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The re-utilisation of discarded building materials in cement-stabilised layers of road and airfield pavements

Authors
  • Pasetto, M.
Type
Book
Journal
Waste Management
Publication Date
Jan 01, 2000
Volume
1
Pages
548–566
Identifiers
DOI: 10.1016/S0713-2743(00)80066-5
ISBN: 978-0-08-043790-3
Source
Elsevier
License
Unknown

Abstract

Re-utilisation of marginal materials is standard practice in road and airfield pavement construction. However, not all marginal materials have sufficiently well known performance properties or, if they are known, are suitable for a generalised use.For instance, Construction and Demolition (C&D) wastes are materials that can be used, in accordance with some specific rules, in the construction of road and airfield pavements. A study carried out by the University of Padua (Italy) has proved that these materials can be reutilised in rigid pavements and has demonstrated the most useful options and criteria for optimising the results (Pasetto, Leeds, 1999).Further research has confirmed the possibility of using C&D materials, as they are, as well as in cement bound or hydraulic-binder stabilised mixtures, in subgrades, sub-bases and road bases of flexible pavements.Chemical, by means of leaching tests, and physical-mechanical characterisations by standard laboratory tests (compaction, CBR, freeze-thaw cycles; compression, tensile strength, secant and tangent elastic modulus, dynamic modulus using ultra-sound devices on different aged mixtures) have been done on discarded building materials of different origin and grading. It has been ascertained that if the recycled aggregate seems to be inferior to the natural one, if it is used in cement bound mixtures, it becomes equivalent to the tradiational material or even preferable because it is cheaper and harmless to the environment.

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