Discussion
Consider the following statements about slip and slop control.
1. Specific gravity is checked with a hydrometer.
2. Adding water lowers the specific gravity.
3. Adding deflocculant raises the specific gravity.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: specific gravity is read with a hydrometer or from a weighed measure, and adding water lowers it. Statement 3 is wrong - a deflocculant lowers the *viscosity* at a given solids content and leaves the specific gravity essentially unchanged, since it is added in fractions of a per cent. Confusing the two is why a slip is sometimes thinned with water when it needed deflocculant instead.
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