Civil Engineering Reference
In-Depth Information
The relative effects of superplasticizers on the hydration of C
3
S has
been compared in the presence of 1% SMF, 1% SNF, and 0.25% LS
(lignosulfonate). The rate of hydration was determined by TG technique
(Fig. 7).
[18]
The amount of calcium hydroxide formed in pastes with these
admixtures was distinctly lower than those in reference samples, indicating
significant retardation effects. It was also found that the C-S-H formed in
the presence of the admixtures had a higher C/S ratio. It is evident from the
figure that the retardation effect of even 0.25% LS is significant.
Figure 7.
Effect of SMF, SNF, and LS on the amount of Ca(OH)
2
formed in the hydration
of C
3
S.
