A road performance evaluation method of factory-mixed hot recycled asphalt mixture

Abstract

The present invention proposes a road performance evaluation method of factory-mixed hot recycled asphalt mixture, the steps of which are: designing the mixing ratio of factory-mixed hot recycled asphalt mixture; conducting Hamburg rutting test, and collecting the rut depth when the load is applied 20,000 times RD; carry out DCT test, calculate cracking energy FE; draw the performance classification diagram of recycled asphalt mixture, and evaluate the performance of recycled asphalt mixture. The evaluation standard is: RD≤8mm; for light traffic grade road surface, FE≥420J / m 2 ; For medium traffic grade road surface, FE≥500J / m 2 ;For heavy traffic grade road surface, FE≥730J / m 2 , the smaller the RD and the larger the FE, the better the road performance of the recycled asphalt mixture; the larger the RD, the smaller the FE, the worse the road performance of the recycled asphalt mixture. The invention can effectively distinguish the performance of the recycled asphalt mixture with different RAP content and different regenerant types, is a method capable of accurately evaluating the comprehensive road performance of the recycled asphalt mixture, and can provide guidance for the design of the recycled asphalt mixture.

Description

technical field [0001] The invention belongs to the field of road performance evaluation of recycled asphalt mixture, in particular to a road performance evaluation method of factory-mixed hot recycled asphalt mixture constrained by dual indexes. Background technique [0002] As of the end of 2018, the total mileage of highways in my country reached 143,000 kilometers, and the mileage of second-class and above highways was 647,800 kilometers. Based on this, it is estimated that my country produces at least 200 million tons of recycled asphalt (RAP) every year. The rational recycling of these RAP materials has huge economic, social and ecological benefits. [0003] At present, the hot recycling of plant mix can effectively realize the recycling of RAP material, and it is one of the main technologies for the recycling of asphalt pavement. In our country, traditional indexes such as dynamic stability, Marshall residual stability, splitting strength ratio, low temperature failu...

AI Technical Summary

Problems solved by technology

However, the existing methods have the following main problems: ①It is only used to evaluate a certain road performance of asphalt mixture, and there is no comprehensive evaluation of the performance; ②The test method is only proposed, but the performance control index is not proposed, so it is difficult to evaluate the performance of recycled asphalt mixture Does the performance meet the requirements

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