Low-temperature modified asphalt concrete and preparation method thereof

Abstract

The invention discloses low-temperature modified asphalt concrete and a preparation method thereof, and belongs to the technical field of asphalt concrete. According to the invention, the base asphalt and the SBS modifier are mixed in proportion, and the base asphalt, the aggregate and the SBS are mixed to prepare the SBS modified asphalt concrete. The basalt fiber is added, so that the high-temperature stability, the low-temperature crack resistance and the water stability of the modified asphalt can be obviously improved; the added antioxidants ethoxyquin and tert-butylhydroquinone can effectively improve the aging resistance of the road asphalt, and the stabilizers sodium dodecyl benzene sulfonate and polyvinyl alcohol can effectively improve the storage stability of the road asphalt. Due to the addition of the crosslinking agent bismaleimide, a cross-linked network structure is better formed between the modified SBS block copolymer and the base asphalt, and the flowing property of the base asphalt is improved. And the prepared low-temperature modified asphalt concrete has excellent performances such as good low-temperature fluidity and good heat storage stability, is short in production period, and is suitable for large-scale industrial production and application.

Description

Technical Field

[0001] The invention relates to low-temperature modified asphalt concrete and a preparation method thereof, belonging to the technical field of asphalt concrete. Background Art

[0002] The increasing busyness of road transportation has led to serious damage to asphalt pavement, such as rutting, cracks, and potholes. The reason is that asphalt itself is sensitive to temperature, and its state and performance change significantly with temperature changes. As the temperature rises, asphalt becomes softer and thinner, and its adhesion weakens; when the temperature drops, it becomes thicker, harder, and brittle, and loses its adhesion. This characteristic is not conducive to the use of asphalt. In summer or hot areas, asphalt pavement is prone to rutting under heavy loads; in winter or cold areas, cracks are prone to cracking, which greatly shortens the service life of the pavement. With economic progress and the increase in traffic volume, the requirements for asphalt pavements are increasing.

[0003] The existing method of modifying asphalt mainly adopts polymer modified road asphalt, among which SBS modified asphalt is widely used. SBS modified asphalt concrete is a mixture obtained by adding SBS modifier to the original asphalt. Compared with the traditional base asphalt, the high temperature viscosity is increased and the softening point is higher, so that the durability and high temperature stability of the road surface paved with SBS modified asphalt concrete are improved. For example, a Chinese patent with publication number CN104710134B discloses a storage-stable and aging-resistant composite SBS particle modified asphalt concrete and its preparation method, the composite SBS particles include SBS 15%-38%, deep activated rubber powder 56%-82%, and interfacial compatibilizer 3%-6%, wherein the deep activated rubber powder is composed of rubber powder, softening oil and activator. The high temperature and high shear of the twin-screw extruder are used to act on the waste rubber powder to obtain the deep activated rubber powder.

[0004] The SBS concrete of the prior art often suffers from decomposition, aging and segregation during the storage of the finished asphalt due to problems with the compatibility of the SBS modifier with the base asphalt and the thermodynamic stability. During the construction process, the performance of the finished modified asphalt has decayed and cannot reach the optimal state of the SBS modified asphalt concrete, affecting the subsequent use effect of the SBS modified asphalt concrete. In addition, during the stirring and mixing, cross-linking agent particles need to be added to the SBS and asphalt mixture at the same time. Since the SBS and asphalt mixture has a large viscosity, the cross-linking agent particles are difficult to be quickly mixed into the SBS and asphalt mixture, resulting in a long time for the cross-linking agent particles to be evenly mixed with the SBS and asphalt mixture, which in turn leads to a long overall construction time. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide a low-temperature modified asphalt concrete and a preparation method and equipment thereof, which can improve the compressive strength and adhesion while reducing the construction temperature and time of the modified asphalt concrete.

[0006] 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 a low-temperature modified asphalt concrete, which is prepared from the following components in parts by weight: 35-60 parts of No. 70 base asphalt; 30-50 parts of modified styrene-butadiene-styrene block copolymer; Aggregate 25-40 parts; 20-30 parts of basalt fiber; 2-4 parts of ethoxyquinoline; 2-5 parts of sodium dodecylbenzene sulfonate; 1-5 parts of tert-butylhydroquinone; 1-3 parts of polyvinyl alcohol; 0.05 to 1 part of bismaleimide.

