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Study OKs recycling for precast


HALF the virgin aggregate used in precast concrete and masonry blocks can be replaced by recycled aggregate without affecting performance, a new study has claimed.

A report on the use of construction and demolition waste in precast concrete and other building products at the University of Liverpool revealed that as much as 50 per cent of virgin aggregate could be replaced by recycled material.

Replacement of material at this level showed no detrimental affect on the mechanical properties of the finished product, according to the research.

The two-year study focused on the performance of blocks containing both concrete and masonry-derived aggregate and blocks where cement had been partially replaced by pulverised fuel ash and slag.