This ACI Special Publication (ACI SP-253) contains 25 papers from the Fifth ACI/CANMET/IBRACON International Conference on High-Performance Concrete Structures and Materials that was held in Manaus, Amazon State (AM), Brazil, June 18-20, 2008. Topics include Durability, Self-Compactability, Curing, Retarders, and Abrasion Resistance. The Fifth Conference is a result of the collaboration of ACI and CANMET along with São Paulo University, Federal University of Goiás, Amazon State University, and Brazilian Concrete Institute (IBRACON).