[0007] Preferably, the No. 70 base asphalt is commercially available Karamay 70# (KLM70) asphalt.

[0008] Preferably, the melt index of the styrene-butadiene-styrene copolymer is greater than 2. When the melt index is less than 2, it is subjected to oil filling treatment to make its melt index greater than 2.

[0009] 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.

[0010] Preferably, the basalt fiber is a short-cut basalt fiber with a length of 9 to 15 mm.

[0011] The second technical purpose of the present invention is to provide a method for preparing low-temperature modified asphalt concrete, comprising the following steps: S1: Preparation of hydrophobic SBS modified asphalt: Heat the proportion of No. 70 base asphalt to 170-190°C, then add it to the stirring device and continue stirring. Then add the proportion of basalt fiber, ethoxyquinoline, sodium dodecylbenzene sulfonate, tert-butylhydroquinone, polyvinyl alcohol, and bismaleimide to the stirring barrel in sequence, stir evenly at a speed of 100-300r / min at room temperature and pressure, add the modified styrene-butadiene-styrene block copolymer into the stirring barrel and stir and mix, the mixture is SBS modified asphalt; S2: preparing low-temperature modified asphalt concrete: adding aggregate to the SBS modified asphalt prepared in the above step S1, mixing and stirring, and after stirring evenly, a finished SBS modified asphalt concrete product can be obtained.

[0012] Another object of the present invention is to provide an equipment for preparing the low-temperature modified asphalt concrete, comprising a support frame, a mixing bin fixedly connected to the top of the support frame, a feed port being arranged on the outer wall of the mixing bin, a heating jacket being sleeved on the outer wall of the mixing bin located below the feed port, a liquid inlet and a liquid outlet being respectively arranged on both sides of the heating jacket, a discharge port being arranged at the bottom end of the mixing bin, a discharge valve being installed on the outer wall of the discharge port, the mixing bin stirring the material by a stirring mechanism, and the mixing bin scraping the inner wall by a scraping mechanism.

[0013] As a further solution of the present invention: the stirring mechanism includes a mounting frame, the mounting frame is fixedly connected to the top of the stirring chamber, a motor is installed on the top of the mounting frame, the output end of the motor is connected to a stirring shaft, the outer wall of the stirring shaft is fixedly connected to a stirring rod, the outer wall of the stirring shaft is located at the top of the inner wall of the stirring chamber and is fixedly connected to a first spur gear, the top of the inner wall of the stirring chamber is located at the outer wall of the first spur gear and is rotatably connected to a second spur gear, the top of the inner wall of the stirring chamber is located at the outer wall of the second spur gear and a rotatable rotating seat is provided, and a rotating frame is installed at the bottom of the rotating seat.

[0014] As a further scheme of the present invention: the scraping mechanism includes a rotating groove, the rotating groove is opened at the top of the inner wall of the mixing chamber and is located on the outer wall of the second spur gear, the top of the mounting frame is located on one side of the motor and a hydraulic cylinder is installed, the output end of the hydraulic cylinder is connected with a movable plate, the bottom end of the movable plate is fixedly connected with a movable rod, the bottom end of the movable rod is fixedly connected with a disc, the top of the rotating seat is opened with an annular groove, the rotating frame is slidably connected with the rotating seat, the interior of the rotating seat is located at the top of the rotating frame and is rotatably connected with a third spur gear, the interior of the rotating seat is located at the top of the third spur gear and is slidably connected with a connecting rod, one end of the connecting rod extends to the inner cavity of the rotating seat and is fixedly connected with a block, the top of the connecting rod is fixedly connected with a connecting plate, a spring is connected between the connecting plate and the rotating seat, the top of the connecting rod is opened with an inclined groove, the interior of the rotating seat is located above the inclined groove and is slidably connected with an extrusion plate, and the outer wall of the stirring shaft is located below the first spur gear and is fixedly connected with a ratchet.

[0015] As a further solution of the present invention: the first spur gear is meshed with the second spur gear, the inner wall of the rotating seat is provided with a first tooth groove, and the first tooth groove is meshed with the second spur gear.

[0016] As a further solution of the present invention: the inner wall of the rotating groove fits with the top outer wall of the rotating seat, the cross-sectional shape of the annular groove is T-shaped, the bottom inner wall of the annular groove fits with the outer wall of the disc, and the top of the annular groove fits with the outer wall of the movable rod.

