Thermal regeneration steel slag asphalt mixture and preparation method thereof

Abstract

The invention relates to a thermal regeneration steel slag asphalt mixture and a preparation method thereof. The thermal regeneration steel slag asphalt mixture comprises the following raw materials in parts by weight: 6-24 parts of steel slag, 27-29 parts of old asphalt mixture, 3.9-4.5 parts of asphalt, 42-60 parts of basalt and 5.4-5.6 parts of mineral powder, wherein the optimal asphalt-aggregate ratio is 3.9-4.5%, the steel slag and the old asphalt mixture are both used as coarse aggregates, and the residual aggregates are basalt and limestone mineral powder. According to the present invention, the thermal regeneration steel slag asphalt mixture test piece has characteristics of good high temperature stability, good low temperature crack resistance and good water stability; by adding steel slag, the low temperature crack resistance of the mixture is enhanced while the blending rate of the regeneration asphalt pavement material is improved, wherein when the steel slag content is 23.94 parts, the old asphalt pavement material content is 27.69 parts, and the aggregate replacement rate achieves 51.63 parts; the problem of excessive mining of stones is solved, and the ecological environment is protected; and by adding the steel slag, the blending rate of the old asphalt pavement material is increased, the cost is reduced, and the problem that a large amount of steel slag and the old asphalt pavement material cannot be utilized is solved.

Description

technical field [0001] The invention relates to a hot recycled steel slag asphalt mixture and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] my country's highway construction began in 1988. As of the end of 2019, the total mileage of national highways has reached 5.0125 million kilometers, the total mileage of secondary and above roads is 672,000 kilometers, and the expressway is 149,600 kilometers, ranking first in the world. According to statistics, asphalt pavement accounts for about 90% of highway pavement in my country and 70% of road pavement in large cities. In our country, a large amount of waste asphalt pavement (reclaimed asphalt pavement abbreviated as RAP) is produced every year in the maintenance of large and medium-sized roads. If these waste asphalt pavement materials are used for the maintenance and renovation of original roads or new road construction, not only can save resources, Also red...

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Problems solved by technology

[0006] In view of the existing background technology, the present invention proposes a thermally recycled steel slag asphalt mixture and its preparation method. On the one hand, the blending rate of RAP is increased by adding steel slag; The problem of unutilized steel slag and RAP also avoids excessive mining of stones and protects the environment

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