Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (7): 37-40,51.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Dynamic Mechanical Properties of SBS-Modified AsphaIt

Chen Hua-xin  Wang Bing-gang   

  1. Key Laboratory for Special Area Highway Engineering of the Ministry of Education , Chang' an Univ. , Xi'an， 710064， Shaanxi , China
  • Received:2006-09-15 Online:2007-07-25 Published:2007-07-25
  • Contact: 陈华鑫(1973-)，男，副教授，博士，主要从事沥青和沥青混合料材料性能及新材料改性技术研究. E-mail:chx@ gl. chd. edu. cn
  • About author:陈华鑫(1973-)，男，副教授，博士，主要从事沥青和沥青混合料材料性能及新材料改性技术研究.
  • Supported by:

    西部交通建设科技项目(2001-318-000-38 )

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Abstract:

According to the tested results via dynamic shear rheometer for 13 types of SBS-modified asphalts composed of one base-asphalt and 4 styrene-butadiene-styrene (SBS) polymers , the temperature spectra of the original asphalt and the aged asphalt after the rolling thin-film oven test (RTFOT) were compared , and the variation mechanism of the dynamic mechanical properties for the modified asphalts was discussed. Furthermore , the effects of modifier type and dosage on the dynamic mechanical properties were investigated. The results show that the lowternperature dynamic mechanical properties of the modified asphalts depend on the property of the base asphalt , while the high-temperature properties rely on the property of SBS polymers , and that , during the RTFOT aging , there occurs the deterioration and degradation of SBS polymers , which may result in the loss of elastic components of the SBS-modified asphalts and the performance variation of the SBS-modified asphalt like the base asphalt.

Key words: SBS-modified asphalt, dynamic mechanical property, RTFOT aging, temperature spectrum, mechanism