Improved asphalt mixture and preparation method thereof

Abstract

The invention belongs to the technical field of road pavement, and particularly relates to an improved asphalt mixture and a preparation method thereof. The asphalt mixture is prepared from the following components in percentage by mass: 4.5 to 7.0 percent of asphalt binder, 0 to 1 percent of viscosity reducer, 0 to 12 percent of mineral powder and 80 to 90 percent of mineral aggregate, the invention relates to an asphalt mixture and a preparation method thereof. Adding the viscosity reducer into the preheated asphalt binder in advance for premixing, then heating the mineral aggregate to 160-180 DEG C, adding the mineral powder and the synthesized asphalt binder, and stirring to form the asphalt mixture. The invention provides the asphalt mixture with optimized gradation composition and preparation process of the fiber-free stabilizer, and the asphalt mixture has the characteristics of high practicability and low cost.

Description

technical field [0001] The invention belongs to the technical field of road paving, and in particular relates to an improved asphalt mixture and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the transportation market is expanding rapidly. The current surge in traffic volume and the proportion of heavy-duty and overloaded vehicles has put forward higher requirements for road surface performance and service quality. As a form of high-performance asphalt pavement, SMA is widely used at home and abroad due to its excellent anti-skid performance, high anti-rutting performance and durability. [0003] SMA is a dense gradation of asphalt-rich skeleton formed by intercalating coarse aggregates to form a skeleton, and then filling the gap with asphalt mastic formed by asphalt, mineral powder, fiber, and some fine aggregates. SMA grading has become the most common asphalt pavement structure due to its excellent high an...

AI Technical Summary

Problems solved by technology

[0004] However, in actual production, the addition of lignin fiber puts forward higher requirements on the mixing of asphalt mixture. First, the fiber needs to be added to the feeding equipment, and it needs to be pre-mixed for 5-8 seconds, which reduces the output by about 10%; The fiber must be dry, otherwise uneven dispersion will easily lead to agglomeration of the asphalt mixture. In addition, there are many types of fibers on the market, and the detection method is relatively unpopular, and the quality is difficult to control

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