Mix proportion design method of plant-mixed hot recycled asphalt mixture

Abstract

The invention discloses a mix proportion design method of a plant-mixed hot recycled asphalt mixture, relates to the technical field of road engineering, and belongs to the hot recycling technology ofasphalt materials. According to the method of the invention, the high-temperature and low-temperature comprehensive properties of a hot recycled asphalt mixture are fully considered; the asphalt mixture is composed of materials of a performance-decided thermal regeneration asphalt mixture, improper selection of an optimal asphalt-aggregate ratio caused by the inaccurate evaluation of the aging degree of recycled asphalt in RAP, inaccurate volume index test and the like is avoided; therefore, an RAP mixing amount and the performance of the recycled asphalt mixture are influenced, the optimal asphalt consumption OAC of the hot recycled asphalt mixture is determined through the performance, and the pavement performance of the hot recycled asphalt mixture is ensured.

Description

technical field [0001] The invention relates to the technical field of road engineering, and belongs to the heat regeneration technology of asphalt materials, in particular to a mixing ratio design method of factory-mixed heat-regenerated asphalt mixture. Background technique [0002] The information disclosed in this application and the background technology of the invention are only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes existing knowledge already known to those skilled in the art. technology. [0003] Asphalt pavement is the most important type of high-grade highway pavement in my country because of its comfortable driving and high safety. With the basic completion of my country's highway backbone network, the peak maintenance period is approaching, and we are faced with heavy pavement maintenance tasks. ...

AI Technical Summary

Problems solved by technology

At present, the asphalt index is good, and the volume parameter has become an important index to control the optimal asphalt ratio. This method is suitable for traditional new aggregates, but for old aggregates RAP, because it is a mixed material of various grades of aggregates, and it is coated with aged asphalt , it is difficult to accurately obtain the volume parameters, which in turn affects the accuracy of the mix ratio design

Ultimately, problems such as low RAP content and poor comprehensive mechanical properties are caused, which seriously restrict the large-scale popularization and application of hot recycled asphalt pavement.

Although the United States, Japan and other countries have conducted systematic research, RAP is extremely complex, and the industry has not yet proposed a mix design method that matches the characteristics of thermal recycled mixtures

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