ABSTRACT

Road authorities are challenged by traffic-induced vibrations due to their detrimental effects on humans and to the damage of buildings and structures. For this reason, asphalt mixtures designed as damping layer are investigated to resist vibration and noise caused by traffic loads, while a reliable design method to optimise for the mixes needs to be developed and their damping and mechanical properties require corresponding evaluation. In this work, a novel mix-design method special for the damping layer is proposed. Two rubberised asphalt mixtures were designed by optimising their damping properties and their volumetrics were adjusted to accommodate a high content of rubberised bitumen. Tensile strength, rutting resistance, stiffness, loss factor, phase angle and damping ratio were measured to evaluate their mechanical and functional potential as thin damping interlayer in road pavements. Results show that the designed mixes have higher damping capacity than traditional rubberised asphalt mixes. Aside from this, the mixes appear to be rut resistant and show sufficient levels of tensile strength and resistance to water damage.

摘要

由于交通引起的振动对人类的不利影响以及建筑物和结构的损坏，道路管理部门面临着挑战。为此，研究设计为阻尼层的沥青混合料以抵抗交通荷载引起的振动和噪声，同时需要开发一种可靠的设计方法来优化混合料，并对其阻尼和力学性能进行相应的评估。在这项工作中，提出了一种专门用于阻尼层的新型混合设计方法。通过优化阻尼特性设计了两种橡胶沥青混合物，并调整其体积以适应高含量的橡胶沥青。抗拉强度、抗车辙性、刚度、损耗因子、测量了相位角和阻尼比，以评估它们作为道路路面薄阻尼夹层的机械和功能潜力。结果表明，设计的混合料比传统的橡胶沥青混合料具有更高的阻尼能力。除此之外，这些混合物似乎具有抗车辙性能，并显示出足够的抗拉强度和抗水损坏性。