Ultra-high-strength resin elastic concrete for bridge expansion joint and preparation method thereof

Abstract

The application relates to the technical field of bridge expansion joints and discloses a super-high-strength resin elastic concrete for bridge expansion joints, which comprises three components A, B and C, the component A is a main agent, the component B is a curing agent, and the component C is an aggregate; the main agent is a graphene modified epoxy resin; the weight ratio of the component A to the component B is 60-100:30-60; and the total weight of the component A and the component B accounts for 10-15% of the weight of the component C. The super-high-strength resin elastic concrete has high mechanical strength, rut dynamic stability and shear strength with interface concrete, is more durable in use, can absorb impact stress, can be exempted from a steel structure, greatly shortens construction time, has short maintenance time, has no obvious car jumping when a vehicle drives through the expansion joint, has lower noise and is easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of bridge expansion joint technology, specifically to an ultra-high strength resin elastic concrete for bridge expansion joints and its preparation method. Background Technology

[0002] Bridge expansion joints are joints installed between the ends of two beams, between a beam end and an abutment, or at hinged joints of the bridge to accommodate bridge deck deformation. Their function is to regulate displacement and connection between the superstructure caused by vehicle loads and bridge construction materials. Damage to these expansion joints can negatively impact driving comfort and safety.

[0003] Chinese patent document CN108046658B discloses a high-strength, high-toughness epoxy resin concrete for the transition zone of bridge expansion joints and its preparation method. The high-strength, high-toughness epoxy resin concrete for the transition zone of bridge expansion joints consists of three components, A, B, and C, with a weight ratio of A:B:C = 100:25-50:500-800. The formulation of component A by weight is: 35-50 parts of nano-rubber modified epoxy resin and 45-6 parts of liquid bisphenol A type epoxy resin. Component A consists of: 0 parts epoxy reactive diluent, 0-5 parts epoxy reactive diluent, 0.1-0.3 parts defoamer, and 0.1-0.3 parts dispersant; Component B, by weight, consists of: 100 parts epoxy curing agent, 0-6 parts curing accelerator, 0.5-2 parts coupling agent, and 0.01-0.05 parts pigment; Component C, by weight, consists of: 100 parts sand, 50-100 parts quartz powder, 10-15 parts fly ash, 5-15 parts waste rubber powder, 5-15 parts magnetite powder, and 10-20 parts chopped fiber.

[0004] The existing technology has the following shortcomings: the impact toughness and bonding strength of the existing bridge expansion joint materials are still insufficient, making the expansion joints prone to cracking during operation. This not only puts great pressure on transportation, but also increases the maintenance cost of transportation facilities, and the maintenance conditions are more demanding. Summary of the Invention

[0005] To address the problems of easy cracking and demanding maintenance conditions during the operation of expansion joints, this invention provides an ultra-high strength resin elastic concrete for bridge expansion joints, comprising three components: A, B, and C. Component A is the main agent, component B is the curing agent, and component C is the aggregate. The main agent is graphene-modified epoxy resin, the weight ratio of component A to component B is 60-100:30-60, and the total weight of components A and B accounts for 10-15% of the weight of component C.

[0006] Furthermore, the graphene-modified epoxy resin includes hyperbranched polyester-grafted graphene, bisphenol A type epoxy resin E51, cellulose epoxy resin, dimer acid diglycidyl ester, and reactive diluent.

[0007] Furthermore, the hyperbranched polyester is a carboxyl-terminated hyperbranched polyester.

[0008] Furthermore, the graphene is hydroxylated graphene.

[0009] Furthermore, the cellulose epoxy resin is a mixture of ethoxy cellulose epoxy resin and propoxy cellulose epoxy resin in a weight ratio of 2:3.

[0010] Furthermore, the active diluent is at least one of allyl glycidyl ether, n-butyl glycidyl ether, phenyl glycidyl ether, and tolyl glycidyl ether.

[0011] To improve the impact toughness of ultra-high strength resin elastic concrete and absorb impact stress, the curing agent includes polyetheramine curing agent, glycidyl ester modified amine curing agent, glycidyl ether modified amine curing agent, curing accelerator and anti-aging agent, with a weight ratio of 50-100:30-50:20-40:2-6:0.2-1.

[0012] Preferably, the glycidyl ester modified amine curing agent is prepared by amination reaction of glycidyl ester and isophorone diamine, and the glycidyl ester is at least one of glycidyl oleate, diglycidyl dimerase, and glycidyl methacrylate.

