Asphalt concrete with ice breaking and noise reduction and method of making

Abstract

This invention discloses an asphalt concrete that combines ice-breaking and noise reduction with its manufacturing method, comprising the following raw materials by weight: 100-120 parts aggregate, 5-8 parts thermally conductive asphalt, 2-8 parts mineral powder, and 3-5 parts noise-reducing filler. The aggregate, noise-reducing filler, and mineral powder are stirred for 20 seconds, then the thermally conductive asphalt is added, mixed, and shaped to obtain the asphalt concrete that combines ice-breaking and noise reduction. Modified silicon carbide is introduced into the thermally conductive asphalt, with carbon nanotubes as the carbon source, silicon powder and silicon dioxide as the silicon source, and cobalt acetate as the cobalt source. Modified silicon carbide is prepared by solid-state sintering, in which cobalt atoms enter the silicon carbide lattice to prepare cobalt-doped silicon carbide. While silicon carbide itself has excellent thermal conductivity, the introduction of cobalt gives the modified silicon carbide magnetism and improves its microwave absorption performance. Under microwave action, it can quickly melt snow and break ice, and also improves the thermal conductivity of the asphalt, further improving the ice-breaking performance.

Description

Technical Field

[0001] This invention belongs to the field of concrete technology, specifically relating to an asphalt concrete that combines ice breaking and noise reduction, and its manufacturing method. Background Technology

[0002] Road surface conditions are a crucial factor affecting road traffic. Most of northern my country and some mountainous areas in the south are snow-covered zones in winter, with some areas experiencing snow cover for 3-4 months. Snow can bring benefits, but it can also bring disasters. Heavy snowfall and snow accumulation in these areas affect the smooth and safe operation of transportation. In icy and snowy weather, road surface adhesion is greatly reduced, which is extremely detrimental to vehicle power and safety. Statistics show that approximately 15% of traffic accidents are related to snow-covered roads. Road transport efficiency is extremely low in icy and snowy weather, causing serious damage to transportation facilities and vehicles, even leading to road closures, inconveniencing passenger and freight transport, causing huge economic losses to nearby cities, and seriously threatening the lives of drivers and passengers.

[0003] Currently, snow melting technologies both domestically and internationally mainly fall into two categories: external snow melting technology and internal snow melting technology.

[0004] External snow melting technologies for road surfaces include de-icing agents, mechanical snow removal, and manual snow removal; internal snow melting technologies include chloride addition, anti-freezing pavement technology, and thermal snow melting technology. While manual and mechanical snow removal can remove the snow layer covering the road surface, microscopic observation reveals that uneven areas still accumulate ice and snow, forming an ice-and-snow layer. This results in low adhesion between vehicles and the road surface, poor vehicle control and braking performance, and compromised driving safety. De-icing agents, whose main component is chloride, work by lowering the melting point of ice and snow, typically suitable for areas with thin snow cover and higher ambient temperatures. However, chlorides can have a significant impact on the surrounding environment. Research on anti-freezing pavement technology is still in its early stages, and its actual anti-freezing effect is not yet significant. Summary of the Invention

[0005] In order to solve the technical problems mentioned in the background art, the purpose of this invention is to provide an asphalt concrete that integrates ice breaking and noise reduction and its manufacturing method.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An asphalt concrete that combines ice breaking and noise reduction comprises the following raw materials in parts by weight: 100-120 parts aggregate, 5-8 parts thermally conductive asphalt, 2-8 parts mineral powder, and 3-5 parts noise-reducing filler.

[0008] The ice-breaking and noise-reducing asphalt concrete in this episode is made through the following steps:

[0009] Aggregates, noise-reducing fillers, and mineral powder are stirred at 165-180℃ for 20 seconds, then thermally conductive asphalt is added, and the mixture is stirred for 90-150 seconds before molding to obtain asphalt concrete that combines ice breaking and noise reduction.

[0010] Furthermore, the aggregate is limestone, granite, basalt, or diabase with a particle size of 0.075-16mm.

