Urban asphalt pavement anti-skid and low-noise structure

Abstract

The application discloses a city asphalt pavement anti-skid and low-noise structure, which comprises a noise reduction and anti-skid surface layer arranged above a pavement base layer, and a sound absorption layer arranged on both sides of the pavement base layer and perpendicular to the noise reduction and anti-skid surface layer; the noise reduction and anti-skid surface layer is paved by using coarse aggregate, fine aggregate, mixed fiber and bonding material as raw materials; the mass ratio of the coarse aggregate, the fine aggregate, the mixed fiber and the bonding material is 35:51:8.5:5.5; the mixed fiber is sawtooth-shaped steel fiber with a diameter of 0.2 mm and a length of 1.8 mm and polyethylene fiber with a length of 1.6 mm, and the mass ratio of the sawtooth-shaped steel fiber and the polyethylene fiber is 1:4. The application increases the mixed fiber by optimizing the component allocation ratio of the surface layer, increases the porosity under the condition of ensuring the pavement strength, and improves the anti-skid and noise reduction effects.

Description

Technical Field

[0001] This invention relates to the field of urban asphalt pavement technology, and in particular to an anti-skid and low-noise structure for urban asphalt pavement. Background Technology

[0002] With the modernization of cities, asphalt pavement has been widely used in urban roads due to its advantages such as high smoothness, comfortable driving experience, and wear resistance. However, in order to ensure the driving safety of urban residents and a good living environment, how to improve the anti-skid and noise reduction performance of urban asphalt pavement has become an urgent problem to be solved in urban road construction. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0004] Another objective of this invention is to provide an anti-skid and low-noise structure for urban asphalt pavements. This structure addresses existing problems by optimizing the surface layer composition ratio, increasing mixed fibers, and increasing porosity while ensuring pavement strength, thereby improving anti-skid and noise reduction effects.

[0005] To achieve these objectives and other advantages according to the present invention, the technical solution of the present invention is as follows:

[0006] A skid-resistant and low-noise structure for urban asphalt pavement, comprising:

[0007] Noise-reducing and anti-skid surface layer, which is applied on the road base layer;

[0008] The sound-absorbing layer is disposed on both sides of the road base layer perpendicular to the noise-reducing and anti-skid surface layer;

[0009] The noise-reducing and anti-slip surface layer is constructed from coarse aggregate, fine aggregate, mixed fiber, and binder material, with a mass ratio of 35:51:8.5:5.5.

[0010] The mixed fibers consist of serrated steel fibers with a diameter of 0.2 mm and a length of 1.8 mm and polyethylene fibers with a length of 1.6 mm, with a mixing mass ratio of 1:4 between the serrated steel fibers and the polyethylene fibers.

[0011] Preferably, the adhesive material is composed of epoxy resin A, epoxy resin B and emulsified asphalt in a mass ratio of 8:12:80.

[0012] Preferably, the sound-absorbing layer consists of a sound-absorbing plate and a porous sound-absorbing layer, with a 10.5 mm cavity between the sound-absorbing plate and the porous sound-absorbing layer. The specific preparation process of the porous sound-absorbing layer includes: crushing coal gangue, ball milling it into fine coal gangue powder, sieving it to obtain coal gangue powder with a particle size of 120–240 μm, adding water, additives, and a gelling agent, stirring at 1600 r / min for 8 min to ensure thorough mixing, adding a foaming agent, stirring at 900 r / min for 5 min, adding 4 drops of foam stabilizer, stirring for 40 s, adding a coagulant, stirring for 40 s, quickly molding, allowing it to stand for 28 h, and drying and sintering the preform to obtain a porous sound-absorbing material. The porous sound-absorbing layer is prepared using this porous sound-absorbing material.

[0013] Preferably, the additive is borax, the gelling agent is silica sol with a mass fraction of 30%, the foaming agent is sodium dodecyl sulfate, the foam stabilizer is silicone polyether emulsion, and the coagulant is ammonium chloride solution.

[0014] Preferably, the water-to-solid ratio is 0.38, the mass percentage of gelling agent added is 36%, and the sintering temperature is 720°C.

[0015] Preferably, the coarse aggregate is basalt and the fine aggregate is basalt manufactured sand; wherein the basalt manufactured sand is obtained by dry dust collection and air classification process, and the fineness modulus is 3.2.

