Effect of sugar-free lignosulphonates on cement hydration

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Journal titleZement-Kalk-Gips
Pages206210; # of pages: 5
Subjecthydrated cement; concrete admixtures; Concrete
AbstractTricalcium 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
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number17554
NPARC number20375641
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Record identifierad21040d-776e-4c07-8287-d77257b7e030
Record created2012-07-23
Record modified2016-05-09
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