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Use of crushed waste aggregates for DBM road bases

Authors
  • Montepara, Antonio
  • Tebaldi, Gabriele
Type
Book
Journal
Waste Management
Publication Date
Jan 01, 2000
Volume
1
Pages
996–1007
Identifiers
DOI: 10.1016/S0713-2743(00)80107-5
ISBN: 978-0-08-043790-3
Source
Elsevier
License
Unknown

Abstract

The increasing difficulties encountered in retrieving aggregates have stressed the need to find resources which might be alternative to the natural ones. At the same time, the significant increase of debris volume produced by the demolition of civil works has caused great problems in waste storage. A possible recycling use of demolition waste material is its transformation into aggregates to be employed in casting of mixtures. Some recycling experiences have explored the possible use, in concrete casting, of aggregates obtained through the crushing of demolitions. The present work studies the problem of the use of recycled aggregates in casting of bituminous mixtures.The research has undertaken the characterisation of recycled aggregates in order to verify the limitations of the technical codes in terms of physical and mechanical requirements. Successively, a study to evaluate the affinity of the bitumen and the workability of the mixture, used as a base layer and prepared with recycled aggregates, has been undertaken. The study has been performed by means of the gyroscopic press in order to determine the volumetric characteristics in accordance to SHRP (Strategic Higway Research Program) guidelines. For the best mixture obtained, a performance characterisation has been executed by determining the value of complex modulus as a function of temperature and frequency. The experimental tests have allowed a comparison of the performances between bituminous mixtures prepared with recycled aggregates and those prepared with natural aggregates.

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