Micronized ice-melting micro-surfacing pavement structure and construction method thereof

Abstract

The invention provides a micronized ice-melting micro-surfacing pavement structure and a construction method thereof, a micronized ice-melting micro-surfacing is laid above a road body, the thickness of the micronized ice-melting micro-surfacing is 100-150mm, the micronized ice-melting micro-surfacing is formed by laying a compound modified anti-freezing micro-surfacing mixture, and the compound modified anti-freezing micro-surfacing mixture is formed by laying a compound modified anti-freezing micro-surfacing mixture. The composite modified anti-freezing micro-surfacing mixture comprises water-borne epoxy resin and wet-set polyurethane composite modified emulsified asphalt, aggregate, a micronized anti-freezing material and anti-cracking fibers, the optimal proportion of the composite modified anti-freezing micro-surfacing mixture is obtained by specially researching the performance of the composite modified anti-freezing micro-surfacing mixture, the anti-freezing performance and the pavement performance, so that the micronized ice-melting micro-surfacing pavement structure has remarkable anti-freezing and deicing effects; and the anti-skid performance is slightly reduced by doping the micronized anti-freezing material, the abrasion value of the mixture after ultraviolet aging is slightly influenced, the anti-stripping performance and the water stability of the mixture are reduced to some extent, and the existing micro-surfacing specification requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of highway maintenance, in particular to a micronized ice-melting micro-surfacing pavement structure and a construction method thereof. Background Art

[0002] In winter, snow and ice easily accumulate on the road surface, which firstly affects vehicle traffic and traffic safety; secondly, it causes serious damage to the road surface and has an adverse effect on road surface performance; thirdly, it wastes a lot of manpower and material resources to clear it.

[0003] Currently, most of the existing technologies for active road deicing and snow removal focus on traditional asphalt mixtures, but there are few technologies that combine active deicing and snow removal materials with micro-surfacing to form active deicing micro-surfacing.

[0004] Based on this, this application targets the special use environment of road surfaces in high-altitude icing areas, and adopts high-performance water-based epoxy resin and moisture-curing polyurethane composite modified emulsified asphalt, and at the same time adds micronized anti-icing materials to the aggregate to prepare a composite modified anti-icing micro-surfacing mixture, which is laid on the road surface to form a composite modified anti-icing micro-surfacing. Special research is also conducted on the performance, anti-icing performance and road performance of the composite modified anti-icing micro-surfacing mixture, aiming to provide technical support for active deicing and road surface function restoration in icing areas. Summary of the Invention

[0005] The patent aims to develop a composite anti-icing micro-surfacing pavement material with excellent comprehensive performance, combining the advantages of the following core components:

[0006] - Moisture-curing polyurethane: A single component that is easy to apply and crosslinks through the reaction of isocyanate groups with moisture to form a polymer network that is highly resistant to weathering and abrasion.

[0007] - Water-based epoxy resin + curing agent: environmentally friendly and low VOC, high hardness and strong chemical resistance after curing, suitable for synergistically enhancing the mechanical properties of micro-surfaces with moisture-curing polyurethane.

[0008] -Compound cationic modified emulsified asphalt: By introducing cationic groups such as quaternary ammonium salts, the hydrophilicity of the emulsified asphalt and its adhesion to the base aggregate are improved, while the impermeability is optimized.

[0009] -Slow-release hydrophobic anti-icing materials: Achieve long-term anti-icing effects through hydrophobic modification (such as silane coupling agents or nano-silica) and slow-release technology (microcapsules encapsulating antifreeze agents).

[0010] Innovation: Through the synergistic effect of multiple components, it solves the problems of low curing efficiency, insufficient weather resistance and poor anti-icing performance of traditional micro-surfacing pavements in humid environments, thereby shortening the road closure time of in-service roads.

[0011] To achieve the above object, the present invention provides the following solutions:

[0012] The present invention provides a micronized ice-melting micro-surfacing pavement structure, comprising a road body, with micronized ice-melting micro-surfacing paved on top of the road body. The thickness of the micronized ice-melting micro-surfacing is 100-150 mm, and the micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt, aggregate, micronized anti-icing material and anti-cracking fiber.

