The state-of-the-art report summarizes the results of an extensive search and review of available literature on the mechanical properties of concrete, with particular reference to the highway application of high performance concrete (HPC). The authors define high performance concrete in terms of minimum requirements for strength and durability, as well as potential to reduce construction time. The report discusses in detail the selection of materials and the manufacture of high performance concrete; the behavior of plastic and hardened concrete, including strength and deformation characteristics; the behavior of fiber-reinforced concrete; and the applications of high performance concretes.