Rock asphalt composite modifier and its preparation method and use

Abstract

The invention discloses a rock asphalt compound modifier and a preparation method and use of the rock asphalt compound modifier. The rock asphalt compound modifier is composed of rock asphalt and polymer, wherein, the amount of the rock asphalt is 10 percent to 90 percent and the amount of the polymer is 10 percent to 90 percent in weight percentage. The preparation method is that the rock asphalt and the polymer are mixed together by a twin screw extruder in proportion, and then are granulated by a cold bracing and granulating equipment. The use of the rock asphalt compound modifier is that the rock asphalt compound modifier is put into an asphalt mixture mixing plant to be mixed with hot mineral aggregation for 5 to 20 seconds, and then basic asphalt is sprayed in to be mixed with the hot mineral aggregation for 20 to 60 seconds, at last the compound modified asphalt mixture is prepared. The rock asphalt compound modifier is in granular shape and has the advantages of accurate adding measurement, fine dispersion, uniform mixing and convenient construction. The compound modified asphalt mixture is suitable for paving the roads in high grade with further improved performance.

Description

technical field [0001] The invention relates to a rock asphalt composite modifier, a preparation method thereof, and an application of the rock asphalt composite modifier. Background technique [0002] Rock asphalt is a natural asphalt in solid form formed by the evaporation and solidification of oil that emerges from the crust under the extrusion of the crustal movement and exists in mountains and rock fissures. [0003] Rock asphalt is mainly composed of asphaltenes with a molecular weight of up to 10,000. Its chemical composition is carbon (C) 81.7%, hydrogen (H) 7.5%, oxygen (O) 2.3%, nitrogen (N) 1.95%, sulfur ( S) 4.4%, aluminum (Al) 1.1%, silicon (Si) 0.18% and other metals 0.87%. The chemical composition of rock asphalt in different places will change to a certain extent. [0004] Due to the high degree of polymerization of rock asphalt, the molecular weight is large and the softening point is high. It is mixed with base asphalt and used to pave asphalt pavement a...

AI Technical Summary

Problems solved by technology

[0010] Although rock asphalt has the above good properties, it also has certain defects and deficiencies when it is applied to road surfaces: 1) rock asphalt is lumpy or powdery, and the shape is irregular. If it is added directly, it is inconvenient to measure and mix, and it is not suitable for mixing evenly

2) The improvement of high temperature rutting resistance of rock asphalt is not significant enough. It is shown that the softening point of modified asphalt is not too high (the softening point of 10wt% rock asphalt modified is less than 60°C), and the dynamic stability of modified asphalt mixture not very high