基于流变学的BF-SBS改性沥青胶浆性能研究
Performance of BF-SBS Modified Asphalt Mortar Based on Rheology
宋世伟 1郭丽香2
作者信息
- 1. 山西省交通新技术发展有限公司,山西 太原 030012
- 2. 山西交科公路勘察设计院有限公司,山西 太原 030032
- 折叠
摘要
为研究玄武岩纤维(BF)对SBS改性沥青流变性能的影响,制备了不同掺量(质量分数为0％、0.2％、0.4％、0.6％、0.8％、1％)玄武岩纤维-(质量分数为4.5％)SBS改性沥青.采用动态剪切流变仪(DSR)对BF-SBS改性沥青进行温度扫描和多重应力蠕变恢复试验(MSCR)以评价其高温流变性能;通过弯曲梁流变试验(BBR)测得的蠕变劲度s、蠕变速率m等指标分析沥青的低温流变性能.结果表明:随着试验温度上升,各掺量BF-SBS改性沥青胶浆的复数剪切模量G*降低,相位角δ增大,表明BF-SBS改性沥青胶浆拥有更好的弹性特性.在各应力水平下,随着BF掺量增加,BF-SBS改性沥青胶浆的不可恢复蠕变量Jnr不断降低,当掺量达到0.4％时,Jnr值降至最低.而R值高于基质沥青与SBS改性沥青胶浆,表明BF能够有效提升SBS改性沥青胶浆在高应力作用下的高温变形恢复能力.蠕变劲度模量s、蠕变速率m低温指标测值表明适量玄武岩纤维对沥青胶浆低温性能有一定提升,其中掺量为0.4％的BF-SBS改性沥青表现出最佳的高、低温流变性能.
Abstract
To study the effect of basalt fiber(BF)on the rheological behavior of SBS-modified asphalt,BF-SBS modified asphalt was prepared with different BF mass fractions(0％,0.2％,0.4％,0.6％,0.8％,1％)and 4.5％SBS.The dynamic shear rheometer(DSR)was used to evaluate the high-temperature performance of BF-SBS modified asphalt by temperature scanning and multiple stress creep recovery test(MSCR).Indexes of creep stiffness s and creep rate m measured by the bending beam rheology test(BBR)were used to analyze the low-temperature rheological behavior.The results show that with the increasing testing temperature,the complex shear modulus G* decreases and the phase angle δ increases,indicating that BF-SBS modified asphalt has an excellent elastic property.At each stress level,as adding more BF,the irrecoverable creep Jnr of BF-SBS modified asphalt mortar decreases continuously,and the Jnr value drops to the lowest at the content of 0.4％.Its R value is higher than that of the matrix asphalt and SBS-modified asphalt mortar,indicating that BF can effectively improve the high-temperature deformation recovery of SBS-modified asphalt mortar under high stress.The measured creep stiffness modulus s and creep rate m at low temperatures indicate that the appropriate amount of BF has improved the low-temperature performance of asphalt mortar,in which the BF-SBS modified asphalt with 0.4％content shows the optimal high-and low-temperature rheological behavior.
关键词
沥青胶浆/流变学性能/玄武岩纤维/SBS改性沥青胶浆Key words
asphalt mortar/rheological behavior/basalt fiber/SBS-modified asphalt mortar引用本文复制引用
出版年
2024
NETL
NSTL
万方数据