Asphalt mixture compound modifier

Abstract

The invention relates to an asphalt mixture compound modifier. The asphalt mixture compound modifier consists of a modified rubber matrix and a covering layer covered outside the modified rubber matrix, wherein the covering layer is made of thermoplastic high molecular materials; the modified rubber matrix comprises the following effective components in parts by weight: 10-70 parts of modified rubber powder, 5-20 parts of nanometer activated calcium carbonate and 10-40 parts of polyethylene-vinyl acetate; and the modified rubber powder is rubber powder which is modified by a surface compatilizer. As for the modifier, the covering layer is covered outside the modified rubber matrix to ensure that the cold-resistant and track-resistant effective components of asphalt can be improved, so that when the modifier, the asphalt and heating aggregate are stirred together, the covering layer of the modifier is adhered to the heating aggregate because of high temperature to separate the modified rubber matrix from the covering layer and fully stir and fuse the modified rubber matrix and the asphalt.

Description

technical field [0001] The invention relates to the technical field of modifiers, in particular to a composite modifier for asphalt mixture. Background technique [0002] In expressways, asphalt pavement is favored by many countries in the world for its good performance. In our country, asphalt pavement has also been widely used. At present, this kind of asphalt pavement accounts for the vast majority of the high-grade highways that have been built. Asphalt is a kind of viscoelastic material, which has the characteristics of easy softening at high temperature and embrittlement at low temperature. In recent years, with the influence of external factors such as the increase of traffic volume, heavy-duty vehicles, and the deterioration of weather conditions, the asphalt pavement is facing a severe test. Many newly built asphalt pavements have early diseases soon after they are opened to traffic, among which rutting has become one of the most serious early diseases that endang...

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Problems solved by technology

[0003] At present, the more economical method is to add one or several modifiers of cold resistance or anti-rutting performance to the asphalt, that is, first add aggregates such as stones in the mixing pot, and add them at a high temperature of 170-180°C Stir, then add this kind of modifier and asphalt and stir together with the heated aggregate. The modifier contains active ingredients that can improve the cold resistance and rutting resistance of asphalt. It needs to be fully mixed with asphalt to greatly enhance its performance. However, when the modifiers in the prior art are usually added to the mixing pot, most of their active ingredients adhere to the heated aggregate, and fail to fully mix and blend with the asphalt, resulting in the cold resistance and rutting resistance of the asphalt. weakened performance

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