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ii The use of recycled aggregate in concrete opens possibilities in the ways in which recycled materials can be used for structural applications; indeed, it may be an important breakthrough towards sustainable development. The utilisation of recycled aggregate is an effective solution to the problem of possessing excess waste materials while simoultaneously maintaining satisfactory concrete quality. The utilisation of waste construction materials should be related to the application of quality guarantee systems to achieve suitable product properties. A complete understanding of the characteristics of new materials is, therefore, extremely important so that its potential in applications can be thoroughly studied. Recycled aggregate has been employed for a long time, and is in limited use for roadwork, earth work and non-structural applications. The use of recycled aggregate in concrete construction or structural applications is scarcely reported. However, in some countries recycled aggregate is used in new concrete for construction projects through the carefu