Anti-freezing asphalt mixture and preparation method thereof

Abstract

The invention discloses an anti-freezing asphalt mixture and a preparation method thereof, and relates to the technical field of asphalt mixtures. The anti-freezing asphalt mixture comprises, by weight, 100 parts of mixed aggregate, 5.8-6.0 parts of modified asphalt and 0.2-0.4 part of lignin fiber; and the mixed aggregate comprises, by weight, 10% of mineral powder, 5% of an anti-freezing agent,11-15% of machine-made sands, 30-34% of gravels with the particle size of 5-10 mm, and the balance of gravels with the particle size of 10-13 mm. A preparation process of the anti-freezing agent comprises the following steps: preparing a sodium chloride-zeolite compound, preparing a calcium chloride-mesoporous molecular sieve compound, spraying a coating liquid onto an inorganic salt compound composed of the sodium chloride-zeolite compound and the calcium chloride-mesoporous molecular sieve compound, and drying and dehydrating to obtain the anti-freezing agent. The anti-freezing asphalt mixture disclosed by the invention has a long-term anti-freezing effect.

Description

technical field [0001] The invention relates to the technical field of pavement materials, in particular to an anti-icing asphalt mixture and a preparation method thereof. Background technique [0002] Asphalt mixture is a general term for the mixture made by mixing aggregate and asphalt binder; there are two types of asphalt mixture commonly used in engineering: one is asphalt concrete mixture, which is composed of coarse aggregate and fine aggregate in appropriate proportions. Mixed aggregates composed of aggregates and fillers conforming to the specified gradation, mixed with asphalt binder, and the mixture with a residual void ratio of less than 10% after compaction, is referred to as asphalt concrete, expressed in AC. The second category is asphalt macadam mixture, which is a mixture of coarse aggregate, fine aggregate and filler (or no filler) mixed with asphalt in an appropriate proportion, and the remaining void ratio after compaction is more than 10%, referred to as...

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Problems solved by technology

[0003] When the asphalt mixture is used for road paving, in addition to good anti-rutting performance and durable stability, it should also have good adaptability to severe weather; The skid resistance of the surface is obviously reduced, which seriously affects the smoothness of the road and driving safety. At present, there are two main methods for deicing the road. The road is icy, but these methods have the disadvantages of low efficiency, high cost, and pollution to the environment; the other is to add salt materials to the pavement material to reduce the freezing point of the pavement material, so as to inhibit the icing of the road surface, which can greatly reduce the later stage. de-icing costs, and thus have been increasingly used

[0004] Traditional anti-icing agents mainly include salts such as sodium chloride, magnesium chloride, calcium chloride, and sodium acetate. Such anti-icing agents can lower the freezing point of pavement materials after being dissolved in water, and have better snow-melting and deicing effects. However, when this type of salt anti-icing agent is directly added to the asphalt mixture as a pavement material, under the action of road vehicle load and dynamic water pressure, the salt will quickly flow out with the water, losing the anti-icing effect, resulting in Decreased anti-icing durability of road surfaces

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