Do recycled and secondary aggregates leach?

A literature review for the Waste and Resources Action Programme (WRAP) indicated that the perceived risk of leaching from recycled and secondary aggregates (RSA) is often overstated, particularly in concrete and hydraulically bound materials (HBM). The production of concrete and HBM involves coating aggregate particles with cementitious binders, reducing the surface area of aggregate exposed to water and the amount able to leach. The leaching potential from concrete and HBM at ground level and below is considered. There are negligible risks of leaching from above-ground concrete containing RSA. WRAP has published a quality control protocol for producing aggregates from inert waste e.g. bricks, masonry, concrete and asphalt. The leaching potentials of aggregates produced from blast furnace and steel slags, pulverised fly ash, incinerator bottom ash, colliery spoil or spent oil shale, china clay sand and slate aggregate are considered. The assessment of leaching from recycled and secondary aggregates in HBM or concrete is commonly conducted using a monolithic leaching test such as the Dutch Standard NEN 7345.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/14605856
• Authors:
  • HOOPER, R
• Publication Date: 2005

Language

• English

Media Info

• Pagination: 41-3
• Serial:
  • CONCRETE ENGINEERING INTERNATIONAL
  • Volume: 9
  • Issue Number: 1
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 1460-5856

Subject/Index Terms

• TRT Terms: Aggregates; Binders; Concrete; Fly ash; Hydraulic properties; Leaching; Recycling; Sand; Slag; Test procedures; Waste products (Cargo)
• Geographic Terms: United Kingdom
• ITRD Terms: 4577: Aggregate; 4948: Binder; 4563: By product; 4755: Concrete; 4580: Fly ash; 4748: Hydraulic properties; 4553: Incinerator ash; 5276: Leaching; 4573: Recycling (mater); 4105: Sand; 4561: Slag; 6288: Test method; 8119: United Kingdom
• Subject Areas: Energy; Environment; Geotechnology; I15: Environment; I36: Aggregates;

Filing Info

• Accession Number: 01030216
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Aug 7 2006 1:25PM