沥青低温粘弹性能的预测

Prediction of low temperature viscoelastic properties of asphalt

鉴于弯曲梁流变仪和动态剪切流变仪在研究沥青低温粘弹性能时存在一定局限性,通过动态剪切流变仪测定常温下沥青的动态粘弹性能,利用时温转换原则和沥青动静态粘弹函数的转换关系,转换为沥青的低温粘弹性能,与弯曲梁流变仪在低温下直接测定的低温蠕变性能相比较,分析了两者试验结果的相关性。结果表明,通过常温下沥青的动态粘弹性能可以很好地预测沥青的低温粘弹性能,并且可以得到更宽广的时间范围内沥青的低温粘弹性能。

There are some means of the bending beam imitations in studying the low rheometer（BBR） and the dyna of asphalt were tested by DSR at normal temperature and were converted to the viscoelastic properties at low temperature properties of the asphalt by mic shear rheometer（DSR）, so the samples the obtained dynamic theological properties temperature using the time-temperature transformation principle and the transformation relation between the static and dynamic viscoelastic functions. The results obtained by such a indirect way were compared with the low temperature properties obtained directly by the BBR, and their interrelationship was analyzed. The results showed that the DSR data at normal temperature can be used to predict the low temperature behavior of the asphalt. Therefore, it is possible to get the viscoelastic properties of the asphalt over a much larger time interval than those measured at low temperature.