What should be done every 25 strikes during the adequacy check?

During the adequacy check, rotating the sieve 1/6 of a revolution every 25 strikes is essential because it ensures that the material is evenly distributed and that all particles have the opportunity to pass through the openings in the sieve. This practice helps maintain consistency in the testing process by minimizing the likelihood of bias that could occur if the material were allowed to settle uniformly in one position.

In testing scenarios, particularly when assessing the gradation of aggregates or soils, even distribution is critical for accurate measurement of particle sizes and for determining compliance with specifications. By rotating the sieve periodically, the inspector promotes a thorough evaluation of the sample, ensuring that the test results reflect the true characteristics of the material being tested.

Other practices, like weighing the pan or changing the sieve, are not performed every 25 strikes, and testing the material is a broader step that occurs at different stages of the testing process. Each action has its specific timing and relevance in the quality assurance process, but the rotation of the sieve is aimed directly at maintaining the integrity of the current testing cycle.