High-toughness epoxy asphalt suitable for steel bridge deck pavement and preparation method of high-toughness epoxy asphalt

Abstract

The invention provides high-toughness epoxy asphalt suitable for steel bridge deck pavement and a preparation method of the high-toughness epoxy asphalt. The high-toughness epoxy asphalt is prepared from the following raw materials: an epoxy component, asphalt, a modifier and an accelerant, the epoxy component is composed of epoxy resin and a curing agent, the curing agent is composed of polyether amine and methyl tetrahydrophthalic anhydride, and the asphalt comprises matrix asphalt, a modified compatilizer and an accelerant. By optimizing the raw material ratio and a curing system, a rigid-flexible interpenetrating network structure is realized, and the steel bridge deck pavement material has the characteristics of high toughness, crack resistance and excellent construction retention time, and is suitable for steel bridge deck pavement.

Description

Technical Field

[0001] This invention belongs to the field of building materials, specifically the field of bridge deck paving materials, and specifically relates to a high-toughness epoxy asphalt suitable for steel bridge deck paving and its preparation method. Background Technology

[0002] During long-term service, due to the complex stress on the orthotropic plate structure unique to steel bridge decks, coupled with repeated vehicle loads, temperature changes, and environmental erosion, the pavement layer is prone to various defects such as longitudinal cracks, network cracks, interlayer delamination, and rutting. These defects not only reduce driving comfort and increase maintenance costs, but also seriously threaten the structural safety of the bridge.

[0003] Epoxy asphalt, as a high-performance pavement material, is widely used in steel bridge deck paving due to its high strength and good temperature stability. However, traditional epoxy asphalt has significant shortcomings: insufficient toughness and high brittleness, making it prone to stress concentration and cracking under sudden temperature changes or impact loads; its fatigue performance needs improvement, as microcracks easily propagate under repeated vehicle loads; and its long-term durability is insufficient, easily aging in complex environments. Especially in the special structure of orthotropic steel bridge decks, existing materials struggle to meet the comprehensive requirements of high toughness, fatigue resistance, and long-term durability.

[0004] From a materials science perspective, epoxy resin and asphalt are essentially thermodynamically incompatible systems. A significant difference in interfacial energy exists between them, leading to easy phase separation during simple blending, weakening interfacial bond strength, and affecting the overall performance of the composite material. While existing technologies improve compatibility by adding compatibilizers, the effects are often limited and frequently come at the cost of sacrificing construction allowance time or curing speed, making it difficult to meet the requirements of modern bridge engineering for construction efficiency and quality control.

[0005] Therefore, given the demands of long-span steel bridge construction and the technological bottlenecks of existing materials, there is an urgent need to develop an epoxy asphalt material for steel bridge decks that combines high toughness, good workability, and excellent durability. The aim is for this new material to significantly improve toughness and crack resistance while maintaining the excellent properties of epoxy asphalt, and to ensure sufficient construction allowance time and a reasonable curing speed, thus providing strong support for the development of bridge construction. Summary of the Invention

[0006] The purpose of this invention is to provide a high-toughness epoxy asphalt suitable for steel bridge deck paving and its preparation method, so as to overcome the shortcomings of the existing technology. This invention achieves a rigid-flexible interpenetrating network structure by optimizing the raw material ratio and curing system, which has high toughness, crack resistance, and excellent construction retention time characteristics, and is suitable for steel bridge deck paving.

[0007] This invention is achieved through the following technical solution: A high-toughness epoxy asphalt suitable for steel bridge deck paving is prepared from the following raw materials: epoxy component, asphalt, modifier and accelerator; The epoxy component is composed of epoxy resin and curing agent, the curing agent is composed of polyetheramine and methyltetrahydrophthalic anhydride, and the asphalt includes base asphalt, modified compatibilizer and accelerator. By weight, epoxy resin: 200-240 parts, polyetheramine: 260-300 parts, methyltetrahydrophthalic anhydride: 100-140 parts, base bitumen: 600-640 parts, modified compatibilizer: 10-14 parts, and accelerator: 1-3 parts.

[0008] Furthermore, the epoxy resin is selected from bisphenol A type epoxy resin E51.

[0009] Furthermore, the base asphalt is 70#.

[0010] Furthermore, the modified compatibilizer is maleic anhydride.

[0011] Furthermore, the accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0012] Furthermore, the polyetheramine is polyetheramine D2000.

