Asphalt mixture capable of resisting pavement icing as well as preparation method and equipment of asphalt mixture

Abstract

The invention discloses an asphalt mixture capable of resisting pavement icing as well as a preparation method and equipment thereof, and belongs to the technical field of asphalt concrete.The asphalt mixture is prepared from the following components in parts by weight: 50-70 parts of 70 # base asphalt; 25 to 40 parts of aggregate; 10 to 30 parts of styrene-butadiene latex; 10 to 20 parts of polydimethylsiloxane; 5 to 10 parts of nano silicon dioxide; 2-8 parts of an anti-freezing agent; and 1-3 parts of a self-repairing agent. According to the invention, a super-hydrophobic design concept is introduced, styrene-butadiene latex, polydimethylsiloxane, nano silicon dioxide and a self-repairing agent are mixed, and the hydrophobic SBR rubber phase change material with hydrophobic and anti-freezing performance is prepared, so that the hydrophobic performance of the SBR rubber phase change material is improved. The prepared pavement icing resistant asphalt mixture has good hydrophobicity, water is not easy to stay in and on the surface of the asphalt concrete, the surface or the interior of the asphalt concrete is not easy to freeze at a low temperature, and the wear resistance and the friction resistance of the asphalt concrete can be ensured.

Description

Technical Field

[0001] The invention relates to an asphalt mixture for resisting road icing and a preparation method and equipment thereof, belonging to the technical field of asphalt concrete. Background Art

[0002] Asphalt pavement has the advantages of high flatness, low noise, and good driving comfort. It is the main type of pavement in road construction and is widely used in highways, urban roads, airport runways, etc. Under low temperature conditions, precipitation on asphalt pavement can easily cause pavement icing. The bonding force between asphalt concrete binder and aggregate and the strength of asphalt mixture will be greatly reduced at low temperatures, resulting in direct or indirect damage to the pavement. It not only affects the performance and safety of the pavement, but also increases the maintenance cost. Once freezing occurs, the pavement's anti-skid performance decreases, causing safety hazards. At present, most traditional pavement deicing methods emphasize post-deicing, such as artificial deicing, chemical deicing, and conductive concrete deicing. However, these traditional deicing methods all have certain shortcomings, such as the large workload of artificial deicing, the easy erosion of the pavement by chemical deicing, and the high energy consumption of conductive concrete deicing. Therefore, it is of great significance to study and develop an asphalt mixture that can effectively resist pavement icing and apply it to road construction in cold or high-altitude areas to improve the quality of road engineering and reduce safety hazards.

[0003] The difficulty in removing the ice layer on the asphalt road surface is that after the snow on the road surface turns into water, it freezes at low temperatures to form pins that embed into the surface gaps of the asphalt pavement, forming a high interface strength between the ice layer on the road surface and the road surface, making it difficult to remove it with deicing equipment. Therefore, if the interface strength between the ice layer on the road surface and the road surface can be reduced, the ice layer can be quickly detached from the surface of the asphalt pavement under the action of vehicle load or mechanical snow removal equipment, and further broken under the action of external force, thereby quickly removing the ice layer on the road surface. At the same time, according to the basic principle of ice damage on asphalt pavements, if the ice water content can be effectively reduced to prevent the accumulation of ice water inside and outside the road surface, the anti-icing performance of the asphalt pavement can also be effectively improved.

[0004] Adding rubber particles to the asphalt pavement mixture will cause a large number of rubber particles to be distributed around the aggregate on the road surface. Due to the presence of rubber particles, the road surface will be uneven when it freezes, which will reduce the overall strength of the ice. In addition, due to the large difference in stiffness between rubber particles and aggregates, when a vehicle passes over the road surface and applies dynamic loads to the road surface, the rubber particles will undergo a large deformation due to their strong elastic deformation ability, while the aggregate of the mixture will hardly deform due to its strong rigidity. After superposition, the ice layer is unevenly stressed, so stress concentration will occur between the rubber particles and the aggregate. The ice layer here is very easy to destroy. In addition, the rubber particles will reduce the adhesion between the road surface and the ice layer, making it easy to remove the ice.

[0005] There are many research reports on the application of phase change material rubber to asphalt mixture to achieve anti-icing of road surface, such as: Zhong et al. (Zhong K, Sun M Z. Performance evaluation of high-elastic / salt-storage asphalt mixture modified with Mafilon and rubber particles [J]. Construction and Building Materials, 2018, 193: 153-161.) used rubber particles to replace part of the fine aggregate and designed a self-stress deicing effect. The test results show that replacing part of the fine aggregate with rubber particles can improve the deicing performance of asphalt mixture by 5 times. Xiao Qingyi et al. (Xiao Qingyi, Liu Meitong et al. Study on the ice-breaking mechanism of asphalt pavement embedded rubber block paving structure [J]. Journal of Wuhan University of Technology (Transportation Science and Engineering Edition), 2014, 38 (05): 1022-1025) proposed two types of asphalt pavement rubber block embedded paving structures: orthogonal and transverse staggered according to the characteristics of vehicle load distribution. By calculating the stress and strain values ​​of the ice layer under load, it is found that the orthogonal and transverse staggered distribution of rubber blocks can make the shear strain failure and tensile strain failure of the ice layer on the surface of the mixture reach the peak at the rubber particles, thereby achieving self-stress ice breaking. Chen Yuanzhao et al. (Chen Yuanzhao, Li Zhenxia. Deicing mechanism of rubber particle asphalt pavement [J]. Journal of Central South University (Natural Science Edition), 2013, 44(05): 2073-2081.) proposed the strain energy density factor criterion as the basis for judging ice layer damage, and found through indoor simulation tests that the main form of road ice layer damage is mixed fracture damage. The cracks generated by the composite fracture damage extend radially outward, and the ice is locally broken under the repeated action of vehicle load. Although asphalt pavement with rubber materials can achieve deicing of thin ice-covered roads, the deicing effect of rubber particles alone is not good. Because the hydrophobicity of rubber materials is weak, when the accumulated water gradually increases, the ice layer becomes thicker and it is difficult to achieve active removal.