[0017] As a further solution of the present invention: the outer walls of the connecting rod and the rotating frame are both provided with a second tooth groove, the second tooth groove is meshed with the third spur gear, and one end of the clamping block is engaged with the ratchet.

[0018] Compared with the existing detection technology, the beneficial effects of the present invention are embodied in: 1. The low-temperature modified asphalt concrete of the present invention adopts base asphalt and SBS modifier mixed in a certain proportion. The SBS modified asphalt concrete is prepared by mixing base asphalt, aggregate and SBS, which can improve the high and low temperature performance, aging resistance and mechanical properties of the SBS modified asphalt system, so that the prepared SBS modified asphalt concrete has stable performance and short production cycle, and is suitable for large-scale industrial production and application.

[0019] 2. The present invention adds basalt fiber, which can significantly improve the high-temperature stability, low-temperature crack resistance and water stability of the modified asphalt; the antioxidants ethoxyquinoline and tert-butylhydroquinone can effectively improve the aging resistance of road asphalt; the stabilizers sodium dodecylbenzene sulfonate and polyvinyl alcohol can effectively improve the storage stability of road asphalt; the addition of the cross-linking agent bismaleimide enables the modified SBS block copolymer and the base asphalt to form a better cross-linked network structure, thereby improving the flow properties of the base asphalt; with the use of the modified SBS block copolymer and other additives, the road asphalt improver containing the modified SBS block copolymer of the present invention has excellent properties such as good low-temperature fluidity and good thermal storage stability.

[0020] 3. The present invention is also equipped with a stirring device. The stirring device is provided with a stirring mechanism and a scraping mechanism. The operation of the motor drives the stirring shaft to rotate. The rotation of the stirring shaft drives the stirring rod to rotate. At the same time, the rotating frame rotates. The stirring rod and the rotating frame rotate in opposite directions at the same time, so that the material inside the stirring bin is fully stirred. When discharging, the hydraulic cylinder is started to drive the movable plate to move. The rotating seat moves out of the rotating groove. At this time, the rotating frame is displaced. The rotating frame moves to fit the stirring bin. At this time, the rotation of the stirring shaft drives the rotating frame to rotate. The rotating frame rotates to scrape the inner wall of the stirring bin, thereby preventing the material from sticking to the inner wall of the stirring bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the stirring device of the present invention; Figure 2It is a schematic diagram of the internal structure of the stirring chamber of the stirring device of the present invention; Figure 3 It is a schematic diagram of the internal structure of the rotating seat of the stirring device of the present invention; Figure 4 It is a schematic structural diagram of the second spur gear of the stirring device of the present invention; Figure 5 It is a schematic structural diagram of the rotating tank of the stirring device of the present invention; Figure 6 It is a schematic diagram of the installation of the rotating frame of the stirring device of the present invention; Figure 7 It is a schematic structural diagram of the connecting rod of the stirring device of the present invention.

[0022] In the figure: 1. support frame; 2. stirring chamber; 3. feed port; 4. heating jacket; 5. liquid inlet; 6. liquid outlet; 7. stirring mechanism; 701. mounting frame; 702. motor; 703. stirring shaft; 704. stirring rod; 705. first spur gear; 706. second spur gear; 707. rotating seat; 708. rotating frame; 8. scraping mechanism; 801. rotating groove; 802. hydraulic cylinder; 803. movable plate; 804. movable rod; 805. disc; 806. annular groove; 807. third spur gear; 808. connecting rod; 809. block; 810. connecting plate; 811. spring; 812. inclined groove; 813. extrusion plate; 814. ratchet; 9. discharge port; 10. discharge valve. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] Example 1: A low-temperature modified asphalt concrete and a preparation method thereof See also Figures 1 to 7 In the embodiment of the present invention, the low temperature modified asphalt concrete is prepared from the following components in parts by weight: 35 parts of No. 70 base asphalt; 40 parts of modified styrene-butadiene-styrene block copolymer; Aggregate 25 parts; Basalt fiber 20 parts; 2 parts of ethoxyquinoline; 2 parts of sodium dodecylbenzene sulfonate; 3 parts of tert-butylhydroquinone; 1 part of polyvinyl alcohol; 0.05 parts of bismaleimide; The No. 70 base asphalt is the commercially available Karamay No. 70 (KLM70) asphalt; the melting index of the styrene-butadiene-styrene copolymer is greater than 2. When the melting index is less than 2, it is subjected to oil filling treatment to make its melting index greater than 2; the aggregate is any one of manganese slag powder, limestone powder, fly ash or a mixture of several thereof, with a particle size of ≤2.35mm; the basalt fiber is short chopped basalt fiber with a length of 9-15mm.