[0013] A method for preparing high-toughness epoxy asphalt suitable for steel bridge deck paving includes the following steps: 1) Weigh each raw material according to the raw material mass ratio; 2) Add the modified compatibilizer to the base asphalt and stir at 160℃ for 5 hours under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat the epoxy resin at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir evenly at a temperature not lower than 135°C to obtain mixture A; 5) Add the weighed polyetheramine and methyltetrahydrophthalic anhydride to mixture A in sequence, stir well to obtain mixture B; 6) Add an accelerator to mixture B and stir until homogeneous to obtain epoxy asphalt matrix; 7) The epoxy asphalt matrix is ​​cured to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0014] Furthermore, in steps 4), 5), and 6), the stirring time is 3-5 minutes.

[0015] Furthermore, in step 2), the stirring speed is 200 r / min; In steps 4), 5), and 6), the stirring speed is 400 r / min.

[0016] Furthermore, the curing process in step 7) is specifically as follows: first, cure at 80℃ for 6 hours, and then cure at 120℃ for 8 hours.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: (1) High toughness and crack resistance: This invention achieves dual reinforcement and toughening by synergistically combining the long, flexible chains of polyetheramine D2000 with the rigid chains of methyltetrahydrophthalic anhydride to form an interpenetrating "rigid skeleton-flexible chain" toughening network. The polyetheramine segments are covalently embedded in the epoxy network, allowing them to orient, elongate, and absorb energy under stress, effectively preventing crack propagation. The rigid aromatic rings of methyltetrahydrophthalic anhydride provide high crosslinking density, heat resistance, and mechanical strength, forming the rigid skeleton of the network.

[0018] When these two components are co-cured with epoxy resin, they do not form a simple mixture, but rather a unified network of interwoven and synergistically deformable "rigid micro-regions" and "flexible segments." The rigid components ensure overall strength and modulus, while the flexible components relax stress concentration through molecular chain movement. This "rigid-flexible interpenetration" structure enables the material to resist deformation while simultaneously preventing crack initiation and propagation through the yielding deformation of the flexible chains when subjected to the complex alternating stresses of the steel bridge deck. This achieves a balance between high strength and high toughness, far exceeding the performance of single curing agents or simple curing agent mixtures.

[0019] (2) Excellent compatibility and interfacial adhesion: Maleic anhydride acts as a "chemical bridge" and reacts with asphalt molecules under high-temperature stirring, introducing carboxyl / anhydride functional groups onto its surface. These polar groups react chemically with the epoxy groups of the subsequently added epoxy resin and the curing agent at the interface to form covalent bonds. This process transforms the originally physically blended asphalt particles into an "active dispersed phase" anchored in the continuous epoxy phase by chemical bonds. This chemically bonded interface significantly improves the interfacial strength, enabling the asphalt phase to effectively induce crazes and shear bands under stress, absorbing a large amount of energy instead of peeling off from the interface.

[0020] (3) Controllable Construction Retention and Rapid Curing: This invention uses a combination of highly sterically hindered polyetheramine and room-temperature inert anhydride, along with a trace amount of accelerator, to finely control the reaction kinetics. The long-chain structure and secondary amine properties of polyetheramine D2000 make it react slowly with epoxy resin at room temperature, laying the foundation for a long operating period. Methyltetrahydrophthalic anhydride reacts extremely slowly with epoxy at low temperatures and without accelerator, further ensuring the stability of the system during storage and the initial stage of construction. The trace amount of accelerator has a controllable effect on the reaction rate of the system at room temperature, but during the heating and curing stage, its "latent-activation" characteristics are rapidly activated, strongly catalyzing the ring-opening addition reaction of anhydride and epoxy, as well as the addition reaction of amine and epoxy. The three types of components are matched in a stepwise manner in terms of reactivity. During the construction window, the highly sterically hindered polyetheramine and inert anhydride jointly dominate, making the viscosity of the system increase slowly and the residence time exceed 2 hours, which is convenient for transportation, paving and compaction. During the curing stage, heating activates the accelerator and accelerates the reactions of acid anhydrides and amines, allowing the network to form rapidly in a short time, thus shortening the curing cycle and achieving a balance between "long construction period and high curing efficiency".

