Method for producing damping porous denoise tunnel asphalt covering material

Abstract

The invention relates to a preparation method of a tunnel asphalt surface layer material. A preparation method for damping porous noise-reducing tunnel asphalt pavement material is characterized in that it comprises the following steps: 1) preparation of high-viscosity and high-elasticity modified asphalt: base asphalt according to the mass ratio of each component: modifier SBS : Activated rubber powder: Viscosifying compatibilizer: Antioxidant: Stabilizer=100: 6.0~18.3: 20.2~45.7: 1.2~3.7: 0.2~1.4: 0.4~1.9, select; obtain high viscosity and high elasticity modification Asphalt; 2) Add flame retardant to high-viscosity and high-elasticity modified asphalt, heat and melt high-viscosity and high-elasticity modified asphalt to add flame retardant, stir for 3-9 minutes, and stand at 150-170°C for 15-30 minutes to obtain Flame-retardant high-viscosity high-elasticity modified asphalt; 3) according to the mass ratio, mineral material: flame-retardant high-viscosity high-elasticity modified asphalt: fiber stabilizer = 100: 3.6~5.2: 0.1~0.4, choose; noise tunnel asphalt surface material. The invention has the functions of noise reduction, flame retardancy and anti-skid.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a preparation method of a tunnel asphalt surface material. technical background [0002] The noise of tunnels is a technical issue of general concern. At present, the research on noise reduction pavement mostly focuses on the use of porous asphalt mixture, such as OGFC asphalt mixture, to absorb noise and eliminate the tire pumping effect. However, the sound absorption effect of porous materials is limited, reducing the The noise effect is generally only 2-4dB, which cannot fundamentally solve the problem of tunnel noise. The damping technology is mainly to add some materials that increase elasticity or have a space network structure to the asphalt to improve the damping characteristics of the material and eliminate the vibration and noise of the tires and even the vehicle body during driving. [0003] At present, large-scale road tunnels have the char...

AI Technical Summary

Problems solved by technology

[0003] At present, large-scale road tunnels have the characteristics of closed space, poor ventilation, and high noise. For fire safety considerations, large-scale road tunnels are very cautious in the use of asphalt materials

Some organic flame retardants, such as brominated flame retardants, are used in longer tunnels, and the pavement type is mostly AC series asphalt concrete, but this kind of flame-retardant asphalt concrete pavement cannot control the combustion of liquid combustibles such as gasoline at all, and is harmful to tunnel vehicles. The fire has no control effect. Studies have shown that under the high temperature state of complete combustion of gasoline, the limiting oxygen index of flame-retardant asphalt will be greatly reduced, and compared with gasoline and other combustibles, the partial combustion of asphalt pavement is negligible at all, so it must be effectively controlled Amount of combustible liquids such as gasoline participating in the combustion in the tunnel