Influence of direct coal liquefaction residue on viscoelastic properties of asphalt mortar
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摘要: 以SK-90沥青为基质沥青, 分别制备粉胶比为1.0、煤直接液化残渣(DCLR)掺量(质量分数)分别为5%、10%、15%、20%下的DCLR改性沥青胶浆和SK-90沥青胶浆。采用动态剪切流变试验和弯曲梁流变试验, 对比分析了DCLR对沥青胶浆车辙因子、疲劳因子、蠕变劲度模量和蠕变速率等因素的影响, 揭示了DCLR对沥青胶浆黏弹性能的影响规律。试验结果表明: DCLR会显著增强沥青胶浆的高温性能, 降低沥青胶浆的低温性能和疲劳性能; DCLR提高了沥青胶浆在高温条件下的弹性及在低温条件下的黏性; 在高DCLR掺量下, 沥青胶浆的高温、低温和疲劳性能对温度的敏感度极为显著; 随着DCLR掺量的增加, 沥青及胶浆的适用范围越来越窄; 从应用角度考虑, 建议DCLR掺量不宜大于10%, 沥青及胶浆可适用于沥青路面的中面层。Abstract: SK-90 was taken as base asphalt, filler-asphalt ratio was 1.0, the direct coal liquefaction residue(DCLR)modified asphalt mortars with the DCLR contents as 5%, 10%, 15%, 20% and SK-90 asphalt mortar were produced respectively.The influences of DCLR on asphalt mortar rut factor, fatigue factor, creep stiffness modulus and creep rate were compared by dynamic shear rheometer(DSR)and bending beam rheometer(BBR)tests.The influence rule of DCLR on the viscoelastic properties of asphalt mortar was analyzed.Test result indicates that DCLR can significantly improve the high-temperature properties of asphalt mortar, reduce its lowtemperature and fatigue properties.DCLR also increases the elastic properties of asphalt mortar at high temperature and the viscous properties at low temperature.The high-temperature, lowtemperature and fatigue properties of asphalt mortar with high DCLR content are very sensitive to temperature.With the increase of DCLR content, the application scopes of asphalt and asphaltmortar become more and more narrow.Therefore, in the view of application, the content of DCLR is recommended to be less than 10%, and the asphalt and asphalt mortar can be applied for middle surface layer of asphalt pavement.
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表 1 SK-90沥青的性能
Table 1. Properties of SK-90
表 2 SK-90沥青的组分
Table 2. Compositions of SK-90
表 3 矿粉性能
Table 3. Properties of mineral powder
表 4 DCLR性能
Table 4. Properties of DCLR
表 5 DCLR的组分和元素组成
Table 5. Compositions and elements of DCLR
表 6 DCLR改性沥青的性能
Table 6. Properties of DCLR modified asphalts
表 7 DCLR改性沥青的组分
Table 7. Compositions of DCLR modified asphalts
表 8 回归系数A1、B1值
Table 8. Values of regression coefficients A1and B1
表 9 沥青胶浆的GT值
Table 9. GT values of asphalt mortars kPa·℃-1
表 10 0不同沥青胶浆的疲劳因子
Table 10. Fatigue factors of different asphalt mortars
表 11 1回归系数A2、B2值
Table 11. Values of regression coefficients A2and B2
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