[0021] (4) Comprehensive performance improvement: Using maleic anhydride-modified asphalt as a "chemically modified dispersed phase" to achieve chemical bonding with epoxy matrix solves the fundamental compatibility problem. A composite curing system of "long-chain polyetheramine D2000 and rigid acid anhydride" is adopted, and a rigid-flexible interpenetrating network is designed and constructed at the molecular scale, fundamentally achieving toughening of epoxy materials. The resulting epoxy asphalt possesses a unified characteristic of thermodynamic compatibility and kinetic stability, and combines high strength, high toughness, fatigue resistance, and aging resistance. It is suitable for steel bridge deck paving, effectively extending the service life of the bridge deck and reducing maintenance costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. The following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 Fluorescent micrograph of epoxy asphalt of this invention; Figure 2 This is a microscopic morphology diagram of the ductile fracture section of epoxy asphalt according to the present invention. Detailed Implementation

[0024] The present invention will now be described in detail: A high-toughness epoxy asphalt suitable for steel bridge deck paving comprises: epoxy component, asphalt, modifier, and accelerator; the epoxy component consists of epoxy resin and curing agent, the curing agent consists of polyetheramine D2000 and methyltetrahydrophthalic anhydride, the asphalt is 70# base asphalt, and modified compatibilizer and accelerator are added; the total formula consists of six components: epoxy resin (200-240 parts), polyetheramine D2000 (260-300 parts), methyltetrahydrophthalic anhydride (100-140 parts), base asphalt (600-640 parts), modified compatibilizer (10-14 parts), and accelerator (1-3 parts).

[0025] The epoxy resin is selected from bisphenol A type epoxy resin E51; the matrix asphalt is 70#; the modified compatibilizer is maleic anhydride; and the accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0026] The above-mentioned method for preparing high-toughness epoxy asphalt suitable for steel bridge decks includes the following steps: 1) Weigh each raw material according to the raw material mass ratio; 2) Maleic anhydride treatment of base asphalt: Add the modified compatibilizer to the base asphalt and stir at 200 r / min for 5 h under vacuum at 160℃ to obtain maleic anhydride modified asphalt; 3) Preheat the epoxy resin at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 400 r / min for 3 to 5 minutes at a temperature not lower than 135°C to obtain mixture A; 5) Add the weighed polyetheramine D2000 and methyltetrahydrophthalic anhydride to mixture A in sequence, and stir at 400 r / min for 3-5 min to obtain mixture B; 6) Add accelerator to mixture B and stir at 400 r / min for 3-5 min to obtain epoxy asphalt matrix; 7) Curing treatment of epoxy asphalt matrix: first cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise specified, the methods and experimental equipment used in the following embodiments are conventional methods and instruments.

[0028] Example 1 A high-toughness epoxy asphalt suitable for steel bridge deck paving is made from the following raw materials in parts by weight: The composition includes 220 parts of bisphenol A type epoxy resin E51, 280 parts of polyetheramine D2000, 120 parts of methyltetrahydrophthalic anhydride, 620 parts of 70# matrix bitumen, 12 parts of maleic anhydride (modified compatibilizer), and 1 part of 2,4,6-tris(dimethylaminomethyl)phenol (accelerator).

[0029] The preparation method includes the following steps: 1) Weigh each raw material according to the above mass ratio; 2) Add maleic anhydride to 70# base asphalt and stir at 200 r / min for 5 h at 160℃ under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat bisphenol A type epoxy resin E51 at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 140℃ and 400r / min for 4min to obtain mixture A; 5) Add polyetheramine D2000 and methyltetrahydrophthalic anhydride sequentially to mixture A, and stir for 4 minutes under the same conditions; 6) Add the accelerator to mixture B and continue stirring for 4 minutes to obtain epoxy asphalt aggregate; 7) Curing the epoxy asphalt matrix: First, cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0030] Example 2 A high-toughness epoxy asphalt suitable for steel bridge deck paving is made from the following raw materials in parts by weight: The composition includes 200 parts of bisphenol A type epoxy resin E51, 260 parts of polyetheramine D2000, 100 parts of methyltetrahydrophthalic anhydride, 600 parts of 70# matrix asphalt, 10 parts of maleic anhydride (modifying compatibilizer), and 1 part of 2,4,6-tris(dimethylaminomethyl)phenol (accelerator).

