JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (2): 46-52.doi: 10.6040/j.issn.1672-3961.0.2016.488

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Migration behavior of reclaimed mineral aggregate in process of central plant hot recycling

GUO Dedong1,2, ZHANG Shengtao2, LI Jin2, ZHANG Long2, ZHANG Xibin2   

  1. 1. Shandong Provincial Engineering Laboratory of Transportation Safety and Emergency Support Technology, Jinan 250357, Shandong, China;
    2. School of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China
  • Received:2016-12-26 Online:2018-04-20 Published:2016-12-26

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Abstract: To improve the qulity of central plant hot recycling asphalt mixture, a test was designed, including key procedures such as fabricating reclaimded asphalt pavement(RAP), separating new aggregate from mixture and testing migration quantity. By in-laboratory tests, the influences of mixing amount of RAP, mixing time and asphalt content on migration quantity of reclaimed aggregates were evaluated. The results indicated that the reclaimed fine particle mineral aggregates could not disengage from the coarse ones totally during the mixing process of hot recycling asphalt mixture, and the migration quantity of that was about 55% to 75%; the mixing amount of RAP would not change the migration quantity, but longer mixing time and more asphalt content could improve the migration quantity. Migration of reclaimed mineral aggregates would be accelerated by lengthening mixing time properly, adding new asphalt or recycling agent and increasing asphalt content, resulting uniformity of central plant hot asphalt pavement.

Key words: magnetite aggregate, asphalt mixture, migration quantity, road engineering, central plant hot recycling, reclaimed mineral aggregate, migration behavior

CLC Number: 

  • U416
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