Self-healing modified asphalt as well as preparation method and application thereof

Abstract

The invention discloses self-healing modified asphalt as well as a preparation method and application thereof. The self-healing modified asphalt is prepared from the following raw materials in percentage by weight: more than or equal to 30% of liquid rubber, with the balance being matrix asphalt, wherein the liquid rubber is obtained by adding tire rubber powder and a certain amount of a metal ioncatalyst into a reaction type screw extruder, pumping air into the reaction type screw extruder and then performing extruding. The self-healing modified asphalt is a mixture prepared by firstly adding liquid rubber into matrix asphalt and then conducting uniform blending. The self-healing modified asphalt provided by the invention not only has the advantages of outstanding ageing-resistant self-healing capability, environment-friendly processing process and the like, but also has both high-temperature and low-temperature performance and a wide range of applicable temperature; the preparationmethod is novel, efficient and convenient; and the self-healing modified asphalt is suitable for being widely applied to asphalt road construction and asphalt-based waterproof coiled material products, and has strong practicability and remarkable economic benefits.

Description

technical field [0001] The invention belongs to the technical field of functional modified asphalt, and in particular relates to a self-healing modified asphalt and its preparation method and application. Background technique [0002] Asphalt material is the main material for road and building waterproofing in my country. Due to its own defects such as easy aging and low temperature brittleness and the influence of external environmental factors, signs of cracks and damages usually appear after 3 to 4 years of service. Finally, under the joint action of external load, alternating cold and heat, and rain, common cracks and other diseases are formed, and the waterproof effect is greatly reduced. The initiation and propagation of cracks are irreversible and can only be resurfaced once they occur. SBS modification or rubber powder modification is often used to improve the cracking resistance. However, although these modification methods can prolong the life, they still cannot h...

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Problems solved by technology

[0009] Patents 200710132935.5 and 200910080211.X both proposed the method of desulfurizing rubber with a reactive twin-screw extruder. Under the action of the extruder screw, a high-temperature and high-pressure desulfurization environment can be realized to realize the desulfurization and regeneration of rubber. This technology is mainly used for liquid rubber Manufacturing, this method not only makes the equipment easy to wear due to the shear force during desulfurization, but also produces a large amount of waste gas that needs to be treated, and the rubber material has a strong odor

[0010] In order to solve the technological problems of low temperature (<160°C) easy addition, fast dispersion and high content of rubber powder in asphalt, and to improve the self-healing ability of modified asphalt, the invention provides a low-energy preparation of liquid rubber Method and use, in particular for improving the self-healing properties of asphalt

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