[0006] Therefore, in order to eliminate the hidden dangers of snow and ice on the road, in view of the current status of anti-ice road asphalt mixture, it is urgent to enhance the hydrophobicity of rubber asphalt and design an asphalt mixture with hydrophobic and anti-icing properties. Summary of the invention

[0007] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide an anti-ice asphalt mixture with good stability and the ability to enhance the hydrophobic and anti-icing properties of asphalt pavements, and a preparation method and equipment thereof.

[0008] To achieve the above object, the technical solution of the present invention is as follows: The first technical purpose of the present invention is to provide an asphalt mixture for resisting road icing, which is prepared from the following components in parts by weight: 50-70 parts of No. 70 base asphalt; Aggregate 25-40 parts; 10-30 parts of styrene-butadiene latex; 10-20 parts of polydimethylsiloxane; 5-10 parts of nano silicon dioxide; 2 to 8 parts of anti-icing agent; 1 to 3 parts of self-healing agent.

[0009] The No. 70 base asphalt is the commercially available Karamay No. 70 (KLM70) asphalt, and the styrene-butadiene latex, polydimethylsiloxane and nano-silicon dioxide are commercially available products.

[0010] Preferably, the aggregate is any one of manganese slag powder, limestone powder, fly ash or a mixture of several of them, and the particle size is ≤2.35mm.

[0011] Preferably, the anti-icing agent is any one of sodium chloride, magnesium chloride, and calcium oxide.

[0012] Preferably, the self-healing agent is any one of calcium sulphoaluminate, polyvinyl alcohol fiber, nano-scale carbon black, and polyacrylonitrile-based carbon fiber, or a mixture of several of them.

[0013] The second technical purpose of the present invention is to provide a method for preparing an asphalt mixture that resists road icing, comprising the following steps: S1: Preparation of hydrophobic SBR rubber phase change material; According to the ratio, weigh butadiene styrene latex, polydimethylsiloxane, nano-silica and self-healing agent accounting for 30% of the total amount of the self-healing agent, add them into the mixing tank in turn and mix evenly, add them into the internal mixer and mix them at a temperature of 120-200°C for 0.5-3h to obtain a rubber compound; the mixed rubber compound is hot-pressed into a sheet by a calender, and subsequently the sheet is stacked into the required thickness by a calender according to the needs, and then secondary calendering is performed to obtain a rubber sheet, which is crushed and set aside.

[0014] S2: Preparation of asphalt mixture for resistant road icing; Karamay 70# (KLM70) asphalt, aggregate, and anti-icing agent accounting for 70% of the total amount of the self-repairing agent are sequentially added to the mixing tank and mixed evenly, stirred evenly at a speed of 150-300r / min at normal temperature and pressure, heated to 80-130°C, and stirred at a speed of 200-300r / min for 0.5h to obtain the asphalt mixture for resisting road icing; The hot pressing molding pressure of the calender in step 1 is 5-20 MPa, and the thickness of the sheet is 0.2-1.0 mm.

[0015] Another object of the present invention is to provide an apparatus for preparing the method for preparing the asphalt mixture for resisting road icing. The calender used in S1 includes a base, and the inner cavity of the base is equipped with a first roller, a second roller and a third roller. The first roller is located on one side of the second roller, and the third roller is located below the second roller. A rubber baffle is arranged between the first roller and the second roller. The position of the third roller is adjusted by an adjustment mechanism, and the third roller is rotated by a rotation mechanism. The position of the rubber baffle is adjusted by an installation mechanism. The adjustment mechanism includes a first movable groove and a second movable groove. The first movable groove and the second movable groove are respectively opened at two ends of the base. The inner wall of the first movable groove is slidably connected with a first movable block, and the inner wall of the second movable groove is slidably connected with a second movable block. The two ends of the third roller are rotatably connected with the first movable block and the second movable block. A first motor is installed at the top of the base, and the output end of the first motor is connected with a first threaded rod, and the first threaded rod passes through the first movable block. The inner wall of the second movable groove is fixedly connected with a limit rod passing through the second movable block.

