Comparison of the morphology of alkali-silica gel formed in limestones in concrete affected by the so-called alkali-carbonate reaction (ACR) and alkali-silica reaction (ASR)

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DOIResolve DOI: http://doi.org/10.1016/j.cemconres.2013.01.013
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TypeArticle
Journal titleCement and Concrete Research
ISSN0008-8846
Volume47
Pages5154; # of pages: 4
SubjectAggregate particles; Alkali carbonate reaction; Alkali-silica reaction; Dolomitic limestone; Highway structures; Limestone particles; Scanning Electron Microscope; SEM-EDX; Calcite; Carbonation; Concretes; Morphology; Scanning electron microscopy; Silica gel; Stringers; Aggregates
AbstractThe morphology of alkali-silica gel formed in dolomitic limestone affected by the so-called alkali-carbonate reaction (ACR) is compared to that formed in a siliceous limestone affected by alkali-silica reaction (ASR). The particle of dolomitic limestone was extracted from the experimental sidewalk in Kingston, Ontario, Canada that was badly cracked due to ACR. The siliceous limestone particle was extracted from a core taken from a highway structure in Quebec, affected by ASR. Both cores exhibited marked reaction rims around limestone particles. The aggregate particles were polished and given a light gold coating in preparation for examination in a scanning electron microscope. The gel in the ACR aggregate formed stringers between the calcite crystals in the matrix of the rock, whereas gel in ASR concrete formed a thick layer on top of the calcite crystals, that are of the same size as in the ACR aggregate. © 2013 Elsevier Ltd.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Construction
Peer reviewedYes
NPARC number21271791
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Record identifier772f9ec6-7e1f-4b4d-9ae7-a44984a7f594
Record created2014-04-22
Record modified2017-04-05
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