耦合老化条件下沥青性能与分子结构特征分析
发布时间：2019-06-20 15:20
【摘要】：为了构建耦合老化条件下沥青宏观性能与微观分子结构特征的相关关系,分别通过针入度、延度、软化点和黏度试验,测试不同老化条件下基质沥青和SBS改性沥青宏观常规性能,通过FTIR(红外光谱)和H-NMR(核磁共振氢谱)试验测试沥青的微观分子结构;采用灰色系统理论计算耦合老化条件下沥青宏观常规性能与微观分子结构的关联程度,并给出其拟定模型公式。研究结果表明:随着老化程度及老化时间的增加,沥青各项宏观常规性能逐渐劣化,羰基指数CI和亚砜基指数SI逐渐增大,沥青发生化学键断裂和氧化加成反应,丁二烯指数BI逐渐减小,SBS改性剂发生—C滢C—双键降解反应;线形SBS改性沥青芳香环发生异构化脱烷,基质沥青与星形SBS改性沥青芳香环先发生脱氢缩合,然后发生异构化脱烷;基质沥青和SBS改性沥青脂肪族区均发生结构异化,基质沥青脂肪侧链长度不断减小,星形SBS改性沥青侧链长度逐渐增加,线形SBS改性沥青侧链长度先减小后增加;从沥青各项宏观性能和微观分子结构特征的变化趋势以及两者灰色关联度的计算结果看,SBS改性剂能够显著提高沥青抗老化性能,且不同类型SBS改性剂对常用基质沥青抗老化性能的改善效果相当;耦合老化条件下沥青的微观分子结构变化与基质沥青软化点的关联最显著,与SBS改性沥青软化点、针入度和5℃延度的关联最显著。通过沥青宏观常规性能指标可以预测沥青微观分子结构的变化规律。
[Abstract]:In order to construct the correlation between macroscopical properties and microscopic molecular structure characteristics of asphalt under coupled aging conditions, the macroscopic conventional properties of matrix asphalt and SBS modified asphalt under different aging conditions were tested by penetration, ductility, softening point and viscosity tests, and the microscopic molecular structure of asphalt was tested by FTIR (infrared spectroscopy) and H-NMR (nuclear magnetic resonance hydrogen spectroscopy) tests. The grey system theory is used to calculate the correlation between the macroscopic conventional properties and the microscopic molecular structure of asphalt under the condition of coupled aging, and the formula of the model is given. The results show that with the increase of aging degree and aging time, the macroscopic conventional properties of asphalt gradually deteriorate, the carbonyl index CI and sulfoxide index SI increase gradually, the chemical bond fracture and oxidation addition reaction take place in asphalt, the Butadiene index BI decreases gradually, and the degradation reaction of-C ying C-double bond occurs in SBS modifier. The aromatic ring of linear SBS modified asphalt is isomerized and dealkane, the aromatic ring of matrix asphalt and star-shaped SBS modified asphalt is dehydrocondensation first, and then isomerization dealkylation occurs. The aliphatic side chain length of matrix asphalt and SBS modified asphalt is dissimilated, the fat side chain length of matrix asphalt decreases, the side chain length of star-shaped SBS modified asphalt increases gradually, and the side chain length of linear SBS modified asphalt decreases at first and then increases. According to the changing trend of macroscopic properties and microscopic molecular structure characteristics of asphalt and the calculation results of grey correlation degree between them, SBS modifier can significantly improve the anti-aging performance of asphalt, and different types of SBS modifiers have the same effect on the anti-aging performance of common matrix asphalt. Under the condition of coupling aging, the relationship between the microscopic molecular structure of asphalt and the softened point of matrix asphalt is the most significant, and that of SBS modified asphalt is the most significant, and the correlation between the micromolecular structure of asphalt and the softened point, penetration degree and 5 鈩，
本文编号：2503325
[Abstract]:In order to construct the correlation between macroscopical properties and microscopic molecular structure characteristics of asphalt under coupled aging conditions, the macroscopic conventional properties of matrix asphalt and SBS modified asphalt under different aging conditions were tested by penetration, ductility, softening point and viscosity tests, and the microscopic molecular structure of asphalt was tested by FTIR (infrared spectroscopy) and H-NMR (nuclear magnetic resonance hydrogen spectroscopy) tests. The grey system theory is used to calculate the correlation between the macroscopic conventional properties and the microscopic molecular structure of asphalt under the condition of coupled aging, and the formula of the model is given. The results show that with the increase of aging degree and aging time, the macroscopic conventional properties of asphalt gradually deteriorate, the carbonyl index CI and sulfoxide index SI increase gradually, the chemical bond fracture and oxidation addition reaction take place in asphalt, the Butadiene index BI decreases gradually, and the degradation reaction of-C ying C-double bond occurs in SBS modifier. The aromatic ring of linear SBS modified asphalt is isomerized and dealkane, the aromatic ring of matrix asphalt and star-shaped SBS modified asphalt is dehydrocondensation first, and then isomerization dealkylation occurs. The aliphatic side chain length of matrix asphalt and SBS modified asphalt is dissimilated, the fat side chain length of matrix asphalt decreases, the side chain length of star-shaped SBS modified asphalt increases gradually, and the side chain length of linear SBS modified asphalt decreases at first and then increases. According to the changing trend of macroscopic properties and microscopic molecular structure characteristics of asphalt and the calculation results of grey correlation degree between them, SBS modifier can significantly improve the anti-aging performance of asphalt, and different types of SBS modifiers have the same effect on the anti-aging performance of common matrix asphalt. Under the condition of coupling aging, the relationship between the microscopic molecular structure of asphalt and the softened point of matrix asphalt is the most significant, and that of SBS modified asphalt is the most significant, and the correlation between the micromolecular structure of asphalt and the softened point, penetration degree and 5 鈩，
本文编号：2503325
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