[0011] Furthermore, the thermally conductive asphalt is prepared through the following steps:

[0012] Step S1: Mix carbon nanotubes, silicon powder and silica powder evenly, add cobalt acetate, grind evenly and transfer to tube furnace, heat to 1500℃, introduce argon gas, react for 2 hours, after the reaction is completed, cool to 700℃ for high-temperature carbon removal, then cool to room temperature, treat with 45% hydrofluoric acid for 6 hours, wash with deionized water until the washing solution is neutral, dry to obtain modified silicon carbide;

[0013] In step S1, carbon nanotubes are used as the carbon source, silicon powder and silicon dioxide are used as the silicon source, and cobalt acetate is used as the cobalt source. Modified silicon carbide is prepared by solid-state sintering. Cobalt atoms enter the silicon carbide lattice to prepare cobalt-doped silicon carbide. While silicon carbide itself has excellent thermal conductivity, the introduction of cobalt element gives the modified silicon carbide magnetism and improves the microwave absorption performance of silicon carbide.

[0014] Step S2: By weight, heat 80-100 parts of asphalt until it melts, and add 10-15 parts of modified silicon carbide, 1-2 parts of sulfur powder and 5 parts of sodium dodecylbenzene sulfonate in sequence at a speed of 200-300 r / min to obtain a mixture. Then, shear and stir the mixture at 150-180℃ for 5 minutes, and let it cool naturally to room temperature to obtain thermally conductive asphalt.

[0015] Furthermore, in step S1, the weight ratio of carbon nanotubes, silicon powder, and silica powder is controlled to be 1:0.3-0.5:0.5-0.8, and the amount of cobalt acetate is 10-12% of the total weight of carbon nanotubes, silicon powder, and silica powder.

[0016] Furthermore, the shear rate in step S2 is 3000-5000 r / min.

[0017] Furthermore, the noise-reducing filler is prepared by the following steps:

[0018] Step S11: Add vermiculite to a heated ceramic evaporating dish in a microwave oven and heat it for 30 seconds at 240W. Then remove it from the ceramic evaporating dish and let it cool to obtain expanded vermiculite.

[0019] Step S12: Disperse carbon nanotubes in molten polyethylene glycol and stir at a constant speed at 75°C for 2 hours. Then add expanded vermiculite and keep warm for 4 hours. Transfer the mixture to filter paper and remove the permeated polyethylene glycol from the surface of the expanded vermiculite at 70°C. Continuously replace the filter paper until there are no permeation traces to obtain the noise-reducing filler. Control the weight ratio of carbon nanotubes, polyethylene glycol and expanded vermiculite to be 0.75-0.95∶9.10-9.15∶17.25.

[0020] In step S11, vermiculite is first expanded by microwave. Since water molecules are polar molecules, when high-frequency electromagnetic waves penetrate the water molecules between the vermiculite layers, the water molecules vibrate at high frequency, and the molecules collide with each other to generate a large amount of frictional heat, the temperature rises and eventually vaporizes, causing the vermiculite to expand. Then, in step S12, carbon nanotubes are dispersed in molten polyethylene glycol and then blended with expanded vermiculite. The carbon nanotubes are tightly wrapped by polyethylene glycol and are relatively uniformly dispersed in the pore structure and surface of expanded vermiculite, forming a three-dimensional through-through enhanced heat transfer channel. While expanded vermiculite itself is an excellent noise reduction material, it also gives the noise reduction filler excellent thermal conductivity, which can work synergistically with thermally conductive asphalt to improve the snow melting and ice breaking performance of concrete.

[0021] A method for producing asphalt concrete that combines ice-breaking and noise reduction includes the following steps:

[0022] Aggregates, noise-reducing fillers, and mineral powder are stirred at 165-180℃ for 20 seconds, then thermally conductive asphalt is added, and the mixture is stirred for 90-150 seconds before molding to obtain asphalt concrete that combines ice breaking and noise reduction.

[0023] The beneficial effects of this invention are:

[0024] This invention produces an asphalt concrete that combines ice-breaking and noise reduction. The formula incorporates noise-reducing fillers and thermally conductive asphalt, with modified silicon carbide introduced into the thermally conductive asphalt. Carbon nanotubes serve as the carbon source, silicon powder and silicon dioxide as the silicon source, and cobalt acetate as the cobalt source. Modified silicon carbide is prepared via solid-state sintering, where cobalt atoms are incorporated into the silicon carbide lattice, resulting in cobalt-doped silicon carbide. While silicon carbide itself possesses excellent thermal conductivity, the introduction of cobalt imparts magnetism to the modified silicon carbide, enhancing its microwave absorption properties. Under microwave irradiation, it can rapidly melt snow and break ice. This invention not only removes ice but also increases the thermal conductivity of asphalt, further improving its ice-breaking performance. In addition, the invention incorporates a noise-reducing filler. During the preparation process, carbon nanotubes are dispersed in molten polyethylene glycol and then blended with expanded vermiculite. The carbon nanotubes are tightly wrapped by polyethylene glycol and are relatively uniformly dispersed in the pore structure and surface of the expanded vermiculite, forming a three-dimensional through-hole enhanced heat transfer channel. While expanded vermiculite itself is an excellent noise-reducing material, it also endows the noise-reducing filler with excellent thermal conductivity, which can synergistically improve the snow melting and ice-breaking performance of concrete with thermally conductive asphalt. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] An asphalt concrete that combines ice breaking and noise reduction comprises the following raw materials in parts by weight: 100 parts limestone, 5 parts thermally conductive asphalt, 2 parts mineral powder, and 3 parts noise-reducing filler.

