Even after compaction, areas of handwork are often noticeable. Handwork behind the paver screed will generally deposit HMA material on top of the mat either in thin layers or individual aggregate particles. The following lists causes that are separate from mat tearing causes: Therefore, an investigation of mat tearing causes is also warranted. Many times, the same mechanisms can cause mat tearing and non-uniform texture. There are many potential causes for non-uniform mat texture. Furthermore, rough areas can be an indication of low density, aggregate segregation or temperature differentials, which can all substantially reduce pavement life. Rough surface areas are, however, undesirable in parking lots and other areas of high pedestrian traffic. In and of itself, a rough surface texture is not necessarily detrimental to pavement performance.
HMA mixtures with larger nominal maximum aggregate sizes will naturally appear more coarse on the mat surface than mixtures with smaller nominal maximum aggregate sizes.įigure 1: Open texture visible after rain.įigure 2: Open texture during construction.įigure 3: Excessive handwork leaving texture. Typically, mat areas that look rougher and more coarse than other areas are of the greatest concern. Extreme differences in mat surface appearance often take on the look of tearing or streaking and should be investigated as such. Differences in appearance within the mat surface.
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