Preparation method of high-performance anti-rutting grouting material

Abstract

The invention provides a preparation method of a high-performance anti-rutting grouting material, and belongs to the field of grouting materials, and the high-performance anti-rutting grouting material is prepared from the following raw materials: 70 # road asphalt, styrene-butadiene-styrene block copolymer, nano zinc oxide, a coupling agent, basalt coarse aggregate, machine-made sand, waste tire rubber powder, carbon fiber chopped strands and expanded vermiculite. In the adding process, a first motor is controlled to operate to drive a fluted disc connected with the first motor to rotate, a lantern ring is driven to rotate through meshing of insections on the side wall, an embedded pipe rotates in a pipe groove under the limiting effect that the embedded ring is embedded in an annular groove, and in the raw material mixing process, through the synergistic modification of nano-zinc oxide and rubber powder, the gradient mixing technology and the compatible design of regenerated materials, the raw materials are mixed uniformly. The excellent performance that the dynamic stability is larger than or equal to 8000 times / mm and the low-temperature bending strain is larger than or equal to 3500 mu epsilon is achieved, and the rutting resistance of the grouting material is improved.

Description

Technical Field

[0001] The present invention relates to the field of grouting materials, in particular to a preparation method of a high-performance anti-rutting grouting material. Background Art

[0002] Highways and urban expressways are suitable for sections with dense heavy-load vehicles, such as freight lanes and toll booths. They can significantly reduce the rutting depth in hot seasons to less than 30% of traditional materials, extending the service life of the pavement to 8-10 years. Intersections and bus lanes are shear damage areas caused by frequent starting and stopping of vehicles, such as traffic lights, and various sections requiring heavy traffic. All pavements require the use of anti-rutting grouting materials.

[0003] After searching, the Chinese patent with patent publication number CN103554937A disclosed "anti-rutting agent, asphalt material containing the anti-rutting agent and preparation method" in the prior art, but it still has the following defects: (1) The existing anti-rutting grouting material binder has insufficient temperature resistance. Ordinary asphalt has a low softening point, ranging from 45 to 50°C. It is easy to soften under high temperatures in summer, which will cause the rutting depth left by vehicles to be deeper, and it is impossible to achieve an effective anti-rutting effect under high temperatures. (2) The aggregate grading of existing anti-rutting grouting materials is unreasonable, the proportion of coarse aggregate is low, and the skeleton support function is weak, resulting in insufficient shear resistance. In addition, the additive function is single and relies on a single modifier such as SBS material, which makes it difficult to take into account both high-temperature anti-rutting and low-temperature anti-cracking performance.

[0004] Therefore, we made improvements to this and proposed a preparation method for high-performance anti-rutting grouting material. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing material has a low softening temperature, easily leaves deeper ruts and has a single function.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: A preparation method of a high-performance anti-rutting grouting material is provided to improve the above problems.

[0007] The present invention is specifically as follows: the preparation method comprises the following steps: Step 1: Heat 70# road asphalt to 160-170℃, add SBS, and shear at 4000r / min for 30 minutes. Then add nano zinc oxide and coupling agent, and continue shearing for 15 minutes to form a homogeneous colloid. Step 2: Preheat the composite aggregate to 150°C and put it into a stirring kettle, add expanded vermiculite, stir at a low speed of 60r / min for 5 minutes, inject modified asphalt colloid, heat to 170°C, stir at a medium speed of 120r / min for 10 minutes, add rubber powder and carbon fiber, cool to 140°C, and stir at a low speed of 30r / min for 15 minutes to form a final mixture; Step 3: inject the final mixture into the mold, shape it under a pressure of 0.8-1.2 MPa, place it in a constant temperature box at 60°C for 48 hours, and naturally cool it to room temperature after demoulding to obtain the final product; As a preferred technical solution of the present invention, the modified asphalt colloid includes 70# road asphalt, styrene-butadiene-styrene block copolymer, nano zinc oxide and a coupling agent.

[0008] As a preferred technical solution of the present invention, the composite aggregate includes basalt coarse aggregate and machine-made sand.

