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26May94 UK: WORLD MOVES TO RECYCLED AGGIES.

Construction worldwide is moving towards the exploitation of recycled aggregates, according to a study just completed by the Building Research Establishment.Environmental factors are the main reason for choosing to recycle these materials, says the BRE, which has published an information paper on the subject.The paper, by Rod Collins, section head at the BRE's Inorganic Materials Division, discusses the latest developments in the specification and use of recycled material.In many countries demolition rubble, instead of being crushed and re-used, is still disposed of in landfill sites.Elsewhere, notably in the Netherlands and Denmark, recycled aggregates are now widely used in concrete for major projects such as the construction of motorways and other large structures.'The UK construction industry is forecast to need between 6,500 million tonnes and 7,000 million tonnes of aggregates over the next 20 years,' said a BRE spokesman.'It is essential that the best and most efficient use is made of these resources.'In many cases, lower grade recycled aggregate could be used.'The BRE says that more than half of all the UK's demolition rubble is recycled at present, but that it is mainly used for fill and has little economic value.It adds that its guidance will help specifiers when new CEN standards for aggregates - in which recycled material will be included - are introduced. These are currently being developed. CONSTRUCTION NEWS