The purpose of this is to develop an inventory and assessment for aggregates produced from both primary and recycled resources, making a comparison possible between processing options for unbound applications, aggregates for concrete and aggregates for asphalt.
It will assess igneous rocks, sedimentary rocks, sands and gravel deposits (land and marine), recycled unbound inert waste, recycled concrete and recycled asphalt.
The study will cover all aspects of extraction and processing of primary resources through to the point of their dispatch as aggregates.
It should also investigate issues such as the excess production of fines where sales and production are out of balance. Washing processes that enable the further processing of fines and other aggregate sizes are to be considered for both primary and recycled resources, in addition to conventional screening and crushing.
The report should also assess the relative proximity of sources of primary aggregates and recycled aggregates to the market place and disposal options for inert construction and demolition wastes.
This opportunity has arisen from the requirement for further data on the environmental profiles of various sources of aggregates and on the comparative environmental impacts of the different disposal and recovery routes.
The closing date for tender submissions is Monday 29 January 2007 and details are available from firstname.lastname@example.org.