[0013] Preferably, the composite modified anti-icing micro-surfacing mixture comprises, by mass, 35-45% of waterborne epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt, 50-60% of aggregate, 4-8% of micronized anti-icing material, and 1-2% of anti-cracking fiber.

[0014] Preferably, the waterborne epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt comprises, by mass, 2-3.5% moisture-curing polyurethane, 3-5% waterborne epoxy resin, 4-6% emulsifier, and the remainder is base asphalt.

[0015] Preferably, the aggregate comprises coarse aggregate and fine aggregate, and the mass ratio of the coarse aggregate and fine aggregate is 2:3-3:2.

[0016] Preferably, the coarse aggregate is one or more of basalt graded crushed stone, pebbles, brown corundum, and colored ceramic particles.

[0017] Preferably, the fine aggregate is one or two of corundum, basalt powder and brown corundum powder.

[0018] Preferably, the micronized anti-icing material is one of the environmentally friendly acetate series products and chloride salt slow-release series products, and is in the form of granules, powder, or liquid saturated solution. The liquid anti-icing agent is composed of acetate or chloride salt saturated solution, anti-cracking fiber and curing agent, and is produced and stored separately.

[0019] Preferably, the particle size of the micronized anti-icing material is ≤0.3 mm.

[0020] The present invention also provides a construction method for a micronized ice-melting micro-surfacing pavement structure, comprising the following steps:

[0021] S1. Selection and preparation of raw materials, and experimental determination of the composition of the composite modified anti-icing micro-surfacing mixture;

[0022] S2. Equipment commissioning before construction, commissioning of micro-surfacing paver;

[0023] S3. The construction road section is closed using road closure tools to ensure that the construction is not disturbed by pedestrians and motor vehicles;

[0024] S4. Road cleaning: Manually remove any remaining debris and dust from the road surface to ensure the road is clean and free of debris;

[0025] S5. Treatment of minor road surface defects, including treatment or repair of cracks and potholes;

[0026] S6. Load the micro-surfacing paver strictly according to the curing time of the composite modified anti-icing micro-surfacing mixture;

[0027] S7. Pave micro-surfacing: Use a micro-surfacing paver to spread the composite modified anti-icing micro-surfacing mixture on the road surface to a thickness of 100-150mm, and use a roller to flatten it after paving;

[0028] S8. Open to traffic. Wait at least 3 hours after the micro-surfacing cures to open to traffic. The time of opening to traffic can be adjusted flexibly according to weather conditions. The lower the outdoor temperature, the longer the waiting time for opening to traffic.

[0029] Preferably, step S1 includes:

[0030] S11. Using a pre-emulsification, post-modification process, a composite modification was performed by adding wet-cured polyurethane and waterborne epoxy resin to the base emulsified asphalt. The storage stability, evaporation residue, and performance requirements of the emulsion were determined, and the optimal ranges for wet-cured polyurethane content were 2-3.5% and 3-5% for waterborne epoxy resin.

[0031] S12. Clarify the deicing mechanism of micronized anti-icing materials. Through wet wheel abrasion tests and load wheel sand adhesion tests, investigate the effects of varying wet-cured polyurethane, waterborne epoxy resin, and micronized anti-icing material dosages on the performance of the composite modified anti-icing micro-surfacing mixture. The optimal particle size of the micronized anti-icing material is ≤0.3 mm, and the optimal dosage range is 4-8%.

[0032] S13. Conductivity analysis was used to analyze the salt release patterns of the composite modified anti-icing micro-surface by measuring the concentration of deicing salt dissolved in the solution. Five different influencing factors, including moisture-curing polyurethane, water-based epoxy resin, micronized anti-icing material, temperature, and oil-to-stone ratio, were selected to summarize the release patterns of the deicing materials. Anti-icing tests and falling ball impact tests were conducted to investigate the effects of deicing salt on the ice formation process and post-formation strength, and the anti-icing and de-icing effects of the composite modified anti-icing micro-surface were determined.

[0033] S14. Validate the road performance indicators of micronized anti-icing micro-surfacing. Analyze the road performance of the composite modified anti-icing micro-surfacing in terms of anti-skid performance, anti-stripping performance, water stability, and UV aging resistance.

[0034] S15. Prepare micronized anti-icing material, water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt respectively, and compound them according to the formula to prepare composite modified anti-icing micro-surfacing mixture.

