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原文传递 EVALUATION OF RHEOLOGICAL BEHAVIOUR OF SBS MODIFIED BINDERS: SIGNIFICANCE OF LOWER ANGULAR FREQUENCY

题名：	EVALUATION OF RHEOLOGICAL BEHAVIOUR OF SBS MODIFIED BINDERS: SIGNIFICANCE OF LOWER ANGULAR FREQUENCY
正文语种：	eng
作者：	Akanksha Pandey;Sk Sohel Islam;Ransinchung R.N;Sham Ravindranath
作者单位：	Department of Civil Engineering Indian Institute of Technology Roorkee;Department of Civil Engineering Indian Institute of Technology Roorkee;Department of Civil Engineering Indian Institute of Technology Roorkee;Department of Civil Engineering Indian Institute of Technology Roorkee
摘要：	This study demonstrates the critical role of lower angular frequencies (ω) in quantifying the rheological properties of SBS-Modified Binders (SBS_(MBS)). Variables such as SBS dosage, SBS type, additive, and aging conditions have been considered in this study. Modified binders with 2 to 6 wt.% SBS content was prepared, and frequency sweep tests were performed at 60℃ between 100 to 0.01 rad/s in the linear viscoelastic region. The results illustrate that the rheological signature of SBS molecules is predominantly observed at lower frequencies (≤ 0.1 rad/s), due to which the difference among the SBS_(MBS) increases as the angular frequency decreases. Compared to 2 wt.% SBS_(MBS), the complex viscosity at 60℃ of 4 wt.% SBS_(MBS) is higher by ≈ 1.5, 2,4, and 8 times at ω = 10,1,0.1, and 0.01 rad/s, respectively. The sluggish mobility of the SBS molecules and the formation of the interconnected SBS-rich phase are the main reasons for the rheological sensitivity at lower frequencies. Irrespective of SBS type, additive type, and aging conditions, the deviation increases as frequency decreases. The correlation between \|G*\|/sin5 and rutting at ω = 10, 1, 0.1, and 0.01 rad/s is 0.88, 0.97, 0.98, and 0.99, respectively. Similarly, the correlation (R2) of other rheological variables with rutting in asphalt mixes improves significantly at to ≤ 0.1 rad/s. The R2 value approaches a value closer to the correlation between non-recoverable creep compliance (Jnr) and rutting. This study demonstrates that analysis at lower oscillatory frequencies (≤ 0.1 rad/s) better defines the upper service temperature rheological properties of SBS_(MBS). Hence for better grading and improved correlation with mixture performance, we recommend including rheological parameters at a frequency of 0.1 rad/s in IS 15462 PMB grading standard. Simpler rheological parameters, such as complex viscosity and phase angle, should be considered.
出版年：	2023
期刊名称：	Indian Highways
卷：	51
期：	9
页码：	32-43