Abstract
Recent advances in technology allowed for the use of laser-based systems that can directly measure macrotexture properties of various surfaces. Volumetric or sand patch method has historically been used as the main technique for measuring macrotexture. Different available methods do not all measure the same surface properties and often generate different measurements. Thus, it is crucial to determine the most suitable method for measuring surface macrotexture. This paper investigates mean profile depth measurements from three laser based macrotexture measuring devices, including a laser profiler, a laser texture scanner and a circular texture meter. The results are compared with mean texture depth obtained from volumetric sand patch tests. Experiments were conducted to measure macrotexture of 26 laboratory specimens, which included asphalt and Portland cement concrete samples of various type and finish, as well as other common manufactured textured samples. Based on the evaluation of experimental data collected in this study, relationships are recommended to predict standard macrotexture using the mean profile depth data measured by a laser equipment or scanner.
Highlights
Macrotexture is a measurement that can be used to quantify texture, roughness and friction characteristics of the roads and other surfaces
The Dynatest laser profiler measures texture by obtaining mean profile depth (MPD) readings for a 2-D profile of the surface in the direction of travel. These MPD values must be transformed into estimated texture depth (ETD) so that they can be compared to mean texture depth (MTD) measurements from the sand patch method
The majority of the analyses discussed in this paper was done with the assumption that the sand patch test measurement (MTD) was the most accurate predictor of surface macrotexture
Summary
Macrotexture is a measurement that can be used to quantify texture, roughness and friction characteristics of the roads and other surfaces. SMA samples have a relatively rough surface texture but less than that of the coarse graded asphalt. This type of asphalt is commonly used as a surface course for high-volume interstate roads due to its smoothness, drainage, friction, rut resistance and noise control characteristics. Minimal voids between aggregate and binder appear to exist and though it has a relatively coarse surface texture It has the smoothest surface of the three asphalt samples used in this research. A retarder was sprayed onto the surface of the Exposed Aggregate sample and the top mortar was later removed leaving the top layer or aggregate exposed Advantages of this finish type of pavement surface include low noise, exceptional high-speed skid resistance, low splash and spray, and good surface durability.
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