Study on the regeneration mechanism of SBS modified asphalt based on DSR and FTIR

Abstract

Abstract: In order to investigate the high and low temperature properties of SBS modified bitumen and the changes of functional groups after aging and regeneration, this paper tested the high and low temperature properties of bitumen based on softening point test, dynamic shear rheology test (DSR), multi-stress repetitive creep test (MSCR) and bending beam rheology test (BBR), and investigated the changes of characteristic peaks and functional groups using infrared spectroscopy (FTIR). The results show that: the ageing process of SBS modified bitumen includes not only the ageing of asphalt but also the ageing degradation of SBS modifier, the softening point, G^*, G^*/sin δ and R decrease, δ and Jnr increase, the low temperature performance is improved, but the high temperature resistance is decreased, and the increase in the amount of regenerant will make this phenomenon more obvious. Under the same conditions, the sensitivity of the high temperature performance of the recycled SBS modified bitumen to the stress level is weaker than that of the original SBS modified bitumen; in addition, the results of the infrared spectroscopy tests show that the effect of the recycled agent on the repair of SBS modified bitumen is limited.

Key words: SBS modified asphalt, aging, regeneration, rheological properties, infrared spectroscopy

CLC Number:

U414

WANG Zhao-li, LIN Mei, WANG Guo-wei, LEI Yu-tao, ZHANG Lei. Study on the regeneration mechanism of SBS modified asphalt based on DSR and FTIR[J]. Journal of Lanzhou University of Technology, 2024, 50(6): 127-134.

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