[0013] Preferably, the glycidyl ether modified amine curing agent is prepared by the addition reaction of n-butyl glycidyl ether and diethylenetriamine.

[0014] Preferably, the curing accelerator is at least one of DMP-30, tertiary amine accelerator, and quaternary ammonium salt accelerator.

[0015] Preferably, the anti-aging agent is a complex of a UV absorber and a hindered phenolic antioxidant in a weight ratio of 1-3:2-5; the UV absorber is at least one of UV-531, UV-234, UV-326, and UV-292; and the hindered phenolic antioxidant is at least one of antioxidant 1024, antioxidant 1098, antioxidant 1010, and antioxidant 1076.

[0016] To further improve the impact toughness and wear resistance of ultra-high strength resin elastic concrete, the aggregate is a composite of stone, fiber and elastic particles with a weight ratio of 100:0.2-0.5:1-5.

[0017] Preferably, the stone is continuously graded corundum with a particle size of 0-10mm, wherein the proportion of 5-10mm, 3-5mm and 0-3mm is 15-30:15-35:30-60; the fiber is at least one of polypropylene fiber, polyacrylonitrile fiber and polyimide fiber, with a length of 2-6mm; and the elastic particles are continuously graded rubber particles with a particle size of 0-2mm.

[0018] A method for preparing ultra-high strength resin elastic concrete for bridge expansion joints includes the following steps:

[0019] Step 1.1: Place hyperbranched polyester and graphene in a container, add dimethylformamide solvent, disperse by ultrasonication, then heat and stir to react. After the reaction is complete, remove excess solvent to obtain hyperbranched polyester grafted graphene.

[0020] Step 1.2: At room temperature, mix bisphenol A type epoxy resin E51, cellulose epoxy resin, dimer acid diglycidyl ester and reactive diluent evenly in a weight ratio of 100:5-15:5-10:10-15 to obtain composite epoxy resin.

[0021] Step 1.3: At room temperature, the composite epoxy resin and hyperbranched polyester grafted graphene are ultrasonically dispersed and mixed evenly at a weight ratio of 100:0.1-0.5 to obtain graphene modified epoxy resin, i.e. component A.

[0022] Step 2: At room temperature, mix polyetheramine curing agent, glycidyl ester modified amine curing agent, glycidyl ether modified amine curing agent, curing accelerator and anti-aging agent evenly in a weight ratio of 50-100:30-50:20-40:2-6:0.2-1 to obtain component B;

[0023] Step 3: Remove moisture from the stone, fiber and elastic particles, and then mix them evenly at a weight ratio of 100:0.2-0.5:1-5 to obtain component C;

[0024] Step 4: Mix component A and component B evenly at room temperature to obtain the modified resin material;

[0025] Step 5: At room temperature, pour the modified resin material and component C into a mixing pot and stir evenly to obtain the ultra-high strength resin elastic concrete for bridge expansion joints.

[0026] The present invention has the following beneficial effects:

[0027] 1. Graphene-modified epoxy resin can improve the toughness of the material, and its curing system, combined with polyetheramine curing agents, glycidyl ester-modified amine curing agents, and glycidyl ether-modified amine curing agents, can synergistically enhance the performance of the modified resin material. Simultaneously, fibers and elastic particles can further improve the impact toughness of ultra-high strength resin elastic concrete, enabling it to absorb impact stress. This eliminates the need for steel structures, significantly shortens construction time, reduces vehicle bounce when passing through expansion joints, lowers noise levels, and facilitates maintenance. Furthermore, it avoids traffic accidents caused by steel fracture and fatigue fracture of the comb plate, ensuring safer traffic.

[0028] 2. Ultra-high strength resin elastic concrete exhibits high mechanical strength, rutting dynamic stability, and interfacial shear strength, making it more durable. Furthermore, ultra-high strength resin elastic concrete can be opened to traffic approximately 2 hours after construction, with a short curing time. It can be used for both newly constructed bridge expansion joints and for the rapid repair and maintenance of existing bridge expansion joints. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method:

[0030] Example 1

[0031] A type of ultra-high strength resin elastic concrete for bridge expansion joints is composed of three components: A, B, and C. Component A is the main agent, component B is the curing agent, and component C is the aggregate. The weight ratio of component A to component B is 60:30. The total weight of components A and B accounts for 10% of the weight of component C. The graphene-modified epoxy resin includes hyperbranched polyester-grafted graphene, bisphenol A type epoxy resin E51, cellulose epoxy resin, diglycidyl dimerase, and reactive diluent. The curing agent includes polyetheramine curing agent, glycidyl ester-modified amine curing agent, glycidyl ether-modified amine curing agent, curing accelerator, and anti-aging agent.