[0016] Preferably, the foaming agent is added at a mass percentage of 0.2%, the ammonium chloride solution has a mass fraction of 0.32%, and the addition amount is 2.5 mL.

[0017] Preferably, the sound-absorbing plate is a perforated enamel steel plate, which is made by drilling circular holes in the enamel steel plate, and the diameter of the circular holes is 0.2 to 0.8 mm.

[0018] Preferably, the sound-absorbing panel has a thickness of 11 mm, the porous sound-absorbing layer has a thickness of 12 mm, and the upper and lower ends of the sound-absorbing panel and the porous sound-absorbing layer are sealed by non-perforated concrete slabs as sealing plates.

[0019] Preferably, the thickness of the noise-reducing and anti-slip surface layer is 17 mm.

[0020] The present invention has at least the following beneficial effects:

[0021] 1. The present invention provides an anti-skid and low-noise structure for urban asphalt pavement, which consists of two parts: a noise-reducing and anti-skid surface layer on the pavement base layer and sound-absorbing layers at both ends of the surface layer. This dual sound absorption and noise reduction greatly reduces noise pollution caused by vehicles traveling on urban asphalt pavement.

[0022] 2. The anti-skid and low-noise structure for urban asphalt pavement of the present invention optimizes the composition and ratio of the noise reduction and anti-skid surface layer, and adds mixed fibers. While ensuring the mechanical strength of the pavement and sufficient anti-loosening ability, it increases the porosity and improves the anti-skid and noise reduction effects.

[0023] 3. The bonding material in the anti-skid and low-noise structure of urban asphalt pavement of the present invention is a mixture of epoxy resin A, epoxy resin B and emulsified asphalt, and the proportion of the materials is optimized to improve the bonding performance between the components of the noise reduction and anti-skid surface layer, so as to avoid the pavement peeling phenomenon, which would make the pavement very easy to break and thus reduce the service life of the pavement.

[0024] 4. In the anti-skid and low-noise structure of urban asphalt pavement of the present invention, coal gangue, a solid waste discharged during the coal mining and coal washing process, is recycled and rationally utilized to make a porous sound-absorbing material, which is then used to prepare a sound-absorbing layer. The sound-absorbing layer is made of porous sound-absorbing material, which contains interconnected micropores. When sound waves are incident on the surface of the material, they enter the interior of the micropores and cause the air inside the pores to vibrate. Due to friction, air viscosity resistance and the heat conduction inside the material, a considerable portion of the sound energy is converted into heat energy and absorbed.

[0025] 5. In the anti-skid and low-noise structure for urban asphalt pavement of this invention, the sound-absorbing layer adopts a structure of sound-absorbing plate + cavity + porous sound-absorbing layer. The sound-absorbing plate is made of perforated enamel-lined steel plate, which has the toughness and impact resistance of steel plate, as well as the corrosion resistance, wear resistance, easy cleaning, aesthetics, and non-radiation characteristics of inorganic enamel. When sound waves pass through the perforated enamel-lined steel plate with through holes, the sound energy is converted into heat energy due to the friction and viscous resistance of air molecules in the cavity, thereby reducing the sound wave intensity. The backing is a porous sound-absorbing layer made of coal gangue, which has a high apparent air void ratio and sound absorption coefficient. Combined with the sound-absorbing plate, it can effectively reduce the noise of urban asphalt pavement. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the anti-skid and low-noise structure for urban asphalt pavement according to the present invention;

[0027] Figure 2 This is a schematic diagram of the perforated enamel steel plate in the anti-skid and low-noise structure for urban asphalt pavement of the present invention.

[0028] Attached figures: 1: Noise-reducing and anti-slip surface layer, 2: Sound-absorbing board, 3: Porous sound-absorbing layer, 4: Cavity, 5: Non-perforated concrete board. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0030] It should be noted that, unless otherwise specified, the testing methods in the following implementation schemes are conventional methods, and the materials mentioned are all commercially available unless otherwise specified.

