University of California Pavement Research Center

The goal of this report is to conclude the project titled “Quieter Pavement Long-term Monitoring” by completing the measuring of noise and smoothness on previously built jointed plain concrete pavements (JPCP), surfaced with conventional diamond grinding (CDG) or the new grind and groove (GnG), and on continuously reinforced concrete pavement (CRCP). Previous studies have initiated the investigation into both the noise properties of GnG and CRCP. This project gathered data in 2018 and again in 2020 on the performance of these concrete pavements in terms of noise and smoothness. These data were added to the noise database to further the development of specifications, guidelines, and standardized field test methods toward quieter pavements. The GnG technology on test sections in Caltrans pilot projects was evaluated in terms of measured tire/pavement noise, smoothness, friction, and surface drainability. The results of this study are to be used to further incorporate quieter pavement research into standard Caltrans practice and may serve as a basis for changes in quieter pavement policy and specifications. This report presents the results of four rounds of testing, two rounds completed in 2018 and 2020 on sections first tested in 2012 and 2013 and again in 2016 and 2017. Recommendations include continued monitoring of GnG, considering use of GnG on CRCP, and continued use of diamond grinding. These recommendations are based on functional performance and do not consider cost-effectiveness compared with other potential strategies.