[0031] The preparation method includes the following steps: 1) Weigh each raw material according to the above mass ratio; 2) Add maleic anhydride to 70# base asphalt and stir at 200 r / min for 5 h at 160℃ under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat bisphenol A type epoxy resin E51 at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 140℃ and 400r / min for 4min to obtain mixture A; 5) Add polyetheramine D2000 and methyltetrahydrophthalic anhydride sequentially to mixture A, and stir for 4 minutes under the same conditions; 6) Add the accelerator to mixture B and continue stirring for 4 minutes to obtain epoxy asphalt aggregate; 7) Curing the epoxy asphalt matrix: First, cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0032] Example 3 A high-toughness epoxy asphalt suitable for steel bridge deck paving is made from the following raw materials in parts by weight: The composition includes 200 parts of bisphenol A type epoxy resin E51, 260 parts of polyetheramine D2000, 110 parts of methyltetrahydrophthalic anhydride, 610 parts of 70# matrix asphalt, 11 parts of maleic anhydride (modified compatibilizer), and 1 part of 2,4,6-tris(dimethylaminomethyl)phenol (accelerator).

[0033] The preparation method includes the following steps: 1) Weigh each raw material according to the above mass ratio; 2) Add maleic anhydride to 70# base asphalt and stir at 200 r / min for 5 h at 160℃ under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat bisphenol A type epoxy resin E51 at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 140℃ and 400r / min for 4min to obtain mixture A; 5) Add polyetheramine D2000 and methyltetrahydrophthalic anhydride sequentially to mixture A, and stir for 4 minutes under the same conditions; 6) Add the accelerator to mixture B and continue stirring for 4 minutes to obtain epoxy asphalt aggregate; 7) Curing the epoxy asphalt matrix: First, cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0034] Example 4 A high-toughness epoxy asphalt suitable for steel bridge deck paving is made from the following raw materials in parts by weight: The composition includes 230 parts of bisphenol A type epoxy resin E51, 290 parts of polyetheramine D2000, 130 parts of methyltetrahydrophthalic anhydride, 630 parts of 70# matrix asphalt, 13 parts of maleic anhydride (modified compatibilizer), and 2 parts of 2,4,6-tris(dimethylaminomethyl)phenol (accelerator).

[0035] The preparation method includes the following steps: 1) Weigh each raw material according to the above mass ratio; 2) Add maleic anhydride to 70# base asphalt and stir at 200 r / min for 5 h at 160℃ under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat bisphenol A type epoxy resin E51 at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 140℃ and 400r / min for 4min to obtain mixture A; 5) Add polyetheramine D2000 and methyltetrahydrophthalic anhydride sequentially to mixture A, and stir for 4 minutes under the same conditions; 6) Add the accelerator to mixture B and continue stirring for 4 minutes to obtain epoxy asphalt aggregate; 7) Curing the epoxy asphalt matrix: First, cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0036] Example 5 A high-toughness epoxy asphalt suitable for steel bridge deck paving is made from the following raw materials in parts by weight: The composition includes 240 parts of bisphenol A type epoxy resin E51, 300 parts of polyetheramine D2000, 140 parts of methyltetrahydrophthalic anhydride, 640 parts of 70# matrix bitumen, 14 parts of maleic anhydride (modified compatibilizer), and 3 parts of 2,4,6-tris(dimethylaminomethyl)phenol (accelerator).

[0037] The preparation method includes the following steps: 1) Weigh each raw material according to the above mass ratio; 2) Add maleic anhydride to 70# base asphalt and stir at 200 r / min for 5 h at 160℃ under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat bisphenol A type epoxy resin E51 at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir at 140℃ and 400r / min for 4min to obtain mixture A; 5) Add polyetheramine D2000 and methyltetrahydrophthalic anhydride sequentially to mixture A, and stir for 4 minutes under the same conditions; 6) Add the accelerator to mixture B and continue stirring for 4 minutes to obtain epoxy asphalt aggregate; 7) Curing the epoxy asphalt matrix: First, cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

[0038] Comparative Example 1 The difference between this comparative example and Example 1 is that E51 epoxy resin in a high-toughness epoxy asphalt suitable for steel bridge deck paving is replaced by an equal amount of E44.

[0039] Comparative Example 2 The difference between this comparative example and Example 1 is that the 70# base asphalt in a high-toughness epoxy asphalt suitable for steel bridge deck paving is replaced by an equal amount of 90# base asphalt.

[0040] Comparative Example 3 The difference between this comparative example and Example 1 is that 2,4,6-tris(dimethylaminomethyl)phenol in a high-toughness epoxy asphalt suitable for steel bridge deck paving is replaced by an equal amount of tris(dimethylamino)propylamine.

[0041] Comparative Example 4 The difference between this comparative example and Example 1 is that the curing agent in the high-toughness epoxy asphalt suitable for steel bridge deck paving does not contain MeTHPA (methyltetrahydrophthalic anhydride).

[0042] Comparative Example 5 The difference between this comparative example and Example 1 is that the high-toughness epoxy asphalt suitable for steel bridge deck paving does not contain accelerators.

