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2015) 3 (Ranjbar and Mousavi 4.75, 9.5 2015) Chemical admixtures References SP HRWRA (Bagon and Frondistou- Pozzolith 200-N Yannas 1976) (Bischoff, Yamura, Cormix SP5 and Perry 1990) (Ravindrarajah and N.G.
The addition of the first dosage of HRWRA to the control mix C10 resulted in a decrease in viscosity as measured by both the truck and the ICAR rheometer.
In the second series of mixtures, the addition of the first dosage of HRWRA resulted in a decrease in viscosity as recorded by both the truck and ICAR rheometer.
The addition of HRWRA for mix C11, C12, and C13 resulted in decreases in the yield values measured by both the ICAR rheometer and the truck.
A polycarboxylate-based HRWRA was used to achieve desired workability.
After thorough mixing, the HRWRA was added with the remaining 25% of the water.
Concrete Cement W/B 10 mm stone Sand type (kg/[m.sup.3]) (kg/[m.sup.3]) (kg/[m.sup.3]) SCC 450 0.4 834.0 926.6 Concrete Water HRWRA type (kg/[m.sup.3]) (L/[m.sup.3]) SCC 180 4.45 TABLE 2: Description of different curing techniques and the results of 28-day compressive strength and chloride permeability.
Figure 2 shows the results of 10 replicated mixes, where two samples were used: one was a neat cement paste prepared by the water-to-cement ratio (w/cm) of 0.40 and the other having the same w/cm incorporated a HRWRA (0.04% dosage per cement mass).
A commercially available HRWRA (0.06% dosage per cement mass) was applied.
Therefore, the operator could determine the necessity of adding more water or HRWRA to obtain the workability desired.
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- Hryniewiecki, Jerzy