[0028] The ice-breaking and noise-reducing asphalt concrete in this episode is made through the following steps:

[0029] Limestone, noise-reducing filler, and mineral powder are stirred at 165°C for 20 seconds. Then, thermally conductive asphalt is added, and the mixture is stirred for 90 seconds before molding to produce asphalt concrete that combines ice-breaking and noise reduction properties.

[0030] The thermally conductive asphalt is prepared through the following steps:

[0031] Step S1: Mix carbon nanotubes, silicon powder and silica powder evenly, add cobalt acetate, grind evenly and transfer to a tube furnace, heat to 1500℃, introduce argon gas, react for 2 hours, after the reaction is completed, cool to 700℃ for high-temperature carbon removal, then cool to room temperature, treat with 45% hydrofluoric acid for 6 hours, wash with deionized water until the washing solution is neutral, dry to obtain modified silicon carbide, control the weight ratio of carbon nanotubes, silicon powder and silica powder to be 1:0.3:0.5, and the amount of cobalt acetate is 10% of the weight of carbon nanotubes, silicon powder and silica powder;

[0032] Step S2: By weight, 80 parts of asphalt are heated to melt, and 10 parts of modified silicon carbide, 1 part of sulfur powder and 5 parts of sodium dodecylbenzenesulfonate are added sequentially at a speed of 200 r / min to prepare a mixture. Then, the mixture is sheared and stirred at 150°C for 5 min, and then naturally cooled to room temperature to obtain thermally conductive asphalt. The shear rate is 3000 r / min.

[0033] The noise-reducing filler is prepared by the following steps:

[0034] Step S11: Add vermiculite to a heated ceramic evaporating dish in a microwave oven and heat it for 30 seconds at 240W. Then remove it from the ceramic evaporating dish and let it cool to obtain expanded vermiculite.

[0035] Step S12: Disperse carbon nanotubes in molten polyethylene glycol and stir at a constant speed at 75°C for 2 hours. Then add expanded vermiculite and keep warm for 4 hours. Transfer the mixture to filter paper and remove the permeated polyethylene glycol from the surface of the expanded vermiculite at 70°C. Continuously replace the filter paper until there are no permeation traces to obtain the noise-reducing filler. Control the weight ratio of carbon nanotubes, polyethylene glycol and expanded vermiculite to be 0.75:9.10:17.25.

[0036] Example 2

[0037] An asphalt concrete that combines ice breaking and noise reduction comprises the following raw materials in parts by weight: 110 parts granite, 6 parts thermally conductive asphalt, 5 parts mineral powder, and 4 parts noise-reducing filler.

[0038] The ice-breaking and noise-reducing asphalt concrete in this episode is made through the following steps:

[0039] Granite, noise-reducing filler, and mineral powder were stirred at 170°C for 20 seconds. Then, thermally conductive asphalt was added, and the mixture was stirred for 120 seconds before molding to produce asphalt concrete that combines ice-breaking and noise-reducing properties.

[0040] The thermally conductive asphalt is prepared through the following steps:

[0041] Step S1: Mix carbon nanotubes, silicon powder and silica powder evenly, add cobalt acetate, grind evenly and transfer to a tube furnace, heat to 1500℃, introduce argon gas, react for 2 hours, after the reaction is completed, cool to 700℃ for high-temperature carbon removal, then cool to room temperature, treat with 45% hydrofluoric acid for 6 hours, wash with deionized water until the washing solution is neutral, dry to obtain modified silicon carbide, control the weight ratio of carbon nanotubes, silicon powder and silica powder to be 1:0.4:0.6, and the amount of cobalt acetate is 11% of the weight of carbon nanotubes, silicon powder and silica powder;

[0042] Step S2: By weight, 90 parts of asphalt are heated to melt, and 12 parts of modified silicon carbide, 1.5 parts of sulfur powder and 5 parts of sodium dodecylbenzenesulfonate are added sequentially at a speed of 250 r / min to prepare a mixture. Then, the mixture is sheared and stirred at 160°C for 5 min, and then naturally cooled to room temperature to obtain thermally conductive asphalt. The shear rate is 4000 r / min.