[0031] <Example 1>

[0032] like Figure 1 and Figure 2 A skid-resistant and low-noise structure for urban asphalt pavement, comprising:

[0033] Noise-reducing and anti-skid surface layer 1 is disposed on the road base layer;

[0034] A sound-absorbing layer is provided on both sides of the road base layer, perpendicular to the noise-reducing and anti-skid surface layer 1;

[0035] Among them, the noise reduction and anti-slip surface layer 1 is laid out from coarse aggregate, fine aggregate, mixed fiber and bonding material as raw materials: the mass ratio of coarse aggregate, fine aggregate, mixed fiber and bonding material is 35:51:8.5:5.5;

[0036] The technical specifications for coarse aggregate are as follows: crushing value (%): ≤25, Los Angeles abrasion loss (%): ≤28, apparent relative density (g / cm³). 3 Fiber content: ≥2.6, Water absorption (%): ≤2.0, Soundness (%): ≤12, Content of needle-like and flaky particles: ≤15, Soft stone content (%): ≤3.0, Content of particles smaller than 0.075mm by water washing method (%): ≤1.0, Adhesion to asphalt: ≥5, Polishing value: ≥42, Apparent density (determined by basket method (T0304-2005)): 3.03 g / cm³ 2 The fine aggregate is basalt manufactured sand obtained through a dry dust collection and air classification process; the performance indicators are: gradation zone I, fineness modulus of 3.2, apparent density (determined by volumetric flask method (T0328-2005)): 2.630 kg / cm³. 3 Bulk density 1.470 kg / cm³ 3 It has a porosity of 44%, is free of mud, contains 4.2% stone powder, 1.0% mud lump, and a crushing index of 13%. The mixed fibers are serrated steel fibers with a diameter of 0.2 mm and a length of 1.8 mm and polyethylene fibers with a length of 1.6 mm, with a mixing mass ratio of 1:4 for the serrated steel fibers and polyethylene fibers. The bonding material consists of epoxy resin A, epoxy resin B and emulsified asphalt in a mass ratio of 8:12:80. The emulsified asphalt used is traditional emulsified asphalt.

[0037] The specific manufacturing process of the noise-reducing and anti-slip surface layer 1 includes:

[0038] Mix the components according to the addition ratio, stir for 3 hours, pour it onto the road base, spread it, and compact it with a double steel wheel vibratory roller at a speed of 5 km / h. After pouring, cover the pouring area and sprinkle water for curing. During the curing period, control the ambient temperature of the manufactured sand concrete to 35℃ to form a stable noise-reducing and anti-skid surface layer.

[0039] The specific manufacturing process of the sound-absorbing layer includes:

[0040] Step 1, Preparation of sound-absorbing plate 2: A perforated enamel steel plate is made by punching circular holes in the enamel steel plate. The diameter of the circular holes is 0.2-0.8 mm, and the thickness of the sound-absorbing plate 2 is 11 mm.

[0041] Step 2, Preparation of porous sound-absorbing layer 3: Coal gangue (chemical composition shown in Table 1 below) was crushed and ball-milled (material-to-ball ratio 1:2) for 15 minutes to obtain fine coal gangue powder. The powder was sieved to obtain coal gangue powder with a particle size of 120–240 μm. Water (water-to-solid ratio = 0.38), borax, and 36% silica sol were added. The mixture was stirred at 1600 r / min for 8 minutes to ensure thorough mixing. Then, 0.2% sodium dodecyl sulfate was added for foaming, and the mixture was stirred at 900 r / min for 5 minutes. Add 4 drops of 0.28% silicone polyether emulsion and stir for 40 seconds. Then add 2.5 mL of 0.32% ammonium chloride solution and stir for 40 seconds. Quickly pour the mixture into a mold and let it stand for 28 hours. Dry and sinter the preform (sintering temperature: 720℃) to obtain a porous sound-absorbing material. Use the porous sound-absorbing material to prepare a porous sound-absorbing layer with a thickness of 12 mm. All additives are analytical grade reagents produced by Shanghai Maclean Biochemical Technology Co., Ltd. The main mineral components of coal gangue are quartz, albite, and a small amount of kaolinite.

[0042] Step 3: Seal the upper and lower ends of the sound-absorbing board obtained in Step 1 and the porous sound-absorbing layer obtained in Step 2 with a non-perforated concrete slab 5 as a sealing plate, so that a cavity 4 of 10.5mm is formed between the sound-absorbing board 2 and the porous sound-absorbing layer 3; wherein the thickness of the concrete slab 5 is 15mm.

