance indicators of the modified resin concrete in Example 1, and the results are shown in Table 1:

[0071] Test Items Paving Lower Course Paving Upper Course Compressive Strength (MPa) 67 61 Flexural Failure Strain (με) 5470 5093 Four-Point Bending Fatigue Performance (600με, ten thousand times) >300 >200 Impact Toughness (J) 9023 8356

[0072] Test the performance indicators of the paving structure in Example 1, and its performance indicators are shown in Table 2:

[0073]

[0074] According to Table 1, the modified resin concrete prepared by using the raw materials, methods, and ratios of the present invention has high compressive strength, excellent flexural strain capacity, flexural fatigue performance that can reach millions of times, and its impact toughness is also superior to that of conventional concrete.

[0075] According to Table 2, the modified resin concrete paving structure for steel bridge decks of the present invention has excellent high-temperature performance, interface bonding performance, and anti-fatigue performance, and can be effectively applied to the paving of long-span steel bridge decks.

[0076] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A modified resin concrete for steel bridge deck pavement, characterized in that: The concrete is composed of a modified resin binder and aggregates; the modified resin binder is composed of a main agent, a curing agent, and an auxiliary agent; the main agent is a modified bisphenol epoxy resin; the curing agent is composed of a polyetheramine curing agent, a modified phenolic amine curing agent, an alicyclic amine curing agent, a curing accelerator, and nano-silica; the aggregates are a composite of dried stone materials, fillers, fibers, and elastic particles; the auxiliary agent is composed of an antifoaming agent, a leveling agent, and an ultraviolet absorber; The mass ratio of the main agent, the curing agent, and the auxiliary agent is 50 - 110:40 - 100:1 - 3, and the mass of the modified resin binder accounts for 6 - 18% of the mass of the aggregates; The modification steps of the bisphenol epoxy resin are as follows: P1. After mixing the carboxyl-terminated hyperbranched polyester and hydroxylated graphene, add dimethylformamide solvent and disperse by ultrasonic wave, then heat up and continue stirring reaction. After the reaction is completed, remove the excess dimethylformamide to obtain hyperbranched polyester grafted graphene; P2. At room temperature, mix bisphenol epoxy resin, an active diluent, and a polyurethane prepolymer evenly according to the weight ratio of 100:5 - 15:3 - 10 to obtain a composite epoxy resin; P3. At room temperature, mix the composite epoxy resin, ultrafine fully vulcanized powder rubber, and hyperbranched polyester grafted graphene evenly according to the weight ratio of 100:2 - 15:0.1 - 0.5, and then disperse them in turn by ultrasonic wave and high-speed shear machine. After uniform dispersion, nano-material modified epoxy resin can be obtained.

2. The modified resin concrete for steel bridge deck pavement according to claim 1, characterized in that: The bisphenol epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and hydrogenated bisphenol A epoxy resin; the active diluent is at least one of allyl glycidyl ether, n-butyl glycidyl ether, phenyl glycidyl ether, and tolyl glycidyl ether.

3. The modified resin concrete for steel bridge deck pavement according to claim 1, wherein: The ultrafine fully vulcanized powder rubber is ultrafine fully vulcanized carboxylated nitrile powder rubber, and its particle size is 88 - 92 nm.

4. A modified resin concrete for steel bridge deck pavement according to claim 1, characterized in that: The weight ratio of the polyetheramine curing agent, the modified phenolic amine curing agent, the alicyclic amine curing agent, the curing accelerator, and nano-silica is 80 - 100:30 - 50:3 - 8:2 - 6:0.1 - 0.5; The polyetheramine curing agent is at least one of D-230, D-400, and D-2000; The modified phenolic amine curing agent is a compound formed by the Mannich reaction of phenol, aldehyde, and amine. Among them, the phenol is a mixture composed of cashew phenol and styrenated phenol with a mass ratio of 1:1; the aldehyde is trioxymethylene; the amine is at least one of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and divinylpropylamine; The alicyclic amine curing agent is at least one of N-aminoethylpiperazine, isophorone diamine, and bis(4-amino-3-methylcyclohexyl)methane; the curing accelerator is at least one of 2,4,6-tris(dimethylaminomethyl)phenol, tertiary amine accelerators, and quaternary ammonium salt accelerators.

5. The modified resin concrete for steel bridge deck pavement according to claim 1, characterized in that: The mass ratio of the stone materials, fillers, fibers, and elastic particle composites in the aggregates is 100:2 - 8:0.2 - 0.5:0.5 - 1.5; The stone material is basalt, and the proportion of basalt with a particle size of 0 - 5 mm and 5 - 10 mm is 60 - 80:20 - 40; The fiber is at least one of basalt fiber, polypropylene fiber, polyacrylonitrile fiber, and polyimide fiber; the filler is limestone powder; the elastic particles are rubber particles with a mesh size of 40 - 80.

6. The modified resin concrete for steel bridge deck pavement according to claim 1, wherein: When modifying the bisphenol epoxy resin, in step P1, after adding the dimethylformamide solvent, ultrasonic dispersion is carried out at 60°C for 2 h, the temperature after heating is 120°C, and the stirring reaction time is 36 h; In step P3, the rotational speed of the high-speed shearing machine is 500 - 1000 r / min.

7. A modified resin concrete for steel bridge deck paving according to any one of claims 1-5 further includes a preparation method of the modified resin concrete for steel bridge deck paving, characterized in that: It includes the following steps, S1. Prepare the main agent and curing agent of the modified resin binder respectively; S2. Mix the stone materials, filler, fiber, and elastic particles evenly in proportion to obtain the aggregate, and then place the aggregate in an oven at 105 - 110°C for drying for 2 - 3 h, remove the moisture and then cool it to room temperature; S3. Mix the main agent and curing agent evenly, add the auxiliary agent and mix evenly again to obtain the modified resin binder; S4. Mix the aggregate and the modified resin binder evenly by stirring to obtain the modified resin concrete for steel bridge deck paving.

8. Use a modified resin concrete for steel bridge deck paving as described in claims 1 - 5, and set up a steel bridge deck paving structure. The paving structure consists of a steel plate, an anti-corrosion layer, a waterproof bonding layer, a lower paving layer, an interlayer bonding layer, and an upper paving layer from bottom to top in sequence; Both the upper layer and the lower layer use modified resin concrete. Among them, the binder - aggregate ratio of the modified resin concrete used in the upper layer is 6 - 12%, and the thickness is 2.0 - 4.0 cm; the binder - aggregate ratio of the modified resin concrete used in the lower layer is 12 - 18%, and the thickness is 1.5 - 3.5 cm; The anti - corrosion layer uses epoxy zinc - rich paint; The waterproof bonding layer uses a modified resin binder, and the dosage is 0.3 - 0.5 kg / m 2 ; The interlayer bonding layer is composed of a modified resin binder and basalt gravel with a size of 2 - 3 mm, where the dosage of the interlayer binder is 0.6 - 1.2 kg / m 2 , and the dosage of the basalt gravel with a size of 2 - 3 mm is 3.0 - 6.0 kg / m 2 .

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