This guide provides information for investigating, selecting, and using materials in the production of low-density concrete for civil works concrete structures. As there are many similarities between normal-density concrete and low-density concrete, the elements discussed focus only on those areas in which there are differences between the two - in material types, materials processing, mixture proportioning, batching, placing, consolidation, job controls, and other construction-related issues. Emphasis is placed on use of low-density concrete in hydraulic structures. Information on plans and specifications, coordination between design and field activities, preparation for construction, concrete quality verification and testing, and reporting are similar for both normal- and low-density concrete and are described in Engineer Manual 1110-2-2000, Standard practice for concrete for civil works structures.