A durable and long-lasting snow-melting microsurfacing pavement pre-maintenance material and its preparation method

Abstract

The present invention provides a durable long-lasting snow-melting micro-surfacing pavement pre-maintenance material and its preparation method, which is prepared from synthetic aggregate, cement, water, high-viscosity emulsified asphalt, epoxy resin, and slow-release snow-melting particles according to a mass ratio of 100: 1-3: 6-10: 9-12: 1-3: 7-11; the preparation method includes the preparation of slow-release snow-melting particles and the preparation of durable long-lasting snow-melting micro-surfacing pavement pre-maintenance material. The durable long-lasting snow-melting pavement pre-maintenance material obtained by the present invention effectively applies inorganic chloride snow-melting agent to the micro-surfacing material, not only realizes the improvement and maintenance of the snow-melting ability of the micro-surfacing material, but also extends the service life of the micro-surfacing material itself, and realizes the full play of the two functions of snow-melting and maintenance in the whole life cycle. During the peak period of road maintenance in our country, it has significant popularization and application value.

Description

Technical Field

[0001] The present invention belongs to the field of road engineering, and particularly relates to a durable snow-melting micro-surfacing pavement pre-maintenance material and a preparation method thereof. Background Art

[0002] In China, a developed road traffic network has been formed. However, in northern, central and other regions, snowfall in winter easily leads to traffic accidents in special sections such as tunnel entrances and exits, turning points, long longitudinal slope sections of bridges, shady parts of municipal roads, road intersections, expressways, and on- and off-ramps, bringing great inconvenience to life safety and social order. At present, for the pavement traffic problems caused by snowfall and icing, generally, passive snow melting is carried out by spreading deicing salts or mechanical snow removal after snowfall, which not only consumes a large amount of manpower and material resources, but also cannot avoid the impact on vehicle traffic during the snowfall and snow removal processes. In terms of active snow melting technology, at present, some research scholars have proposed technical ideas for heating pavements such as pre-burying conductive carbon fiber for deicing and laying heat pipes for deicing. However, this method has high construction costs, high maintenance costs, and high energy consumption, and is only applicable to some important and special demand sections, and it is difficult to be widely applied on a large scale; while the technical idea of incorporating a snow melting agent mainly composed of calcium chloride and sodium chloride into pavement materials and reducing the freezing point through the precipitation of salts can also effectively achieve the purpose of active snow melting. This technology has the technical advantages of good snow melting effect and low cost, and has a broad application prospect in the future.

[0003] On the other hand, China's pavement engineering has entered a stage of equal emphasis on construction and maintenance. In recent years, the demand for road maintenance and renovation projects has been huge. Therefore, carrying out preventive maintenance at a reasonable time during the service life of the road is the main technical means to extend the service life of the road in the future. However, as the most commonly used road pre-maintenance material, traditional micro-surfacing has a large room for improvement in terms of the heavy-duty service characteristics and functional requirements of modern road traffic. At present, some research scholars have proposed the design idea of micro-surfacing materials with snow melting functions, mainly by adding organic snow melting agents to reduce the freezing point, surfactants to inhibit icing, and phase change materials to store heat for snow melting. However, due to its high solubility in water, the most effective chloride-based inorganic snow melting agent at present dissolves during the mixing process with emulsified asphalt and is lost after demulsification, making it difficult to accumulate inside the asphalt and difficult to be directly applied in micro-surfacing materials, which to a certain extent limits the improvement of the snow melting ability and long-term effect of snow-melting micro-surfacing materials.

[0004] In view of the above technical status quo, the present invention proposes a technical method for "shell-core" structure snow-melting particles. A slow-release snow-melting inner core is prepared by an alkali activation method, and a water-soluble outer shell layer is wrapped. During the mixing process of the micro-surfacing material, the outer shell layer is gradually dissolved, and the inner snow-melting core is wrapped by high-viscosity asphalt, playing a long-term snow-melting function, so that the service life of the snow-melting effect is coordinated with the service life of the micro-surfacing material, and a new type of snow-melting micro-surfacing material with durable service and long-term snow-melting characteristics is prepared. Summary of the Invention

[0005] The technical task of the present invention is to address the deficiencies of the above prior art and propose a durable long-term snow-melting micro-surfacing pavement pre-maintenance material and its preparation method for the problem that chloride-based high-efficiency snow-melting agents are difficult to directly apply in micro-surfacing.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a durable long-term snow-melting micro-surfacing pavement pre-maintenance material, and the mass ratio of each component is: synthetic aggregate, cement, water, high-viscosity emulsified asphalt, epoxy resin, slow-release snow-melting particles = 100: 1-3: 6-10: 9-12: 1-3: 7-11.