[0043] The noise-reducing filler is prepared by the following steps:

[0044] Step S11: Add vermiculite to a heated ceramic evaporating dish in a microwave oven and heat it for 30 seconds at 240W. Then remove it from the ceramic evaporating dish and let it cool to obtain expanded vermiculite.

[0045] Step S12: Disperse carbon nanotubes in molten polyethylene glycol and stir at a constant speed at 75°C for 2 hours. Then add expanded vermiculite and keep warm for 4 hours. Transfer the mixture to filter paper and remove the permeated polyethylene glycol from the surface of the expanded vermiculite at 70°C. Continuously replace the filter paper until there are no permeation traces to obtain the noise-reducing filler. Control the weight ratio of carbon nanotubes, polyethylene glycol and expanded vermiculite to be 0.85:9.12:17.25.

[0046] Example 3

[0047] An asphalt concrete that combines ice breaking and noise reduction comprises the following raw materials in parts by weight: 120 parts basalt, 8 parts thermally conductive asphalt, 8 parts mineral powder, and 5 parts noise-reducing filler.

[0048] The ice-breaking and noise-reducing asphalt concrete in this episode is made through the following steps:

[0049] Basalt, noise-reducing filler, and mineral powder are stirred at 180°C for 20 seconds, then thermally conductive asphalt is added, and the mixture is stirred for 150 seconds before molding to produce asphalt concrete that combines ice-breaking and noise reduction.

[0050] The thermally conductive asphalt is prepared through the following steps:

[0051] Step S1: Mix carbon nanotubes, silicon powder and silica powder evenly, add cobalt acetate, grind evenly and transfer to a tube furnace, heat to 1500℃, introduce argon gas, react for 2 hours, after the reaction is completed, cool to 700℃ for high-temperature carbon removal, then cool to room temperature, treat with 45% hydrofluoric acid for 6 hours, wash with deionized water until the washing solution is neutral, dry to obtain modified silicon carbide, control the weight ratio of carbon nanotubes, silicon powder and silica powder to be 1:0.5:0.8, and the amount of cobalt acetate is 12% of the weight of carbon nanotubes, silicon powder and silica powder;

[0052] Step S2: By weight, 100 parts of asphalt are heated to melt, and 15 parts of modified silicon carbide, 2 parts of sulfur powder and 5 parts of sodium dodecylbenzenesulfonate are added sequentially at a speed of 300 r / min to obtain a mixture. Then, the mixture is sheared and stirred at 180°C for 5 min, and then naturally cooled to room temperature to obtain thermally conductive asphalt. The shear rate is 5000 r / min.

[0053] The noise-reducing filler is prepared by the following steps:

[0054] Step S11: Add vermiculite to a heated ceramic evaporating dish in a microwave oven and heat it for 30 seconds at 240W. Then remove it from the ceramic evaporating dish and let it cool to obtain expanded vermiculite.

[0055] Step S12: Disperse carbon nanotubes in molten polyethylene glycol and stir at a constant speed at 75°C for 2 hours. Then add expanded vermiculite and keep warm for 4 hours. Transfer the mixture to filter paper and remove the permeated polyethylene glycol from the surface of the expanded vermiculite at 70°C. Continuously replace the filter paper until there are no permeation traces to obtain the noise-reducing filler. Control the weight ratio of carbon nanotubes, polyethylene glycol and expanded vermiculite to be 0.95:9.15:17.25.

[0056] Comparative Example 1

[0057] Compared with Example 1, this comparative example uses commercially available asphalt instead of thermally conductive asphalt.

[0058] Comparative Example 2

[0059] Compared with Example 1, this comparative example uses vermiculite instead of noise-reducing filler.

[0060] Comparative Example 3

[0061] This comparative example uses ice-breaking concrete produced by a certain company that is sold in the market.

[0062] The concrete samples prepared in Examples 1-3 and Comparative Examples 1-3 were heated in a microwave oven for 20s, 30s, 40s, 50s, and 60s, respectively. After heating, the surface temperature of the concrete samples was measured using an infrared thermal imager. The results are shown in Table 1 below.

