Inorganic Chemicals Industry ›› 2024, Vol. 56 ›› Issue (9): 82-89.doi: 10.19964/j.issn.1006-4990.2023-0572

• Research & Development • Previous Articles     Next Articles

Study on performance of calcium sulfate whisker/SBS composite modified asphalt

LI Xuelian1,2,3(), TANG Zihan1, XU Jie1, LI Xiong1   

  1. 1.Changsha University of Science and Technology,School of Traffic and Transportation Engineering,Changsha 410114,China
    2.National Engineering Laboratory of Highway Maintenance Technology,Changsha 410114,China
    3.National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment,Changsha 410114,China
  • Received:2023-11-30 Online:2024-09-10 Published:2024-09-26

Abstract:

In order to investigate the physical and high/low-temperature rheological properties of asphalt modified with calcium sulfate whisker(CSW) and styrene-butadiene-styrene block copolymer(SBS),three major indicators,dynamic shear rheology(DSR),and bending beam rheology(BBR) tests were conducted to investigate the effects of different CSW contents on this composite modified asphalt.Meanwhile,CSW-modified asphalt was set as a control group.The results showed that with the increase of CSW content,the temperature sensitivity and high-temperature performance of CSW-modified asphalt were increased while the low-temperature performance decreased.The penetration index(PI),rutting factor G*/sin δ,creep modulus S,and creep rate m of the CSW-modified asphalt with 10% CSW were -0.83,27.70 kPa,368 MPa,and 0.271,respectively.The temperature sensitivity and high/low-temperature rheological properties of CSW/SBS modified asphalt were significantly improved compared with those of CSW-modified asphalt.PI,G*/sin δ,and m were improved by 147.0%,82.3%,and 7.4%,respectively.But S was decreased by 19.5%.At the same time,the high-temperature and low-temperature PG of the CSW/SBS modified asphalt with 8% CSW were 82 ℃ and -18 ℃,respectively,which were elevated by two and one levels,respectively.Therefore,the high-temperature performance and temperature sensitivity of asphalt binders could be significantly improved by the addition of CSW,but the low-temperature performance was slightly decreased.The low-temperature performance of asphalt binders could be maintained while CSW was composited with SBS.

Key words: calcium sulfate whiskers, modified asphalt, high-temperature performance, low-temperature performance, temperature sensitivity

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