Preparation method of high-performance asphalt mixture

Abstract

The invention discloses a preparation method of a high-performance asphalt mixture. The preparation method comprises the following steps: S1, setting the heating temperature of a stirring bin to be 180 DEG C; s2, putting a screened coarse and a fine aggregate in and stirring for 25-30 seconds, wherein the stirring rotating speed in the stirring process is 35 + / -0.5 r / min, and the vibration frequency is 40 + / -0.5 Hz; s3, adding asphalt, stirring for 25-30 seconds, wherein the stirring rotating speed in the stirring process is 35 + / -0.5 r / min, and the vibration frequency is 40 + / -0.5 Hz; s4, adding mineral powder, stirring for 25-30 seconds, wherein the stirring rotating speed in the stirring process is 35 + / -0.5 r / min, and the vibration frequency is 40 + / -0.5 Hz; and S5, discharging and preserving heat for later use. According to the preparation method disclosed by the invention, the asphalt can be fully utilized in the asphalt mixture, the loss of the asphalt mixture is reduced, and meanwhile, the pavement performance of the asphalt mixture can be improved.

Description

technical field [0001] The invention belongs to the technical field of road construction, and in particular relates to a preparation method of high-performance asphalt mixture. Background technique [0002] The mixers used in asphalt pavement projects in my country are mainly batch asphalt mixers. The batch asphalt mixer can feed and mix in batches to realize periodic cycle production. The disadvantages are low efficiency and high fuel consumption. At the same time, the asphalt mixture produced by the batch asphalt mixer has poor uniformity. Due to the viscous nature of asphalt itself, it is difficult for the fine aggregate and powder in the mixture to be completely evenly distributed, let alone achieve microscopic uniformity among materials. At the same time, when the circular speed of the stirring blade of the static forced mixer is too high, the material will be segregated under the action of centrifugal force, and the improvement of stirring intensity is limited, so tha...

AI Technical Summary

Problems solved by technology

The batch asphalt mixer can feed and mix in batches to realize periodic cycle production, but the disadvantages are low efficiency and high fuel consumption; at the same time, the asphalt mixture produced by the batch asphalt mixer has poor uniformity

Due to the viscous nature of asphalt itself, it is difficult for the fine aggregate and powder in the mixture to be completely evenly distributed, let alone achieve microscopic uniformity between materials.

At the same time, when the circular speed of the stirring blade of the static forced mixer is too high, the material will be segregated under the action of centrifugal force, and the improvement of stirring intensity is limited, so that the cementitious material and fine aggregate cannot be firmly coated. On the surface of coarse aggregate, especially for some raw materials with poor adhesion

[0003] In the traditional mixing asphalt mixture, no vibration is added, so that the asphalt cannot enter the micro-pores of the aggregate, causing early rutting deformation of the asphalt pavement, which affects driving safety

In winter, it is prone to cracking and damage, which will affect the service life of the entire pavement

During the service stage of the road surface, the traditional mixing asphalt mixture is prone to water damage, resulting in uneven road surface and unsafe driving

At the same time, with the increase of the service life of the asphalt pavement, the deformation or damage of the pavement will be more serious

Therefore, the asphalt mixture produced by static forced mixing technology cannot meet the needs of social development in terms of high temperature stability, low temperature crack resistance, water damage resistance and durability.

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