| This study compares two methods for measuring pavement macrotexture and investigates the influence of paved road macrotexture on paved road PM 10 emissions originating both from soil erosion and deposition, and from tire, brake and asphalt wear. Macrotexture was measured using the ASTM Sand patch method and the Digital Surface Roughness Meter (DSRM). PM 10 emissions were estimated using AP-42 sampling and measured with a Mini-PI-SWERL(TM).;DSRM and sand patch mean texture depths (MTDs) were well-correlated. Silt-normalized ambient PM10 emissions variations were partially explained by pavement macrotexture. PM10 emissions experiments using controlled silt loadings showed good correlations with pavement macrotexture. A change in the slope of emitted PM10 mass vs pavement macrotexture occurred between 0.8 and 0.9 mm MTD.;PM10 emissions linearly declined with increasing pavement aggregate mode size. Wind erosion theory showed that PM10 emissions were related to wind stress at a height of 0.075 mm, threshold friction velocity estimated from soil size distribution mode, and aerodynamic roughness height determined from adjusted pavement aggregate mode size. |