[0007] Further, the synthetic aggregate is aggregate with a particle size of 5 < particle size ≤ 10 mm, aggregate with a particle size of 3 < particle size ≤ 5 mm, aggregate with a particle size ≤ 3 mm, and filler; the mass ratio of aggregates and fillers with different particle sizes is determined according to the grading curve range of MS-3 type micro-surfacing mixture; the aggregate is basalt or diabase crushed aggregate, and the crushing value < 10 wt%; the filler is limestone ground fine mineral powder, and the passing rate of the 0.075 mm sieve hole is 80-95 wt%.

[0008] Further, the water-based epoxy resin is E51 type epoxy resin.

[0009] Further, the cement is ordinary Portland 42.5 cement or 52.5 cement.

[0010] Further, the high-viscosity emulsified asphalt is cationic slow-cracking type, the solid content ≥ 60 wt%, the dynamic viscosity at 60 °C ≥ 20000 Pa·s, and the softening point ≥ 80 °C.

[0011] Further, the slow-release snow-melting particles are prepared by wrapping a slow-release snow-melting inner core and a water-soluble outer shell layer in a mass ratio of 100: 10-35 in a "shell-core" structure manner.

[0012] Further, the slow-release snow-melting inner core is prepared from slag powder, snow-melting components, zeolite carrier, alkali activator solution, pore-forming agent, and water in a mass ratio of 100: 20-60: 30-90: 12-25: 1-6: 0-10; the water-soluble outer shell layer is prepared by mixing and wrapping gypsum powder, filler, and curing agent in a mass ratio of 100: 50-90: 30-80.

[0013] Further, the slag powder is obtained by grinding granulated blast furnace slag, with a specific surface area of 400 m 2 / kg - 600 m 2 / kg; the snow melting component is one or a mixture of calcium chloride, sodium chloride, and magnesium chloride in any proportion; the zeolite carrier is natural zeolite; the alkali activator solution is water glass, with a water glass modulus M = 1 - 2; the pore-forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder, with a passing rate of 80 - 95 wt% through a 0.075 mm sieve hole; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

[0014] The present invention also provides a preparation method for the above-mentioned durable long-lasting snow melting micro-surfacing pavement pre-maintenance material, which includes the following steps:

[0015] 1) Preparation of slow-release snow melting particles

[0016] Dissolve the snow melting component in water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 5 - 10 h, let stand for more than 24 h, filter the mixed solution by suction, dry, and grind to obtain the zeolite carrier loaded with the snow melting component; mix the slag powder and the zeolite carrier loaded with the snow melting component and place them in a disk granulator to stir for 3 - 5 min; sequentially add the pore-forming agent, water, and alkali activator solution, and stir to form 1 - 2 mm particles; add the gypsum powder and the filler to the disk granulator, stir evenly, and add the curing agent, stir and coat to obtain spherical particles, and the particles are naturally cured for more than 28 d to obtain the slow-release snow melting particles.

[0017] 2) Preparation of durable long-lasting snow melting micro-surfacing pavement pre-maintenance material

[0018] Stir the synthetic aggregate and the slow-release snow melting particle mixture for 3 - 5 min, add high-viscosity emulsified asphalt and epoxy resin, and stir for 10 - 20 s under the condition that the mixer speed is 80 - 100 rad / min, and then add cement and water and stir for 5 - 12 s under the condition that the mixer speed is 50 - 80 rad / min to obtain the durable long-lasting snow melting micro-surfacing pavement pre-maintenance material.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) When the slow-release snow-melting particles of the present invention are mixed with high-viscosity emulsified asphalt, under the action of mechanical stirring, the water in the emulsified asphalt softens the gypsum in the water-soluble shell on the outer layer of the slow-release snow-melting particles and gradually decomposes during the demulsification process. When there is more water in the early stage of mixing the micro-surfacing material, it can protect the internal snow-melting core, prevent the snow-melting components from dissolving in the water, and further ensure that the snow-melting components will not dissolve during the mixing stage through multi-scale pore channels (the pore structure of alkali-activated materials and the pore structure of natural zeolites), and show a slow-release effect during the service period.

