An investigation into premium and marginal pavement aggregates from New Zealand

ResearchSpace/Manakin Repository

Show simple item record Li, W en Wilson, Douglas en Larkin, Thomas en Black, Philippa en 2018-10-09T03:47:23Z en 2018-11 en
dc.identifier.issn 1470-9236 en
dc.identifier.uri en
dc.description.abstract Aggregates used in pavement construction in New Zealand are classified as either premium or marginal depending on their quality. Using marginal materials in a pavement may cause significant problems, such as fatigue cracking, rutting and swelling. One likely reason for these problems can be the mineralogical composition of the aggregates, particularly if they contain swelling minerals. The present paper investigates how swelling minerals can affect the properties of New Zealand aggregates. Standard engineering tests were conducted on five New Zealand materials, two of which are regarded as meeting the local NZTA (New Zealand Transport Agency) M4 premium specification and three regarded as marginal. The geological properties and mineralogical compositions of all aggregates were also determined by petrographic examination and X-ray powder diffraction analysis (XRD), and the swelling potential identified using a one-dimensional swelling test. It was found that clay minerals generally exist in all five aggregates and swelling minerals in the three marginal aggregates and a premium aggregate; the last mentioned also proved to have a high swelling potential. It is concluded that the test methods specified by the NZ standard and currently used to distinguish between and categorize premium and marginal aggregates appear insufficient when they arewater saturated. Additional test methods (XRD and a swelling test) are suggested to complement the standard test methods. en
dc.publisher Geological Society en
dc.relation.ispartofseries Quarterly Journal of Engineering Geology and Hydrogeology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title An investigation into premium and marginal pavement aggregates from New Zealand en
dc.type Journal Article en
dc.identifier.doi 10.1144/qjegh2016-132 en
pubs.issue 4 en
pubs.begin-page 438 en
pubs.volume 50 en
dc.rights.holder Copyright: The author en
pubs.end-page 443 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 710962 en Engineering en Civil and Environmental Eng en
dc.identifier.eissn 2041-4803 en
pubs.record-created-at-source-date 2017-11-10 en

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