[0035] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0036] The present invention provides a micronized ice-melting micro-surfacing pavement structure and a construction method thereof. Micronized ice-melting micro-surfacing is laid on top of a road body. The thickness of the micronized ice-melting micro-surfacing is 100-150 mm. The micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt, aggregate, and micronized anti-icing material. By conducting special research on the performance, anti-icing performance, and road performance of the composite modified anti-icing micro-surfacing mixture, the optimal ratio of the composite modified anti-icing micro-surfacing mixture is obtained, so that the micronized ice-melting micro-surfacing pavement structure has a significant anti-icing and de-icing effect. Experimental verification shows that the addition of the micronized anti-icing material slightly reduces the anti-skid performance, has little effect on the abrasion value of the mixture after ultraviolet aging, and reduces the anti-spalling performance and water stability of the mixture, meeting the requirements of current micro-surfacing specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a flow chart of a construction method for a micronized ice-melting micro-surfacing pavement structure provided by the present invention. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The purpose of the present invention is to provide a micronized ice-melting micro-surfacing pavement structure and a construction method thereof, so as to solve the problems existing in the prior art.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1:

[0043] This embodiment provides a micronized ice-melting micro-surfacing pavement structure, including a road body, on which micronized ice-melting micro-surfacing is laid. The thickness of the micronized ice-melting micro-surfacing is 100 mm, and the micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, aggregate, micronized anti-icing material and anti-cracking fiber.

[0044] Among them, the composite modified anti-icing micro-surfacing mixture, calculated by mass, includes 36% of water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, 59% of aggregate, 4% of micronized anti-icing material, and 1% of anti-cracking fiber.

[0045] Furthermore, the waterborne epoxy resin + wet-curing polyurethane composite modified emulsified asphalt includes, by mass, 2% wet-curing polyurethane, 3% waterborne epoxy resin, 4% emulsifier, and the remainder is base asphalt.

[0046] Among them, the role of wet-curing polyurethane is to improve the flexibility of the coating (elongation at break > 200%) and low-temperature crack resistance (no cracking at -30°C), while compensating for the brittleness of water-based epoxy resin and optimizing the hydrophobic properties when blended with emulsified asphalt; its NCO content is 8%-12%, and the prepolymer molecular weight is 2000-5000.

[0047] The function of waterborne epoxy resin is to provide high strength (compressive resistance ≥25MPa), chemical corrosion resistance and adhesion (≥2.0MPa), while forming an interpenetrating network (IPN) with moisture-cured polyurethane to enhance the balance between flexibility and rigidity; its epoxy equivalent is 180-220g / eq, and the solid content is 40%-50%; its solid content is ≥60%, and the emulsifier type (cationic / non-ionic) must be compatible with the resin.

[0048] The emulsified asphalt obtained by emulsification with an emulsifier serves as a bonding matrix, which can enhance the adhesion to the substrate (>1.5MPa) and provide self-repair of micro-cracks. At the same time, the cationic emulsifier combines with the negative charge on the concrete surface to enhance the anchoring effect; the micronized anti-icing material is wrapped to achieve slow release.

[0049] At this point, the wet-curing polyurethane, water-based epoxy resin and emulsified asphalt form a cross-linked interpenetrating network structure.

[0050] Furthermore, the aggregate includes coarse aggregate and fine aggregate, and the mass ratio of the coarse aggregate and fine aggregate is 2:3.

[0051] Furthermore, the coarse aggregate is a mixed coarse aggregate of brown corundum and colored ceramic particles.

[0052] Furthermore, the fine aggregate is corundum.

[0053] Furthermore, the micronized anti-icing material is an environmentally friendly acetate series, which can use potassium acetate or sodium acetate to lower the freezing point (-20--35℃), inhibit ice crystal growth, reduce frost heave stress, and slowly release through the micropores of emulsified asphalt to extend the anti-icing time; combine with the resin network to reduce dissolution loss; and need to be coated (such as SiO2 shell) when used to reduce the deliquescence rate.

[0054] Furthermore, the particle size of the micronized anti-icing material is 0.3 mm.

