Ethylene Glycol Accelerated Weathering Test: An Improved, Objective Aggregate Durability Test Method

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dc.contributor.author van Blerk, PGL en
dc.contributor.author Fletcher, E en
dc.contributor.author Costello, Seosamh en
dc.contributor.author Henning, Theunis en
dc.date.accessioned 2017-06-29T03:03:05Z en
dc.date.issued 2017 en
dc.identifier.citation Transportation Research Record 2655:27-35 2017 en
dc.identifier.issn 0361-1981 en
dc.identifier.uri http://hdl.handle.net/2292/33860 en
dc.description.abstract Ethylene glycol has been used extensively by the concrete and road construction industries to identify rock durability issues associated with smectite clay minerals. The presence of these clay minerals is synonymous with rock degradation under normal environmental wetting and drying cycles. However, such historical test methods are predominately based on a subjective visual interpretation, describing the observed degradation of individual rock pieces at fixed time intervals during the soaking process. In addition, some test methods include complex equations with multiple weighting factors applied to nominated degradation descriptors (e.g., spalling, fracture, and disintegration) used to calculate a single durability indicator. This paper describes the development and implementation of an alternative, nonsubjective accelerated weathering test that also uses ethylene glycol. The research included metamorphic and volcanic rock types used extensively in New Zealand for road construction. The greatest benefit of the proposed new test method is the ability to eliminate the subjective visual assessment described in historical test methods and adequately quantify results to specify contractual acceptance and rejection criteria. The test method also shows that good repeatability is possible from duplicate test samples. However, rock quality and quarry production consistency will influence the ability of the test method to report the same “percentage change in fines” over a prolonged test period. This phenomenon was particularly evident with problematic and lower quality rock. The test findings are well supported by observed field performance, thus giving confidence in the new method’s usefulness. en
dc.publisher US National Research Council en
dc.relation.ispartofseries Transportation Research Record 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. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0361-1981/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Ethylene Glycol Accelerated Weathering Test: An Improved, Objective Aggregate Durability Test Method en
dc.type Journal Article en
dc.identifier.doi 10.3141/2655-05 en
pubs.begin-page 27 en
pubs.volume 2655 en
dc.description.version Pre-print en
dc.rights.holder Copyright: National Academy of Sciences en
pubs.end-page 35 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article en
pubs.elements-id 618641 en
pubs.org-id Engineering en
pubs.org-id Civil and Environmental Eng en
pubs.record-created-at-source-date 2017-06-29 en


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