[0043] Table 1 Chemical composition of coal gangue

[0044] compound <![CDATA[SiO2]]> <![CDATA[Al2O3]]> CaO <![CDATA[Na2O]]> <![CDATA[K2O]]> <![CDATA[Fe2O3]]> BaO MgO LOI Quality percentage (%) 63.87 19.41 1.53 3.08 0.29 1.36 2.01 0.16 8.29

[0045] <Comparative Example 1>

[0046] An anti-skid and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the mixed fiber is lignin fiber.

[0047] <Comparative Example 2>

[0048] A skid-resistant and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the mixed fiber is a serrated steel fiber with a diameter of 0.2 mm and a length of 1.8 mm.

[0049] <Comparative Example 3>

[0050] An anti-skid and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the mixed fiber is a polyethylene fiber with a length of 1.6 mm.

[0051] <Comparative Example 4>

[0052] A new type of anti-skid and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the mass ratio of coarse aggregate, fine aggregate, mixed fiber and binder in the noise reduction and anti-skid surface layer is 35:55:4.5:5.5.

[0053] <Comparative Example 5>

[0054] A new type of anti-skid and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the mass ratio of coarse aggregate, fine aggregate, mixed fiber and binder in the noise reduction and anti-skid surface layer is 35:48:11.5:5.5.

[0055] <Comparative Example 6>

[0056] A low-noise, skid-resistant structure for urban asphalt pavement, which differs from Example 1 in that the sound-absorbing layer is composed of sound-absorbing panels.

[0057] <Comparative Example 7>

[0058] A skid-resistant and low-noise structure for urban asphalt pavement, which differs from Example 1 in that the sound-absorbing layer is composed of a porous sound-absorbing layer.

[0059] <Comparative Example 8>

[0060] A low-noise, skid-resistant structure for urban asphalt pavement, which differs from Embodiment 1 in that the sound-absorbing layer is composed of a sound-absorbing plate and a porous sound-absorbing layer, but no cavity is provided between the two.

[0061] The performance comparison of the anti-skid and low-noise structure of urban asphalt pavement in Example 1 with that of the comparative examples 1 to 5 is shown in Table 2 below.

[0062] Table 2. Performance comparison of the noise-reducing and anti-skid surface layer in the anti-skid and noise-reducing structure of urban asphalt pavement in Example 1 and Comparative Examples 1-5.

[0063]

[0064]

[0065] In the table, the porosity is given by the formula The calculation is as follows: P is the porosity of the specimen, V is the natural packing volume of the noise-reducing and anti-slip surface layer components, and V0 is the particle volume of the noise-reducing and anti-slip surface layer components. The flexural strength performance tests were conducted according to GB / T50080-2016 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The noise reduction coefficient was measured according to the requirements of the specification "Measurement of Sound Absorption in Acoustic Reverberation Chambers" (GB / T20247-2006).

[0066] As shown in Table 2 above, although the structural performance of the noise-reducing and anti-skid surface layer in Comparative Example 5 is comparable to that in the Example 1, the amount of mixed fibers added in Comparative Example 5 is significantly greater than that in Example 1. This will inevitably increase construction costs and material investment costs when preparing a road surface noise-reducing and anti-skid surface layer. In Comparative Examples 1-3, when a single type of fiber is used, its noise-reducing and flexural strength is significantly weakened. Not only does it fail to effectively reduce noise and skid, but the surface layer also has low flexural strength and is prone to breakage.

[0067] The performance comparison of the anti-skid and low-noise structures of urban asphalt pavement in Example 1 and Comparative Examples 6-8 is shown in Table 3 below.

[0068] Table 3. Performance comparison of the anti-skid and low-noise structures for urban asphalt pavements in Examples 1 and Comparative Examples 6-8

[0069] Performance parameters Noise reduction (dB) Noise reduction effect Example 1 10.3 The noise reduction effect is significant across all frequency bands. Comparative Example 6 5.9 It is effective against noise in the low-frequency range of 200-800Hz. Comparative Example 7 6.8 It is highly effective against noise in the high-frequency range of 630-1600Hz. Comparative Example 8 7.2 It has a noise reduction effect on noise in all frequency bands, but is lower than that of Example 1.