[0016] As a further scheme of the present invention: the rotating mechanism includes a mounting frame, the mounting frame is fixedly connected to the outer wall of the base, one side of the mounting frame is fixedly connected to the supporting frame, the outer wall of the mounting frame is installed with a second motor, the output end of the second motor is connected with a first spur gear, the first spur gear is fixedly connected to the first roller, one end of the second roller is fixedly connected to the second spur gear, the second spur gear contacts the first spur gear, one end of the second spur gear is fixedly connected to a third bevel gear, the outer wall of the third bevel gear is provided with a fourth bevel gear, the third bevel gear is rotatably connected to the supporting frame, the bottom end of the fourth bevel gear is fixedly connected to a square rod, one end of the third roller is fixedly connected to the first bevel gear, the interior of the second movable block is located at the outer wall of the first bevel gear and is rotatably connected to the second bevel gear, and the square rod passes through the second bevel gear.

[0017] As a further scheme of the present invention: the mounting mechanism includes a side plate, the side plate is symmetrically connected to the top of the base, a support rod is fixedly connected between the two side plates, the outer wall of the side plate is located below the support rod and is rotatably connected to a second threaded rod, and two ends of the second threaded rod are fixedly connected to a rotating block, the outer walls of the support rod and the second threaded rod are slidably connected to a displacement plate, the outer wall of the displacement plate is provided with a connecting groove, the inner wall of the connecting groove is provided with a fixing groove, the outer wall of the rubber baffle plate is fixedly connected to a connecting block, the inner part of the connecting block is slidably connected to a fixed block extending to the outside of the connecting block, a first spring is connected between the fixed block and the connecting block, the inner part of the connecting block is located at one side of the fixed block and is slidably connected to a lower pressure seat, the inner part of the lower pressure seat is slidably connected to a cross bar extending from the lower pressure seat, the cross bar is connected to a second spring between the lower pressure seat, the inner part of the lower pressure seat is located at the bottom end of the cross bar and is rotatably connected to a third spur gear, and the inner part of the lower pressure seat is located at the bottom end of the third spur gear and is slidably connected to a push rod, and the push rod extends out of the lower pressure seat.

[0018] As a further solution of the present invention: the inner wall of the first movable groove fits with the outer wall of the first movable block, the inner wall of the second movable groove fits with the outer wall of the second movable block, the outer wall of the first movable block is provided with a first threaded hole, and the first threaded hole matches the first threaded rod.

[0019] As a further solution of the present invention: the first spur gear is meshed with the second spur gear, the third bevel gear is meshed with the fourth bevel gear, the first bevel gear is meshed with the second bevel gear, the outer wall of the second bevel gear is provided with a square groove, and the inner wall of the square groove is in contact with the outer wall of the square rod.

[0020] As a further solution of the present invention: a second threaded hole is formed on the outer wall of the displacement plate, and external threads are symmetrically formed on the outer wall of the second threaded rod, and the external threads match the second threaded hole.

[0021] As a further solution of the present invention: the inner wall of the connecting groove fits with the outer wall of the connecting block, the inner wall of the fixing groove fits with the outer wall of the fixing block, the outer wall of the lower pressure seat is fixedly connected with a vertical block, the interior of the connecting block is provided with a vertical groove for the vertical block to slide, the outer walls of the cross bar and the push rod are provided with tooth grooves, and the tooth grooves are meshed with the third spur gear.

[0022] Compared with the existing detection technology, the beneficial effects of the present invention are embodied in:

[0023] 1. The preparation of the asphalt mixture for resisting road icing of the present invention introduces the super-hydrophobic design concept, mixes styrene-butadiene latex, polydimethylsiloxane, nano-silica and self-repairing agent, and prepares a hydrophobic SBR rubber phase change material with hydrophobic anti-icing performance, thereby improving the hydrophobic performance of the SBR rubber phase change material. The prepared asphalt mixture for resisting road icing has good hydrophobicity, water is not easy to stay inside and on the surface of asphalt concrete, and when the temperature is low, the surface or inside of asphalt concrete is not easy to freeze, which can ensure the wear resistance and friction resistance of asphalt concrete.

[0024] 2. The preparation of the asphalt mixture for resisting road icing of the present invention is to prepare the asphalt mixture for resisting road icing at normal temperature and pressure using hydrophobic SBR rubber phase change material, base asphalt, aggregate, anti-icing agent and repair agent. Under the action of sudden change stress, the self-repairing agent enters the microcracks and fills the microcracks, which plays a self-repairing role for the asphalt mixture, and is beneficial to the improvement of the anti-cracking performance and service life of the asphalt mixture. The preparation method is simple and easy, and is suitable for large-scale industrial production and application.

[0025] 3. The calender of the present invention is provided with an adjusting mechanism, a rotating mechanism and an installing mechanism. The first motor operates to adjust the gap between the second roller and the third roller, and adjusts the thickness of the calendered sheet; the second motor operates to drive the first roller, the second roller and the third roller to rotate synchronously, which is convenient for the calendering operation; the rotating block drives the second threaded rod to rotate, and drives the rubber baffle to move, which is convenient for rapid adjustment of the position of the rubber baffle, and rapid installation and disassembly of the rubber baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the calender of the present invention; Figure 2 It is a schematic diagram of the installation of the first movable block and the second movable block of the calender of the present invention; Figure 3 It is a schematic diagram of the internal structure of the second movable block of the calender of the present invention; Figure 4 It is a schematic structural diagram of the second bevel gear of the calender of the present invention; Figure 5 It is a schematic diagram of the installation of the displacement plate of the calender of the present invention; Figure 6 It is a schematic diagram of the internal structure of the displacement plate of the calender of the present invention; Figure 7 It is a schematic diagram of the internal structure of the connecting block of the calender of the present invention; Figure 8 It is a schematic diagram of the internal structure of the lower pressing seat of the calender of the present invention.

