泡沫沥青:生产沥青混合料的另一种方法

Liliana Abreu , Joel Oliveira , Hugo Silva , Catarina Silva , Daniela Palha , Paulo Fonseca
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引用次数: 7

摘要

由于不断需要改进和使沥青混合料的生产更具可持续性,新的生产技术已经开发出来,其实施意味着对其性能的正确认识。泡沫沥青是最有前途的沥青生产技术之一。然而,了解这种粘结剂在经受膨胀过程时的表现是很重要的。泡沫沥青的体积损失可以通过衰减曲线来解释,从而可以确定加入沥青的理想温度和含水量,以确保沥青与骨料混合的适当条件。在本研究中,对传统的160/220笔级沥青进行了不同温度和含水量的测试,得出生产泡沫沥青的最佳温度为150℃,对应的粘度为0.1 Pa.s。含水量主要影响沥青泡沫的半衰期,因此含水量越高,体积缩小越快。
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Foamed bitumen: an alternative way of producing asphalt mixtures

With the constant need to improve and make the production of asphalt mixtures more sustainable, new production techniques have been developed, the implementation of which implies the correct knowledge of their performance. One of the most promising asphalt production techniques is the use of foamed bitumen. However, it is essential to understand how this binder will behave when subjected to the expansion process. The loss of volume of the foamed bitumen could be translated by a decay curve, which allows to determine the ideal temperature and water content added to the bitumen in order to assure adequate conditions to the mix the bitumen with the aggregates. On the present study, a conventional 160/220 pen grade bitumen was tested by using different temperatures and water contents, and it was concluded that the optimum temperature for the production of foamed bitumen (with the studied bitumen) is 150 °C, which corresponds to a viscosity of 0.1 Pa.s. The water content mostly influence the half-life of the bitumen foam, resulting in quicker volume reductions for higher water contents.

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