R.J. COLLINS* DJ. HARRIS** and W. SPARKES** * BRE **Kingsway Technology Ltd

Suspended floor systems constructed from inverted precast concrete T-beams with precast concrete block infill elements are a newly expanding market. Infill blocks offer a low risk route for the introduction of recycled aggregates. This paper details the results of a project in which blocks containing recycled aggregate were produced using conventional industrial plant and successfully tested in full scale floor tests.