[0027] In the figure: 1, base; 2, first roller; 3, second roller; 4, third roller; 5, rubber baffle; 6, adjustment mechanism; 601, first movable groove; 602, second movable groove; 603, first movable block; 604, second movable block; 605, first motor; 606, first threaded rod; 607, limit rod; 7, rotating mechanism; 701, mounting frame; 702, support frame; 703, second motor; 704, first spur gear; 705, second spur gear; 706, first bevel gear; 707, second bevel gear Wheel; 708, third bevel gear; 709, fourth bevel gear; 710, square rod; 8, mounting mechanism; 801, side plate; 802, support rod; 803, second threaded rod; 804, rotating block; 805, displacement plate; 806, connecting groove; 807, fixing groove; 808, connecting block; 809, fixing block; 810, first spring; 811, lower pressure seat; 812, cross bar; 813, second spring; 814, third spur gear; 815, pushing rod; 9, square groove; 10, vertical block; 11, vertical groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0030] Example 1: Preparation of an asphalt mixture for resisting road icing See also Figures 1 to 7 In an embodiment of the present invention, an asphalt mixture for resisting road icing is prepared from the following components in parts by weight: 60 parts of No. 70 base asphalt; Aggregate 33 parts; 20 parts of styrene-butadiene latex; 15 parts of polydimethylsiloxane; 8 parts of nano silicon dioxide; 6 parts of sodium chloride; 1.5 parts of calcium sulphoaluminate; The No. 70 base asphalt is Karamay 70# (KLM70), styrene-butadiene latex, polydimethylsiloxane and nano-silicon dioxide are commercially available products, and the aggregates are premixed powders of manganese slag powder, limestone powder and fly ash, with a particle size of ≤2.35mm.

[0031] A method for preparing an asphalt mixture for resisting road icing comprises the following steps: S1: Preparation of hydrophobic SBR rubber phase change material According to the proportion, styrene-butadiene latex, polydimethylsiloxane, nano-silicon dioxide and calcium sulfoaluminate accounting for 30% of the total amount of the self-healing agent are weighed and added to a mixing tank in sequence, mixed evenly, added to a banbury mixer for refining at a temperature of 120 to 200° C. for 0.5 to 3 hours to obtain a rubber mixture; the mixed rubber mixture is hot-pressed into a sheet by a calender, and subsequently the sheet is stacked into a desired thickness by a calender according to the needs, and then a rubber sheet is obtained by secondary calendering, which is crushed for standby use; S2: Preparation of asphalt mixture to resist road icing Add Karamay 70# (KLM70) asphalt, aggregate, anti-icing agent sodium chloride and self-repairing agent accounting for 70% of the total amount of self-repairing agent calcium sulfoaluminate into the mixing tank in turn and mix evenly. Stir evenly at a speed of 150-300r / min at normal temperature and pressure. Heat to 80-130℃, stir at a speed of 200-300r / min for 0.5h to obtain an asphalt mixture that resists road icing.

[0032] The hot pressing molding pressure of the calender in step 1 is 5-20 MPa, and the thickness of the sheet is 0.2-1.0 mm.

[0033] A device used in the method for preparing the asphalt mixture for resisting road icing, the calender used in S1 includes a base 1, the inner cavity of the base 1 is equipped with a first roller 2, a second roller 3 and a third roller 4, the first roller 2 is located on one side of the second roller 3, the third roller 4 is located below the second roller 3, a rubber baffle 5 is arranged between the first roller 2 and the second roller 3, the position of the third roller 4 is adjusted by an adjusting mechanism 6, the third roller 4 is rotated by a rotating mechanism 7, and the position of the rubber baffle 5 is adjusted by a mounting mechanism 8.

[0034] Please refer to Figures 1 to 3 The adjusting mechanism 6 includes a first movable groove 601 and a second movable groove 602, which are respectively arranged at two ends of the base 1, the inner wall of the first movable groove 601 is slidably connected with a first movable block 603, the inner wall of the second movable groove 602 is slidably connected with a second movable block 604, both ends of the third roller 4 are rotatably connected with the first movable block 603 and the second movable block 604, a first motor 605 is installed at the top of the base 1, the output end of the first motor 605 is connected with a first threaded rod 606, the first threaded rod 606 passes through the first movable block 603, and the inner wall of the second movable groove 602 is fixedly connected with a limiting rod 607 passing through the second movable block 604.

[0035] In this embodiment: the rubber mixture is placed between the first roller 2 and the second roller 3, and after preliminary extrusion, it is calendered between the second roller 3 and the third roller 4. When the position of the third roller 4 is adjusted, the first motor 605 is started, and the first motor 605 drives the first threaded rod 606 to rotate. The rotation of the first threaded rod 606 drives the first movable block 603 to slide in the first movable groove 601. The displacement of the first movable block 603 drives the third roller 4 to perform a displacement operation, thereby adjusting the gap between the second roller 3 and the third roller 4, and adjusting the thickness of the calendered sheet.

