Better Roads

July 2014

Better Roads Digital Magazine

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Better Roads July 2014 7 mounted on a cross member which attaches to the front bumper, positioned 12 inches above the pavement, and simultaneously the RoLine footprints were positioned 72 inches apart (center-to-center). At the same time that profi le measurements were ob- tained, still photos were taken at approximate 150-foot intervals, allowing correlation between the profi le results and a roadway image. The image was captured using a camera mounted to the windshield just below the rear view mirror. Both the images and profi le data were linked to GPS coordinates. The research found that the diamond-ground surface had an overall average profi le index (zero blanking band) of 20 inch/mile with a standard deviation of 3.9 inch/mile, while the SMA exhibited an overall average of 23.1 inch/mile and a standard deviation of 6.3 inch/mile. While 90 percent of the diamond-ground surface exhibited a profi le index of 25 inch/mile or less, only 61 percent of the SMA surface achieved this. Additionally, while 100 percent of the diamond-ground surface can meet a requirement of 30 inch/mile, 10 percent of the SMA surface still would exceed this limit. The results indicate that the diamond-ground surface was smoother than the SMA overlay by approximately 3 in./ mile, and that the smoothness variability was approximately half that of the SMA surface. (For "Profi lometer Testing on Chicago's I-290: Stone matrix asphalt overlay vs. conventional diamond grinding," that ran in Better Roads, go to profi lometer-testing-on-chicagos-i-290-stone-matrix-asphalt-overlay-vs- conventional-diamond-grinding.) a result of tests at the MnROAD fa- cility. Working through a pooled fund study, several diamond grinding confi gurations fi rst developed at Purdue University were fi eld-tested on the low-volume road in 2007. MnROAD staff since has been monitoring them to determine their long term performance with regards to noise, texture and friction. The successful performance of these textures at MnROAD has led to their implementation in several projects in Minnesota and other states. What is Next Generation Concrete Surface? The NGCS is an innovative grooving/grinding technique that NEAR YOU! COMING TO A LOCATION Technology is constantly changing. Understanding how these changes impact your business and boost profitability is now more important than ever. With our "we'll bring it to you" concept, the Topcon Technology Roadshow makes it convenient for anyone to learn how these industry innovations can help your business increase productivity in an ever-changing environment. REGISTER TODAY AT TOPCONROADSHOW.COM LEARN MORE ABOUT 7H[W,1)2WRRUYLVLWZZZEHWWHUURDGVFRPLQIR

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