[0055] This embodiment also provides a construction method for the above-mentioned micronized ice melting micro-surfacing pavement structure, such as Figure 1 As shown, the following steps are included:

[0056] S1. Raw material selection and preparation: Determine the composition of the composite modified anti-icing micro-surfacing mixture through experiments. This step directly determines the final performance of the micro-surfacing and specifically includes:

[0057] S11. Prepare raw materials such as base asphalt, emulsifier, micronized anti-icing material, wet-solid polyurethane, and water-based epoxy resin. Using an emulsification-first, then modification process, wet-solid polyurethane and water-based epoxy resin are added to the base emulsified asphalt for composite modification. Define the emulsion's storage stability, evaporation residue, and performance requirements. Experiments have shown that the emulsified asphalt exhibits optimal overall performance at a dosage of 2-3.5% wet-solid polyurethane and 3-5% water-based epoxy resin. Fluorescence microscopy tests demonstrate good compatibility between the two components with asphalt. The water-based epoxy resin, wet-solid polyurethane, and asphalt form a cross-linked, interpenetrating network structure. The optimal dosage ranges for wet-solid polyurethane and water-based epoxy resin are 2-3.5% and 3-5%, respectively.

[0058] S12. Clarify the deicing mechanism of micronized anti-icing materials. Test the mixing of micronized anti-icing materials with asphalt road micro-surfacing mixtures. Wet wheel abrasion tests and load wheel sand adhesion tests are used to investigate the effects of varying the dosages of wet-curing polyurethane, water-based epoxy resin, and micronized anti-icing materials on the performance of the composite modified anti-icing micro-surfacing mixture. The tests show that the incorporation of micronized anti-icing materials prolongs the mixability of the mixture and reduces its abrasion resistance and rutting resistance. However, the incorporation of wet-curing polyurethane and water-based epoxy resin effectively improves these two properties. A blend with a dosage of 2-3.5% wet-curing polyurethane, 3-5% water-based epoxy resin, and 4-8% micronized anti-icing materials achieves a balance between mixture performance and anti-icing performance. Consequently, it is concluded that the optimal particle size of the micronized anti-icing material is less than or equal to 0.3 mm, and the optimal dosage range of the micronized anti-icing material is 4-8%.

[0059] S13. Conductivity analysis was used to analyze the salt release patterns of the composite modified anti-icing micro-surfacing by measuring the concentration of deicing salt dissolved in the solution. Five different influencing factors, including moisture-curing polyurethane, water-based epoxy resin, micronized anti-icing material, temperature, and oil-to-stone ratio, were selected to summarize the release patterns of the deicing materials. Anti-icing tests and falling ball impact tests were conducted to investigate the effects of deicing salt on the ice formation process and post-formation strength. The conclusion was that the anti-icing micro-surfacing had a significantly greater anti-icing and de-icing effect than conventional micro-surfacing.

[0060] S14. The pavement performance of micronized anti-icing micro-surfacing was verified, analyzing the pavement performance of the composite modified anti-icing micro-surfacing from four perspectives: anti-skid performance, anti-stripping performance, water stability, and UV aging resistance. The experiments showed that the incorporation of micronized anti-icing material slightly reduced anti-skid performance, had little effect on the abrasion value of the mixture after UV aging, and reduced the anti-stripping and water stability of the mixture, meeting the requirements of current micro-surfacing specifications. This indicates that asphalt pavement micro-surfacing with micronized anti-icing material, while enhancing ice and snow removal capabilities, still meets current micro-surfacing specifications.

[0061] S15 were prepared micronized anti-icing material, waterborne epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, according to the preparation of composite modified anti-icing micro-surfacing mixture;

[0062] The above experiments and preparation processes require the following equipment:

[0063] 1. The colloid mill asphalt emulsification test machine is mainly composed of a batching tank, a mixer, a colloid mill, a temperature control system, a circulation system, an operating system, and intelligent electronic control and metering. The operating system can control the temperature of the material, the colloid mill, and its pipelines, while the circulation system can also be used to control the oil-water ratio in real time.

