Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Preparation and properties of asphalt binders modified by THFS Preparation and properties of asphalt binders modified by THFS extracted from direct coal liquefaction residue extracted from direct coal liquefaction residue
Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Preparation and properties of asphalt binders modified by THFS Preparation and properties of asphalt binders modified by THFS extracted from direct coal liquefaction residue extracted from direct coal liquefaction residue
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以煤直接液化渣为原料提取四氢呋喃可溶馏分改性沥青粘结剂，研究其制备及粘弹性性能。以SK-90（对照沥青粘结剂）和4%、6%、8%和10% THFS （SK-90重量比）配制改性沥青粘结剂。根据正交试验策略和灰色关联分析结果，对沥青粘结剂的制备工艺进行了优化。采用渗透性能等级和Superpave性能等级规范对沥青粘结剂的性能进行了测定。此外，在动态剪切流变仪中进行了温度步进和频率扫描试验，预测了沥青粘结剂的流变特性、温度敏感性和频率敏感性。试验结果表明，最佳制备工艺为剪切温度150℃、剪切时间45 min、剪切速率4000 rpm。随后，THFS的加入有利于提高高温性能，但降低了低温性能和抗疲劳性能。THFS的含量分析表明，4~6%的THFS含量能使沥青粘结剂的高低温性能达到平衡。THFS含量越高的沥青粘结剂抗车辙性能越好，对频率和温度的敏感性越低。
: This paper aims to study the preparation and viscoelastic properties of asphalt binder modified by tetrahydrofuran soluble fraction (THFS) extracted from direct coal liquefaction residue. The modified asphalt binders, which blended with SK-90 (control asphalt binder) and 4%, 6%, 8% and 10% THFS (by weight of SK-90), were fabricated. The preparation process for asphalt binder was optimized in terms of the orthogonal array test strategy and gray correlation analysis results. The properties of asphalt binder were measured by applying Penetration performance grade and Superpave performance grade specifications. In addition, the temperature step and frequency sweep test in Dynamic Shear Rheometer were conducted to predict the rheological behavior, temperature and frequency susceptibility of asphalt binder. The test results suggested the optimal preparation process, such as 150 ◦ C shearing temperature, 45 min shearing time and 4000 rpm shearing rate. Subsequently, the addition of THFS was beneficial in increasing the high-temperature properties but decreased the low-temperature properties and resistance to fatigue. The content analysis of THFS showed the percentage of 4~6% achieved a balance in the high-and-low temperature properties of asphalt binder. The asphalt binder with higher THFS content exhibited higher resistance to rutting and less sensitivity to frequency and temperature.