沥青低温性能的差示扫描量热法研究

Study on the low temperature performance of asphalt using differential scanning calorimetry method

在综合分析现有评价SBS改性沥青低温性能指标的基础上,选择使用玻璃化转变温度Tg作为碳纳米管/SBS改性沥青的低温性能的评价指标。对于现有的不同测量Tg的方法,采用更为精确的测量方法—差示扫描量热法(DSC)。结果表明,用DSC法测得的玻璃化转变温度Tg,物理意义明确,测试方法简便,该数值的降低也与样品低温性能的提高能够较好地吻合,更适合作为评价各类改性沥青低温性能的评价指标。

Based on the comprehensive analysis of evaluation standards of the low temperature of asphalt, we chose glass transition temperature （Tg） as the better standard. Comparing the methods of measuring Tg, we used differential scanning calorimetry method（DSC） in our laboratory. The result shows that the Tg measured by DSC gave specific physical information. This test method is easy to operate. The reduce of the value of Tg agrees with the improvement of low temperature of the asphalt. From the above, we think that the Tg measured by DSC is a better standard for the low temperature performance of asphalt.