Language selection

Government of Canada / Gouvernement du Canada

Search

The effect of nitrobenzoic and aminobenzoic acids on the hydration of tricalcium silicate: a conduction calorimetric study

From National Research Council Canada

AuthorSearch for: 1; Search for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
SubjectConcrete
Abstract
The hydration of tricalcium silicate (C3S) in the presence of 0.004, 0.008 and 0.016 mol.% (with respect to 100 g of the silicate) of benzoic acid, o-, m- and p-nitrobenzoic and aminobenzoic acids, was followed by conduction calorimetry. Benzoic acid at 0.004 and 0.008 moles behaved as a delayed accelerator of hydration, whereas at a dosage of 0.016 moles it performed as an accelerator by decreasing the onset of the induction period and promoting the earlier appearance of the main exothermic peak. The m- and p-nitrobenzoic acids accelerated the hydration of C3S, whereas o-nitrobenzoic acid acted as a retarder. Both m- and p-aminobenzoic acids retarded the hydration by delaying the appearance of the main exothermal peak. o-Aminobenzoic acid showed a similar effect to that of the reference at early times by not affecting the induction period and the maximum rate-of-heat peak. However, it increased slightly the amplitude of the main exothermic peak. The compounds that promoted the appearance of a heat peak at periods of 1 h or earlier exhibited an acceleration effect. In the presence of retarders this peak did not appear.
Publication date
In
  • Thermochimica acta 190 (1991): 325–333.
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-1708
NRC numberNRCC 33094
NRC-IRC-3145
NPARC number20330391
Export citationExport as RIS
Report a correctionReport a correction (opens in a new tab)
Record identifier923c9848-d1e3-49ac-aa5d-ac4d50265fe2
Record created2012-07-18
Record modified2020-03-17
Date modified: