Reactivity assessment of aggregates : the role of chert crystallinity

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Show simple item record McNally, Ciaran Richardson, Mark G. 2010-10-11T13:45:32Z 2010-10-11T13:45:32Z 2005, American Concrete Institute en 2005-05
dc.identifier.citation ACI Materials Journal en
dc.description.abstract A systematic assessment scheme for determining the alkali reactivity of aggregates has been developed for international use. Expansion tests were conducted on Irish aggregates. Aggregates were subjected to a sequence of tests for alkali reactivity: petrographic examination and mortar bar and concrete prism expansion testing. No cases of damaging alkali-silica reaction have been identified to date in Ireland despite the presence of chert in significant commercial sources. Chert-bearing Irish aggregates performed poorly in expansion tests despite an exemplary service record. Chert crystallinity was examined through domain size and quartz crystallinity index. The crystallinity study helped explain the apparently anomalous behavior of the aggregates in tests. A preliminary study of the effect of alkali loading provided confirming evidence. It is suggested that enhanced crystallinity raises the alkali threshold value for reaction to one intermediate between that experienced in practice and in tests. en
dc.description.sponsorship Other funder en
dc.format.extent 389988 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.requires Critical Infrastructure Group Research Collection en
dc.subject Alkali-aggregate reaction en
dc.subject Chert en
dc.subject Expansion en
dc.subject.lcsh Alkali-aggregate reactions en
dc.subject.lcsh Chert en
dc.subject.lcsh Aggregates (Building materials)--Expansion and contraction en
dc.subject.lcsh Aggregates (Building materials)--Testing en
dc.title Reactivity assessment of aggregates : the role of chert crystallinity en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.status Peer reviewed en
dc.identifier.volume 102 en
dc.identifier.issue 3 en
dc.identifier.startpage 163 en
dc.identifier.endpage 169 en
dc.neeo.contributor McNally|Ciaran|aut| en
dc.neeo.contributor Richardson|Mark G.|aut| en
dc.description.othersponsorship Irish Cement en
dc.description.admin ke.kpw6/10/10 en

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