Haibing Huang, Zujie Xu, Enjiu Zeng, Bin Liu, Wen Xu
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引用次数: 0
Abstract
Emulsified asphalt has become a popular green material in modern road construction due to its environmentally friendly and energy-saving characteristics. The method of obtaining residues is crucial for accurately evaluating the performance of emulsified asphalt and ensuring the quality of road construction. The evaporated residues of 3% and 6% SBR modified emulsified asphalt and 6% SBS modified emulsified asphalt were obtained by the low-temperature evaporation (LTE) method and the direct heating (DH) method, respectively. The rheological properties of the modified asphalt residues were tested by the temperature frequency sweeping (TFS), multi-stress creep recovery (MSCR), and linear amplitude sweeping (LAS) tests using the dynamic shear rheometer (DSR), and their aging resistance in the form of carbonyl index was measured by the Fourier infrared spectroscopy (FTIR). The test results showed that, as compared to the DH method, the SBR modified emulsified asphalt residue obtained by the LTE method had higher elastic recovery rate, lower irrecoverable creep compliance, smaller accumulated performance deformation, longer fatigue life, and higher aging resistance, indicating that the LTE method using the low-temperature curing conditions (25°C, 24 h—60°C, 24 h) is more suitable for curing the SBR modified emulsified asphalt. However, the opposite trends of the performance indices except the aging resistance were observed for the SBS modified emulsified asphalt residue obtained from the LTE method, showing that the high-temperature curing condition (120°C, 30 min—163°C, 1 min) can give the SBS modified asphalt residue better rheological properties and higher fatigue resistance performance, but it also has the disadvantage of weakening the aging resistance. Therefore, in practical application, an appropriate curing temperature should be selected to condition the SBS modified emulsified asphalt for balancing its rheological performance and aging resistance.
乳化沥青因其环保、节能的特点,已成为现代道路建设中广受欢迎的绿色材料。残留物的获取方法对于准确评价乳化沥青的性能、确保道路施工质量至关重要。分别采用低温蒸发(LTE)法和直接加热(DH)法获得了 3% 和 6% SBR 改性乳化沥青和 6% SBS 改性乳化沥青的蒸发残渣。利用动态剪切流变仪(DSR)通过温度频率扫描(TFS)、多应力蠕变恢复(MSCR)和线性振幅扫描(LAS)测试了改性沥青残留物的流变特性,并通过傅里叶红外光谱(FTIR)测量了它们以羰基指数形式表示的抗老化性。试验结果表明,与DH法相比,LTE法得到的SBR改性乳化沥青残渣具有更高的弹性恢复率、更低的不可恢复蠕变顺应性、更小的累积性能变形、更长的疲劳寿命和更高的抗老化性能,表明采用低温固化条件(25℃、24小时-60℃、24小时)的LTE法更适合固化SBR改性乳化沥青。然而,LTE 法得到的 SBS 改性乳化沥青残渣除抗老化性能外,其他性能指标的变化趋势正好相反,这表明高温固化条件(120°C,30 分钟-163°C,1 分钟)可使 SBS 改性沥青残渣具有更好的流变性能和更高的抗疲劳性能,但也存在削弱抗老化性能的缺点。因此,在实际应用中,应选择合适的固化温度来调节 SBS 改性乳化沥青,以平衡其流变性能和抗老化性能。