[0043] Comparative Example 6 The difference between this comparative example and Example 1 is that the high-toughness epoxy asphalt suitable for steel bridge deck paving does not contain compatibilizers.

[0044] Preparation experiments were conducted on Examples 1-5 and Comparative Examples 1-6 as described above. According to the "Technical Specification for Design and Construction of Highway Steel Bridge Deck Pavement" (JTG / T3364-02-2019), the residence time during the curing process of each example and comparative example, as well as the elongation at break, tensile strength, and bond strength between the epoxy asphalt and the steel plate after curing, were tested. The results are as follows:

[0045] The data in the table show that all embodiments exhibit good overall performance in terms of elongation at break, tensile strength, construction dwell time, and bond strength with the steel plate. Among them, Embodiment 1 achieved the most balanced performance across the four key indicators: elongation at break, tensile strength, dwell time, and bond strength. Specifically: Example 1 exhibits an elongation at break of 204.6%, a tensile strength of 2.56 MPa, a dwell time of 121 min, and a bond strength of 4.51 MPa. It achieves the most balanced performance across these four key indicators, ensuring both high toughness and crack resistance while meeting the practical requirements for construction time. It also ensures reliable adhesion between the pavement layer and the steel bridge deck, making it suitable as a typical mix for widespread application in practical engineering. In Example 2, the amounts of epoxy resin, polyetheramine, and methyltetrahydrophthalic anhydride are all at their lower limits. It has the highest elongation at break at 214.5%, but its tensile strength (2.34 MPa) and bond strength (4.03 MPa) are slightly lower than Example 1, and its dwell time (114 min) is also lower. This indicates that reducing the proportion of rigid components improves the material's flexibility, but at the cost of some mechanical strength, making it suitable for applications requiring high deformation capacity. Example 3, through fine-tuning the mix proportions, achieves a good balance between elongation, strength, and dwell time, with overall performance approaching that of Example 1. In Examples 4 and 5, as the dosage of each component was gradually increased, the tensile strength and bond strength of the material continued to improve, but the elongation at break gradually decreased, reaching 187.5% in Example 5. The retention time also shortened accordingly, to only 92 minutes in Example 5. This trend confirms the regulatory effect of the "rigid-flexible" network: increasing the proportion of rigid components enhances the material's stiffness and bonding force, but reducing the relative proportion of flexible segments leads to a decrease in deformation capacity; simultaneously, increasing the amount of curing agent accelerates the reaction and shortens the construction window. Therefore, in practical engineering, the proportions can be appropriately adjusted based on Example 1, according to the stress characteristics of the bridge deck, ambient temperature, and construction process requirements, to achieve customized performance optimization.

[0046] In Comparative Example 1, replacing epoxy resin E51 with E44 increased the elongation at break to 236.2%, but significantly reduced the tensile strength and bond strength. This is because E44 has a lower epoxy value and lower crosslinking density, resulting in reduced material rigidity and increased flexibility, but impaired overall load-bearing capacity and interfacial bonding performance. This verifies the irreplaceable role of bisphenol A type epoxy resin E51 in ensuring high strength and high adhesion. Comparative Example 2 used 90# base asphalt instead of 70# asphalt, and the performance was similar to Example 1, indicating that the asphalt grade has a limited impact on the core performance in this system. However, 70# asphalt generally has better high-temperature stability, which is more beneficial to the long-term durability of steel bridge deck paving. In Comparative Example 3, replacing the accelerator with tris(dimethylamino)propylamine significantly shortened the residence time to 71 minutes, severely affecting construction operability, while the tensile strength and bond strength did not significantly improve. This indicates that 2,4,6-tris(dimethylaminomethyl)phenol has a higher steric hindrance effect, effectively delaying the reaction at room temperature, thus providing ample construction time. Comparative Example 4, completely devoid of methyltetrahydrophthalic anhydride, exhibited an extremely high elongation at break of 386.2%, but its tensile strength and bond strength decreased sharply to 0.89 MPa and 2.01 MPa, respectively, rendering the material almost incapable of structural load-bearing capacity. This demonstrates that the introduction of rigid anhydride is crucial for forming a complete "rigid-flexible" interpenetrating network: polyetheramine provides flexible segments to absorb energy, while methyltetrahydrophthalic anhydride, through reaction with epoxy groups, constructs rigid crosslinking points, endowing the material with the necessary strength and stiffness. Both are indispensable; otherwise, the system would tend towards a highly elastic state, failing to meet the mechanical requirements of steel bridge deck paving. Comparative Example 5, without the addition of an accelerator, extended the residence time to 142 min, but the bond strength significantly decreased to 3.24 MPa. This indicates that the accelerator not only regulates the curing speed but also promotes interfacial chemical bonding by catalyzing the epoxy-amine / anhydride reaction, thereby enhancing the adhesion between the paving layer and the steel plate. While the lack of an accelerator extended the construction window, it sacrificed long-term interfacial durability. In Comparative Example 6, without the compatibilizer maleic anhydride, the elongation at break reached as high as 456.3%, but the fracture strength and bond strength were significantly reduced, and the retention time was the longest. This is because the epoxy resin and asphalt have poor compatibility, and there are obvious defects at the interface between the two phases, resulting in low stress transfer efficiency and near-failure of interfacial bonding. This result strongly demonstrates that the maleic anhydride treatment of asphalt is a core means to improve the compatibility between the two phases and enhance the interfacial chemical bonding, and is a prerequisite for realizing high-performance epoxy asphalt composite materials.

