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For a saturated cohesive soil, a triaxial test yields the angle of internal friction (φ) as zero. The conducted test is

1. Consolidated Drained (CD) test
2. Consolidated Undrained (CU) test
3. Unconfined Compression (UC) test
4. Unconsolidated Undrained (UU) test

Correct answer: Unconsolidated Undrained (UU) test

Solution

The Unconsolidated Undrained (UU) test is designed to evaluate the strength of saturated cohesive soils without allowing drainage, which means pore water pressures can affect the results. In this case, a zero angle of internal friction indicates that the soil behaves as a purely cohesive material under undrained conditions, characteristic of the UU test.

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