[0026] A method for preparing low-temperature modified asphalt concrete comprises the following steps: S1: Preparation of hydrophobic SBS modified asphalt: Heat the proportion of No. 70 base asphalt to 170-190°C, then add it to the stirring device and continue stirring. Then add the proportion of basalt fiber, ethoxyquinoline, sodium dodecylbenzene sulfonate, tert-butylhydroquinone, polyvinyl alcohol, and bismaleimide to the stirring barrel in sequence, and stir evenly at a speed of 100r / min at room temperature and pressure. Add the modified styrene-butadiene-styrene block copolymer into the stirring barrel and stir and mix. The mixture is SBS modified asphalt; S2: preparing low-temperature modified asphalt concrete: adding aggregate to the SBS modified asphalt prepared in the above step S1, mixing and stirring, and after stirring evenly, a finished SBS modified asphalt concrete product can be obtained.

[0027] See also Figures 1 to 7 In the embodiment of the present invention, the stirring device used in step S1 includes a support frame 1, a stirring chamber 2 is fixedly connected to the top of the support frame 1, a feeding port 3 is arranged on the outer wall of the stirring chamber 2, a heating jacket 4 is sleeved on the outer wall of the stirring chamber 2 below the feeding port 3, a liquid inlet 5 and a liquid outlet 6 are arranged on both sides of the heating jacket 4, a discharge port 9 is arranged at the bottom of the stirring chamber 2, a discharge valve 10 is installed on the outer wall of the discharge port 9, the stirring chamber 2 stirs the material through a stirring mechanism 7, the stirring chamber 2 scrapes the inner wall through a scraping mechanism 8, the stirring mechanism 7 includes a mounting frame 701, and a mounting frame 702 is provided. The mounting frame 701 is fixedly connected to the top of the stirring chamber 2, and a motor 702 is installed on the top of the mounting frame 701. The output end of the motor 702 is connected to the stirring shaft 703, and the outer wall of the stirring shaft 703 is fixedly connected to the stirring rod 704. The outer wall of the stirring shaft 703 is located at the top of the inner wall of the stirring chamber 2 and is fixedly connected to the first spur gear 705. The top of the inner wall of the stirring chamber 2 is located at the outer wall of the first spur gear 705 and is rotatably connected to the second spur gear 706. The top of the inner wall of the stirring chamber 2 is located at the outer wall of the second spur gear 706 and a rotatable rotating seat 707 is provided, and a rotating frame 708 is installed at the bottom of the rotating seat 707.

[0028] In this embodiment: the material enters the interior of the stirring bin 2 through the feed port 3, and the heating jacket 4 heats the material in the stirring bin 2. When stirring, the motor 702 is started, and the motor 702 drives the stirring shaft 703 to rotate, and the stirring shaft 703 drives the stirring rod 704 to rotate. At the same time, the stirring shaft 703 drives the first spur gear 705 to rotate, and the first spur gear 705 drives the second spur gear 706 to rotate. The second spur gear 706 drives the rotating seat 707 to rotate, and the rotating seat 707 drives the rotating frame 708 to rotate. The stirring rod 704 and the rotating frame 708 rotate in opposite directions at the same time to fully stir the material inside the stirring bin 2.

[0029] Please refer to Figures 5 to 7 The scraping mechanism 8 includes a rotating groove 801, which is opened at the top of the inner wall of the mixing chamber 2 and is located on the outer wall of the second spur gear 706. The top of the mounting frame 701 is located on one side of the motor 702 and is equipped with a hydraulic cylinder 802. The output end of the hydraulic cylinder 802 is connected to a movable plate 803, and the bottom end of the movable plate 803 is fixedly connected to a movable rod 804. The bottom end of the movable rod 804 is fixedly connected to a disc 805. The top of the rotating seat 707 is provided with an annular groove 806. The rotating frame 708 is slidably connected to the rotating seat 707. The interior of the rotating seat 707 is located at the top of the rotating frame 708 and is rotatably connected to the first There are three spur gears 807, and a connecting rod 808 is slidably connected to the top of the third spur gear 807 inside the rotating seat 707. One end of the connecting rod 808 extends to the inner cavity of the rotating seat 707 and is fixedly connected to a block 809. A connecting plate 810 is fixedly connected to the top of the connecting rod 808. A spring 811 is connected between the connecting plate 810 and the rotating seat 707. An inclined groove 812 is opened on the top of the connecting rod 808. An extrusion plate 813 is slidably connected to the interior of the rotating seat 707 above the inclined groove 812. The outer wall of the stirring shaft 703 is located below the first spur gear 705 and is fixedly connected to a ratchet 814.

