The Effects of lithium hydroxide solution on alkali silica reaction gels created with opal

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DOIResolve DOI: http://doi.org/10.1016/j.cemconres.2003.10.011
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TypeArticle
Journal titleCement and Concrete Research
Volume34
IssueApril 4
Pages641649; # of pages: 9
Subjectalkali aggregate reaction, lithium compounds, opal; Concrete
AbstractThe reaction of Nevada opal with calcium hydroxide, potassium and lithium hydroxide solutionswas investigated. In addition opal was exposed to a combined solution of these three hydroxides.The progress of the three reactions was followed using X-ray Diffraction (XRD), 29Si NuclearMagnetic Resonance (NMR) and Scanning Electron Microscopy (SEM). The XRD resultsindicated the presence of a low angle peak exclusive to the lithium-based reactions. The NMRresults suggested a change in the silicate structure in the presence of lithium. These techniquesindicated that the reaction of the alkali with the opal starting material is inhibited, and perhapsstopped in the presence of lithium hydroxides. SEM revealed that the morphology of thereaction products on the surface of the reacted opal grains is markedly different in all cases. Itwas concluded that evidence to support the theory of a protective layer exists and that the natureof the layer varies with ion type.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45385
14438
NPARC number20378432
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Record identifierd1ab2556-665c-46fc-b916-cd2f90729303
Record created2012-07-24
Record modified2016-05-09
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