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

作　　者：宋世伟 郭丽香 SONG Shiwei;GUO Lixiang(Shanxi Transportation New Technology Development Co.,Ltd.,Taiyuan,Shanxi 030012,China;Shanxi Jiaoke Highway Survey&Design Institute Co.,Ltd.,Taiyuan,Shanxi 030032,China)

机构地区：[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

出　　处：《山西交通科技》2024年第1期14-18,共5页Shanxi Science & Technology of Transportation

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J_(nr)不断降低,当掺量达到0.4%时,J_(nr)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。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 angleδincreases,indicating that BF-SBS modified asphalt has an excellent elastic property.At each stress level,as adding more BF,the irrecoverable creep J_(nr) of BF-SBS modified asphalt mortar decreases continuously,and the J_(nr) 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 

分 类 号：U414.75[交通运输工程—道路与铁道工程]