EVA025 –Final Report: Aggregates Industry Life Cycle Assessment Model: Modelling Tools and Case Studies Life Cycle Assessment of Aggregates Report Prepared by Dr Anna Korre & Professor Sevket Durucan – Imperial College London Project code: EVA 025 ISBN: NB Research start date: March 2007 Report Date: August 2009 Front cover photograph: Marine Dredged Aggregate Stockpile _ MIRO Photo Library Published by Waste & Resources The Old Academy Tel: 01295 819 900 Helpline freephone Action Programme 21 Horse Fair Fax: 01295 819 911 0808 100 2040 Banbury, Oxon E-mail:
[email protected] OX16 0AH Executive summary The objective of the work reported here was to develop a Life Cycle Inventory (LCI) and Assessment (LCA) Model for the aggregates industries. The work includes the extraction and processing of primary resources through to the point of their dispatch as aggregates (including overburden stripping, drilling and blasting, and restoration), and comparing with the processing of equivalent recycled aggregates for three grades (aggregates for unbound applications; aggregates for concrete; aggregates for asphalt) from: igneous rocks; sedimentary rocks; sand and gravel deposits (land and marine); recycled unbound inert waste; recycled concrete; and recycled asphalt in particular to ascertain and quantify all the environmental impacts of each phase in the product life cycle. As well as conventional crushing and screening, the aggregates processing component of the work also includes the Life Cycle impacts of excess production of fines, washing of recycled aggregates to enable further processing of fines and other aggregate sizes and the disposal options for inert construction and demolition wastes. The model includes impacts related to transport of primary and recycled aggregates from source to the market place, introducing a spatial dimension to the LCA process within the UK.