[0009] As a preferred technical solution of the present invention, the functional additives include waste tire rubber powder, carbon fiber chopped strands and expanded vermiculite.

[0010] As a preferred technical solution of the present invention, the dosage of the nano zinc oxide is 1-2 parts, and the particle size is 30-50nm.

[0011] As a preferred technical solution of the present invention, the gradient mixing in step c includes stirring the modified asphalt and aggregate at a medium speed at 170°C for 10 minutes and stirring the rubber powder and carbon fiber at a low speed at 140°C for 15 minutes.

[0012] As a preferred technical solution of the present invention, the proportion of basalt coarse aggregate in the composite aggregate is 65-75 parts.

[0013] As a preferred technical solution of the present invention, 30-40 parts of recycled asphalt mixture can be added.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the solution of the present invention: 1. Through the synergistic modification of the added nano and rubber powder, nano zinc oxide improves the high-temperature stability of asphalt and effectively increases the softening point, while the rubber powder enhances the low-temperature toughness. At the same time, the modified asphalt, composite aggregate and composite aggregate raw materials are fully scattered inside the tank, so that the raw materials are more fully and evenly mixed. The synergistic modification of nano zinc oxide and rubber powder, the gradient mixing process and the compatible design of recycled materials achieve excellent performance of dynamic stability ≥8000 times / mm and low-temperature bending strain ≥3500με, thereby improving the anti-rutting performance of the grouting material.

[0015] 2. Through the gradient mixing process: the temperature and rotation speed are controlled in stages to avoid carbonization of rubber powder and fiber agglomeration. At the same time, the compatibility of recycled materials is utilized to incorporate recycled asphalt mixture. Carbon emissions are greatly reduced compared to traditional processes. By optimizing the raw material ratio and process design, the anti-rutting performance and durability are significantly improved. It is suitable for heavy-load traffic scenarios such as highways and airport runways. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic front view of a high-performance anti-rutting grouting material preparation device provided by the present invention; Figure 2 A schematic structural diagram of an injection assembly of a high-performance anti-rutting grouting material preparation device provided by the present invention; Figure 3 A schematic diagram of the structure of a high-performance anti-rutting grouting material preparation device provided by the present invention from a bottom view; Figure 4 A schematic diagram of the structure of a stirring assembly of a high-performance anti-rutting grouting material preparation device provided by the present invention; Figure 5 The present invention provides a high-performance anti-rutting grouting material preparation device Figure 4 Middle B is a schematic diagram of a partially enlarged structure; Figure 6 A schematic diagram of the heating component structure of a high-performance anti-rutting grouting material preparation device provided by the present invention; Figure 7 The present invention provides a high-performance anti-rutting grouting material preparation device Figure 6 A is a schematic diagram of the partially enlarged structure.

[0017] Indicated in the figure: 1. Tank body; 201. Feeding pipe; 202. Tube groove; 203. Embedded tube; 204. Ring groove; 205. Embedded ring; 206. Spreading plate; 207. Sleeve ring; 208. Feeding box; 209. First motor; 210. Toothed disc; 301. Second motor; 302. Tank groove; 303. Connecting rod; 304. Inner groove; 305. Electric rotating rod; 306. First bevel gear; 307. Second bevel gear; 308. Agitator; 401. Limiting groove; 402. Limiting ring; 403. Side groove; 404. Gear ring; 405. Gear roller; 406. Third motor; 407. Fixing ring; 408. Heater. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in 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 part of the embodiments of the present invention, not all of them.

[0019] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. Example

[0022] like Figure 1-7 As shown, this embodiment provides a method for preparing a high-performance anti-rutting grouting material, and the preparation method includes the following steps: Step 1: Heat 70# road asphalt to 160°C, add SBS, and shear at 4000r / min for 30 minutes. Then add nano zinc oxide and coupling agent, and continue shearing for 15 minutes to form a homogeneous colloid. Step 2: Preheat the composite aggregate to 150°C and put it into a stirring kettle, add expanded vermiculite, stir at a low speed of 60r / min for 5 minutes, inject modified asphalt colloid, heat to 170°C, stir at a medium speed of 120r / min for 10 minutes, add rubber powder and carbon fiber, cool to 140°C, and stir at a low speed of 30r / min for 15 minutes to form a final mixture; Step 3: inject the final mixture into the mold, shape it under a pressure of 0.8 MPa, place it in a constant temperature box at 60°C for 48 hours, and naturally cool it to room temperature after demoulding to obtain the final product; The modified asphalt colloid comprises 70# road asphalt, styrene-butadiene-styrene block copolymer, nano zinc oxide and a coupling agent.