[0070] The noise reduction amount and noise reduction effect were measured in accordance with the requirements of the standard "Acoustic Reverberation Chamber Sound Absorption Measurement" (GB / T20247-2006).

[0071] As shown in Table 3 above, by setting up a sound-absorbing layer in conjunction with a noise-reducing and anti-skid surface layer, the noise reduction of urban asphalt pavement is greatly improved. It has a significant noise reduction effect on both low-frequency and high-frequency noise levels. The sound-absorbing layer structure is set as a sound-absorbing panel + cavity + porous sound-absorbing layer. The sound-absorbing panel is made of perforated enamel-lined steel plate, which possesses the toughness and impact resistance of steel plate, as well as the corrosion resistance, wear resistance, easy cleaning, aesthetic appeal, and non-radioactive properties of inorganic enamel. When sound waves pass through the perforated enamel-lined steel plate with through holes, the sound energy is converted into heat energy due to the friction and viscous resistance of air molecules in the cavity, thereby reducing the sound wave intensity. The backing is a porous sound-absorbing layer made of coal gangue, which has a high apparent air void ratio and sound absorption coefficient. Combined with the sound-absorbing panel, it can effectively reduce the noise of urban asphalt pavement.

[0072] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A skid-resistant and low-noise structure for urban asphalt pavement, characterized in that, include: The noise-reducing and anti-skid surface layer is laid on the road base layer and has a thickness of 17 mm. The noise-reducing and anti-skid surface layer is constructed from coarse aggregate, fine aggregate, mixed fiber, and binder as raw materials. The mass ratio of coarse aggregate, fine aggregate, mixed fiber, and binder is 35:51:8.5:5.

5. The mixed fiber consists of serrated steel fiber with a diameter of 0.2 mm and a length of 1.8 mm and polyethylene fiber with a length of 1.6 mm. The mass ratio of serrated steel fiber to polyethylene fiber is 1:

4. A sound-absorbing layer is disposed on both sides of the road base layer perpendicular to the noise-reducing and anti-skid surface layer. The sound-absorbing layer consists of a sound-absorbing plate and a porous sound-absorbing layer, with a cavity of 10.5 mm in width between the sound-absorbing plate and the porous sound-absorbing layer. The sound-absorbing plate is a perforated enamel-lined steel plate, which is made by drilling circular holes in the enamel-lined steel plate. The diameter of the circular holes is 0.2-0.8 mm and the thickness is 11 mm. The porous sound-absorbing layer is 12 mm thick. The upper and lower ends of the sound-absorbing plate and the porous sound-absorbing layer are sealed with non-perforated concrete slabs as sealing plates. The specific preparation process of the porous sound-absorbing layer includes: crushing coal gangue, ball milling it into fine coal gangue powder, sieving it to obtain coal gangue powder with a particle size of 120-240 µm, adding water, additives and gelling agents, stirring at a stirring speed of 1600 r / min for 8 min to make it fully mixed, adding foaming agent, stirring at a stirring speed of 900 r / min for 5 min, adding 4 drops of foam stabilizer, stirring for 40 s, adding coagulant, stirring for 40 s, quickly casting into molds, letting it stand for 28 h, drying and sintering the preform to obtain porous sound-absorbing material, and using porous sound-absorbing material to prepare a porous sound-absorbing layer; The additives are borax, the gelling agent is silica sol with a mass fraction of 30%, the foaming agent is sodium dodecyl sulfate, the foam stabilizer is silicone polyether emulsion, and the coagulant is ammonium chloride solution; the water-to-solid ratio is 0.38, the mass percentage of gelling agent added is 36%, and the sintering temperature is 720℃.

2. The anti-skid and low-noise structure for urban asphalt pavement as described in claim 1, characterized in that, The coarse aggregate is basalt, and the fine aggregate is basalt manufactured sand; the basalt manufactured sand is obtained by dry dust collection and air classification process, and the fineness modulus is 3.

2.

3. The anti-skid and low-noise structure for urban asphalt pavement as described in claim 1, characterized in that, The foaming agent was added at a mass percentage of 0.2%, the ammonium chloride solution at a mass fraction of 0.32%, and the amount added was 2.5 mL.

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