[0063] Table 1

[0064]

[0065]

[0066] As can be seen from Table 1 above, the concrete prepared in Examples 1-3 of the present invention can heat up quickly and has excellent snow melting and ice breaking performance. Moreover, the added noise-reducing filler can work synergistically with the thermally conductive asphalt.

[0067] The noise reduction performance of the concrete prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the results are shown in Table 2 below:

[0068] Table 2

[0069] Sound absorption coefficient at a frequency of 0.5 kHz Sound absorption coefficient at 1 kHz Example 1 0.4592 0.9012 Example 2 0.4598 0.9015 Example 3 0.4598 0.9016 Comparative Example 1 0.4590 0.9008 Comparative Example 2 0.4165 0.8106 Comparative Example 3 0.1950 0.4572

[0070] As can be seen from Table 2 above, the concrete prepared in Examples 1-3 of the present invention has excellent sound absorption properties.

[0071] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An asphalt concrete that combines ice-breaking and noise reduction, characterized in that, The raw materials include the following parts by weight: 100-120 parts aggregate, 5-8 parts thermally conductive asphalt, 2-8 parts mineral powder, and 3-5 parts noise-reducing filler; The ice-breaking and noise-reducing asphalt concrete in this episode is made through the following steps: Aggregates, noise-reducing fillers and mineral powder are stirred at 165-180℃ for 20 seconds, then thermally conductive asphalt is added, and after mixing for 90-150 seconds, it is molded to obtain asphalt concrete that combines ice breaking and noise reduction. The thermally conductive asphalt is prepared through the following steps: Step S1: Mix carbon nanotubes, silicon powder and silica powder evenly, add cobalt acetate, grind evenly and transfer to tube furnace, heat to 1500℃, introduce argon gas, react for 2 hours, after the reaction is completed, cool to 700℃ for high-temperature carbon removal, then cool to room temperature, treat with 45% hydrofluoric acid for 6 hours, wash with deionized water until the washing solution is neutral, dry to obtain modified silicon carbide; Step S2: By weight, heat 80-100 parts of asphalt until it melts, and add 10-15 parts of modified silicon carbide, 1-2 parts of sulfur powder and 5 parts of sodium dodecylbenzene sulfonate in sequence at a speed of 200-300 r / min to obtain a mixture. Then, shear and stir the mixture at 150-180℃ for 5 minutes, and let it cool naturally to room temperature to obtain thermally conductive asphalt. The noise-reducing filler is prepared by the following steps: Step S11: Add vermiculite to a heated ceramic evaporating dish in a microwave oven and heat it for 30 seconds at 240W. Then remove it from the ceramic evaporating dish and let it cool to obtain expanded vermiculite. Step S12: Disperse carbon nanotubes in molten polyethylene glycol and stir at a constant speed at 75°C for 2 hours. Then add expanded vermiculite and keep warm for 4 hours. Transfer the mixture to filter paper and remove the permeated polyethylene glycol from the surface of the expanded vermiculite at 70°C. Continuously replace the filter paper until there are no permeation traces to obtain the noise-reducing filler. Control the weight ratio of carbon nanotubes, polyethylene glycol and expanded vermiculite to be 0.75-0.95∶9.10-9.15∶17.

25.

2. The asphalt concrete combining ice breaking and noise reduction according to claim 1, characterized in that, The aggregate is limestone, granite, basalt, or diabase with a particle size of 0.075-16mm.

3. The asphalt concrete combining ice breaking and noise reduction according to claim 1, characterized in that, In step S1, the weight ratio of carbon nanotubes, silicon powder and silica powder is controlled to be 1:0.3-0.5:0.5-0.8, and the amount of cobalt acetate is 10-12% of the total weight of carbon nanotubes, silicon powder and silica powder.

4. The asphalt concrete combining ice breaking and noise reduction according to claim 1, characterized in that, The shear rate in step S2 is 3000-5000 r / min.

5. The method for producing asphalt concrete that combines ice breaking and noise reduction according to claim 1, characterized in that, Includes the following steps: Aggregates, noise-reducing fillers, and mineral powder are stirred at 165-180℃ for 20 seconds, then thermally conductive asphalt is added, and the mixture is stirred for 90-150 seconds before molding to obtain asphalt concrete that combines ice breaking and noise reduction.

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