硫酸钙晶须/SBS复合改性沥青性能研究
Study on performance of calcium sulfate whisker/SBS composite modified asphalt
李雪连 1唐梓涵 2许杰 2李雄2
作者信息
- 1. 长沙理工大学交通运输工程学院,湖南长沙 410114;公路养护技术国家工程实验室(长沙理工大学),湖南长沙 410114;极端环境绿色长寿道路工程全国重点实验室(长沙理工大学),湖南长沙 410114
- 2. 长沙理工大学交通运输工程学院,湖南长沙 410114
- 折叠
摘要
为分析硫酸钙晶须(Calcium Sulfate Whisker,CSW)与苯乙烯-丁二烯-苯乙烯嵌段共聚物(Styrene-buta-diene-styrene Block Copolymer,SBS)复合改性沥青的常规物理性能和高低温流变性,采用沥青三大指标、动态剪切流变(Dynamic Shear Rheology,DSR)和弯曲梁流变(Bending Beam Rheology,BBR)试验,研究了不同CSW掺量对复合改性沥青基本性能和高低温流变性能的影响,并设置CSW改性沥青为对照组.研究结果表明:随着CSW掺量增加,CSW改性沥青的温度敏感性和高温性能提高而低温性能下降;掺量10%CSW改性沥青的针入度指数PI为-0.83,车辙因子G*/sin δ为27.70 kPa,蠕变劲度模量S为368 MPa,蠕变速率m为0.271;CSW/SBS复合改性沥青的温度敏感性和高低温流变性能较CSW改性沥青均明显提高,其中,PI、G*/sin δ和m分别提升了147.0%、82.3%和7.4%,S降低了19.5%.同时,掺量8%CSW/SBS复合改性沥青的高温、低温PG等级分别为82℃和-18℃,比CSW改性沥青的高低温等级分别升了两级和一级.因此,CSW可明显改善沥青的高温性能和温度敏感性,但对沥青低温性能稍微不利,若将其与SBS进行复合改性,可保证沥青的低温性能.
Abstract
In order to investigate the physical and high/low-temperature rheological properties of asphalt modified with cal-cium 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 con-tents 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 as-phalt 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 as-phalt 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-tem-perature 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.
关键词
硫酸钙晶须/改性沥青/高温性能/低温性能/温度敏感性Key words
calcium sulfate whiskers/modified asphalt/high-temperature performance/low-temperature performance/tem-perature sensitivity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据