[0036] Please refer to Figures 2 to 4The rotating mechanism 7 includes a mounting frame 701, which is fixedly connected to the outer wall of the base 1, and a support frame 702 is fixedly connected to one side of the mounting frame 701. A second motor 703 is installed on the outer wall of the mounting frame 701, and an output end of the second motor 703 is connected to a first spur gear 704, the first spur gear 704 is fixedly connected to the first roller 2, and one end of the second roller 3 is fixedly connected to a second spur gear 705, and the second spur gear 705 contacts the first spur gear 704, and one end of the second spur gear 705 is fixedly connected to a third bevel gear 708, and a fourth bevel gear 709 is provided on the outer wall of the third bevel gear 708, and the third bevel gear 708 is rotatably connected to the support frame 702, and a square rod 710 is fixedly connected to the bottom end of the fourth bevel gear 709, and one end of the third roller 4 is fixedly connected to the first bevel gear 706, and the inner part of the second movable block 604 is located at the outer wall of the first bevel gear 706 and is rotatably connected to the second bevel gear 707, and the square rod 710 runs through the second bevel gear 707.

[0037] In this embodiment: the second motor 703 is started, and the second motor 703 runs to drive the first spur gear 704 to rotate, the first spur gear 704 rotates to drive the second spur gear 705 to rotate, the second spur gear 705 rotates to drive the third bevel gear 708 to rotate, the third bevel gear 708 rotates to drive the fourth bevel gear 709 to rotate, the fourth bevel gear 709 rotates to drive the square rod 710 to rotate, the square rod 710 rotates to drive the second bevel gear 707 to rotate, the second bevel gear 707 rotates to drive the first bevel gear 706 to rotate, the first spur gear 704 rotates to drive the first roller 2 to rotate, the second spur gear 705 rotates to drive the second roller 3 to rotate, the first bevel gear 706 rotates to drive the third roller 4 to rotate, thereby driving the first roller 2, the second roller 3 and the third roller 4 to rotate synchronously.

[0038] Please refer to Figures 5 to 8The mounting mechanism 8 includes a side plate 801, which is symmetrically connected to the top of the base 1. A support rod 802 is fixedly connected between the two side plates 801. The outer wall of the side plate 801 is located below the support rod 802 and is rotatably connected to a second threaded rod 803. Both ends of the second threaded rod 803 are fixedly connected to a rotating block 804. The outer walls of the support rod 802 and the second threaded rod 803 are slidably connected to a displacement plate 805. A connecting groove 806 is provided on the outer wall of the displacement plate 805. A fixing groove 807 is provided on the inner wall of the connecting groove 806. A connecting block 808 is fixedly connected to the outer wall of the rubber baffle plate 5. The inner wall of the connecting block 808 is slidably connected to an extension To the fixed block 809 outside the connecting block 808, a first spring 810 is connected between the fixed block 809 and the connecting block 808, the interior of the connecting block 808 is located on one side of the fixed block 809 and is slidably connected to a lower pressure seat 811, the interior of the lower pressure seat 811 is slidably connected to a cross bar 812 extending from the lower pressure seat 811, a second spring 813 is connected between the cross bar 812 and the lower pressure seat 811, the interior of the lower pressure seat 811 is located at the bottom end of the cross bar 812 and is rotatably connected to a third spur gear 814, the interior of the lower pressure seat 811 is located at the bottom end of the third spur gear 814 and is slidably connected to a push rod 815, and the push rod 815 extends from the lower pressure seat 811.

[0039] In this embodiment: when the position of the rubber baffle plate 5 is adjusted, the rotating block 804 is rotated, the rotating block 804 rotates to drive the second threaded rod 803 to rotate, the second threaded rod 803 rotates to drive the displacement plate 805 to move, and the displacement of the displacement plate 805 drives the rubber baffle plate 5 to move; When installing the rubber baffle 5, the push rod 815 is pushed to move, and the push rod 815 is moved to drive the third spur gear 814 to rotate, and the rotation of the third spur gear 814 drives the cross bar 812 to move, causing the second spring 813 to be squeezed, and the cross bar 812 is moved to separate from the bottom end of the fixed block 809, and the positioning of the fixed block 809 is cancelled. Then, the connecting block 808 is inserted into the connecting groove 806, and the fixed block 809 is engaged into the fixed groove 807 by the elastic force of the first spring 810, and then the push rod 815 is released, and the cross bar 812 is moved by the elastic force of the second spring 813 to contact with the bottom end of the fixed block 809, and the fixed block 809 is fixed, thereby completing the installation of the rubber baffle 5; When removing the rubber baffle plate 5, the pushing rod 815 is pushed to move the cross bar 812 to separate from the fixed block 809, and then the lower pressure seat 811 is pushed to move upward. After completion, the pushing rod 815 is released, and the cross bar 812 is reset to contact the bottom top of the fixed block 809, pushing the lower pressure seat 811 downward. The lower pressure seat 811 is displaced through the cross bar 812 to push the fixed block 809 to move downward, and the fixed block 809 moves out of the fixing groove 807, canceling the fixation of the connecting block 808, and taking the connecting block 808 out of the connecting groove 806, and the rubber baffle plate 5 is removed, which is convenient for quickly adjusting the position of the rubber baffle plate 5 and convenient for quickly installing and disassembling the rubber baffle plate 5.

