High-performance noise-reducing asphalt mixture and preparation method thereof

Abstract

The invention discloses a high-performance noise-reducing asphalt mixture and a preparation method thereof, the high-performance noise-reducing asphalt mixture comprises the following components in percentage by mass: 5.8%-6.0% of asphalt, 90%-91.2% of mineral aggregate, 3%-4% of mineral powder and 0.2%-0.3% of lignin fiber, and the total mass of the high-performance noise-reducing asphalt mixture is 100%. The preparation method comprises the steps of ingredient calculation, raw material preheating and material mixing. Compared with a traditional noise reduction formula, the asphalt mixture has lower void ratio, is not easy to block, has excellent noise reduction function and pavement performance, and solves the problem that traditional materials are difficult to maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixtures, and particularly relates to a high-performance noise-reducing asphalt mixture and a preparation method thereof. Background Art

[0002] With the increasing traffic density, the problem of road traffic noise has been deteriorating continuously. The generation of traffic noise not only makes people feel anxious, but also has a greater impact on social production, work, and people's life and health. One of the main sources of traffic noise is the friction between tires and the road surface. Traditional noise-reducing asphalt mixtures are large-void, fine-grained drainage asphalt concrete (such as PAC-13) and open-graded friction courses (such as OGFC-13), with a void ratio of about 20%. They mainly absorb road noise through the rich and connected voids inside the mixture. However, the relatively large void ratio also brings problems such as easy blockage, low strength, and difficult maintenance to porous asphalt pavements. After being in use for a period of time, the noise reduction effect of traditional noise-reducing asphalt mixtures decreases significantly, and a new type of asphalt mixture is needed to solve the above problems. Summary of the Invention

[0003] To solve the above problems, the present invention provides a high-performance noise-reducing asphalt mixture, which is characterized in that, by mass percentage, the asphalt mixture comprises the following components: 5.8% - 6.0% asphalt, 90% - 91.2% mineral aggregate, 3% - 4% mineral powder, 2‰ - 3‰ lignin fiber, and the total mass satisfies 100%.

[0004] Further, the asphalt is a high-viscosity and high-elasticity modified asphalt.

[0005] Further, the mineral aggregate is one or more of limestone and basalt; the mineral powder is limestone powder.

[0006] Further, the nominal maximum particle size of the mineral aggregate does not exceed 9.5 cm.

[0007] Further, the void ratio of the asphalt mixture is 7% - 10%.

[0008] The present invention also provides a preparation method for the above high-performance noise-reducing asphalt mixture, and the preparation method comprises the following steps:

[0009] Ingredient calculation: Weigh each component of the mixture according to the given mass percentage;

[0010] Raw material preheating: Heat the asphalt to 150°C - 170°C, the mineral aggregate to 160°C - 180°C, and the mineral powder to 165°C - 175°C;

[0011] Mixing: Add lignin fiber to the mineral aggregate and mix at a temperature of 160°C to 180°C for 18 s to 20 s; then add asphalt to the mineral aggregate mixture and mix at a temperature of 165°C to 175°C for 70 s to 90 s; finally, add mineral powder to the asphalt mixture and mix at a temperature of 165°C to 175°C for 70 s to 90 s.

[0012] The beneficial effects of the present invention are as follows: The void ratio of the high-performance noise-reducing asphalt mixture proposed in this application is only 7-10%, which is lower than that of traditional noise-reducing asphalt mixtures, making it difficult for impurities such as dust and gravel to enter the interior of the mixture, and greatly extending the noise reduction life. It retains a certain number of open pores on the surface, while the interior mainly consists of closed pores. When noise is generated on the asphalt pavement, the open pores consume part of the energy of the noise. After the sound wave passes through the open pores and enters the closed pores, it will be repeatedly refracted and consumed in the closed pores, thereby achieving a better noise reduction effect. Description of the Drawings

[0013] Figure 1 From left to right are the samples of the high-performance noise-reducing asphalt mixture of the present invention with void ratios of 7%, 8%, 9%, and 10% respectively. Detailed Embodiments

[0014] The technical solutions of the present invention will be further described in detail below with reference to specific embodiments. The following embodiments are only illustrative of and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0015] Unless otherwise specified, the raw materials and reagents used in the following embodiments are commercially available products or can be prepared by known methods.

