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Suspended floor systems constructed from inverted precast concrete T-beams with precast concrete block infill elements are a relatively new and expanding market. Infill blocks make only a minor contribution to the high performance achieved with such floors, and thus offer a low-risk route for the introduction of recycled aggregates. This paper details the results of a project in whicvh blocks containing recycled aggregate were produced using conventional industrial plant and successfully tested in full-scale floor tests. it should be of interest to materials specifiers and the concrete/aggregate industry, particularly the precast and block industries and recyclers of construction and demolition materials.