How should coarse aggregate trapped in a sieve be removed?

• A. By shaking the sieve vigorously
• B. By gently removing the sieve opening with both hands
• C. By using a mechanical pump
• D. By immersing the sieve in water

Answer: (B)

The most appropriate method for removing coarse aggregate trapped in a sieve is to gently remove the aggregate by holding the sieve with both hands. This approach minimizes the risk of damaging the sieve or losing accurate results from the test being conducted. It allows for careful handling of both the sieve and the aggregate, ensuring that they remain intact and that the material is properly collected without additional disruption.

Using a gentle motion helps avoid shaking the sieve too vigorously, which could lead to additional wear or breakage. Similarly, methods that involve mechanical pumps or immersing the sieve in water may not be suitable as they could alter the characteristics of the aggregate or the sieve itself. Proper handling is essential for maintaining the integrity of the testing process and ensuring the accuracy of the results.