Glass transition measurements of asphalts by DSC
Glass transition measurements of asphalts by DSC
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DOI：
10.1007/bf01996742
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发表时间：
1997-08
期刊：
影响因子：
--
通讯作者：
G. Memon;B. Chollar
中科院分区：
文献类型：
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作者：
G. Memon;B. Chollar
利用调制差示扫描量热仪(MDSC)测量的玻璃化转变温度(Tg)与沥青在低温下的流动特性以及蠕变硬度的变化率有关，比较了不同沥青(纯沥青、化学改性沥青和胶粉改性沥青)的玻璃化转变温度与蠕变硬度、蠕变刚度变化率以及沥青连续PG级配的低规范温度之间的关系。从原沥青和改性沥青的流变学数据(BBR)和热数据(MDSC)来看，改性产品在较低的温度下具有与相应的原始沥青相同的Fm、S和Tg值的变化。改性沥青和未改性沥青的Tgandm值之间存在相关性。与流变学方法相比，差示扫描量热法(DSC)测量沥青低温性质所用的时间更少，样品更少，测量和操作误差更小，因此TGS有望成为一种快速、简便的实验室方法来获得沥青在路面上的低温使用范围。
The glass transition temperature (Tg), measured by Modulated Differential Scanning Calorimetry (MDSC), is related to the flow characteristics of asphalt at low temperatures as is the rate of change of the creep stiffnessm.This study compared the glass transition temperature of different asphalts (neat, chemically modified, and crumb rubber modified asphalts) with the creep stiffness, the rate of change of creep stiffness, and the low specification temperature of the continuous PG grading of those asphalts. From the rheological data (BBR) and the thermal data (MDSC) for the virgin and the modified asphalts, the modified products had the same variations of values ofm, S, and Tgat lower temperatures as those of their corresponding virgin asphalts. A correlation between the Tgandmvalue was observed for both the modified and unmodified asphalts. Since DSC measurements for asphalt low temperature properties use less operator time, less sample, and have less measurement and operator error than rheological methods, Tghas promise to be considered as a fast and easy laboratory method to obtain the low temperature useful range of asphalts in pavements.