Hard asphalt mixture and preparation method thereof

Abstract

The invention discloses a hard asphalt mixture, which is made of the following components in parts by weight: 4.2-4.8 parts of modified hard asphalt, 92-94 parts of aggregate, 1.0-1.2 parts of mineral powder, modified hard asphalt Asphalt is made of modifier and base asphalt in a weight ratio of 3:7, and the modifier is prepared by the following steps: 1 weight part of nanometer hydrotalcite powder is added to 5 weight parts of ethylene glycol to disperse, and the pH value is adjusted to 4.0 , to obtain a slurry; 2 parts by weight of benzoic acid were dissolved in 5 parts by weight of ethylene glycol, the slurry was added dropwise, stirred and reacted at 130°C for 2h, filtered with suction, the supernatant was washed with water until neutral, and dried to obtain Modified nano hydrotalcite powder: Mix modified nano hydrotalcite powder, phenolic resin and oxidized polyethylene wax in a weight ratio of 2:7:3, extrude through a twin-screw extruder, and granulate to obtain the product. The invention has the advantages of reducing the mixing temperature of the hard asphalt mixture, improving high and low temperature performance, and the like.

Description

technical field [0001] The invention relates to the technical field of modified asphalt. More specifically, the present invention relates to a hard asphalt mixture and a preparation method thereof. Background technique [0002] Hard asphalt mixture has excellent high temperature stability, temperature sensitivity, water stability and fatigue resistance, but its low temperature performance is not good. Improve the anti-rutting and anti-fatigue performance of asphalt pavement. Most of the existing hard asphalt mixtures are hot mix asphalt mixtures. During the production process, asphalt and stone materials need to be mixed at a high temperature of 160-180°C. High temperature mixing will not only consume a lot of energy, but also generate a lot of smoke and dust And harmful gases, not only seriously affect the health of the staff, but also cause thermal aging of the asphalt and reduce the performance of the asphalt mixture. Contents of the invention [0003] The object of ...

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Problems solved by technology

[0002] Hard asphalt mixture has excellent high temperature stability, temperature sensitivity, water stability and fatigue resistance, but its low temperature performance is not good. Improving Rutting and Fatigue Resistance of Asphalt Pavements

Most of the existing hard asphalt mixtures are hot mix asphalt mixtures. During the production process, asphalt and stone materials need to be mixed at a high temperature of 160-180°C. High temperature mixing will not only consume a lot of energy, but also generate a lot of smoke and dust and harmful gases, which not only seriously affect the health of workers, but also cause thermal aging of asphalt and reduce the performance of asphalt mixture

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