[0040] Please refer to Figures 1 to 3 The inner wall of the first movable groove 601 fits with the outer wall of the first movable block 603 , the inner wall of the second movable groove 602 fits with the outer wall of the second movable block 604 , and the outer wall of the first movable block 603 is provided with a first threaded hole, which matches the first threaded rod 606 .

[0041] In this embodiment, the operation of the first motor 605 drives the first threaded rod 606 to rotate, and the rotation of the first threaded rod 606 drives the first movable block 603 to slide in the first movable groove 601, and the displacement of the first movable block 603 drives the third roller 4 to perform a displacement operation.

[0042] Please refer to Figures 2 to 4 The first spur gear 704 is meshed with the second spur gear 705 , the third bevel gear 708 is meshed with the fourth bevel gear 709 , the first bevel gear 706 is meshed with the second bevel gear 707 , and the outer wall of the second bevel gear 707 is provided with a square groove 9 , and the inner wall of the square groove 9 is in contact with the outer wall of the square rod 710 .

[0043] In this embodiment: the operation of the second motor 703 drives the first spur gear 704 to rotate, the rotation of the first spur gear 704 drives the second spur gear 705 to rotate, the rotation of the second spur gear 705 drives the third bevel gear 708 to rotate, the rotation of the third bevel gear 708 drives the fourth bevel gear 709 to rotate, the rotation of the fourth bevel gear 709 drives the square rod 710 to rotate, the rotation of the square rod 710 drives the second bevel gear 707 to rotate, and the rotation of the second bevel gear 707 drives the first bevel gear 706 to rotate.

[0044] Please refer to Figures 4 to 8 A second threaded hole is formed on the outer wall of the displacement plate 805, and external threads are symmetrically formed on the outer wall of the second threaded rod 803, and the external threads match the second threaded hole.

[0045] In this embodiment, the rotating block 804 is rotated, the rotating block 804 drives the second threaded rod 803 to rotate, the second threaded rod 803 drives the displacement plate 805 to displace, and the displacement of the displacement plate 805 drives the rubber baffle plate 5 to displace.

[0046] Please refer to Figures 4 to 8 The inner wall of the connecting groove 806 fits with the outer wall of the connecting block 808, the inner wall of the fixing groove 807 fits with the outer wall of the fixing block 809, the outer wall of the lower pressure seat 811 is fixedly connected with the vertical block 10, and the interior of the connecting block 808 is provided with a vertical groove 11 for the vertical block 10 to slide, and the outer walls of the cross bar 812 and the push rod 815 are provided with tooth grooves, which mesh with the third spur gear 814.

[0047] In this embodiment: pushing the push rod 815 to move the cross bar 812 and separate it from the fixed block 809, and then pushing the lower pressure seat 811 to move upward, after completion, release the push rod 815, the cross bar 812 resets and contacts the bottom top of the fixed block 809, pushing the lower pressure seat 811 downward, the lower pressure seat 811 moves through the cross bar 812 to push the fixed block 809 to move downward, the fixed block 809 moves out of the fixed groove 807, cancels the fixation of the connecting block 808, takes the connecting block 808 out of the connecting groove 806, and removes the rubber baffle 5.

[0048] Example 2: Preparation of an asphalt mixture for resisting road icing An asphalt mixture for resisting road icing is prepared from the following components in parts by weight: 50 parts of No. 70 base asphalt; Aggregate 25 parts; 10 parts of styrene-butadiene latex; 10 parts of polydimethylsiloxane; 5 parts of nano silicon dioxide; 2 parts of magnesium chloride; 1 part of polyvinyl alcohol fiber.

[0049] The No. 70 base asphalt is Karamay 70# (KLM70), styrene-butadiene latex, polydimethylsiloxane and nano-silicon dioxide are commercially available products, and the aggregates are premixed powders of manganese slag powder, limestone powder and fly ash, with a particle size of ≤2.35mm.

[0050] The preparation method and application equipment are the same as those in Example 1 and will not be described in detail here.

[0051] Example 3: Preparation of an asphalt mixture for resisting road icing An asphalt mixture for resisting road icing is prepared from the following components in parts by weight: 70 parts of No. 70 base asphalt; Aggregate 40 parts; 30 parts of styrene-butadiene latex; 20 parts of polydimethylsiloxane; 10 parts of nano silicon dioxide; Calcium chloride 8 parts; 3 parts of polyacrylonitrile-based carbon fiber.

[0052] The No. 70 base asphalt is Karamay 70# (KLM70), styrene-butadiene latex, polydimethylsiloxane and nano-silicon dioxide are commercially available products, and the aggregates are premixed powders of manganese slag powder, limestone powder and fly ash, with a particle size of ≤2.35mm.

