| 1ST CONFERENCE ON RESEARCH AND APPLICATION OF ADVANCED CEMENTITIOUS MATERIALS |
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| Re-modification Recycling Process and Mechanism of Aged SBS Modified Asphalt |
| YAO Xiaoguang1, 2, ZHANG Wanlei2, ZHANG Zhengqi3, LI Peilong3
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1 School of Geographic Information and Tourism, Chuzhou University, Chuzhou 239000;
2 Jiangsu Sinoroad Engineering Research Institute, Nanjing 211800;
3 Key Laboratory of Highway Engineering in Special Region of Ministry of Education, Chang’an University,Xi’an 710064 |
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Abstract To study the re-modified recycling effect of SBS modified asphalt and compare the influence of different recycling process, the SBS modified asphalt aging simulation method was selected by the routine test and the SHRP test firstly in this paper. Then three kinds of processes were researched about recycling method that adding SBS modifier and new asphalt. On the basis of infrared spectrum test, the influence of different processes on recycling effect of aging SBS modified asphalt were analyzed. Finally, the optimal ratio and best process were determined, which including the content of SBS modifier, the ratio of new to old asphalt. The results showed that using RTFOT experiment in aging simulation is more convenient and scientific. The indicators of SBS modified asphalt after five hours RTFOT experiment accords with the asphalts applied for seven years. And the addition order between the SBS modifier and the new asphalt is closely related to the recycling effect of aging asphalt. The best process is that preparing modified asphalt with SBS modifier and new asphalt firstly, then mixing the modified asphalt and aging asphalt, with 4% SBS modifier and the ratio of new and old asphalt of 2.
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Published: 08 May 2018
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2017, Vol. 31 
