In a groundbreaking decade-long research project, the International Grooving & Grinding Association (IGGA) has demonstrated the remarkable longevity and effectiveness of diamond-ground on pavements. This research, conducted in three states, Illinois, North Carolina, and Oklahoma, aimed to evaluate the impact of blade spacing on texture durability, friction, smoothness, and tire/pavement noise reduction.
Diamond grinding is a well-known technique for restoring pavement rideability, improving macrotexture, enhancing skid resistance, and reducing hydroplaning risks. Unlike diamond-impregnated carbide bits, which can cause microcracking, diamond grinding uses abrasion to gently remove the surface layer of hardened concrete. After grinding, the pavement texture consists of grooves and lands, providing drainage for safer wet-weather conditions.
The IGGA conducted tests over the course of a decade, starting in 2012, on various pavement types, including new construction and concrete pavement preservation. Three different spacer arrangements (0.110”, 0.120”, and 0.130” wide) were tested. In 2021 and 2022, tests confirmed that all pavements, regardless of spacer width, were performing well, maintaining texture and friction characteristics after nearly a decade in service.
Key Findings in Each State
Illinois: Test sections on Bartlett Road showed no significant impact on textures after three years in service, and in 2021, all textures were still functioning as intended.
North Carolina: Test pavements on NC 540 demonstrated satisfactory friction levels after three years of light traffic. Additional texture measurements in 2021 showed consistent results across spacer widths.
Oklahoma: The research on U.S. Route 69 revealed that wider spacers produced better pavement textures, especially at higher speeds. Texture measurements in 2022 showed comparable results across spacer widths after nearly a decade in service.
Lessons Learned and Implications
The study also highlighted the need for comparing high-speed and static measuring devices to ensure accurate texture depth measurements. Visual assessments suggested slight discrepancies between the two measurement methods, emphasizing the importance of further research in this area.
Read more here: https://www.acpa.org/industry-news/igga-highlights-longevity-in-research-report/