Warm-mixed asphalt mixture and preparation method thereof

Abstract

The invention relates to a warm-mixed asphalt mixture and a preparation method thereof. The warm-mixed asphalt mixture is mainly applied to new construction and maintenance of high-grade roads and common roads, and is particularly suitable for cities, parks, tunnels and the like with high environmentally-friendly requirements. The warm-mixed asphalt mixture mainly comprises about 92.4-96.5 percent by weight of mineral, about 3.4-7.5 percent by weight of asphalt cement and 0.05-1.0 percent by weight of chemical modified adhesive cement. The preparation method comprises the following steps of: simultaneously pumping the chemical modified adhesive cement and the hot asphalt cement to the spraying port of a foam generator, fully mixing to generate a foam-containing hot asphalt mixture, spraying the foam-containing hot asphalt mixture into a mixing pan, and further mixing the foam-containing hot asphalt mixture and the hot mineral to form the warm-mixed asphalt mixture. The chemical modified adhesive cement can effectively reduce the mixing, spreading and rolling temperature of the asphalt mixture, and solves the problems of environmental pollution, high energy consumption, asphalt ageing regression and the like. By selecting high-concentration cationic chemical modified latex as a matrix stock of the chemical modified adhesive cement and simultaneously matching a proper proportionof cationic surfactant with lubricating effect and peeling resistance, the influence of the conventional warm-mixed asphalt additive on poor reducing performance and poor adhesive performance of the asphalt cement is solved, and the properties of the warm-mixed asphalt mixture such as water damage resistance, rutting resistance, fatigue resistance, low temperature resistance and the like are improved.

Description

technical field [0001] The invention relates to an asphalt mixture, in particular to a warm asphalt mixture and a preparation method thereof. Background technique [0002] Patent CN 101302348A discloses "A Warm Asphalt Mixture and Its Preparation Method": Put the hot ore with a weight ratio of 90wt% to 96wt% and a temperature of 140°C to 155°C into the mixing pot, and add an appropriate proportion at a temperature of 140°C Mix the hot asphalt binder at ~155°C for 20s to 30s, then add a certain amount of warm mix asphalt modifier Sasobit, and mix for 20s to 30s to prepare the warm asphalt mixture. Using this method to prepare warm-mix asphalt mixture, the production process is simple, and the high-temperature performance of the asphalt mixture is good, but its additives are not ideal for reducing the mixing temperature and rolling temperature of the asphalt mixture, and it is difficult to overcome its high production cost. Reduction of the extension properties of asphalt bin...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of environment-friendly warm mix asphalt mixture and preparation method thereof, this warm mix asphalt mixture has lower mixing, paving, compaction temperature than traditional hot mix asphalt mixture; Can effectively While retaining the original performance of hot mix asphalt mixture, it overcomes the problems of environmental pollution, high energy consumption, and aging of asphalt

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