[0064] 2. Emulsified asphalt modification equipment, mainly for stirring and mixing raw materials;

[0065] 3. Wet wheel wear and load wheel sand adhesion test equipment;

[0066] 4. Micro-surfacing mixture anti-icing specimen preparation equipment;

[0067] 5. Anti-icing micro-surfacing anti-skid performance test equipment;

[0068] 6. UV aging test equipment;

[0069] It should be noted that the above devices are all common existing devices in the field, and their usage methods and working principles are well known to ordinary technicians in the field, so their specific structures are not described in detail in this embodiment;

[0070] S2. Equipment commissioning before construction, commissioning of micro-surfacing paver;

[0071] S3. The construction road section is closed using road closure tools to ensure that the construction is not disturbed by pedestrians and motor vehicles;

[0072] S4. Road cleaning: Manually remove any remaining debris and dust from the road surface to ensure the road is clean and free of debris;

[0073] S5. Treatment of minor road surface defects, including treatment or repair of cracks and potholes;

[0074] S6. Load the micro-surfacing paver strictly according to the curing time of the composite modified anti-icing micro-surfacing mixture;

[0075] S7. Pave micro-surfacing: Use a micro-surfacing paver to spread the composite modified anti-icing micro-surfacing mixture on the road surface to a thickness of 100 mm, and use a roller to flatten it after paving;

[0076] S8. Open to traffic. Wait at least 3 hours after the micro-surfacing cures to open to traffic. The opening time can be flexibly adjusted according to weather conditions.

[0077] Example 2:

[0078] The present invention provides a micronized ice-melting micro-surfacing pavement structure, which includes a road body, on which micronized ice-melting micro-surfacing is laid. The thickness of the micronized ice-melting micro-surfacing is 120 mm. The micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, aggregate, micronized anti-icing material and anti-cracking fiber.

[0079] Among them, the composite modified anti-icing micro-surfacing mixture, calculated by mass, includes 40% water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, 53% aggregate, 6% micronized anti-icing material and 1% anti-cracking fiber.

[0080] Furthermore, the waterborne epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt includes, by mass, 2.5% moisture-curing polyurethane, 4% waterborne epoxy resin, 5% emulsifier, and the remainder is base asphalt.

[0081] Among them, the role of wet-curing polyurethane is to improve the flexibility of the coating (elongation at break > 200%) and low-temperature crack resistance (no cracking at -30°C), while compensating for the brittleness of water-based epoxy resin and optimizing the hydrophobic properties when blended with emulsified asphalt; its NCO content is 8%-12%, and the prepolymer molecular weight is 2000-5000.

[0082] The function of waterborne epoxy resin is to provide high strength (compressive resistance ≥25MPa), chemical corrosion resistance and adhesion (≥2.0MPa), while forming an interpenetrating network (IPN) with moisture-cured polyurethane to enhance the balance between flexibility and rigidity; its epoxy equivalent is 180-220g / eq, and the solid content is 40%-50%; its solid content is ≥60%, and the emulsifier type (cationic / non-ionic) must be compatible with the resin.

[0083] The emulsified asphalt obtained by emulsification with an emulsifier serves as a bonding matrix, which can enhance the adhesion to the substrate (>1.5MPa) and provide self-repair of micro-cracks. At the same time, the cationic emulsifier combines with the negative charge on the concrete surface to enhance the anchoring effect; the micronized anti-icing material is wrapped to achieve slow release.

[0084] At this point, the wet-curing polyurethane, water-based epoxy resin and emulsified asphalt form a cross-linked interpenetrating network structure.

[0085] Furthermore, the aggregate includes coarse aggregate and fine aggregate, and the mass ratio of the coarse aggregate and fine aggregate is 1:1.

[0086] Furthermore, the coarse aggregate is a mixed coarse aggregate of brown corundum and colored ceramic particles.

[0087] Furthermore, the fine aggregate is corundum.

[0088] Furthermore, the micronized anti-icing material is an environmentally friendly acetate series, which can use potassium acetate or sodium acetate to lower the freezing point (-20--35℃), inhibit ice crystal growth, reduce frost heave stress, and slowly release through the micropores of emulsified asphalt to extend the anti-icing time; combine with the resin network to reduce dissolution loss; and need to be coated (such as SiO2 shell) when used to reduce the deliquescence rate.

[0089] Furthermore, the particle size of the micronized anti-icing material is 0.3 mm.

[0090] Except for the different ratios of the components in this embodiment, the rest of the solutions are the same as those in embodiment 1.