[0047] This invention successfully prepared an epoxy asphalt material for steel bridge deck paving with high toughness, high strength, excellent workability, and a multi-component synergistic design, consisting of epoxy resin, polyetheramine, methyltetrahydrophthalic anhydride, base asphalt, compatibilizer, and accelerator. Each component plays a unique role in the system: epoxy resin and anhydride form a rigid network, polyetheramine introduces flexible segments, maleic anhydride enhances interfacial compatibility, and the accelerator regulates the curing process. By adjusting the proportions, the rigidity and flexibility of the material can be balanced with the construction process requirements within a certain range. Example 1, as a preferred proportion, demonstrates optimal overall performance balance and is suitable as a typical solution for application in steel bridge deck paving projects. It is expected to significantly improve the crack resistance, fatigue life, and long-term service performance of the paving layer, reduce maintenance costs, and has significant practical engineering value.

[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A high-toughness epoxy asphalt suitable for steel bridge deck paving, characterized in that, It is prepared from the following raw materials: epoxy components, asphalt, modifiers, and accelerators; The epoxy component is composed of epoxy resin and curing agent, the curing agent is composed of polyetheramine and methyltetrahydrophthalic anhydride, and the asphalt includes base asphalt, modified compatibilizer and accelerator. By weight, epoxy resin: 200-240 parts, polyetheramine: 260-300 parts, methyltetrahydrophthalic anhydride: 100-140 parts, base bitumen: 600-640 parts, modified compatibilizer: 10-14 parts, and accelerator: 1-3 parts.

2. The high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 1, characterized in that, The epoxy resin is selected from bisphenol A type epoxy resin E51.

3. The high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 1, characterized in that, The base asphalt is 70#.

4. The high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 1, characterized in that, The modified compatibilizer is maleic anhydride.

5. The high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 1, characterized in that, The accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

6. The high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 1, characterized in that, The polyetheramine is polyetheramine D2000.

7. A method for preparing high-toughness epoxy asphalt suitable for steel bridge deck paving as described in any one of claims 1-6, characterized in that, Includes the following steps: 1) Weigh each raw material according to the raw material mass ratio; 2) Add the modified compatibilizer to the base asphalt and stir at 160℃ for 5 hours under vacuum to obtain maleic anhydride modified asphalt; 3) Preheat the epoxy resin at 60℃ for 20 minutes; 4) Add the preheated epoxy resin to the maleic anhydride modified asphalt and stir evenly at a temperature not lower than 135°C to obtain mixture A; 5) Add the weighed polyetheramine and methyltetrahydrophthalic anhydride to mixture A in sequence, stir well to obtain mixture B; 6) Add an accelerator to mixture B and stir until homogeneous to obtain epoxy asphalt matrix; 7) The epoxy asphalt matrix is ​​cured to obtain high-toughness epoxy asphalt suitable for steel bridge deck paving.

8. The method for preparing high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 7, characterized in that, In steps 4), 5), and 6), the stirring time is 3-5 minutes.

9. A method for preparing high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 7, characterized in that, In step 2), the stirring speed is 200 r / min; In steps 4), 5), and 6), the stirring speed is 400 r / min.

10. A method for preparing high-toughness epoxy asphalt suitable for steel bridge deck paving according to claim 7, characterized in that, The curing process in step 7) is as follows: first cure at 80℃ for 6 hours, then cure at 120℃ for 8 hours.

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