[0021] (2) The present invention uses high-viscosity emulsified asphalt with high cohesive ability after demulsification. During the process of softening and disintegrating the water-soluble shell in the slow-release snow-melting particles, fillers and curing agents are released, enabling the fillers and high-viscosity emulsified asphalt to form more structural asphalt. Moreover, the curing agent can also undergo a curing reaction with epoxy resin, comprehensively improving the cohesion of the micro-surfacing material, having a better cementing effect on the aggregate and snow-melting particles under traffic loads, and achieving the effects of long-term durability of the micro-surfacing material and long-term effectiveness of the snow-melting function.

[0022] In summary, the present invention uses the above technical means to effectively apply inorganic chloride snow-melting agents to micro-surfacing materials. It not only realizes the improvement and maintenance of the snow-melting ability of micro-surfacing materials, but also extends the service life of micro-surfacing materials themselves, achieving the full play of the two functions of snow-melting and maintenance in the whole life cycle, and having significant popularization and application value during the peak period of road maintenance in our country. Specific Embodiments

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further details the present invention with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Example 1:

[0025] A durable and long-lasting snow-melting micro-surfacing pavement pre-maintenance material, and the mass ratio of each component in its raw materials is: synthetic aggregate: cement: water: high-viscosity emulsified asphalt: epoxy resin: slow-release snow-melting particles = 100:1:7:12:2:7.

[0026] Among them, the synthetic aggregate is composed of aggregates with a particle size of 5 < particle size ≤ 10 mm: aggregates with a particle size of 3 < particle size ≤ 5 mm: aggregates with a particle size ≤ 3 mm: filler = 18:21:53:8 by mass ratio. The aggregate is basalt aggregate with a crushing value of 8.6 wt%; the filler is limestone ground fine mineral powder with a passing rate of 91.2 wt% through a 0.075 mm sieve hole.

[0027] Among them, the water-based epoxy resin is E51 type epoxy resin.

[0028] Among them, the cement is ordinary portland cement 42.5.

[0029] Among them, the high-viscosity emulsified asphalt is cationic slow-cracking type, with a solid content of 61.4%, a dynamic viscosity of 42730 Pa·s at 60 °C, and a softening point of 85.5 °C.

[0030] Among them, the slow-release snow-melting particles are prepared from a slow-release snow-melting core and a water-soluble outer shell layer in a mass ratio of 100:10; the mass ratio of each raw material of the slow-release snow-melting core is slag powder:snow-melting component:zeolite carrier:alkali activator solution:pore-forming agent:water = 100:20:40:25:3:3; the mass ratio of each raw material of the water-soluble outer shell layer is gypsum powder:filler:curing agent = 100:60:50.

[0031] Among them, the slag powder is obtained by grinding granulated blast furnace slag, with a specific surface area of 435 m 2 / kg; the snow-melting component is calcium chloride; the zeolite carrier is natural zeolite; the alkali activator solution is water glass with a water glass modulus M = 1.3; the pore-forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder with a 0.075 mm sieve hole passing rate of 91.2 wt%; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

[0032] The preparation steps are as follows:

[0033] 1) Preparation of slow-release snow-melting particles

[0034] Dissolve the snow-melting component in distilled water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 6 h, stand for 24 h, filter, dry, and grind the mixed solution to obtain the zeolite carrier loaded with the snow-melting component; mix the slag powder and the zeolite carrier loaded with the snow-melting component in a mass ratio and place them in a disk granulator to stir for 3.5 min to form a uniformly dispersed powder; sequentially and slowly add the pore-forming agent, water, and alkali activator solution, stir and form into 1-2 mm particles; continue to add gypsum powder and filler in a mass ratio in the disk granulator and stir evenly, and slowly add the curing agent, stir and wrap to obtain spherical particles, and the particles are naturally cured for 28 d to obtain the slow-release snow-melting particles.

[0035] 2) Preparation of durable long-acting snow-melting micro-surfacing pavement pre-maintenance material

[0036] Stir the synthetic aggregate and the slow-release snow-melting particles in a mass ratio for 3 min, sequentially add the high-viscosity emulsified asphalt and epoxy resin, stir for 15 s under the condition of a mixer speed of 80 rad / min, and then add cement and water and stir for 8 s under the condition of a mixer speed of 80 rad / min to obtain the durable long-acting snow-melting micro-surfacing pavement pre-maintenance material.