[0032] The polyetheramine curing agent is D-230; the glycidyl ester modified amine curing agent is prepared by the amination reaction of glycidyl ester and isophorone diamine, wherein the glycidyl ester is glycidyl oleate; the glycidyl ether modified amine curing agent is prepared by the addition reaction of n-butyl glycidyl ether and diethylenetriamine; the curing accelerator is DMP-30; the anti-aging agent is a complex of a UV absorber and a hindered phenolic antioxidant in a weight ratio of 1:2. The UV absorber is UV-531; the hindered phenolic antioxidant is antioxidant 1024.

[0033] The aggregate is a composite of stone, fiber, and elastic particles in a weight ratio of 100:0.2:1. The stone is continuously graded corundum with a particle size of 0-10mm, of which the proportions of 5-10mm, 3-5mm, and 0-3mm are 15:15:30; the fiber is polyacrylonitrile fiber with a length of 3mm; and the elastic particles are continuously graded rubber particles with a particle size of 0-2mm.

[0034] A method for preparing ultra-high strength resin elastic concrete for bridge expansion joints includes the following steps:

[0035] Step 1.1: Place carboxyl-terminated hyperbranched polyester and hydroxylated graphene into a flask, add dimethylformamide solvent, ultrasonically disperse at 60°C for 2 hours, then raise the temperature to 120°C and stir for 36 hours. After the reaction is complete, remove excess solvent to obtain hyperbranched polyester grafted graphene.

[0036] Step 1.2: At room temperature, mix bisphenol A type epoxy resin E51, cellulose epoxy resin, dimer acid diglycidyl ester and reactive diluent evenly in a weight ratio of 100:5:5:10 to obtain composite epoxy resin.

[0037] Step 1.3: At room temperature, the composite epoxy resin and hyperbranched polyester grafted graphene are ultrasonically dispersed and mixed evenly at a weight ratio of 100:0.1 to obtain graphene modified epoxy resin, i.e., component A.

[0038] Step 2: At room temperature, mix the polyetheramine curing agent, glycidyl ester modified amine curing agent, glycidyl ether modified amine curing agent, curing accelerator and anti-aging agent evenly in a weight ratio of 50:30:20:2:0.2 to obtain component B;

[0039] Step 3: Place the stone, fiber, and elastic granules in an oven at 105~110℃ for 2~3 hours to remove moisture, then cool to room temperature, and pour them into a mixing pot at a weight ratio of 100:0.2:1 and mix evenly to obtain component C;

[0040] Step 4: Mix component A and component B evenly at room temperature to obtain the modified resin material;

[0041] Step 5: At room temperature, pour the modified resin material and component C into a mixing pot and stir for 2-3 minutes to obtain the ultra-high strength resin elastic concrete for bridge expansion joints.

[0042] Example 2

[0043] A type of ultra-high strength resin elastic concrete for bridge expansion joints is composed of three components: A, B, and C. Component A is the main agent, component B is the curing agent, and component C is the aggregate. The weight ratio of component A to component B is 100:60. The total weight of components A and B accounts for 15% of the weight of component C. The graphene-modified epoxy resin includes hyperbranched polyester-grafted graphene, bisphenol A type epoxy resin E51, cellulose epoxy resin, diglycidyl dimerase, and reactive diluent. The curing agent includes polyetheramine curing agent, glycidyl ester-modified amine curing agent, glycidyl ether-modified amine curing agent, curing accelerator, and anti-aging agent.

[0044] The polyetheramine curing agent is D-230; the glycidyl ester modified amine curing agent is prepared by the amination reaction of glycidyl ester and isophorone diamine, wherein the glycidyl ester is diglycidyl dimerase and glycidyl methacrylate; the glycidyl ether modified amine curing agent is prepared by the addition reaction of n-butyl glycidyl ether and diethylenetriamine; the curing accelerator is a tertiary amine accelerator and a quaternary ammonium salt accelerator; the anti-aging agent is a complex of ultraviolet absorber and hindered phenolic antioxidant in a weight ratio of 3:5. The ultraviolet absorbers are UV-326 and UV-292; the hindered phenolic antioxidant is antioxidant 1098.

