End-performance evaluation of thiourea-modified bituminous binders through viscous flow and linear viscoelasticy testing
End-performance evaluation of thiourea-modified bituminous binders through viscous flow and linear viscoelasticy testing
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DOI：
10.1007/s00397-012-0671-5
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发表时间：
2013-01
期刊：
影响因子：
2.3
通讯作者：
A. Cuadri;M. García-Morales;F. Navarro;G. Airey;P. Partal
中科院分区：
文献类型：
--
作者：
A. Cuadri;M. García-Morales;F. Navarro;G. Airey;P. Partal
直馏沥青不再适用于新的沥青混合料。因此，改性沥青的使用变得更加重要。为了提高粘合剂的机械性能并防止其在高温储存时发生相分离，铺路行业目前正在开发基于反应剂的新改性路线。这项工作研究了硫脲的使用，事实证明硫脲可以有效地拓宽粘合剂表现出足够性能的温度区间。一方面，粘性流动和动态剪切测试表明高使用温度强度得到增强，同时热敏感性降低。另一方面，动态弯曲测试的结果表明粘合剂玻璃化转变温度显着降低。最后，建议使用主曲线和进一步的频率/温度转换，以获得低温下沥青粘合剂的合适的粘弹性特性。
Straight-run bitumens are no longer suitable in new asphalt mixtures. Consequently, the use of modified bitumens has become more important. In order to both improve binders’ mechanical properties and prevent it from phase separation whilst stored at high temperature, the paving industry is currently developing new modification routes based on reactive agents. This work studies the use of thiourea, which has proven to efficiently broaden the temperature interval over which the binder demonstrates an adequate performance. On the one hand, viscous flow and dynamic shear tests indicate an enhancement in the high in-service temperature strength, along with a reduced thermal susceptibility. On the other hand, results of dynamic flexural tests reveal a significant decrease in the binder glass transition temperature. Finally, the use of master curves and a further frequency/temperature conversion are proposed, in order to attain a suitable viscoelastic characterisation of bituminous binders at low temperatures.