Civil Engineering Association

Use of Recycled Aggregates in Construction

There is increasing demand and interest in aggregates from non-traditional sources such as from industrial by-products and recycled construction and demolition (C&D) wastes. The American Concrete Institute (ACI) focuses on the removal and reuse of hardened concrete whereas the Department of the Environment and Water Resources in Australia and CSIRO have developed a guide on the use of recycled concrete and masonry materials.
The Waste & Resources Action Programme (WRAP) in the UK classified aggregates from primary, recycled and secondary material resources. Recycled aggregates encompass industrial by-products and reused construction products, all of which were once considered wastes and dumped in landfill. The recently introduced European Standards for aggregates do not discriminate between different sources, and are for ‘aggregates from natural, recycled and manufactured materials’. The focus is on fitness for purpose rather than origin of the resource.
The purpose of this report is to review the various sources of aggregate and examine their potential use in concrete and/or road construction materials.
For the purpose of this report, the following classifications are adopted.
- Natural aggregate - Construction aggregates produced from natural sources such as gravel and sand, and extractive products such as crushed rock.
- Manufactured aggregate - Aggregates manufactured from selected naturally occurring materials, by-products of industrial processes or a combination of these.
- Recycled aggregate - Aggregates derived from the processing of materials previously used in a product and/or in construction.
- Reused by-product - Aggregates produced from by-products of industrial processes.

Uploaded: Dec/16/2010, File Size: 183.57 KB, RAR'd single PDF (paginated, bookmarked, searchable text)

If you like this publication, CivilEA's team strongly suggest you to buy it! Support the authors!