[0037] The performance test results are as follows:

[0038] Table 1 Performance indicators of the durable long - acting snow - melting micro - surfacing pavement pre - maintenance material prepared in Example 1

[0039] Index Example 1 SBS microsurfacing SBR microsurfacing Specification requirements <![CDATA[1d wet wheel abrasion value / g / m 2 > 352 392 483 <540 Cohesion at 30 min / N·m 2.3 1.5 1.2 ≥1.2 Cohesion at 60 min / N·m 2.9 2.3 2.1 ≥2.0 Chloride ion concentration at 3 h / mol / L 2.5 / / /

[0040] The results show that the wet wheel abrasion value and cohesion index of the durable long - acting snow - melting micro - surfacing in Example 1 are significantly higher than those of traditional SBS micro - surfacing and SBR micro - surfacing materials, and a certain concentration of chloride ions can be dissolved under immersion conditions, indicating that the snow - melting components in the micro - surfacing material are effectively precipitated and can achieve the effect of melting snow and deicing during snowfall.

[0041] Example 2:

[0042] A durable long - acting snow - melting micro - surfacing pavement pre - maintenance material, the mass ratio of each component in its raw materials is as follows: synthetic aggregate: cement: water: high - viscosity emulsified asphalt: epoxy resin: slow - release snow - melting particles = 100:2:9:9:3:9.

[0043] Among them, the synthetic aggregate is composed of aggregates with particle size 5 < particle size ≤ 10mm: aggregates with particle size 3 < particle size ≤ 5mm: aggregates with particle size ≤ 3mm: filler = 19:21:51:9 by mass ratio. The aggregate is gray - green rock aggregate with a crushing value of 9.2wt%; the filler is limestone fine - ground ore powder with a passing rate of 88.5wt% through a 0.075mm sieve hole; the water - based epoxy resin is E51 type epoxy resin.

[0044] Among them, the cement is ordinary Portland 52.5 cement.

[0045] Among them, the high - viscosity emulsified asphalt is cationic slow - cracking type, with a solid content of 60.8%, a dynamic viscosity of 52891Pa·s at 60℃, and a softening point of 86.0℃.

[0046] Among them, the slow - release snow - melting particles are prepared from a slow - release snow - melting core and a water - soluble outer shell layer with a mass ratio of 100:20. The mass ratio of each raw material of the slow - release snow - melting core is as follows: slag powder: snow - melting component: zeolite carrier: alkali - activated agent solution: pore - forming agent: water = 100:60:90:25:6:8; the mass ratio of each raw material of the water - soluble outer shell layer is as follows: gypsum powder: filler: curing agent = 100:50:80.

[0047] Among them, the slag powder is obtained by grinding granulated blast - furnace slag, with a specific surface area of 525m 2 / kg; the snow-melting component is calcium chloride; the zeolite carrier is natural zeolite; the alkali activator solution is water glass with a water glass modulus M = 1.2; the pore-forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder with a 0.075 mm sieve aperture passing rate of 88.5 wt%; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

[0048] The preparation steps are as follows:

[0049] 1) Preparation of slow-release snow-melting particles

[0050] Dissolve the snow-melting component in distilled water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 10 h, let stand for 24 h, filter the mixed solution by suction, dry and grind it to obtain the zeolite carrier loaded with the snow-melting component; mix the slag powder and the zeolite carrier loaded with the snow-melting component according to the mass ratio and place them in a disk granulator to stir for 5 min to form a uniformly dispersed powder; sequentially and slowly add the pore-forming agent, water, and alkali activator solution, stir and form into 1 - 2 mm particles; continue to add gypsum powder and filler in the disk granulator according to the mass ratio, stir evenly, and slowly add the curing agent, stir and wrap to obtain spherical particles, and the particles are naturally cured for 28 d to obtain slow-release snow-melting particles.

[0051] 2) Preparation of durable long-term snow-melting micro-surfacing pavement pre-maintenance material

[0052] Mix the synthetic aggregate and the slow-release snow-melting particles according to the mass ratio of the mixture and stir for 5 min, sequentially add high-viscosity emulsified asphalt and epoxy resin, stir for 20 s under the condition of a mixer speed of 100 rad / min, then add cement and water, and stir for 5 s under the condition of a mixer speed of 50 rad / min to obtain a durable long-term snow-melting micro-surfacing pavement pre-maintenance material.

[0053] The performance test results are as follows:

[0054] Table 2 Performance indicators of the durable long-term snow-melting micro-surfacing pavement pre-maintenance material prepared in Example 2

[0055]

[0056]

[0057] The results show that the wet wheel abrasion value and cohesion index of the durable long-term snow-melting micro-surfacing in Example 2 are significantly higher than those of traditional SBS micro-surfacing and SBR micro-surfacing materials, and a certain chloride ion concentration can be dissolved under the immersion condition, indicating that the snow-melting component in the micro-surfacing material is effectively precipitated and can play the role of melting snow and deicing when it snows.