[0045] The aggregate is a composite of stone, fiber, and elastic particles in a weight ratio of 100:0.5:5. The stone is continuously graded corundum with a particle size of 0-10mm, of which the proportions of 5-10mm, 3-5mm, and 0-3mm are 30:35:60; the fiber is polyimide fiber with a length of 5mm; and the elastic particles are continuously graded rubber particles with a particle size of 0-2mm.

[0046] A method for preparing ultra-high strength resin elastic concrete for bridge expansion joints includes the following steps:

[0047] Step 1.1: Place carboxyl-terminated hyperbranched polyester and hydroxylated graphene into a flask, add dimethylformamide solvent, ultrasonically disperse at 60°C for 2 hours, then raise the temperature to 120°C and stir for 36 hours. After the reaction is complete, remove excess solvent to obtain hyperbranched polyester grafted graphene.

[0048] Step 1.2: At room temperature, mix bisphenol A type epoxy resin E51, cellulose epoxy resin, dimer acid diglycidyl ester and reactive diluent evenly in a weight ratio of 100:15:10:15 to obtain composite epoxy resin.

[0049] Step 1.3: At room temperature, the composite epoxy resin and hyperbranched polyester grafted graphene are ultrasonically dispersed and mixed evenly at a weight ratio of 100:0.5 to obtain graphene modified epoxy resin, i.e. component A.

[0050] Step 2: At room temperature, mix polyetheramine curing agent, glycidyl ester modified amine curing agent, glycidyl ether modified amine curing agent, curing accelerator and anti-aging agent evenly in a weight ratio of 100:50:40:6:1 to obtain component B;

[0051] Step 3: Place the stone, fiber, and elastic granules in an oven at 105~110℃ for 2~3 hours to remove moisture, then cool to room temperature, and pour them into a mixing pot at a weight ratio of 100:0.5:5 and mix evenly to obtain component C;

[0052] Step 4: Mix component A and component B evenly at room temperature according to the specified ratio to obtain the modified resin material;

[0053] Step 5: At room temperature, pour the modified resin material and component C into a mixing pot and stir for 2-3 minutes to obtain the ultra-high strength resin elastic concrete for bridge expansion joints.

[0054] The performance parameters of the ultra-high strength resin elastic concrete for bridge expansion joints prepared in Examples 1 and 2 above are shown in the table below.

[0055]

[0056] Table 1

[0057] A specific construction method for ultra-high strength resin elastic concrete for bridge expansion joints includes the following steps:

[0058] Step 1: Clean the bridge expansion joints, ensuring the grooves are clean and dry;

[0059] Step 2: Fill the expansion joint with extruded polystyrene boards of appropriate size, making them flush with the height of the bridge deck pavement layer;

[0060] Step 3: Apply modified resin material evenly to the interface between cement concrete and asphalt concrete in the trench.

[0061] Step 4: Pour the lower layer of ultra-high strength resin elastic concrete, 10-12cm thick, and compact it;

[0062] Step 5: Apply modified resin material to the surface of the lower layer of ultra-high strength resin elastic concrete, and pour the upper layer of ultra-high strength resin elastic concrete with a thickness of 2-3cm. No compaction is required; simply smooth and level the surface.

[0063] Step 6: Spread anti-slip aggregate with a particle size of 1-2mm until the anti-slip aggregate is evenly distributed on the top layer. After curing, clean up any excess anti-slip aggregate.

[0064] Step 7: The total weight of components A and B of the lower layer of ultra-high strength resin elastic concrete accounts for 10-13% of the weight of component C; the total weight of components A and B of the upper layer of ultra-high strength resin elastic concrete accounts for 13-15% of the weight of component C.

[0065] Step 8: When pouring ultra-high strength resin elastic concrete, both sides must be carried out simultaneously, and the ultra-high strength resin elastic concrete must be poured, compacted or smoothed within 10-20 minutes after mixing.

[0066] Step 9: The construction of ultra-high strength resin elastic concrete must be carried out when the temperature is above 10℃ and does not exceed 40℃. If the temperature is below 10℃, heating and insulation measures must be taken. If the temperature exceeds 40℃, cooling measures must be taken.

