生物沥青、岩沥青及复合改性沥青常规性能与流变性能的相关性

为探讨生物沥青改性沥青和岩沥青改性沥青及其复合改性沥青常规性能和流变性能的相关性,对不同掺量的3种改性沥青进行常规使用性能和流变性能试验,并从高温性能、低温性能、可使用温度范围和感温性能等方面进行相关性分析.试验结果与分析表明:3种改性沥青的软化点和当量软化点之间相关性较好,且当量软化点与高温连续分级温度呈显著线性相关;生物沥青改性沥青的当量脆点与低温连续分级温度呈线性相关,另外两种改性沥青则为复杂抛物线关系,应结合两种性能指标综合评价沥青低温性能;3种改性沥青的当量软化点与当量脆点之差和高低温连续分级温度之差之间呈显著线性相关,对沥青可使用温度范围的评价具有一致性;3种改性沥青的针入度指数和复数模量指数之间相关性较好,对感温性能的评价具有一致性.可以通过常规性能指标来合理预估流变性能.

Correlation between Conventional Performance and Rheological Performance of Bio-asphalt, Rock Asphalt and Composite Modified Asphalt

In order to explore the correlation of the evaluation index between the conventional and rheological performance of bio-asphalt modified asphalt, rock asphalt modifier asphalt and its composite modified asphalt binder, the conventional and rheological properties of three kinds of modified asphalts were tested. The correlation analysis was conducted from the aspects of high temperature property, low temperature property, service temperature range and temperature susceptibility. The test results and analyses indicate that the correlation between the softening point and the equivalent softening point of the three kinds of modified asphalt is conspicuous, and the equivalent softening point has a significant linear correlation with the high continuous grading temperature. The linear correlativity between the bio-asphalt modified asphalt''s equivalent breaking point and low continuous grading temperature of bio-asphalt modified asphalt is prominent, while the other two kinds of modified asphalts show complex parabola relation. It is necessary to evaluate the low temperature performance of asphalt comprehensively by combining these two indexes. The difference between the equivalent softening point and equivalent breaking point has a significant linear correlation with that between high continuous grading temperature minus and low continuous grading temperature, and the evaluation of service temperature range of asphalt is consistent. The correlation between penetration index and complex modulus index of three kinds of modified asphalts is noteworthy, and the evaluation of temperature susceptibility performance is consistent. The rheological performance can be estimated reasonably through the conventional performance index.