[0058] Example 3:

[0059] A durable and long - acting pre - maintenance material for micro - surfacing of snow - melting pavement. The mass ratio of each component in the raw materials is as follows: synthetic aggregate: cement: water: high - viscosity emulsified asphalt: epoxy resin: slow - release snow - melting particles = 100:1:6:11:1:11.

[0060] Among them, the synthetic aggregate is composed by mass ratio as follows: aggregate with 5 < particle size ≤ 10mm: aggregate with 3 < particle size ≤ 5mm: aggregate with particle size ≤ 3mm: filler = 21:19:49:11. The aggregate is basalt aggregate with a crushing value of 7.3wt%. The filler is finely ground limestone powder with a passing rate of 90.2wt% through a 0.075mm sieve hole. The water - based epoxy resin is E51 type epoxy resin.

[0061] Among them, the cement is ordinary Portland 42.5 cement.

[0062] Among them, the high - viscosity emulsified asphalt is cationic slow - cracking type, with a solid content of 62.0%, a dynamic viscosity of 33215Pa·s at 60℃, and a softening point of 84.5℃.

[0063] Among them, the slow - release snow - melting particles are prepared from a slow - release snow - melting core and a water - soluble outer shell layer with a mass ratio of 100:30. The mass ratio of each raw material in the slow - release snow - melting core is as follows: slag powder: snow - melting component: zeolite carrier: alkali activator solution: pore - forming agent: water = 100:50:70:15:2:10. The mass ratio of each raw material in the water - soluble outer shell layer is as follows: gypsum powder: filler: curing agent = 100:50:30.

[0064] Among them, the slag powder is obtained by grinding granulated blast - furnace slag, with a specific surface area of 433m 2 / kg; the snow - melting component is a mixture of calcium chloride and magnesium chloride with a mass ratio of 100:50; the zeolite carrier is natural zeolite; the alkali activator solution is water glass with a water glass modulus M = 1.5; the pore - forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder with a passing rate of 90.2wt% through a 0.075mm sieve hole; the curing agent is a non - ionic self - emulsifying epoxy resin curing agent.

[0065] The preparation steps are as follows:

[0066] 1) Preparation of slow - release snow - melting particles

[0067] Dissolve the snow-melting component in distilled water to form a saturated solution. Add zeolite carrier, stir ultrasonically for 5 h, and let it stand for 24 h. Filter the mixed solution by suction, dry it, and grind it to obtain a zeolite carrier loaded with the snow-melting component. Mix the slag powder and the zeolite carrier loaded with the snow-melting component according to the mass ratio and place them in a disk granulator to stir for 3 min to form a uniformly dispersed powder. Slowly add the pore-forming agent, water, and alkali activator solution in sequence, and stir to form 1-2 mm particles. Continue to add gypsum powder and filler in the disk granulator according to the mass ratio, stir evenly, and slowly add the curing agent. After stirring and coating, spherical particles are obtained. The particles are naturally cured for 28 d to obtain the slow-release snow-melting particles.

[0068] 2) Preparation of durable long-acting snow-melting microsurfacing pavement pre-maintenance material

[0069] Mix the synthetic aggregate and the slow-release snow-melting particles according to the mass ratio and stir for 3 min. Add high-viscosity emulsified asphalt and epoxy resin in sequence and stir for 10 s under the condition of a mixer speed of 80 rad / min. Then add cement and water and stir for 10 s under the condition of a mixer speed of 70 rad / min to obtain a durable long-acting snow-melting microsurfacing pavement pre-maintenance material.

[0070] The performance test results are as follows:

[0071] Table 3 Performance indexes of the durable long-acting snow-melting microsurfacing pavement pre-maintenance material prepared in Example 3

[0072] Index Example 3 SBS microsurfacing SBR microsurfacing Specification requirements <![CDATA[1d wet wheel abrasion value / g / m 2 > 355 392 483 <540 Cohesion at 30 min / N·m 2.3 1.5 1.2 ≥1.2 Cohesion at 60 min / N·m 2.8 2.3 2.1 ≥2.0 Chloride ion concentration at 3 h / mol / L 4.2 / / /

[0073] The results show that the wet wheel abrasion value and cohesion index of the durable long-acting snow-melting microsurfacing in Example 3 are significantly higher than those of traditional SBS microsurfacing and SBR microsurfacing materials, and a certain concentration of chloride ions can be dissolved under the immersion condition, indicating that the snow-melting component in the microsurfacing material is effectively precipitated and can play the role of melting snow and ice when it snows.