[0023] Wherein, the composite aggregate includes basalt coarse aggregate and machine-made sand.

[0024] The functional additives include waste tire rubber powder, carbon fiber chopped strands and expanded vermiculite.

[0025] The nano zinc oxide is added in an amount of 1 part and has a particle size of 30 nm.

[0026] The gradient mixing in step c comprises stirring the modified asphalt and aggregate at a medium speed at 170° C. for 10 minutes and stirring the rubber powder and carbon fiber at a low speed at 140° C. for 15 minutes.

[0027] Among them, the proportion of basalt coarse aggregate in the composite aggregate is 65 parts.

[0028] Among them, 30 parts of recycled asphalt mixture can be added; Performance test results: dynamic stability: 8500 times / mm; Low temperature bending strain: 3800με; Water stability: residual stability 88%. Example

[0029] A method for preparing a high-performance anti-rutting grouting material, the preparation method comprising the following steps: Step 1: Heat 70# road asphalt to 170°C, add SBS, and shear at 4000r / min for 30 minutes. Then add nano zinc oxide and coupling agent, and continue shearing for 15 minutes to form a homogeneous colloid. Step 2: Preheat the composite aggregate to 150°C and put it into a stirring kettle, add expanded vermiculite, stir at a low speed of 60r / min for 5 minutes, inject modified asphalt colloid, heat to 170°C, stir at a medium speed of 120r / min for 10 minutes, add rubber powder and carbon fiber, cool to 140°C, and stir at a low speed of 30r / min for 15 minutes to form a final mixture; Step 3: inject the final mixture into the mold, shape it under a pressure of 1.2 MPa, place it in a constant temperature box at 60°C for 48 hours, and naturally cool it to room temperature after demoulding to obtain the final product; The modified asphalt colloid comprises 70# road asphalt, styrene-butadiene-styrene block copolymer, nano zinc oxide and a coupling agent.

[0030] Wherein, the composite aggregate includes basalt coarse aggregate and machine-made sand.

[0031] The functional additives include waste tire rubber powder, carbon fiber chopped strands and expanded vermiculite.

[0032] The nano zinc oxide is added in an amount of 2 parts and has a particle size of 40 nm.

[0033] The gradient mixing in step c comprises stirring the modified asphalt and aggregate at a medium speed at 170° C. for 10 minutes and stirring the rubber powder and carbon fiber at a low speed at 140° C. for 15 minutes.

[0034] Among them, the basalt coarse aggregate accounts for 75 parts of the composite aggregate.

[0035] Among them, 40 parts of recycled asphalt mixture can be added; Performance test results: dynamic stability 7800 times / mm, carbon emissions reduced by 52%; Low temperature bending strain: 3700με; Water stability: residual stability 85%. Example

