Journal of Dalian Maritime University >

2018 , Vol. 44 >Issue 3: 79 - 87

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2018.03.012

Rheological properties of rock asphalt composite modified asphalt

  • LI Wei ,
  • GUO Nai-sheng ,
  • JIAO Bo-zong ,
  • WANG Lin
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  •  (Transportation Engineering College , Dalian Maritime University, Dalian 116026,China)

Received date: 2018-04-13

  Revised date: 2018-05-24

  Online published: 2024-06-27

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Abstract

In order to improve the rheological properties of rock asphalt modified asphalt to be better employed in practical engineering, the crumb rubber/rock asphalt composite modified asphalt (CR/RACMA) and SBS/rock asphalt composite modified asphalt (SBS/RACMA）were produced with different contents of crumb rubber, SBS and rock asphalt, respectively. A comparative performance evaluation of rock asphalt composite modified asphalt was conducted by laboratory tests, in which the penetration, softening point and viscosity tests were employed to screen the composition scheme of modified additives, and then the rheological properties of rock asphalt composite modified asphalt were studied by using the dynamic shear rheometer (DSR) with temperature and frequency sweep, and bending beam rheometer (BBR) tests, the effectiveness of timetemperature superposition principle and viscoelasticity characteristics were discussed for the rock asphalt composite modified asphalt by the Black curve, also, the multiple stress creep recovery (MSCR) test was performed to evaluate the resistance to permanent deformation of rock asphalt composite modified asphalt. The results show that the CR/RACMA exhibits high temperature performance and temperature sensibility better than the SBS/RACMA. The CR/RACMA performs superior PG grade than the SBS/RACMA, and the CR/RACMA containing 18% crumb rubber and 5% rock asphalt performs the best PG grading among the all of tested asphalt binders. The SBS/RACMA indicates obvious timetemperature dependence by the Black curve analysis, however, the timetemperature superposition principle can not be employed in the CR/RACMA investigated. The CR/RACMA shows a higher elastic component and smaller nonrecoverable strain than the SBS/RACMA. The CR/RACMA both containing 18% crumb rubber / 5% rock asphalt, and 14% crumb rubber / 12% rock asphalt exhibit the approximate resistance to permanent deformation. The 18% crumb rubber and 5% rock asphalt in the rock asphalt composite asphalt are proposed as proper composition by the rheological properties tests analysis.

Key words： rock asphalt; rheological properties; DSR test; SBS/crumb rubber; Black curve; permanent deformation

Cite this article

LI Wei , GUO Nai-sheng , JIAO Bo-zong , WANG Lin . Rheological properties of rock asphalt composite modified asphalt[J]. Journal of Dalian Maritime University, 2018 , 44(3) : 79 -87 . DOI: 10.16411/j.cnki.issn1006-7736.2018.03.012

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