Performance of BF-SBS Modified Asphalt Mortar Based on Rheology
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.
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