Method for recycling asphalt from asphalt mixture

Abstract

The invention discloses a method for recycling asphalt from an asphalt mixture. The method is characterized by comprising the following steps: 1 extracting an asphalt solution from the asphalt mixture; 2 centrifugally separating the extracted asphalt solution, and extracting an upper solution for later use; 3 putting the upper solution into a microwave heating device, wherein the temperature of the microwave heating device is set to be 90-100 DEG C, simultaneously injecting a protective gas to the bottom of a flask, when the temperature of the flask reaches the set temperature, increasing the ventilatory capacity to 1500+/-50ml/min, further distilling for 10 minutes; and when the drainage amount of the condensed part is reduced, heating the flask to 160+/-2 DEG C, increasing the ventilatory capacity to 2,000+/-50ml/min, and finishing asphalt recycling until no liquid drop appears on the condensed part. The method for recycling the asphalt from the asphalt mixture is accurate in temperature control and free of secondary ageing; and mineral powder and trichloro ethylene do not affect recycling of asphalt.

Description

technical field [0001] The invention belongs to the technical field of asphalt recovery, and in particular relates to a method for recovering asphalt from asphalt mixture. Background technique [0002] In my country's "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011, there are two methods for recovering asphalt: the Abson method and the rotary evaporator method. Among them, the Abson method is a widely used test method. According to domestic and foreign experimental research, the Abson method has the following problems: a. The traditional heating method has an impact on the aging of asphalt, the heating rate is not controlled accurately, and the temperature is easy. beyond the allowable range of the test. b. The carbon dioxide injected in the final stage of recovery cannot fully disturb the bitumen, and the heating is not uniform. c. It is not easy to directly judge whether trichlorethylene is distilled clean. d. In the process of as...

AI Technical Summary

Problems solved by technology

Among them, the Abson method is a widely used test method. According to domestic and foreign experimental research, the Abson method has the following problems: a. The traditional heating method has an impact on the aging of asphalt, the heating rate is not controlled accurately, and the temperature is easy. beyond the allowable range of the test

b. The carbon dioxide injected in the final stage of recovery cannot fully disturb the bitumen, and the heating is uneven

c. It is not easy to directly judge whether trichlorethylene is distilled clean

d. In the process of recycling asphalt, because the required amount of asphalt recovery cannot be achieved at one time, the method of adding asphalt liquid multiple times may cause secondary aging of asphalt

e. Centrifugal separation cannot quantitatively determine whether the ore powder in the recovered liquid has been removed, and the content of the ore powder directly affects the properties of the recovered asphalt

[0003] At present, there are also many methods that have been relatively improved: 1. The asphalt solution is left to stand and stratified, and the upper layer solution is t

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