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Effect of phosphonate-based compound on the hydration of cement and cement components

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.14359/4105
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
ConferenceFourth International Conference on Superplasticizers and Other Chemical Admixtures in Concrete: 11 October 1994, Montreal, Que., Canada
Subjectcalcium aluminates; calcium silicates; calorimeters; cements; gypsum; hydration; portland cements; materials research; Cement and Concrete; Admixtures; ciments
Abstract
The influence of a phosphonate-based admixture called aminotri (methylene phosphonic acid), abbreviated to ATMP, on the hydration of C₃A, C₃A and 255 gypsum C₃S and Type I cements (normal, high alkali and low alkali types) was evaluate. Isothermal conduction calorimetric investigations of various mixtures containing 0.03-0.05% of phosphonic acid, at a water : cement ratio of 0.35 and 1.0, were carried out up to 72 hrs. The ATMP acted as a super-retarder for all the mixtures studies. At a dosage of only 0.05%, the exothermal effect for one of the high alkali Type I cements was delayed by about 16 hrs. The hydration of C₃A and C₃S was also retarded by about 40-50 mins and > 50 hrs respectively at a dosage of 0.05%. In the C₃A and gypsum system the third peak corresponding to the reaction of C₃A with ettringite was extended by about 8-9 hrs.
Publication date
PublisherAmerican Concrete Institute
In
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-3585
NRC numberNRCC 37039
NRC-IRC-5081
NPARC number20330047
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Record identifier119b2fe4-c4a4-4d5c-9187-f8ac8ad98176
Record created2012-07-18
Record modified2024-05-17
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