The benefits of using LWAC are mainly related to cost savings as a result of the reduction in dead weight. In particular, smaller foundations, less reinforcement, prestressing steel and formwork all contribute to greater economy without compromising structural capability or durability.This reporot gives an overview of the information currently available on LWAC and is comprehensively referenced to offer the reader more complex material. It is the third of a trilogy on specialised concretes, the others concentrating on the use of high-strength concrete and self-compacting concrete in bridge construction.