Evaluation of the Ultra-Light Inertial Profiler (ULIP) for Measuring Surface Texture of Pavements.

摘要

The NCAT test track comprises a range of different mixtures types with varying surface textures. The macrotextures of the surface mixtures on the track were measured following the suspension of trafficking operations (as part of the Phase 2 experiment) using the ASTM sand patch and circular texture meter (CTM) methods as well as with the new ultra-light inertial profiler (ULIP). An excellent correlation was found between the macrotexture measurements of the NCAT sections using these three devices. The ULIP has an advantage over the sand patch and CTM methods in that the macrotexture of a stretch of road can be measured instead of spot measurements. This allows the definition of texture wavelength spectra that can be used to calculate the ISO texture wavelength parameters L4 and L63. These parameters are reportedly related to noise levels generated at the pavement-tire interface. Past studies at NCAT have indicated that noise at the pavement-tire interface is not overly influenced by surface macrotexture or mixture gradation parameters such as fineness modulus. A statistical analysis of variance was done to relate noise levels measured on the different sections at the NCAT track with texture parameters measured with the ULIP and mixture gradation properties. Once again, no definitive relationship between sound pressure as measured at the pavement-tire interface and the material factors was observed.