[0030] In this embodiment: when discharging, the material in the mixing bin 2 is discharged through the discharge port 9, and the hydraulic cylinder 802 is started at this time. The operation of the hydraulic cylinder 802 drives the movable plate 803 to move, and the displacement of the movable plate 803 drives the movable rod 804 to move, and the displacement of the movable rod 804 drives the disc 805 to move, and the displacement of the disc 805 drives the rotating seat 707 to move downward, and the rotating seat 707 moves out of the rotating groove 801 and separates from the second spur gear 706, and the rotating seat 707 moves downward to drive the rotating frame 708 to move downward, and at this time, the connecting plate 810 is moved by the elastic force of the spring 811, and the displacement of the connecting plate 810 drives The connecting rod 808 is displaced, and the displacement of the connecting rod 808 drives the block 809 to be displaced and engaged with the ratchet 814. At the same time, the displacement of the connecting rod 808 drives the third spur gear 807 to rotate. The rotation of the third spur gear 807 drives the rotating frame 708 to be displaced. The rotating frame 708 moves to fit with the mixing chamber 2. At this time, the stirring shaft 703 rotates to drive the ratchet 814 to rotate. The rotation of the ratchet 814 drives the rotating seat 707 to rotate through the connecting rod 808. The rotation of the rotating seat 707 drives the rotating frame 708 to rotate. The rotating frame 708 rotates to scrape the inner wall of the mixing chamber 2, thereby preventing the material from adhering to the inner wall of the mixing chamber 2. When the scraping is completed, the hydraulic cylinder 802 operates to drive the rotating seat 707 to move upward to the rotating groove 801 for reset. At this time, the top of the extrusion plate 813 contacts the rotating groove 801, and the extrusion plate 813 is displaced. The displacement of the extrusion plate 813 pushes the connecting rod 808 to displace, driving the block 809 to separate from the ratchet 814. At the same time, the displacement of the connecting rod 808 drives the connecting plate 810 to displace, causing the spring 811 to be squeezed; the displacement of the connecting rod 808 drives the third spur gear 807 to rotate, and the rotation of the third spur gear 807 drives the rotating frame 708 to displace and reset.

[0031] Please refer to Figures 1 to 4 The first spur gear 705 is meshed with the second spur gear 706 , and the inner wall of the rotating seat 707 is provided with a first tooth groove, and the first tooth groove is meshed with the second spur gear 706 .

[0032] In this embodiment, the stirring shaft 703 rotates to drive the first spur gear 705 to rotate, the first spur gear 705 rotates to drive the second spur gear 706 to rotate, the second spur gear 706 rotates to drive the rotating seat 707 to rotate, and the rotating seat 707 rotates to drive the rotating frame 708 to rotate.

[0033] Please refer to Figures 5 to 7 The inner wall of the rotating groove 801 fits with the top outer wall of the rotating seat 707, the cross-sectional shape of the annular groove 806 is T-shaped, the bottom inner wall of the annular groove 806 fits with the outer wall of the disc 805, and the top of the annular groove 806 fits with the outer wall of the movable rod 804.

[0034] In this embodiment, when the rotating seat 707 rotates in the rotating groove 801 , the movable rod 804 and the disk 805 slide in the annular groove 806 .

[0035] Please refer to Figures 5 to 7 The outer walls of the connecting rod 808 and the rotating frame 708 are both provided with a second tooth groove, the second tooth groove is meshed with the third spur gear 807, and one end of the clamping block 809 is engaged with the ratchet 814.

[0036] In this embodiment: the displacement of the extrusion plate 813 pushes the connecting rod 808 to displace, driving the block 809 to separate from the ratchet 814, and at the same time the displacement of the connecting rod 808 drives the connecting plate 810 to displace, causing the spring 811 to be squeezed; the displacement of the connecting rod 808 drives the third spur gear 807 to rotate, and the rotation of the third spur gear 807 drives the rotating frame 708 to displace and reset.

