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روندگی آزاد و بدون ارتعاش
We see that the free flow is significantly influenced by the q-value, lower q-value gives higher free flow.
These results are in accordance with earlier data stating that high free flow is attained by the use of particle size distributions with low q-value.
A full listing of the castable composition is given in reference.24 Additional to the fact that low q-values improve free flow, also the time it takes until the free flow start to decline is proportional to the microsilica content.
Here the effect is that a castable with a q-value of 0.25 (8% microsilica) makes it possible to maintain free flow for around 3 hours whereas a q-value of 0.28 (4.5% microsilica) .leaves little time until the flow decay commences.
Figure 5: Free flow as a function of time and particle size distribution at 20°C.
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