Extraction of CaOH2 from portland cement and 3CaOSiO2 pastes

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TypeArticle
Journal titleJournal of Chemical Technology and Biotechnology
ISSN0142-0356
Volume32
Pages946952; # of pages: 7
Subjectcement; calcium; hydroxides; extraction (chemistry); lime extraction; tricalcium silicate pastes; Concrete; ciment; calcium; oxyde basique; extraction (chimie)
AbstractA procedure for extracting free lime from mature pastes of Portland cement and tricalcium silicate is described. It involves exposure of thin discs of paste to an aqueous solution of Ca(OH)[2] in such a way that the concentration of the solution remains in the range 9.5-12 mmol CaO dm[-3] throughout the extraction period. Calcium hydroxide remaining in the solid is estimated by differential scanning calorimetry and that in the extractant is estimated by atomic absorption spectrophotometry. Investigations of the extracted samples by scanning electron microscope, helium pycnometry, X-ray diffraction, mercury porosimetry and thermogravimetry indicate that the extraction procedure has no significant influence on the C-S-H phase.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1095
NRC number21200
3683
NPARC number20375683
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Record identifier9273fe5c-80b3-4be1-8e99-ce3985466beb
Record created2012-07-23
Record modified2016-05-09
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