[0037] Example 2: A low-temperature modified asphalt concrete and its preparation method In this embodiment, the low temperature modified asphalt concrete is prepared from the following components in parts by weight: 50 parts of No. 70 base asphalt; 30 parts of modified styrene-butadiene-styrene block copolymer; Aggregate 35 parts; Basalt fiber 25 parts; 3 parts of ethoxyquinoline; 3 parts of sodium dodecylbenzene sulfonate; 1 part of tert-butylhydroquinone; 2 parts of polyvinyl alcohol; 0.5 parts of bismaleimide.

[0038] The No. 70 base asphalt is the commercially available Karamay No. 70 (KLM70) asphalt; the melting index of the styrene-butadiene-styrene copolymer is greater than 2. When the melting index is less than 2, it is subjected to oil filling treatment to make its melting index greater than 2; the aggregate is any one of manganese slag powder, limestone powder, and fly ash or a mixture of several thereof, with a particle size of ≤2.35mm; the basalt fiber is short-cut basalt fiber with a length of 9-15mm; The preparation method and application equipment are the same as those in Example 1 and will not be described in detail here.

[0039] Example 3: A low-temperature modified asphalt concrete and its preparation method A low-temperature modified asphalt concrete is prepared from the following components in parts by weight: 60 parts of No. 70 base asphalt; 50 parts of modified styrene-butadiene-styrene block copolymer; Aggregate 25 parts; 30 parts of basalt fiber; 4 parts of ethoxyquinoline; 5 parts of sodium dodecylbenzene sulfonate; 5 parts of tert-butylhydroquinone; 3 parts of polyvinyl alcohol; 1 part of bismaleimide.

[0040] The No. 70 base asphalt is the commercially available Karamay No. 70 (KLM70) asphalt; the melting index of the styrene-butadiene-styrene copolymer is greater than 2. When the melting index is less than 2, it is subjected to oil filling treatment to make its melting index greater than 2; the aggregate is any one of manganese slag powder, limestone powder, and fly ash or a mixture of several thereof, with a particle size of ≤2.35mm; the basalt fiber is short-cut basalt fiber with a length of 9-15mm; The preparation method and application equipment are the same as those in Example 1 and will not be described in detail here.

[0041] Performance testing and characterization: 1. Road performance test: According to the method specified in the "Highway Engineering Asphalt and Asphalt Mixture Test Procedure", the asphalt mixtures prepared in Examples 1 to 3 were marked as samples 1 to 3 and tested for road performance with No. 70 base asphalt. The results are shown in Table 1: Table 1 Road performance test

[0042] 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.

[0043] What has been described above are only preferred specific implementations 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, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-temperature modified asphalt concrete, prepared from the following components in parts by weight: 35-60 parts of No. 70 base asphalt; 30-50 parts of modified styrene-butadiene-styrene block copolymer; Aggregate 25-40 parts; 20-30 parts of basalt fiber; 2-4 parts of ethoxyquinoline; 2-5 parts of sodium dodecylbenzene sulfonate; 1-5 parts of tert-butylhydroquinone; 1-3 parts of polyvinyl alcohol; 0.05 to 1 part of bismaleimide.

2. The low temperature modified asphalt concrete according to claim 1, characterized in that: The No. 70 base asphalt is the commercially available Karamay No. 70 asphalt; the melting index of the styrene-butadiene-styrene copolymer is greater than 2; the aggregate is any one of manganese slag powder, limestone powder, fly ash or a mixture of several thereof, with a particle size of ≤2.35mm; the basalt fiber is short chopped basalt fiber with a length of 9 to 15mm.

3. A method for preparing the low-temperature modified asphalt concrete according to claim 1, characterized in that: The steps include: S1: Preparation of hydrophobic SBS modified asphalt: Heat the proportion of No. 70 base asphalt to 170-190°C, then add it into a stirring device and continue stirring, then add the proportion of basalt fiber, ethoxyquinoline, sodium dodecylbenzene sulfonate, tert-butylhydroquinone, polyvinyl alcohol, and bismaleimide into a stirring barrel in sequence, stir evenly at a speed of 100-300r / min at room temperature and pressure, add the modified styrene-butadiene-styrene block copolymer into the stirring barrel and stir and mix, the mixture is SBS modified asphalt; S2: preparing low-temperature modified asphalt concrete: adding aggregate to the SBS modified asphalt prepared in the above step S1, mixing and stirring, and after stirring evenly, a finished SBS modified asphalt concrete product can be obtained.

