ABSTRACT

Pavement structures must guarantee safety, trafficability and comfort to highways users during its service life. The quality of these parameters is related to distresses that may occur as surface distortions, that might be caused by mechanical behaviour problems and to surface texture, which also affect highway safety. The surface texture is evaluated by parameters such as microtexture and macrotexture, related to aggregate rugosity and mixture characteristics, respectively. Both mechanical behaviour and surface texture can be affected by the compaction method of the mixture, as it affects the internal structure and the internal friction between aggregate particles, resulting in alterations in the permanent deformation resistance and surface aspects of the mixture. Hence, this paper proposed a new laboratory compaction method, using roller compaction with vibration, considering three aggregate gradations. This study evaluated the effect of the laboratory compaction method in the permanent deformation resistance and the surface texture of samples, comparing to field mixtures. The proposed compaction method presented efficiency for dense-graded mixture. The mixture's performance regarding mechanical behaviour and surface texture according to the compaction method variation was also dependent on the aggregate gradation. Mixtures with a discontinuity on the gradation presented a negative impact due to the vibration process.

摘要

路面结构必须在其使用寿命期间保证高速公路使用者的安全性、通行性和舒适性。这些参数的质量与表面变形（可能由机械性能问题引起）和表面纹理有关，这些问题也可能影响公路安全。表面纹理通过微观纹理和宏观纹理等参数进行评估，分别与骨料的粗糙度和混合物特性相关。混合物的压实方法会影响机械性能和表面纹理，因为它会影响内部结构和骨料颗粒之间的内摩擦，从而导致混合物的永久变形阻力和表面方面发生变化。因此，本文提出了一种新的实验室压实方法，考虑到三个骨料级配，使用振动碾压。本研究与现场混合物相比，评估了实验室压实方法对样品的永久变形阻力和表面纹理的影响。所提出的压实方法对稠密级配混合物具有效率。根据压实方法的变化，混合物在机械性能和表面纹理方面的性能也取决于骨料级配。由于振动过程，在渐变上具有不连续性的混合物呈现出负面影响。所提出的压实方法对稠密级配混合物具有效率。根据压实方法的变化，混合物在机械性能和表面纹理方面的性能也取决于骨料级配。由于振动过程，在渐变上具有不连续性的混合物呈现出负面影响。所提出的压实方法对稠密级配混合物具有效率。根据压实方法的变化，混合物在机械性能和表面纹理方面的性能也取决于骨料级配。由于振动过程，在渐变上具有不连续性的混合物呈现出负面影响。