4.1.2. Viscosity
Except for time dependence, rheology of cement paste is
normally described with Bingham model involving yield
stress and viscosity. The result of the yield stress and viscosity
against flow value of cement paste is shown in
Fig. 3. As expected, yield stress and plastic viscosity
increase with a reduction in the flow of paste. An incorporation
of 0.25% WR only slightly increases these values.
Incorporation of SP significantly increases both yield stress
and plastic viscosity. The increase is more with an increase
in SP dosage. The SP dosage of 1.0% by weight of cement
gives the best result with paste of highest yield stress and
plastic viscosity