[0016] The preparation of the high-performance noise-reducing asphalt mixture described in the present invention is carried out in the following steps.

[0017] Ingredient calculation: Weigh the following components according to mass percentage: 5.8% - 6.0% asphalt, 90% - 91.2% mineral aggregate, 3% - 4% mineral powder, 2‰ - 3‰ lignin fiber, and the total mass meets 100%.

[0018] Among them, the asphalt used is high-viscosity and high-elasticity modified asphalt, and its properties are shown in Table 1:

[0019] Table 1 Technical Requirements for High-Viscosity Asphalt

[0020]

[0021] The mineral materials used are one or more of limestone and basalt, and the nominal maximum size of the mineral materials does not exceed 9.5 cm; the mineral powder is limestone powder. There are no special requirements for the properties of the above aggregates, and it is sufficient to meet the "Technical Specifications for Construction of Highway Asphalt Pavements" (JTGF40-2004). Three grades of materials commonly used in engineering, namely 0-3 mm, 3-5 mm, and 5-10 mm, can be used.

[0022] The parameter requirements for the lignin fiber used are shown in Table 2:

[0023] Table 2 Quality and Technical Requirements for Lignin Fiber

[0024]

[0025] Raw material preheating: Heat the asphalt to 150°C - 170°C, the mineral materials to 160°C - 180°C, and the mineral powder to 165°C - 175°C;

[0026] Mixing: Add lignin fiber to the mineral materials for mixing. The mixing temperature is 160°C

[0027] - 180°C, and the mixing duration is 18 s - 20 s; then add the asphalt to the mineral material mixture for mixing. The mixing temperature is 165°C - 175°C, and the mixing duration is 70 s - 90 s; finally, add the mineral powder to the asphalt mixture for mixing. The mixing temperature is 165°C - 175°C, and the mixing duration is 70 s - 90 s to obtain a high-performance noise-reducing asphalt mixture with a void ratio of 7% - 10%.

[0028] To further illustrate the performance of the obtained asphalt mixture, it is used as a paving material in the upper layer of 30 mm - 40 mm of heavy-duty high-grade roads, and two traditional noise-reducing asphalt mixtures, namely SMA-13 asphalt mastic stone mixture and PAC-13 porous asphalt mixture, are used as control groups for testing. The test results are shown in Table 3:

[0029] Table 3 Test Results

[0030]

[0031] It can be seen from the comparison that the high-performance noise-reducing asphalt mixture provided by this application has better noise reduction ability and stronger road performance compared with traditional noise-reducing asphalt mixtures. Its lower void ratio is not easily blocked, and the noise reduction effect is lasting, solving the problem of difficult maintenance of traditional materials.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A high-performance noise-reducing asphalt mixture, characterized in that, By mass percentage, the asphalt mixture comprises the following components: 5.8% - 6.0% asphalt, 90% - 91.2% mineral aggregate, 3% - 4% mineral powder, and 2‰ - 3‰ lignin fiber, and the total mass meets 100%.

2. The high-performance noise-reducing asphalt mixture according to claim 1, characterized in that, The asphalt is a high-viscosity and high-elasticity modified asphalt.

3. The high-performance noise-reducing asphalt mixture according to claim 1, characterized in that, The mineral aggregate is one or more of limestone and basalt; the mineral powder is limestone powder.

4. The high-performance noise-reducing asphalt mixture according to claim 1, characterized in that The nominal maximum particle size of the mineral aggregate does not exceed 9.5 cm.

5. A high-performance noise-reducing asphalt mixture according to claim 1, characterized in that, The void ratio of the asphalt mixture is 7% - 10%.

6. The preparation method of the asphalt mixture according to any one of claims 1-5, characterized in that, The preparation method comprises the following steps: Ingredient calculation: Weigh each component of the mixture according to the given mass percentage. Raw material preheating: Heat the asphalt to 150°C - 170°C, the mineral aggregate to 160°C - 180°C, and the mineral powder to 165°C - 175°C. Mixing: Add lignin fiber to the mineral aggregate and mix at a temperature of 160°C - 180°C for 18 s - 20 s; then add the asphalt to the mineral aggregate mixture and mix at a temperature of 165°C - 175°C for 70 s - 90 s; finally, add the mineral powder to the asphalt mixture and mix at a temperature of 165°C - 175°C for 70 s - 90 s.

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