[0053] The preparation method and application equipment are the same as those in Example 1 and will not be described in detail here.

[0054] Performance testing and characterization:

[0055] 1. Road performance test: According to the method specified in the "Highway Engineering Asphalt and Asphalt Mixture Test Procedure", the asphalt mixture prepared in Examples 1-3 was marked as Sample 1-3 and tested for road performance with No. 70 base asphalt. The results are shown in Table 1: Table 1 Road performance test

[0056] The test results show that the road base performance of the asphalt mixture for resisting road icing of the present invention is significantly better than that of ordinary asphalt mixture, and meets the requirements of the test procedures for asphalt and asphalt mixture of highway engineering.

[0057] 2. Snow melting performance test: The asphalt mixture prepared in Example 1-3 was marked as Sample 1-3 by wheel rolling method, and the snow melting performance was compared with that of the No. 70 base asphalt pavement at 0°C and standard atmospheric pressure. A layer of 3 cm thick and 0.239 g / cm3 was covered on the surface of each rutting plate of the same specification and weight, and the total weight was 30 cm×30 cm×3 cm×0.239 g / cm 3 , that is, the total weight of snow is 645.3g. The relationship between the amount of snowmelt and time is shown in Table 2.

[0058] Table 2 Snow melting performance test results

[0059] The test results show that the snow-melting performance of the asphalt mixture for resisting road icing of the present invention is significantly better than that of ordinary asphalt mixture, and the snow-melting effect is more significant.

[0060] 3. Ice breaking performance test: The asphalt mixture prepared in Example 1-3 was marked as Sample 1-3 by the wheel rolling method, and the ice breaking performance comparison test was carried out with No. 70 base asphalt at -5°C and standard atmospheric pressure, and the ice thickness was 1.5 cm. The equipment is improved from the original rutting test machine and can simulate the road driving conditions in ice and snow weather. It is also evaluated by the degree of cracking and fragmentation on the pavement surface.

[0061] ; Where: R C —Ice-breaking rate, %; C A —Total area of ​​cracks and splinters, cm 2 ; L—total length of a single crack, cm; λ—Influence coefficient of converting single crack length into area, taken as 0.3; A—total test area, cm 2 .

[0062] The ice breaking rate of each sample is shown in Table 3.

[0063] Table 3 Icebreaking performance test results

[0064] The test results show that the ice-breaking performance of the asphalt mixture for resisting road icing of the present invention is significantly better than that of ordinary asphalt mixture, and the ice-breaking effect is more significant with the increase of the amount of high elastic modifier. The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention, according to the technical solution and its inventive concept of the present invention, shall be covered within the protection scope of the present invention.

Claims

1. An asphalt mixture for resisting road icing, characterized in that: It is prepared from the following components in parts by weight: 50-70 parts of No. 70 base asphalt; 25-40 parts of aggregate; 10-30 parts of styrene-butadiene latex; 10-20 parts of polydimethylsiloxane; 5-10 parts of nano silicon dioxide; 2 to 8 parts of anti-icing agent; 1 to 3 parts of self-repairing agent.

2. The asphalt mixture for resisting road icing according to claim 1, characterized in that: The aggregate is any one of manganese slag powder, limestone powder, and fly ash, or a mixture of several of them, with a particle size of ≤2.35mm; the anti-icing agent is any one of sodium chloride, magnesium chloride, and calcium oxide; the self-healing agent is any one of calcium sulfoaluminate, polyvinyl alcohol fiber, nano-scale carbon black, and polyacrylonitrile-based carbon fiber, or a mixture of several of them.

3. A method for preparing the asphalt mixture for resisting road icing according to claim 1, characterized in that: The steps include: S1: Preparation of hydrophobic SBR rubber phase change material; Styrene-butadiene latex, polydimethylsiloxane, nano-silica and a self-repairing agent accounting for 30% of the total amount of the self-repairing agent are weighed in a ratio and added to a mixing tank in sequence, mixed evenly, and then added to a banbury mixer for refining at a temperature of 120-200° C. for 0.5-3 h to obtain a rubber compound; the mixed rubber compound is hot-pressed into a sheet using a calender, and subsequently the sheet is stacked into a desired thickness using a calender as needed, and then secondary calendering is performed to obtain a rubber sheet, which is then crushed and set aside; S2: Preparation of asphalt mixture for resistant road icing; Karamay No. 70 base asphalt, aggregate, and anti-icing agent (70% of the total amount of the self-repairing agent) are sequentially added to a mixing tank and mixed evenly. At room temperature and pressure, the mixture is stirred evenly at a speed of 150 to 300 r / min. The mixture is heated to 80 to 130°C and stirred at a speed of 200 to 300 r / min for 0.5 h to obtain the asphalt mixture that resists road icing. The hot pressing forming pressure of the calender in step 1 is 5 to 20 MPa, and the thickness of the sheet is 0.2 to 1.0 mm.

