Recycled-Glass Blends in Pavement Base/Subbase Applications: Laboratory and Field Evaluation
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 7
Abstract
This paper presents the findings of a field and laboratory evaluation on the use of recycled glass blends as unbound pavement base/subbase materials. The parent recycled aggregates studied in this research were fine recycled glass (FRG), recycled concrete aggregate (RCA), and waste rock (WR). The geotechnical performance of the recycled aggregate blends of particular interest in this research were FRG blended with RCA (FRG/RCA) and FRG blended with WR (FRG/WR) in pavement base applications. The geotechnical performance of a trial road pavement was assessed by means of initial laboratory tests and subsequently field tests. The initial laboratory experimental program included specialized geotechnical tests including repeated load triaxial and triaxial tests to characterize the recycled materials. The subsequent trial road pavement constructed comprised seven different sections of FRG blends in the pavement base varying from 10 to 30% recycled glass content as well as two control sections with RCA and WR. Field tests were undertaken with nuclear density gauges (NDG) and Clegg impact hammers (CH) to assess the performance of the various trial pavement sections. The recycled glass blend with 20% glass content was found to be the optimum level, where the blended material was workable and also had sufficiently high strength. The field testing results indicated that FRG blends are suitable in pavement subbase applications and is a viable additive when used in limited proportions with other recycled aggregates in pavement subbases. FRG blends may, however, not fully meet specified requirements as a pavement base material.
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Acknowledgments
The authors wish to thank Sustainability Victoria, Alex Fraser Group, Packaging Stewardship Forum of the Australian Food and Grocery Council, and the National Packaging Covenant for funding this research project. The authors wish to thank VicRoads for their support and technical advice throughout this research project and ARRB Group for undertaking the field tests and repeated load triaxial tests for this project. The views expressed in this paper are those of the authors and do not necessarily represent those of other parties. The fifth author are grateful to the Thailand Research Fund under the TRF Senior Research Scholar program Grant No. RTA5680002.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 7 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 9, 2013
Accepted: Oct 23, 2013
Published online: Oct 25, 2013
Published in print: Jul 1, 2014
Discussion open until: Sep 7, 2014
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