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Volume stability of hydrated C3S systems in various salt solutions

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
SubjectConcrete
Abstract
The volume stability of well-hydrated C3S samples immersed in various salt solutions was investigated. Test variables included type of solution (sodium chloride, calcium chloride, magnesium chloride and magnesium sulfate) and salt concentration (from 0 to 180 g/I); All samples were prepared at a water/solid ratio of 0.5 and hydrated for several months in a lime-saturated solution. At the end of the curing period, one-mm thick samples were cut and immersed in salt solutions. The kinetics of degradation was assessed by thermal and X-ray diffraction analysis after 10, 20, 40 and 90 days of immersion. The volumetric stability was also followed by length change measurements. All samples were found to expand during immersion. In some cases, expansion was associated to the formation of new products. However, In most Instances, length changes appeared to be Induced by the progressive dissolution of the hydrated phases Initially present in the material. These results tend to support the hypothesis that dissolution mechanisms can initiate expansion.
Publication date
In
  • Concrete Science and Engineering 3, no. June (1 June 2001): 100–109.
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 45023
NRC-IRC-10393
NPARC number20386230
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Record identifier0a381d5b-bc04-4dfd-9e12-27d3952e2b5b
Record created2012-07-25
Record modified2020-03-27
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