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

An asphalt mixture and mix ratio design technology, which is applied in the mix ratio design of factory-mixed hot recycled asphalt mixture and the field of thermal regeneration of asphalt materials, can solve the problem of poor comprehensive mechanical properties, restrict the large-scale popularization and application of thermally recycled asphalt pavement, There are no other issues raised to achieve the effect of ensuring road performance

Active Publication Date: 2020-08-18
SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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  • Description
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  • Application Information

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

Method used

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

Examples

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Embodiment 1

[0045] This example is a design method for the mixing ratio of factory-mixed hot recycled asphalt mixture for a certain expressway located in the Sichuan Basin. The details are as follows:

[0046] (1) According to the location of the project, the area is a high-temperature area, and the type of hot recycled asphalt mixture is determined to be AC-13C, which is used for the surface layer of the expressway. The new asphalt is selected as SBS modified asphalt according to the local climate and other conditions, and the performance is graded Meet PG76-22.

[0047] (2) Test the performance of new asphalt, RAP, new aggregate and slag powder to determine the type and label of the above-mentioned substances:

[0048] ① The performance classification of new asphalt meets PG76-22, and Zhonghai SBS modified asphalt PG76-22 that meets the technical requirements is selected. The test indicators are shown in Table 1, and the penetration at 25°C refers to the "Test Regulations for Asphalt an...

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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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/00198C04B2111/0075C04B18/20C04B18/12C04B14/14
Inventor 张晓华张蓉张凌波毛成王海朋周水文罗丝雨
Owner SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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