Recovering method of asphalt in asphalt mixture

Abstract

The invention discloses a recovering method of asphalt in an asphalt mixture. The method comprises the steps that: asphalt in asphalt mixture is extracted by using a centrifugal separation method specified by highway engineering asphalt and asphalt mixture testing procedures, such that an asphalt solution is obtained; the obtained asphalt solution is placed in a beaker and is allowed to stand for 24h for precipitation, and an upper-layer asphalt solution is obtained; the obtained asphalt solution is subjected to asphalt recovery by using an Abson method specified by the highway engineering asphalt and asphalt mixture testing procedures; the obtained recovered asphalt is placed in an aluminum spoon with a relatively large diameter, and is evaporated for 4h under a temperature of 130 DEG C in a baking oven, such that final recovered asphalt is obtained. The obtained final recovered asphalt can be used in various performance tests. With the recovering method of asphalt in asphalt mixture, the influences such as mineral powder and trichloroethylene residual solutions during the extraction and recovery processes upon the performances of asphalt can be effectively eliminated, such that the performance test accuracy of the recovered asphalt can be ensured.

Description

technical field [0001] The invention is a test method for effectively recycling asphalt in asphalt mixture, which not only helps to accurately evaluate the asphalt ratio of asphalt mixture, but also helps to accurately test the performance of asphalt after recovery, and belongs to the technical field of highway asphalt pavement detection . Background technique [0002] Existing studies have shown that the most widely used mixture gradation analysis and asphalt recovery methods in China, centrifugal extraction method and Abson recovery method, the performance variability of extracted and recovered asphalt is relatively large, and the variation coefficient of its viscosity can reach 20 % to 45%, the analysis of its causes can be attributed to the following two aspects: [0003] During the centrifuge extraction process, the asphalt was not completely extracted from the aggregate due to improper test operation. This incomplete extraction will not only lead to an underestimation...

AI Technical Summary

Problems solved by technology

[0005] Due to the difficulty of asphalt recycling, if the recycling conditions are not well grasped, it is inevitable that the properties of the recycled asphalt will vary.

However, domestic research and data on asphalt extraction and recovery methods are relatively small, and various methods basically refer to the regulations of American ASTM and Japan Road Association Pavement Test Method

Due to different national conditions and test conditions, there is a lack of detailed research on the applicability and accuracy of these methods in China, which brings great obstacles to the testing of asphalt performance and the application and popularization of asphalt pavement regeneration.