[0074] Example 4:

[0075] A durable long-acting snow-melting microsurfacing pavement pre-maintenance material, and the mass ratio of each component in its raw materials is: synthetic aggregate: cement: water: high-viscosity emulsified asphalt: epoxy resin: slow-release snow-melting particles = 100: 2: 6: 10: 3: 8.

[0076] Among them, the synthetic aggregate is composed of aggregate with 5 < particle size ≤ 10 mm: aggregate with 3 < particle size ≤ 5 mm: aggregate with particle size ≤ 3 mm: filler = 20: 20: 50: 10 according to the mass ratio. The aggregate is gray-green rock aggregate with a crushing value of 7.1 wt%. The filler is limestone ground fine mineral powder with a passing rate of 89.3 wt% through a 0.075 mm sieve hole. The water-based epoxy resin is E51 type epoxy resin.

[0077] Among them, the cement is ordinary Portland 52.5 cement.

[0078] Among them, the high-viscosity emulsified asphalt is cationic slow-cracking type, with a solid content of 61.1%, a dynamic viscosity of 42343 Pa·s at 60 °C, and a softening point of 82.0 °C.

[0079] Among them, the slow-release snow-melting particles are prepared from a slow-release snow-melting core and a water-soluble outer shell layer in a mass ratio of 100:10. The mass ratio of each raw material of the slow-release snow-melting core is as follows: slag powder:snow-melting component:zeolite carrier:alkali activator solution:pore-forming agent:water = 100:50:60:20:3:2; the mass ratio of each raw material of the water-soluble outer shell layer is as follows: gypsum powder:filler:curing agent = 100:90:80.

[0080] Among them, the slag powder is obtained by grinding granulated blast furnace slag, with a specific surface area of 588 m 2 / kg; the snow-melting component is sodium chloride; the zeolite carrier is natural zeolite; the alkali activator solution is water glass with a water glass modulus M = 1.7; the pore-forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder with a 0.075 mm sieve aperture passing rate of 89.3 wt%; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

[0081] The preparation steps are as follows:

[0082] 1) Preparation of slow-release snow-melting particles

[0083] Dissolve the snow-melting component in distilled water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 7 h, let stand for 24 h, filter the mixed solution by suction, dry, and grind to obtain the zeolite carrier loaded with the snow-melting component; mix the slag powder and the zeolite carrier loaded with the snow-melting component in a mass ratio and place them in a disk granulator to stir for 4 min to form a uniformly dispersed powder; sequentially and slowly add the pore-forming agent, water, and alkali activator solution, and stir to form 1-2 mm particles; continue to add gypsum powder and filler in a mass ratio in the disk granulator and stir evenly, and slowly add the curing agent, stir and wrap to obtain spherical particles, and the particles are naturally cured for 28 d to obtain the slow-release snow-melting particles.

[0084] 2) Preparation of durable long-acting snow-melting micro-surfacing pavement pre-maintenance material

[0085] Mix the synthetic aggregate and the slow-release snow-melting particles in a mass ratio and stir for 3 min, sequentially add the high-viscosity emulsified asphalt and epoxy resin, stir for 10 s under the condition of a mixer speed of 90 rad / min, then add cement and water, and stir for 12 s under the condition of a mixer speed of 60 rad / min to obtain the durable long-acting snow-melting micro-surfacing pavement pre-maintenance material.

[0086] The performance test results are as follows:

[0087] Table 4 Performance indicators of the durable long - acting snow - melting microsurfacing pavement pre - maintenance material prepared in Example 4

[0088] Index Example 4 SBS microsurfacing SBR microsurfacing Specification requirements <![CDATA[1d wet wheel abrasion value / g / m 2 > 361 392 483 <540 Cohesion at 30 min / N·m 2.2 1.5 1.2 ≥1.2 Cohesion at 60 min / N·m 2.6 2.3 2.1 ≥2.0 Chloride ion concentration at 3 h / mol / L 3.9 / / /

[0089] The results show that the wet wheel abrasion value and cohesion index of the durable long - acting snow - melting microsurfacing in Example 4 are significantly higher than those of traditional SBS microsurfacing and SBR microsurfacing materials, and a certain concentration of chloride ions can be dissolved under immersion conditions, indicating that the snow - melting components in the microsurfacing material are effectively precipitated and can play the role of melting snow and ice when it snows.

[0090] Example 5:

[0091] A durable long - acting snow - melting microsurfacing pavement pre - maintenance material, in which the mass ratio of each component in the raw materials is: synthetic aggregate: cement: water: high - viscosity emulsified asphalt: epoxy resin: slow - release snow - melting particles = 100:3:6:12:3:10.

