A kind of asphalt mixture with physically modified red mud instead of mineral powder and its preparation method

Abstract

The invention relates to a bituminous mixture with physically modified red mud replacing mineral powder and a preparation method of the bituminous mixture, and belongs to the technical fields of roadengineering materials and preparation. The method comprises the following steps: firstly, mixing a modified material and water according to a certain ratio, so as to form a water solution; secondly, adding crushed and dried red mud into the water solution obtained in the first step according to a certain ratio, and stirring, so as to form mixed slurry; thirdly, ensuring that the mixed slurry obtained in the second step is subjected to suction filtration, drying and crushing processes, so as to obtain physically modified red mud powder used for preparing the bituminous mixture; fourthly, preparing the bituminous mixture through the physically modified red mud powder obtained in the third step replacing mineral powder. The bituminous mixture is prepared from the physically modified red mud replacing mineral powder, can effectively improve the high-and-low temperature performance and water damage resistance, and effectively guarantees the property.

Description

technical field [0001] The invention belongs to the technical field of road engineering materials and preparation, and relates to a preparation method of an asphalt mixture, in particular to an asphalt mixture using physically modified red mud instead of mineral powder and a preparation method thereof. Background technique [0002] Red mud (Red mud or Bauxite residue) is the insoluble solid industrial waste discharged after the alumina plant uses alkali to treat bauxite to extract alumina. Because it is rich in iron oxide, it appears red or brown, so it is called red mud . About 1.0-1.8 tons of red mud is produced for every ton of alumina produced. my country's aluminum industry has entered a stage of rapid development since the 1990s. While alumina production capacity has increased rapidly, red mud emissions have also increased. According to statistics, the cumulative stockpiles of red mud in my country have exceeded 350 million tons, of which the cumulative stockpiles in...

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Problems solved by technology

In 2016, the total discharge of red mud in my country was about 80 million tons, while the consumption was only 3.2 million tons, and the comprehensive utilization rate was less than 4%.

At the same time, due to the large amount of dust produced in the production process of limestone slag and its negative impact on air quality, some unqualified limestone slag production enterprises were shut down for rectification, resulting in an increase in the price of limestone slag year by year, which has brought great difficulties to road construction. Investment units and construction companies have brought serious cost pressures

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