How much should the height of drop of the liquid limit cup be adjusted to?

The correct adjustment for the height of drop of the liquid limit cup is specified to be 10.0 ± 0.2 mm. This measurement is crucial for ensuring consistency and accuracy in testing the properties of soil and aggregates in the liquid limit test. The precise height allows for standardization across tests, which is critical for comparing results and ensuring that the behavior of materials under similar conditions is accurately represented.

In the liquid limit test, the purpose of adjusting the drop height to this specific range is to control the energy applied to the sample during the test. When the height of the drop is set correctly, it ensures that the soil is subjected to a consistent amount of mechanical energy, which affects the soil's behavior and assists in determining its consistency limits.

Ensuring the drop height is at the specified range also aids in replicating test results across different labs and testing scenarios. Variations from the set height could lead to inconsistent results, making it difficult to compare tests accurately or evaluate the material effectively. Hence, adhering to the standard of 10.0 ± 0.2 mm is essential for maintaining the integrity of the testing process.