In the last 12 years, the American Concrete Institute (ACI) and the Canada Center for Mineral and Energy Technology (CANMET), in association with several Brazilian institutions, have made a diligent effort to disseminate high-performance concrete technology in Brazil and in the Latin American countries. The present ACI Special Publication (ACI SP-253) contains the 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. This Conference received 146 abstracts from 19 countries.