[0091] Example 3:

[0092] The present invention provides a micronized ice-melting micro-surfacing pavement structure, which includes a road body, on which micronized ice-melting micro-surfacing is laid. The thickness of the micronized ice-melting micro-surfacing is 150 mm. The micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt, aggregate, micronized anti-icing material and anti-cracking fiber.

[0093] Among them, the composite modified anti-icing micro-surfacing mixture, calculated by mass, includes 41% of water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, 50% of aggregate, 8% of micronized anti-icing material and 1% of anti-cracking fiber.

[0094] Furthermore, the waterborne epoxy resin + moisture-curing polyurethane composite modified emulsified asphalt includes, by mass, 3.5% moisture-curing polyurethane, 5% waterborne epoxy resin, 6% emulsifier, and the remainder is base asphalt.

[0095] Among them, the role of wet-curing polyurethane is to improve the flexibility of the coating (elongation at break > 200%) and low-temperature crack resistance (no cracking at -30°C), while compensating for the brittleness of water-based epoxy resin and optimizing the hydrophobic properties when blended with emulsified asphalt; its NCO content is 8%-12%, and the prepolymer molecular weight is 2000-5000.

[0096] The function of waterborne epoxy resin is to provide high strength (compressive resistance ≥25MPa), chemical corrosion resistance and adhesion (≥2.0MPa), while forming an interpenetrating network (IPN) with moisture-cured polyurethane to enhance the balance between flexibility and rigidity; its epoxy equivalent is 180-220g / eq, and the solid content is 40%-50%; its solid content is ≥60%, and the emulsifier type (cationic / non-ionic) must be compatible with the resin.

[0097] The emulsified asphalt obtained by emulsification with an emulsifier serves as a bonding matrix, which can enhance the adhesion to the substrate (>1.5MPa) and provide self-repair of micro-cracks. At the same time, the cationic emulsifier combines with the negative charge on the concrete surface to enhance the anchoring effect; the micronized anti-icing material is wrapped to achieve slow release.

[0098] At this point, water-based epoxy resin, moisture-cured polyurethane and emulsified asphalt form a cross-linked interpenetrating network structure.

[0099] Furthermore, the aggregate includes coarse aggregate and fine aggregate, and the mass ratio of the coarse aggregate and fine aggregate is 1:1.

[0100] Furthermore, the coarse aggregate is a mixed coarse aggregate of brown corundum and colored ceramic particles.

[0101] Furthermore, the fine aggregate is corundum.

[0102] Furthermore, the micronized anti-icing material is an environmentally friendly acetate series, which can use potassium acetate or sodium acetate to lower the freezing point (-20--35℃), inhibit ice crystal growth, reduce frost heave stress, and slowly release through the micropores of emulsified asphalt to extend the anti-icing time; combine with the resin network to reduce dissolution loss; and need to be coated (such as SiO2 shell) when used to reduce the deliquescence rate.

[0103] Furthermore, the particle size of the micronized anti-icing material is 0.3 mm.

[0104] Except for the different ratios of the components in this embodiment, the rest of the solutions are the same as those in embodiment 1.

[0105] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A micronized ice-melting micro-surfacing pavement structure, comprising a road body, characterized in that: Micronized ice-melting micro-surfacing is paved on the road body. The thickness of the micronized ice-melting micro-surfacing is 100-150mm. The micronized ice-melting micro-surfacing is paved with a composite modified anti-icing micro-surfacing mixture. The composite modified anti-icing micro-surfacing mixture includes water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, aggregate, micronized anti-icing material and anti-cracking fiber.

2. The micronized ice-melting micro-surfacing pavement structure according to claim 1 is characterized by: The composite modified anti-icing micro-surfacing mixture comprises, by mass, 35-45% of waterborne epoxy resin + wet-curing polyurethane composite modified emulsified asphalt, 50-60% of aggregate, 4-8% of micronized anti-icing material, and 1-2% of anti-cracking fiber.

3. The micronized ice-melting micro-surfacing pavement structure according to claim 2 is characterized by: The waterborne epoxy resin + wet-curing polyurethane composite modified emulsified asphalt comprises, by mass, 2-3.5% wet-curing polyurethane, 3-5% waterborne epoxy resin, 4-6% emulsifier, and the remainder is base asphalt.

