Language selection

Government of Canada / Gouvernement du Canada

Search

Effect of sugar-free lignosulphonates on cement hydration

From National Research Council Canada

Download
  1. (PDF, 1.2 MiB)
AuthorSearch for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Article
SubjectConcrete; hydrated cement; concrete admixtures
Abstract
Tricalcium aluminate, tricalcium silicate and Portland cement were hydrated at a water:solid ratio of 0.425 to 0.6 for periods ranging from fifteen minutes to sixty days in the presence of commercial calcium lignosulphonate in the range 0-3%, sugar-free sodium lignosulphonate and sugar-free calcium lignosulphonate. The analysis of the hydration characteristics was followed by a differential thermal analysis, a thermogravimetric analysis, X-ray diffraction and conduction calorimetry. All the lignosulphonates retarded the hydration of C3A and C3S; the efficiency of the retardation increased as the amount of admixture was increased. With respect to the hydration of Portland cement, the retardation occurred in the alite phase. It was observed, however, that the commercial lignosulphonate (0.3- 0.5%) accelerated the primary reactions of the C3A phase. A considerable reduction in the quantity of water required for normal consistency for all admixtures was observed. In small amounts, the three admixtures retarded the initial and final setting characteristics of the mortar, but at higher concentrations, the commercial lignosulphonate caused quick setting.
Publication date
In
  • Zement-Kalk-Gips 31, no. 4 (April 1978): 206–210.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-847
NRC numberNRCC 17554
NRC-IRC-3020
NPARC number20375641
Export citationExport as RIS
Report a correctionReport a correction (opens in a new tab)
Record identifierad21040d-776e-4c07-8287-d77257b7e030
Record created2012-07-23
Record modified2024-03-14
Date modified: