What is the term for a sieve that has several layers of particles that obstruct access to the sieve opening?

The correct term for a sieve that has several layers of particles obstructing access to the sieve opening is "overload." When a sieve is overloaded, it means that too much material has been placed onto it, resulting in an accumulation of particles that can hinder the flow of additional material. This buildup can prevent efficient segregation of particle sizes, as the larger particles may not be able to pass through the sieve effectively.

This term is commonly used in the context of sieving processes, where the goal is to separate materials based on size. An overload condition can lead to improper results in tests that rely on the accurate sizing of aggregates. Understanding the concept of overload is essential for any technician involved in aggregate testing, as it directly impacts the reliability of the results obtained from the sieving process.