Hydrated lime has been used in hot mix asphalt (HMA) to reduce moisture sensitivity and stripping since 1910 in the United States. During the past 40 years, researchers from all over the world have focused on this topic finding that hydrated lime can actually provide many other benefits to asphalt mixtures. In this paper, the use of a high surface area (HSA) hydrated lime as a filler in asphalt mixtures was investigated to assess the influence of lime microstructure on mixtures cracking behaviour. Two different open-graded friction course (OGFC) asphalt mixtures were prepared using different types of filler (calcium carbonate, calcium carbonate + hydrated lime and calcium carbonate + HSA hydrated lime) and tested using the SuperPave indirect tensile test protocol. The cracking behaviour of the mixtures was evaluated according to the HMA fracture mechanics approach developed at the University of Florida. The results show that HSA hydrated lime is able to improve the fracture performance of OGFC mixtures, even more significant than the traditional one.

自 1910 年在美国起，熟石灰就已用于热拌沥青 (HMA) 以降低湿气敏感性和剥离现象。在过去的 40 年里，来自世界各地的研究人员集中在这个主题上，发现熟石灰实际上可以为沥青混合料提供许多其他好处。在本文中，研究了使用高表面积 (HSA) 熟石灰作为沥青混合料中的填料，以评估石灰微观结构对混合料开裂行为的影响。使用不同类型的填料（碳酸钙、碳酸钙 + 熟石灰和碳酸钙 + HSA 熟石灰）制备两种不同的开级配摩擦层 (OGFC) 沥青混合物，并使用 SuperPave 间接拉伸测试协议进行测试。根据佛罗里达大学开发的 HMA 断裂力学方法评估混合物的开裂行为。结果表明，HSA熟石灰能够提高OGFC混合物的压裂性能，甚至比传统的更显着。