[0092] Among them, the synthetic aggregate is composed of aggregates with particle size 5 < particle size ≤ 10mm: aggregates with particle size 3 < particle size ≤ 5mm: aggregates with particle size ≤ 3mm: filler = 18:20:52:10 by mass ratio. The aggregate is gray - green rock aggregate with a crushing value of 6.1wt%; the filler is limestone ground fine ore powder with a 0.075mm sieve hole passing rate of 91.1wt%; the water - based epoxy resin is E51 type epoxy resin.

[0093] Among them, the cement is ordinary Portland 52.5 cement.

[0094] Among them, the high - viscosity emulsified asphalt is cationic slow - cracking type, with a solid content of 62.3%, a 60°C dynamic viscosity of 86218Pa·s, and a softening point of 88.5°C.

[0095] Among them, the slow - release snow - melting particles are prepared from a slow - release snow - melting core and a water - soluble outer shell layer with a mass ratio of 100:35. The mass ratio of each raw material of the slow - release snow - melting core is: slag powder: snow - melting component: zeolite carrier: alkali - activated agent solution: pore - forming agent: water = 100:20:30:25:2:2; the mass ratio of each raw material of the water - soluble outer shell layer is: gypsum powder: filler: curing agent = 100:70:80.

[0096] In the above scheme, the slag powder is obtained by grinding granulated blast furnace slag, with a specific surface area of 582m 2 / kg; The snow-melting component is a mixture of calcium chloride, sodium chloride, and magnesium chloride in a mass ratio of 100:80:20; the zeolite carrier is natural zeolite; the alkali activator solution is water glass with a water glass modulus M = 1.5; the pore-forming agent is aluminum powder; the gypsum powder is powdery dihydrate gypsum; the filler is finely ground limestone powder with a 91.1 wt% passing rate through a 0.075 mm sieve hole; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

[0097] The preparation steps are as follows:

[0098] 1) Preparation of slow-release snow-melting particles

[0099] Dissolve the snow-melting component in distilled water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 6 h, let it stand for 24 h, filter the mixed solution by suction, dry it, and grind it to obtain the zeolite carrier loaded with the snow-melting component; mix the slag powder and the zeolite carrier loaded with the snow-melting component according to the mass ratio and place them in a disk granulator to stir for 5 min to form a uniformly dispersed powder; slowly add the pore-forming agent, water, and alkali activator solution in sequence, stir and form into 1 - 2 mm particles; continue to add gypsum powder and filler in the disk granulator according to the mass ratio, stir evenly, and slowly add the curing agent, stir and wrap to obtain spherical particles, and the particles are naturally cured for 28 d to obtain slow-release snow-melting particles.

[0100] 2) Preparation of durable long-term snow-melting micro-surfacing pavement pre-maintenance material

[0101] Mix the synthetic aggregate and slow-release snow-melting particles according to the mass ratio and stir for 5 min, then add high-viscosity emulsified asphalt and epoxy resin in sequence, stir for 20 s under the condition of a mixer speed of 100 rad / min, and then add cement and water, stir for 12 s under the condition of a mixer speed of 80 rad / min to obtain a durable long-term snow-melting micro-surfacing pavement pre-maintenance material.

[0102] The performance test results are as follows:

[0103] Table 5 Performance indicators of the durable long-term snow-melting micro-surfacing pavement pre-maintenance material prepared in Example 5

[0104] Index Example 5 SBS microsurfacing SBR microsurfacing Specification requirements <![CDATA[1d wet wheel abrasion value / g / m 2 > 341 392 483 <540 Cohesion at 30 min / N·m 2.4 1.5 1.2 ≥1.2 Cohesion at 60 min / N·m 3.0 2.3 2.1 ≥2.0 Chloride ion concentration at 3 h / mol / L 3.6 / / /

[0105] The results show that the wet wheel abrasion value and cohesion index of the durable long-term snow-melting micro-surfacing in Example 5 are significantly higher than those of traditional SBS micro-surfacing and SBR micro-surfacing materials, and a certain chloride ion concentration can be dissolved under the immersion condition, indicating that the snow-melting component in the micro-surfacing material is effectively precipitated and can play the role of melting snow and deicing when it snows.

[0106] The upper and lower limit values of each raw material listed in the present invention can all implement the present invention, and no further examples are given here.

[0107] The above technical solutions illustrate the technical concept of the present invention. The protection scope of the present invention cannot be limited thereby. Any modifications and decorations made to the above technical solutions based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention all fall within the protection scope of the technical solutions of the present invention.