4. The micronized ice-melting micro-surfacing pavement structure according to claim 2 is characterized by: The aggregate includes coarse aggregate and fine aggregate, and the mass ratio of the coarse aggregate and fine aggregate is 2:3-3:

2.

5. The micronized ice-melting micro-surfacing pavement structure according to claim 4 is characterized by: The coarse aggregate is one or more of basalt graded crushed stone, pebbles, brown corundum, and colored ceramic particles.

6. The micronized ice-melting micro-surfacing pavement structure according to claim 4, characterized in that: The fine aggregate is one or two of corundum, basalt powder and brown corundum powder.

7. The micronized ice-melting micro-surfacing pavement structure according to claim 2 is characterized by: The micronized anti-icing material is one of the environmentally friendly acetate series products and chloride salt slow-release series products, and is in the form of granules, powder, or liquid saturated solution. The liquid anti-icing agent is composed of acetate or chloride salt saturated solution, anti-cracking fiber, and curing agent, and is produced and stored separately.

8. The micronized ice-melting micro-surfacing pavement structure according to claim 7, characterized in that: The particle size of the micronized anti-icing material is ≤0.3 mm.

9. A construction method for a micronized ice-melting micro-surfacing pavement structure, characterized in that: The following steps are involved: S1. Selection and preparation of raw materials, and determination of the composition of the composite modified anti-icing micro-surfacing mixture by experiment; S2. Equipment commissioning before construction, commissioning of micro-surfacing paver; S3. The construction section is closed and road closure tools are used to close the construction section to ensure that the construction is not disturbed by pedestrians and motor vehicles; S4. Road cleaning: manually clean the remaining stone chips and dust on the road surface to ensure that the road surface is clean and free of debris; S5. Treat minor road surface defects, treat or repair cracks and potholes on the road surface; S6. Load the micro-surfacing paver strictly according to the curing time of the composite modified anti-icing micro-surfacing mixture; S7. Spreading micro-surfacing, using a micro-surfacing paver to spread the composite modified anti-icing micro-surfacing mixture on the road surface, with a paving thickness of 100-150mm, and using a roller to flatten it after paving; S8. Open to traffic. Wait for the micro-surfacing to solidify for at least 3 hours before opening to traffic. The time of opening to traffic can be flexibly adjusted according to weather conditions. The lower the outdoor temperature, the longer the waiting time for opening to traffic.

10. The construction method of micronized ice-melting micro-surfacing pavement structure according to claim 9, characterized in that: Step S1 includes: S11. Adopting the process of emulsification first and then modification, wet solid polyurethane and waterborne epoxy resin are added to the base emulsified asphalt for composite modification, clarifying the index requirements of emulsion storage stability, evaporation residue and performance index requirements, and obtaining the optimal range of wet solid polyurethane content is 2-3.5% and the optimal range of waterborne epoxy resin content is 3-5%; S12. Clarify the deicing mechanism of micronized anti-icing materials, and explore the effects of different amounts of wet-cured polyurethane, water-based epoxy resin and micronized anti-icing materials on the performance of composite modified anti-icing micro-surfacing mixtures through wet wheel abrasion tests and load wheel sand adhesion tests. It is concluded that the optimal particle size of micronized anti-icing materials is ≤0.3mm, and the optimal range of the amount of micronized anti-icing materials is 4-8%; S13. Conductivity analysis was used to analyze the salt release law of the composite modified anti-icing micro-surface by measuring the concentration of ice-melting salt dissolved in the solution; five different influencing factors, namely, wet-cured polyurethane, water-based epoxy resin, micronized anti-icing material, temperature, and oil-stone ratio, were selected to summarize the release law of deicing materials; the effect of ice-melting salt on the formation process and strength of ice layer after formation was studied through anti-icing test and falling ball impact test, and the anti-icing and deicing effect of the composite modified anti-icing micro-surface was obtained; S14. Verify the road performance of micronized anti-icing micro-surfacing and analyze the road performance of composite modified anti-icing micro-surfacing from four aspects: anti-skid performance, anti-stripping performance, water stability and anti-ultraviolet aging performance; S15. Prepare micronized anti-icing material, water-based epoxy resin + wet-curing polyurethane composite modified emulsified asphalt respectively, and prepare composite modified anti-icing micro-surfacing mixture by compounding according to the formula.

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