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NRRA States have been diamond grinding concrete pavements for many years traditionally as a preservation treatment to improve smoothness and/or enhance friction and in new construction to meet contract requirements and avoid penalties. More recently diamond grinding has used for noise reduction. NRRA States that use diamond grinding have conducted research that can add to the collective knowledge base of this process and performance. This project explores the state of practice of diamond grinding PCC surfaces and the benefits.

Due to increased traffic congestion and reduced budgets, National Road Research Alliance (NRRA) states are seeking effective rehabilitation techniques for older concrete pavements. Unbonded concrete overlays have a successful history as a rehabilitation option, and there is interest by NRRA member states to assemble information on best practices for the design, construction, and maintenance that relate to field performance. The goal of this project is to produce a brief technical document synthesizing the design, construction, maintenance, best practices, and performance observations of unbonded concrete overlays in NRRA member states.