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A saturated clay sample has a specific gravity of 2.72, an initial height of 2 cm,...

A saturated clay sample has a specific gravity of 2.72, an initial height of 2 cm, a cross-section area of 30 cm2. After a consolidation test, its mass becomes 109.44g, and the mass after oven-drying is 88.44g. What is the change of its void ratio after the consolidation test compared with that before the test?

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