What pattern should be followed when taking samples from a dumped pile?

Taking samples from a dumped pile using an X pattern with sufficient increments is a method that ensures a representative sample is obtained. This technique involves sampling at various points across the entire pile, which helps to mitigate any variations in material composition that may occur due to segregation or other factors within the pile.

The X pattern is particularly effective for aggregate because it ensures that both surface and interior materials are included in the sample, capturing any differences in gradation and moisture content that might be present. By following this systematic approach, the technician can achieve a more accurate reflection of the entire pile’s characteristics, which is crucial for quality control and compliance with specifications.

Utilizing an X pattern as opposed to other methods, such as a circular pattern or strictly linear approach, reduces the chances of sampling bias that may arise from following a less systematic route. Random grabs from different sections may not account for the necessary increments needed for a uniform sample, which can lead to inconsistent results and affect the integrity of the mixture being tested.