4. A method for preparing the low temperature modified asphalt concrete as claimed in claim 3, characterized in that: The stirring device used in step S1 comprises a support frame (1), the top of the support frame (1) is fixedly connected to a stirring chamber (2), the outer wall of the stirring chamber (2) is provided with a feed port (3), the outer wall of the stirring chamber (2) is located below the feed port (3) and is sleeved with a heating jacket (4), the two sides of the heating jacket (4) are respectively provided with a liquid inlet (5) and a liquid outlet (6), the bottom end of the stirring chamber (2) is provided with a discharge port (9), and the outer wall of the discharge port (9) is installed with a discharge valve (10), characterized in that the stirring chamber (2) stirs the material through a stirring mechanism (7), and the stirring chamber (2) scrapes the inner wall through a scraping mechanism (8).

5. A method for preparing the low temperature modified asphalt concrete as claimed in claim 4, characterized in that: The stirring mechanism (7) comprises a mounting frame (701), the mounting frame (701) being fixedly connected to the top end of the stirring chamber (2), a motor (702) being mounted on the top end of the mounting frame (701), a stirring shaft (703) being connected to the output end of the motor (702), a stirring rod (704) being fixedly connected to the outer wall of the stirring shaft (703), a first spur gear (705) being fixedly connected to the top end of the inner wall of the stirring chamber (2), a second spur gear (706) being rotatably connected to the outer wall of the first spur gear (705) being located at the top end of the inner wall of the stirring chamber (2), a rotatable rotating seat (707) being arranged on the outer wall of the second spur gear (706), and a rotating frame (708) being mounted on the bottom of the rotating seat (707).

6. A method for preparing the low temperature modified asphalt concrete as claimed in claim 5, characterized in that: The scraping mechanism (8) comprises a rotating groove (801), the rotating groove (801) is opened at the top of the inner wall of the stirring chamber (2) and is located on the outer wall of the second spur gear (706), the top of the mounting frame (701) is located on one side of the motor (702) and is equipped with a hydraulic cylinder (802), the output end of the hydraulic cylinder (802) is connected to a movable plate (803), the bottom end of the movable plate (803) is fixedly connected to a movable rod (804), the bottom end of the movable rod (804) is fixedly connected to a disc (805), the top end of the rotating seat (707) is opened with an annular groove (806), the rotating frame (708) is slidably connected to the rotating seat (707), and the interior of the rotating seat (707) is located at the top of the rotating frame (708) and is rotatably connected to the rotating seat (708). A third spur gear (807) is provided, the interior of the rotating seat (707) is located at the top of the third spur gear (807) and is slidably connected to a connecting rod (808), one end of the connecting rod (808) extends to the inner cavity of the rotating seat (707) and is fixedly connected to a clamping block (809), the top of the connecting rod (808) is fixedly connected to a connecting plate (810), a spring (811) is connected between the connecting plate (810) and the rotating seat (707), an inclined groove (812) is provided at the top of the connecting rod (808), an extrusion plate (813) is slidably connected to the interior of the rotating seat (707) and is located above the inclined groove (812), and the outer wall of the stirring shaft (703) is located below the first spur gear (705) and is fixedly connected to a ratchet (814).

7. A method for preparing the low temperature modified asphalt concrete as claimed in claim 5, characterized in that: The first spur gear (705) meshes with the second spur gear (706); the inner wall of the rotating seat (707) is provided with a first tooth groove; the first tooth groove meshes with the second spur gear (706).

8. A method for preparing the low temperature modified asphalt concrete as claimed in claim 6, characterized in that: The inner wall of the rotating groove (801) fits with the top outer wall of the rotating seat (707), the cross-section of the annular groove (806) is T-shaped, the bottom inner wall of the annular groove (806) fits with the outer wall of the disc (805), and the top of the annular groove (806) fits with the outer wall of the movable rod (804).

9. A method for preparing the low temperature modified asphalt concrete as claimed in claim 6, characterized in that: The outer walls of the connecting rod (808) and the rotating frame (708) are both provided with a second tooth groove, the second tooth groove is meshed with the third spur gear (807), and one end of the clamping block (809) is clamped with the ratchet (814).

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