[0036] A preparation device for high-performance anti-rutting grouting material, comprising a tank body 1, an injection assembly provided at the upper end of the tank body 1, a stirring assembly provided in the center of the tank body 1, and a heating assembly provided on the side wall of the lower end of the tank body 1; The injection assembly includes a feed pipe 201 arranged on the side wall of the upper end of the tank body 1, a pipe groove 202 is provided inside the feed pipe 201, an embedded pipe 203 is rotatably provided inside the pipe groove 202, a ring groove 204 is provided on the side wall of the pipe groove 202, and an embedded ring 205 that cooperates with the ring groove 204 is provided on the side wall of the embedded pipe 203. The embedded pipe 203 rotates in the pipe groove 202, and at the same time drives the feeding box 208 at the upper end to rotate and move to align with the discharge ports of different raw material tanks, so as to more conveniently receive raw materials discharged from different directions. At the same time, during the injection process, the spreading plate 206 at the lower end of the embedded pipe 203 is also driven to rotate; The stirring assembly includes a second motor 301 disposed on the lower central surface of the tank body 1. The upper end of the second motor 301 passes through the bottom of the tank body 1 and is cooperatively connected to a connecting rod 303. An inner groove 304 is formed inside the connecting rod 303. An electric rotating rod 305 is disposed in the center of the inner groove 304. The electric rotating rod 305 rotates through a first bevel gear 306 mounted on the outer wall to engage with the second bevel gears 307 on both sides to rotate. The rotation of the second bevel gears 307 drives the stirring rod 308 connected thereto to rotate in a direction perpendicular to the connecting rod 303, so that the stirring rod 308 stirs the added raw materials in the tank 302 horizontally and vertically. The heating component includes a limiting ring 402 arranged on the outer wall of the lower end of the tank body 1, a fixing ring 407 is mounted on the outside of the limiting ring 402, and a limiting groove 401 is provided inside the fixing ring 407 to cooperate with the limiting ring 402, so that the limiting ring 402 can rotate stably in the limiting groove 401, thereby driving the heater 408 symmetrically arranged at the front and back of the upper end to rotate around the tank body 1, providing a stable heating effect for the mixed raw materials inside the tank body 1.

[0037] like Figure 2 As shown, the injection assembly also includes a first motor 209 arranged on the upper end surface of the tank body 1 at the lateral position of the feed pipe 201, and the upper end of the first motor 209 is connected to a gear disk 210. The side wall of the embedded tube 203 at the upper side of the embedded ring 205 is sleeved with a ring 207 that cooperates with the gear disk 210. The operation of the first motor 209 drives the gear disk 210 connected thereto to rotate, and drives the ring 207 to rotate through the engagement of the side wall teeth.

[0038] like Figure 5As shown, the outer wall of the electric rotating rod 305 is provided with a first bevel gear 306, and the inner walls on both sides of the inner groove 304 are provided with second bevel gears 307 that cooperate with the first bevel gear 306. The rotation of the electric rotating rod 305 drives the second bevel gears 307 on both sides to rotate through the engagement of the first bevel gear 306 set on the outer wall. The rotation of the second bevel gear 307 drives the stirring rod 308 connected to it to rotate in a direction perpendicular to the connecting rod 303.

[0039] like Figure 7 As shown, a side groove 403 is opened on the lateral side wall of the limiting ring 402, and a gear ring 404 is arranged inside the side groove 403. The third motor 406 drives the gear roller 405 connected thereto to rotate so that it engages relatively with the surface of the gear ring 404.

[0040] like Figure 7 As shown, the horizontal inner wall of the limiting groove 401 is provided with a gear roller 405 that cooperates with the gear ring 404, and the upper end of the gear roller 405 is connected to the third motor 406. The gear roller 405 rotates so that it is relatively engaged with the surface of the gear ring 404, so that the limiting ring 402 can rotate stably in the limiting groove 401, which can drive the heater 408 symmetrically arranged at the front and back of the upper end to rotate around the tank body 1.

[0041] like Figure 1 As shown, the upper surface of the fixing ring 407 is symmetrically provided with a heater 408 , and the fixing ring 407 can drive the heater 408 symmetrically provided on the upper end to rotate around the tank body 1 .

[0042] like Figure 2 As shown, the lower side wall of the embedded tube 203 is equipped with a spreading plate 206, and the upper side wall of the embedded tube 203 is equipped with a feeding box 208. The embedded tube 203 rotates in the tube groove 202, and at the same time drives the feeding box 208 at the upper end to rotate and move to align with the discharge ports of different raw material tanks, so as to more conveniently receive raw materials discharged from different directions.

[0043] like Figure 2 As shown, the cross-sectional dimensions of the tube groove 202 match those of the embedded tube 203 , so that the embedded tube 203 can rotate stably in the tube groove 202 .

[0044] like Figure 4 As shown, the outer end of the second bevel gear 307 is connected to a stirring rod 308. The rotation of the second bevel gear 307 drives the stirring rod 308 connected thereto to rotate in a direction perpendicular to the connecting rod 303, so that the stirring rod 308 stirs the added raw materials in the tank 302 horizontally and vertically.

