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BRE leads waste as aggregate research


RESEARCH company BRE is heading up a project to demonstrate the suitability of industry waste as alternative aggregates.

The two-year project will concentrate on the use of nonferrous industry wastes such as Imperial Smelting Furnace (ISF) slag and Spent Pot Linings (SPL) as aggregates in concrete and bitumen production.

ISF slag is a by-product of zinc production with a typical particle size of 3 mm or less.

SPL aggregate is the brick lining layer from aluminium smelting furnaces.

Andrew Dunster, BRE principle consultant at the centre for concrete construction, said previous studies have shown the use of ISF aggregate is feasible but is yet to be carried out in practice.

'The use of ISF slag has been looked at in the past but costs were high, ' he said.

'One issue with ISF aggregate is that small amounts of lead and zinc can affect the set of concrete and bitumen.'