[0067] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A type of ultra-high strength resin elastic concrete for bridge expansion joints, comprising three components A, B, and C, wherein component A is the main agent, component B is the curing agent, and component C is the aggregate, characterized in that... The main component is graphene-modified epoxy resin, with a weight ratio of component A to component B of 60-100:30-60; the total weight of components A and B accounts for 10-15% of the weight of component C; the graphene-modified epoxy resin includes hyperbranched polyester-grafted graphene, bisphenol A type epoxy resin E51, cellulose epoxy resin, diglycidyl dimerase, and reactive diluent; the curing agent includes polyetheramine curing agent, glycidyl ester-modified amine curing agent, glycidyl ether-modified amine curing agent, curing accelerator, and anti-aging agent, with a weight ratio of 50-100:30-50:20-40:2-6:0.2-1; the aggregate is a composite of stone, fiber, and elastic particles; the stone is continuously graded corundum.

2. The ultra-high strength resin elastic concrete for bridge expansion joints according to claim 1, characterized in that: The glycidyl ester modified amine curing agent is prepared by amination reaction of glycidyl ester and isophorone diamine, wherein the glycidyl ester is at least one of glycidyl oleate, diglycidyl dimerase, and glycidyl methacrylate.

3. The ultra-high strength resin elastic concrete for bridge expansion joints according to claim 2, characterized in that: The glycidyl ether modified amine curing agent is prepared by the addition reaction of n-butyl glycidyl ether with diethylenetriamine.

4. The ultra-high strength resin elastic concrete for bridge expansion joints according to claim 3, characterized in that: The curing accelerator is at least one of DMP-30, tertiary amine accelerators, and quaternary ammonium salt accelerators.

5. The ultra-high strength resin elastic concrete for bridge expansion joints according to any one of claims 2-4, characterized in that: The anti-aging agent is a complex of a UV absorber and a hindered phenolic antioxidant in a weight ratio of 1-3:2-5; the UV absorber is at least one of UV-531, UV-234, UV-326, and UV-292; and the hindered phenolic antioxidant is at least one of antioxidant 1024, antioxidant 1098, antioxidant 1010, and antioxidant 1076.

6. The ultra-high strength resin elastic concrete for bridge expansion joints according to claim 5, characterized in that: The aggregate is a composite of stone, fiber, and elastic particles in a weight ratio of 100:0.2-0.5:1-5.

7. The ultra-high strength resin elastic concrete for bridge expansion joints according to claim 6, characterized in that: The aggregate is continuously graded corundum with a particle size of 0-10mm, wherein the proportions of 5-10mm, 3-5mm, and 0-3mm are 15-30:15-35:30-60; the fiber is at least one of polypropylene fiber, polyacrylonitrile fiber, and polyimide fiber, with a length of 2-6mm; the elastic particles are continuously graded rubber particles with a particle size of 0-2mm.

8. The method for preparing ultra-high strength resin elastic concrete for bridge expansion joints according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1.1: Place hyperbranched polyester and graphene in a container, add dimethylformamide solvent, disperse by ultrasonication, then heat and stir to react. After the reaction is complete, remove excess solvent to obtain hyperbranched polyester grafted graphene. Step 1.2: At room temperature, mix bisphenol A type epoxy resin E51, cellulose epoxy resin, dimer acid diglycidyl ester and reactive diluent evenly in a weight ratio of 100:5-15:5-10:10-15 to obtain composite epoxy resin. Step 1.3: At room temperature, the composite epoxy resin and hyperbranched polyester grafted graphene are ultrasonically dispersed and mixed evenly at a weight ratio of 100:0.1-0.5 to obtain graphene modified epoxy resin, i.e. component A. Step 2: At room temperature, mix polyetheramine curing agent, glycidyl ester modified amine curing agent, glycidyl ether modified amine curing agent, curing accelerator and anti-aging agent evenly in a weight ratio of 50-100:30-50:20-40:2-6:0.2-1 to obtain component B; Step 3: Remove moisture from the stone, fiber and elastic particles, and then mix them evenly at a weight ratio of 100:0.2-0.5:1-5 to obtain component C; Step 4: Mix component A and component B evenly at room temperature to obtain the modified resin material; Step 5: At room temperature, pour the modified resin material and component C into a mixing pot and stir evenly to obtain the ultra-high strength resin elastic concrete for bridge expansion joints.

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