[0045] Specifically, when the present preparation equipment is in operation: it is necessary to add a variety of raw materials for mixing. During the adding process, the first motor 209 is controlled to operate to drive the toothed disc 210 connected thereto to rotate, and the sleeve ring 207 is driven to rotate through the meshing of the side wall teeth. Under the limit of the embedded ring 205 embedded in the annular groove 204, the embedded tube 203 is rotated in the tube groove 202, and at the same time, the feeding box 208 at the upper end is driven to rotate and move to align with the discharge ports of different raw material tanks, so as to more conveniently receive raw materials discharged from different directions. At the same time, during the injection process, the spreading plate 206 at the lower end of the embedded tube 203 is also driven to rotate. During the discharge process, the spreading plate 206 rotates to fully sprinkle the modified asphalt, composite aggregate and composite aggregate raw materials inside the tank body 1, so that the raw materials are more fully and evenly mixed. During the stirring process, the second motor 301 is controlled to operate to drive the connecting rod 303 connected thereto to rotate, which can bring The dynamic stirring rod 308 rotates horizontally with the connecting rod 303 as the axis, and at the same time controls the electric rotating rod 305 to rotate through the first bevel gear 306 set on the outer wall to engage and drive the second bevel gears 307 on both sides to rotate. The rotation of the second bevel gear 307 drives the stirring rod 308 connected thereto to rotate in the direction perpendicular to the connecting rod 303, so that the stirring rod 308 stirs the added raw materials horizontally and vertically in the tank 302, thereby improving the sufficient stirring. In the process of mixing the raw materials, the third motor 406 is controlled to operate and drive the toothed roller 405 connected thereto to rotate so that it engages relatively on the surface of the gear ring 404, so that the limiting ring 402 rotates relatively stably in the limiting groove 401, and the fixed ring 407 can drive the heater 408 symmetrically arranged front and back at the upper end to rotate around the tank body 1, providing a stable heating effect to the mixed raw materials inside the tank body 1, and providing an effective temperature for the mixing environment.

[0046] All technical features in this embodiment can be freely combined according to actual needs.

[0047] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A method for preparing a high-performance anti-rutting grouting material, characterized in that: The preparation method comprises the following steps: Step 1: Heat 70# road asphalt to 160-170℃, add SBS, and shear at 4000r / min for 30 minutes. Then add nano zinc oxide and coupling agent, and continue shearing for 15 minutes to form a homogeneous colloid. Step 2: Preheat the composite aggregate to 150°C and put it into a stirring kettle, add expanded vermiculite, stir at a low speed of 60r / min for 5 minutes, inject modified asphalt colloid, heat to 170°C, stir at a medium speed of 120r / min for 10 minutes, add rubber powder and carbon fiber, cool to 140°C, and stir at a low speed of 30r / min for 15 minutes to form a final mixture; Step 3: inject the final mixture into the mold, shape it under a pressure of 0.8-1.2 MPa, place it in a constant temperature box at 60°C for 48 hours, and naturally cool it to room temperature after demolding to obtain the final product.

2. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The modified asphalt colloid comprises 70# road asphalt, styrene-butadiene-styrene block copolymer, nano zinc oxide and a coupling agent.

3. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The composite aggregate comprises basalt coarse aggregate and machine-made sand.

4. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The functional additives include waste tire rubber powder, carbon fiber chopped strands and expanded vermiculite.

5. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The dosage of the nano zinc oxide is 1-2 parts, and the particle size is 30-50nm.

6. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The gradient mixing in step c includes stirring the modified asphalt and aggregate at a medium speed at 170° C. for 10 minutes and stirring the rubber powder and carbon fiber at a low speed at 140° C. for 15 minutes.

7. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The basalt coarse aggregate accounts for 65-75 parts of the composite aggregate.

8. The method for preparing a high-performance anti-rutting grouting material according to claim 1, characterized in that: The above-mentioned mixture may be mixed with 30-40 parts of recycled asphalt.

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