沥青性能的DSC评价方法

应用DSC（differential scanning calorimetry）方法测定原样沥青聚集状态改变时的热量变化，以及沥青在不同老化程度下和掺加蜡含量不同时的热稳定性及变化程度，定性评价了不同沥青的温度稳定性和高温性能。结果表明，从DSC测试的热量变化可发现沥青经过改性后，温度稳定性提高了，吸热峰能量值减少了50％以上，感温性降低了；沥青分别经过旋转薄膜烘箱和PAV老化后，吸热峰能量值减少了40％以上，表明经过程度不同的老化试验，沥青的热稳定性更好；含蜡量越低，温度稳定性越好。DSC方法与沥青高温常规试验结果对比表明，沥青吸热峰的能量值和沥青的高温指标试验结果之间有较好的相关性和一致性，说明应用DSC评价方法可以从微观上验证与判断沥青的高温性能。

Evaluation method of differential scanning calorimetry for asphalt performance

In order to evaluate the high temperature performances of different asphalts, asphalt heat quantity was measured when the assembling state of original asphalt changed, and asphalt heat stabilities and change extents under different aging extents and paraffin wax contents were measured by DSC method. The result indicates that asphalt temperature stability is improved, asphalt temperature sensitivity is reduced after asphalt is modified; asphalt aging time is longer, asphalt heat stability is better; the lower asphalt paraffin wax content is, the better asphalt temperature sensitivity is. The testing results of DSC method and general high temperature index experiment are consistent, their relativity is good, DSC method is a better method to verify and evaluate asphalt high temperature performance. 4 tabs, 9 figs, 8 refs.