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Section 2.0 - Lignosulfonates
Figure 6. Adsorption-desorption isotherms of calcium lignosulfonate in completely
hydrated C S in an aqueous medium.
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2.5 Dicalcium Silicate-Lignosulfonate-Water System
Not much work has been reported on the influence of lignosul-
fonate on the hydration of dicalcium silicate. The rate of hydration of
dicalcium silicate is slow, and it is further retarded by the addition of
lignosulfonate. Evidence of this is the lower amounts of lime formed in
the hydrated product in the presence of 0.3% lignosulfonate. It has been
reported that sugar-free Na-lignosulfonate (0.3%) retards the hydration of
C S, but to a lower extent than the commercial lignosulfonate. [14]
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