Sugar-free lignosulfonate

Water Reducer Nil Na Gluconate Glucose Sugar-free Lignosulfonate... 

Conduction calorimetric analysis has also been carried out on the effect of sugar-free lignosulfonate on the hydration of cement. It was found that sugar-free lignosulfonate was nearly as efficient as commercial lignosulfonate in retarding rate of reaction and setting of cement. 

Ramachandran and LoweryP l applied conduction calorimetry to the study of the relative effects of various retarders on the hydration of cement. The retarders used were calcium gluconate, glucose, glycolic acid, molasses, sodium borate, sodium citrate, sodium heptonate, sodium hexametaphosphate, sodium pyrophosphate, sugar-free lignosulfonate, and sucrose. The dosage of the chemicals varied between 0.025 and 1.2%. 

Ramachandran, V. S., Effect of Sugar-Free Lignosulfonates on Cement Hydration, Zement-Kalk-Gips, 31 206-210 (1978)... 

Not much work has been reported on the influence of lignosulfonate 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 C2S, but to a lower extent than the commercial lignosulfonate. 

Figure 10. DTG curves for anhydrous and hydrated CjS with or without 0.3% sugar-free sodium lignosulfonate.

Figure 11. DTA of C3A hydrated in the presence of sugar-free Na lignosulfonate.

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