4. An apparatus for preparing the asphalt mixture for resisting road icing according to claim 3, characterized in that: The calender used in S1 comprises a base (1), wherein the inner cavity of the base (1) is provided with a first roller (2), a second roller (3) and a third roller (4), wherein the first roller (2) is located on one side of the second roller (3), and the third roller (4) is located below the second roller (3), and a rubber baffle (5) is provided between the first roller (2) and the second roller (3), wherein the position of the third roller (4) is adjusted by an adjusting mechanism (6), and the third roller (4) is rotated by a rotating mechanism (7), and the position of the rubber baffle (5) is adjusted by an installing mechanism (8), wherein the adjusting mechanism (6) comprises a first movable groove (601) and a second movable groove (602), wherein the first movable groove (601) and the second movable groove (602) are provided. The second movable groove (602) is respectively opened at both ends of the base (1); the inner wall of the first movable groove (601) is slidably connected to the first movable block (603); the inner wall of the second movable groove (602) is slidably connected to the second movable block (604); the two ends of the third roller (4) are rotatably connected to the first movable block (603) and the second movable block (604); a first motor (605) is installed at the top of the base (1); the output end of the first motor (605) is connected to a first threaded rod (606); the first threaded rod (606) passes through the first movable block (603); the inner wall of the second movable groove (602) is fixedly connected to a limiting rod (607) passing through the second movable block (604).

5. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 4, characterized in that: The rotating mechanism (7) includes a mounting frame (701), the mounting frame (701) is fixedly connected to the outer wall of the base (1), a support frame (702) is fixedly connected to one side of the mounting frame (701), a second motor (703) is installed on the outer wall of the mounting frame (701), an output end of the second motor (703) is connected to a first spur gear (704), the first spur gear (704) is fixedly connected to the first roller (2), one end of the second roller (3) is fixedly connected to a second spur gear (705), the second spur gear (705) is in contact with the first spur gear (704), and the second spur gear (705) is in contact with the first spur gear (704). One end of the second spur gear (705) is fixedly connected to the third bevel gear (708), the outer wall of the third bevel gear (708) is provided with a fourth bevel gear (709), the third bevel gear (708) is rotatably connected to the support frame (702), the bottom end of the fourth bevel gear (709) is fixedly connected to a square rod (710), one end of the third roller (4) is fixedly connected to the first bevel gear (706), the interior of the second movable block (604) is located on the outer wall of the first bevel gear (706) and is rotatably connected to the second bevel gear (707), and the square rod (710) passes through the second bevel gear (707).

6. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 5, characterized in that: The mounting mechanism (8) comprises a side plate (801), the side plate (801) being symmetrically connected to the top of the base (1), a support rod (802) being fixedly connected between the two side plates (801), an outer wall of the side plate (801) being located below the support rod (802) and being rotatably connected to a second threaded rod (803), both ends of the second threaded rod (803) being fixedly connected to a rotating block (804), a displacement plate (805) being slidably connected to the outer walls of the support rod (802) and the second threaded rod (803), a connecting groove (806) being provided on the outer wall of the displacement plate (805), a fixing groove (807) being provided on the inner wall of the connecting groove (806), a connecting block (808) being fixedly connected to the outer wall of the rubber baffle (5), and a connecting block (808) being slidably connected to the inner wall of the connecting block (808) extending to the connecting groove (806). The fixing block (809) is outside the block (808), a first spring (810) is connected between the fixing block (809) and the connecting block (808), the interior of the connecting block (808) is located on one side of the fixing block (809) and is slidably connected to a lower pressure seat (811), the interior of the lower pressure seat (811) is slidably connected to a cross bar (812) extending from the lower pressure seat (811), a second spring (813) is connected between the cross bar (812) and the lower pressure seat (811), the interior of the lower pressure seat (811) is located at the bottom end of the cross bar (812) and is rotatably connected to a third spur gear (814), the interior of the lower pressure seat (811) is located at the bottom end of the third spur gear (814) and is slidably connected to a push rod (815), and the push rod (815) extends from the lower pressure seat (811).

7. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 4, characterized in that: The inner wall of the first movable groove (601) fits with the outer wall of the first movable block (603), the inner wall of the second movable groove (602) fits with the outer wall of the second movable block (604), and the outer wall of the first movable block (603) is provided with a first threaded hole, which matches the first threaded rod (606).

8. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 5, characterized in that: The first spur gear (704) is meshed with the second spur gear (705), the third bevel gear (708) is meshed with the fourth bevel gear (709), the first bevel gear (706) is meshed with the second bevel gear (707), and a square groove (9) is provided on the outer wall of the second bevel gear (707), and the inner wall of the square groove (9) is in contact with the outer wall of the square rod (710).

9. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 6, characterized in that: A second threaded hole is provided on the outer wall of the displacement plate (805), and external threads are symmetrically provided on the outer wall of the second threaded rod (803), wherein the external threads match the second threaded hole.

10. The equipment used in the method for preparing an asphalt mixture that resists road icing according to claim 6, characterized in that: The inner wall of the connecting groove (806) is in contact with the outer wall of the connecting block (808), the inner wall of the fixing groove (807) is in contact with the outer wall of the fixing block (809), the outer wall of the lower pressure seat (811) is fixedly connected with a vertical block (10), the interior of the connecting block (808) is provided with a vertical groove (11) for the vertical block (10) to slide, the outer walls of the cross bar (812) and the push rod (815) are both provided with tooth grooves, and the tooth grooves are engaged with the third spur gear (814).

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