Claims

1. A durable and long-lasting micro-surfacing pre-maintenance material for snow-melting pavement, characterized in that, The mass ratio of each component is: synthetic aggregate, cement, water, high-viscosity emulsified asphalt, epoxy resin, slow-release snow-melting particles = 100: 1-3: 6-10: 9-12: 1-3: 7-11; The slow-release snow-melting particles are prepared by wrapping a slow-release snow-melting core and a water-soluble outer shell layer in a mass ratio of 100: 10-35 in a "shell-core" structure; The slow-release snow-melting core is prepared from slag powder, snow-melting components, zeolite carrier, alkali activator solution, pore-forming agent, and water in a mass ratio of 100: 20-60: 30-90: 12-25: 1-6: 0-10; the water-soluble outer shell layer is prepared by mixing and wrapping gypsum powder, filler, and curing agent in a mass ratio of 100: 50-90: 30-80; The snow-melting components are one or more of calcium chloride, sodium chloride, and magnesium chloride mixed in any proportion; the zeolite carrier is natural zeolite; the alkali activator solution is water glass.

2. The durable long-lasting snow-melting microsurfacing pavement pre-maintenance material according to claim 1, characterized in that, The synthetic aggregate is 5 < particle size ≤ 10 mm aggregate, 3 < particle size ≤ 5 mm aggregate, particle size ≤ 3 mm aggregate, and filler; the mass ratio of aggregates and fillers with different particle sizes is determined according to the grading curve range of MS-3 type micro-surfacing mixture.

3. The durable long-lasting snow-melting microsurfacing pavement pre-maintenance material according to claim 2, characterized in that, The aggregate is basalt or diabase crushed aggregate with a crushing value < 10 wt%; the filler is limestone ground fine mineral powder with a 0.075 mm sieve hole passing rate of 80-95 wt%.

4. The durable and long-lasting snow-melting micro-surfacing pavement pre-maintenance material according to claim 1, characterized in that, The water-based epoxy resin is E51 type epoxy resin.

5. A durable and long-lasting snow-melting microsurfacing pavement pre-maintenance material according to claim 1, characterized in that, The cement is ordinary Portland 42.5 cement or 52.5 cement.

6. The durable long-lasting snow-melting micro-surfacing pavement pre-maintenance material according to claim 1, characterized in that The high-viscosity emulsified asphalt is cationic slow-cracking type, with a solid content ≥ 60 wt%, a 60 °C dynamic viscosity ≥ 20000 Pa·s, and a softening point ≥ 80 °C.

7. A durable and long-lasting snow-melting microsurfacing pavement pre-maintenance material according to claim 1, characterized in that, The slag powder is obtained by grinding granulated blast furnace slag, with a specific surface area of ​​400m 2 / kg-600m 2 / kg; the water glass modulus M=1-2; the pore-forming agent is aluminum powder; the gypsum powder is powdered dihydrate gypsum; the filler is ground limestone powder with a 0.075mm sieve aperture pass rate of 80-95wt%; the curing agent is a non-ionic self-emulsifying epoxy resin curing agent.

8. The preparation method of a durable long-acting snow-melting micro-surfacing pavement pre-maintenance material according to any one of claims 1 to 7, characterized in that, It includes the following steps: 1) Preparation of slow-release snow-melting particles Dissolve the snow-melting components in water to form a saturated solution, add the zeolite carrier, stir ultrasonically for 5-10 h, let stand for more than 24 h, filter the mixed solution by suction, dry, and grind to obtain the zeolite carrier loaded with snow-melting components; mix the slag powder and the zeolite carrier loaded with snow-melting components and place them in a disk granulator to stir for 3-5 min; sequentially add the pore-forming agent, water, and alkali activator solution, and stir to form 1-2 mm particles; add gypsum powder and filler to the disk granulator, stir evenly, add the curing agent, and stir and wrap to obtain spherical particles. The particles are naturally cured for more than 28 d to obtain the slow-release snow-melting particles; 2) Preparation of durable long-acting snow-melting micro-surfacing pavement pre-maintenance material Stir the synthetic aggregate and slow-release snow-melting particle mixture for 3-5 min, add high-viscosity emulsified asphalt and epoxy resin, stir for 10-20 s under the condition of a mixer speed of 80-100 rad / min, then add cement and water and stir for 5-12 s under the condition of a mixer speed of 50-80 rad / min to obtain the durable long-acting snow-melting micro-surfacing pavement pre-maintenance material.

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